Release 1.13.0 "Externality"

Changes:

- A system for latching and locking views
- Some crash fixes
- Locale-flavored terminals
- A way to add locale-flavored emoji and numbers layouts
- Making the code less annoying to work with in some places
- Fixed layout changes on newer GSettings
- Mod4 modifier
- Better session registration
- New layouts: Dvorak, Colemak wide, hebrew, wide Thai

Cargo.lock

@@ -59,9 +59,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.66"
+version = "1.0.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c0496836a84f8d0495758516b8621a622beb77c0fed418570e50764093ced48"
+checksum = "e3c69b077ad434294d3ce9f1f6143a2a4b89a8a2d54ef813d85003a4fd1137fd"
 
 [[package]]
 name = "clap"
@@ -76,9 +76,9 @@ dependencies = [
 
 [[package]]
 name = "dtoa"
-version = "0.4.7"
+version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88d7ed2934d741c6b37e33e3832298e8850b53fd2d2bea03873375596c7cea4e"
+checksum = "56899898ce76aaf4a0f24d914c97ea6ed976d42fec6ad33fcbb0a1103e07b2b0"
 
 [[package]]
 name = "fragile"
@@ -265,9 +265,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.82"
+version = "0.2.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89203f3fba0a3795506acaad8ebce3c80c0af93f994d5a1d7a0b1eeb23271929"
+checksum = "9385f66bf6105b241aa65a61cb923ef20efc665cb9f9bb50ac2f0c4b7f378d41"
 
 [[package]]
 name = "linked-hash-map"
@@ -326,18 +326,18 @@ checksum = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.24"
+version = "1.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+checksum = "a152013215dca273577e18d2bf00fa862b89b24169fb78c4c95aeb07992c9cec"
 dependencies = [
  "unicode-xid",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.8"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "991431c3519a3f36861882da93630ce66b52918dcf1b8e2fd66b397fc96f28df"
+checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
 dependencies = [
  "proc-macro2",
 ]
@@ -353,9 +353,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.22"
+version = "0.6.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5eb417147ba9860a96cfe72a0b93bf88fee1744b5636ec99ab20c1aa9376581"
+checksum = "24d5f089152e60f62d28b835fbff2cd2e8dc0baf1ac13343bef92ab7eed84548"
 
 [[package]]
 name = "rs"
@@ -380,18 +380,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.118"
+version = "1.0.125"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06c64263859d87aa2eb554587e2d23183398d617427327cf2b3d0ed8c69e4800"
+checksum = "558dc50e1a5a5fa7112ca2ce4effcb321b0300c0d4ccf0776a9f60cd89031171"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.118"
+version = "1.0.125"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c84d3526699cd55261af4b941e4e725444df67aa4f9e6a3564f18030d12672df"
+checksum = "b093b7a2bb58203b5da3056c05b4ec1fed827dcfdb37347a8841695263b3d06d"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -400,9 +400,9 @@ dependencies = [
 
 [[package]]
 name = "serde_yaml"
-version = "0.8.15"
+version = "0.8.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "971be8f6e4d4a47163b405a3df70d14359186f9ab0f3a3ec37df144ca1ce089f"
+checksum = "15654ed4ab61726bf918a39cb8d98a2e2995b002387807fa6ba58fdf7f59bb23"
 dependencies = [
  "dtoa",
  "linked-hash-map",
@@ -412,9 +412,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.58"
+version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc60a3d73ea6594cd712d830cc1f0390fd71542d8c8cd24e70cc54cdfd5e05d5"
+checksum = "48fe99c6bd8b1cc636890bcc071842de909d902c81ac7dab53ba33c421ab8ffb"
 dependencies = [
  "proc-macro2",
  "quote",

data/keyboards/es+cat.yaml

@@ -0,0 +1,87 @@
+---
+outlines:
+    default: { width: 35.33, height: 52 }
+    altline: { width: 52.67, height: 52 }
+    wide: { width: 62, height: 52 }
+    spaceline: { width: 99.67, height: 52 }
+    special: { width: 44, height: 52 }
+
+views:
+    base:
+        - "q w e r t y u i o p"
+        - "a s d f g h j k l ç"
+        - "Shift_L   z x c v b n m  BackSpace"
+        - "show_numbers show_eschars preferences         space        ? period Return"
+    upper:
+        - "Q W E R T Y U I O P"
+        - "A S D F G H J K L Ç"
+        - "Shift_L   Z X C V B N M  BackSpace"
+        - "show_numbers show_eschars preferences         space        ¿ period Return"
+    numbers:
+        - "1 2 3 4 5 6 7 8 9 0"
+        - "@ # € % & - _ + ( )"
+        - "show_symbols   , \" ' colon ; ! = BackSpace"
+        - "show_letters show_eschars preferences         space        ? period Return"
+    symbols:
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "© ® £ $ ¥ ^ ° * { }"
+        - "show_numbers   \\ / < > = [ ]  BackSpace"
+        - "show_letters show_eschars preferences         space        ? period Return"
+    eschars:
+        - "á é í ó ú Á É Í Ó Ú"
+        - "à è ì ò ù À È Ì Ò Ù"
+        - "show_numbers ü ç ï Ü Ç Ï ¡  BackSpace"
+        - "show_letters show_eschars preferences         space        « » Return"
+
+buttons:
+    Shift_L:
+        action:
+            locking:
+                lock_view: "upper"
+                unlock_view: "base"
+        outline: "altline"
+        icon: "key-shift"
+    BackSpace:
+        outline: "altline"
+        icon: "edit-clear-symbolic"
+        action: "erase"
+    preferences:
+        action: "show_prefs"
+        outline: "default"
+        icon: "keyboard-mode-symbolic"
+    show_numbers:
+        action:
+            set_view: "numbers"
+        outline: "altline"
+        label: "123"
+    show_letters:
+        action:
+            set_view: "base"
+        outline: "altline"
+        label: "abc"
+    show_symbols:
+        action:
+            set_view: "symbols"
+        outline: "altline"
+        label: "*/="
+    show_eschars:
+        action:
+            locking:
+                lock_view: "eschars"
+                unlock_view: "base"
+        outline: "altline"
+        label: "àÀ"
+
+    period:
+        outline: "default"
+        text: "."
+    space:
+        outline: "spaceline"
+        text: " "
+    Return:
+        outline: "altline"
+        icon: "key-enter"
+        keysym: "Return"
+    colon:
+        text: ":"
+

data/keyboards/il.yaml

@@ -0,0 +1,71 @@
+---
+outlines:
+    default: { width: 40, height: 60 }
+    altline: { width: 56, height: 60 }
+    wide: { width: 62, height: 60 }
+    spaceline: { width: 142, height: 60 }
+    special: { width: 44, height: 60 }
+
+views:
+    base:
+        - "' - ק  ר א ט ו ן ם פ"
+        - "ש ד ג כ ע י ח ל ך ף"
+        - "ז ס ב ה נ מ צ ת ץ  BackSpace"
+        - "show_numbers comma preferences         space        period Return"
+    numbers:
+        - "1 2 3 4 5 6 7 8 9 0"
+        - "@ # ₪ % & - _ + ( )"
+        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
+        - "show_letters preferences         space        period Return"
+    symbols:
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "© ® £ € $ ^ ° * { }"
+        - "show_numbers_from_symbols   \\ / < > = [ ]  BackSpace"
+        - "show_letters preferences         space        period Return"
+
+buttons:
+    BackSpace:
+        outline: "default"
+        icon: "edit-clear-symbolic"
+        action: erase
+    comma:
+        outline: "special"
+        text: ","
+        
+    preferences:
+        action: show_prefs
+        outline: "special"
+        icon: "keyboard-mode-symbolic"
+    show_numbers:
+        action:
+            set_view: "numbers"
+        outline: "wide"
+        label: "123"
+    show_numbers_from_symbols:
+        action:
+            set_view: "numbers"
+        outline: "altline"
+        label: "123"
+    show_letters:
+        action:
+            set_view: "base"
+        outline: "wide"
+        label: "ABC"
+    show_symbols:
+        action:
+            set_view: "symbols"
+        outline: "altline"
+        label: "*/="
+    period:
+        outline: "special"
+        text: "."
+    space:
+        outline: "spaceline"
+        text: " "
+    Return:
+        outline: "wide"
+        icon: "key-enter"
+        keysym: "Return"
+    colon:
+        text: ":"
+

data/keyboards/it+fur.yaml

@@ -22,7 +22,7 @@ views:
     numbers:
         - "1 2 3 4 5 6 7 8 9 0"
         - "@ # € % & - _ + ( )"
-        - "show_symbols   , \" ' colon ; ! =  BackSpace"
+        - "show_symbols   , \" ' : ; ! =  BackSpace"
         - "show_letters show_eschars preferences         space        ? . Return"
     symbols:
         - "~ ` | · √ π τ ÷ × ¶"
@@ -86,7 +86,4 @@ buttons:
         outline: "altline"
         icon: "key-enter"
         keysym: "Return"
-    colon:
+
-        label: ":"
-    "\"":
-        keysym: "quotedbl"

data/keyboards/it.yaml

@@ -22,7 +22,7 @@ views:
     numbers:
         - "1 2 3 4 5 6 7 8 9 0"
         - "@ # € % & - _ + ( )"
-        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
+        - "show_symbols   , \" ' : ; ! ?  BackSpace"
         - "show_letters show_eschars preferences         space        ? . Return"
     symbols:
         - "~ ` | · √ π τ ÷ × ¶"
@@ -84,7 +84,4 @@ buttons:
         outline: "altline"
         icon: "key-enter"
         keysym: "Return"
-    colon:
+
-        label: ":"
-    "\"":
-        keysym: "quotedbl"

data/keyboards/pl.yaml

@@ -52,6 +52,8 @@ buttons:
             locking:
                 lock_view: "upper_accents"
                 unlock_view: "accents"
+                looks_locked_from:
+                    - "upper"
         outline: "altline"
         icon: "key-shift"
     BackSpace:
@@ -94,6 +96,8 @@ buttons:
             locking:
                 lock_view: "upper_accents"
                 unlock_view: "upper"
+                looks_locked_from:
+                    - "accents"
         outline: "altline"
         label: "ĄĘ"
     period:

data/keyboards/terminal/fr.yaml

@@ -0,0 +1,220 @@
+---
+outlines:
+    action:    { width: 59,    height: 46 }
+    small:     { width: 50,    height: 22 }
+    default:   { width: 35.33, height: 46 }
+    altline:   { width: 48,    height: 46 }
+    wide:      { width: 50,    height: 46 }
+    spaceline: { width: 110,   height: 46 }
+    special:   { width: 44,    height: 46 }
+
+views:
+    base:
+        - "Ctrl Alt Tabsmall ↑ ↓ ← →"
+        - "a z e r t y u i o p"
+        - "q s d f g h j k l m"
+        - "Shift_L   w x c v b n period   BackSpace"
+        - "show_numbers preferences         space        show_eschars show_actions Return"
+    upper:
+        - "Ctrl Alt Tabsmall PgUp PgDn Home End"
+        - "A Z E R T Y U I O P"
+        - "Q S D F G H J K L M"
+        - "Shift_L   W X C V B N ,  BackSpace"
+        - "show_numbers preferences         space        show_eschars show_actions Return"
+    numbers:
+        - "Ctrl Alt Tabsmall ↑ ↓ ← →"
+        - "1 2 3 4 5 6 7 8 9 0"
+        - "@ # € % & - _ + ( )"
+        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
+        - "show_letters preferences         space        show_eschars show_actions Return"
+    symbols:
+        - "Ctrl Alt Tabsmall ↑ ↓ ← →"
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "© ® £ $ ¥ ^ ° * { }"
+        - "show_numbers_from_symbols   \\ / < > = [ ]  BackSpace"
+        - "show_letters preferences         space        show_eschars show_actions Return"
+    eschars:
+        - "Ctrl Alt Tabsmall ↑ ↓ ← →"
+        - "à â ç é è ê î ô ù û"
+        - "À Â Ç É È Ê Î Ô Ù Û"
+        - "show_numbers_from_symbols  æ œ ä ë ï ö ü  BackSpace"
+        - "show_letters preferences         space        show_eschars show_actions Return"
+    actions:
+        - "Ctrl Alt PgUp PgDn Home End"
+        - "F1  F2  F3  F4  F5  F6"
+        - "F7  F8  F9  F10 F11 F12"
+        - "Esc Tab Pause Insert Up Del"
+        - "show_letters Menu Break Left Down Right"
+
+ 
+buttons:
+    F1:
+        outline: "action"
+        keysym: "F1"
+    F2:
+        outline: "action"
+        keysym: "F2"
+    F3:
+        outline: "action"
+        keysym: "F3"
+    F4:
+        outline: "action"
+        keysym: "F4"
+    F5:
+        outline: "action"
+        keysym: "F5"
+    F6:
+        outline: "action"
+        keysym: "F6"
+    F7:
+        outline: "action"
+        keysym: "F7"
+    F8:
+        outline: "action"
+        keysym: "F8"
+    F9:
+        outline: "action"
+        keysym: "F9"
+    F10:
+        outline: "action"
+        keysym: "F10"
+    F11:
+        outline: "action"
+        keysym: "F11"
+    F12:
+        outline: "action"
+        keysym: "F12"
+    Esc:
+        outline: "action"
+        keysym: "Escape"
+    Tab:
+        outline: "action"
+        keysym: "Tab"
+    Tabsmall:
+        outline: "small"
+        keysym: "Tab"
+        label: "Tab"
+    Del:
+        outline: "action"
+        keysym: "Delete"
+    Insert:
+        outline: "action"
+        keysym: "Insert"
+    Menu:
+        outline: "action"
+        keysym: "Menu"
+    Pause:
+        outline: "action"
+        keysym: "Pause"
+    Break:
+        outline: "action"
+        keysym: "Break"
+    Home:
+        outline: "small"
+        keysym: "Home"
+    End:
+        outline: "small"
+        keysym: "End"
+    PgUp:
+        outline: "small"
+        keysym: "Page_Up"
+    PgDn:
+        outline: "small"
+        keysym: "Page_Down"
+    "↑":
+        outline: "small"
+        keysym: "Up"
+    "↓":
+        outline: "small"
+        keysym: "Down"
+    "←":
+        outline: "small"
+        keysym: "Left"
+    "→":
+        outline: "small"
+        keysym: "Right"
+    Up:
+        label: "↑"
+        outline: "action"
+        keysym: "Up"
+    Left:
+        label: "←"
+        outline: "action"
+        keysym: "Left"
+    Down:
+        label: "↓"
+        outline: "action"
+        keysym: "Down"
+    Right:
+        label: "→"
+        outline: "action"
+        keysym: "Right"
+    Ctrl:
+        modifier: "Control"
+        outline: "small"
+        label: "Ctrl"
+    Alt:
+        modifier: "Alt"
+        outline: "small"
+        label: "Alt"
+    period:
+        outline: "special"
+        text: "."
+    show_actions:
+        action:
+            set_view: "actions"
+        outline: "special"
+        label: ">_"
+    Shift_L:
+        action:
+            locking:
+                lock_view: "upper"
+                unlock_view: "base"
+        outline: "altline"
+        icon: "key-shift"
+    BackSpace:
+        outline: "altline"
+        icon: "edit-clear-symbolic"
+        action: erase
+    preferences:
+        action: "show_prefs"
+        outline: "special"
+        icon: "keyboard-mode-symbolic"
+    show_numbers:
+        action:
+            set_view: "numbers"
+        outline: "wide"
+        label: "123"
+    show_numbers_from_symbols:
+        action:
+            set_view: "numbers"
+        outline: "altline"
+        label: "123"
+    show_letters:
+        action:
+            set_view: "base"
+        outline: "wide"
+        label: "abc"
+    show_symbols:
+        action:
+            set_view: "symbols"
+        outline: "altline"
+        label: "*/="
+    show_eschars:
+        action:
+            locking:
+                lock_view: "eschars"
+                unlock_view: "base"
+        outline: "altline"
+        label: "âÂ"
+    space:
+        outline: "spaceline"
+        text: " "
+    Return:
+        outline: "wide"
+        icon: "key-enter"
+        keysym: "Return"
+    colon:
+        text: ":"
+    "\"":
+        keysym: "quotedbl"

data/keyboards/terminal/fr_wide.yaml

@@ -0,0 +1,223 @@
+---
+outlines:
+    action:    { width: 90,   height: 37 }
+    small:     { width: 67.4, height: 22 }
+    default:   { width: 54,  height: 37 }
+    altline:   { width: 81,  height: 37 }
+    wide:      { width: 100, height: 37 }
+    spaceline: { width: 110, height: 37 }
+    special:   { width: 54,  height: 37 }
+
+views:
+    base:
+        - "EscSmall TabSmall Ctrl Alt ↑ ↓ ← →"
+        - "a z e r t y u i o p"
+        - "q s d f g h j k l m"
+        - "Shift_L   w x c v b n period   BackSpace"
+        - "show_numbers preferences         space        show_eschars show_actions Return"
+    upper:
+        - "EscSmall TabSmall Ctrl Alt PgUp PgDn Home End"
+        - "A Z E R T Y U I O P"
+        - "Q S D F G H J K L M"
+        - "Shift_L   W X C V B N ,  BackSpace"
+        - "show_numbers preferences         space        show_eschars show_actions Return"
+    numbers:
+        - "EscSmall TabSmall Ctrl Alt ↑ ↓ ← →"
+        - "1 2 3 4 5 6 7 8 9 0"
+        - "@ # € % & - _ + ( )"
+        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
+        - "show_letters preferences         space        show_eschars show_actions Return"
+    symbols:
+        - "EscSmall TabSmall Ctrl Alt ↑ ↓ ← →"
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "© ® £ $ ¥ ^ ° * { }"
+        - "show_numbers_from_symbols   \\ / < > = [ ]  BackSpace"
+        - "show_letters preferences         space        show_eschars show_actions Return"
+    eschars:
+        - "EscSmall TabSmall Ctrl Alt ↑ ↓ ← →"
+        - "à â ç é è ê î ô ù û"
+        - "À Â Ç É È Ê Î Ô Ù Û"
+        - "show_numbers_from_symbols  æ œ ä ë ï ö ü  BackSpace"
+        - "show_letters preferences         space        show_eschars show_actions Return"
+    actions:
+        - "EscSmall TabSmall Ctrl Alt PgUp PgDn Home End"
+        - "F1  F2  F3  F4  F5  F6"
+        - "F7  F8  F9  F10 F11 F12"
+        - "Esc Tab Pause Insert Up Del"
+        - "show_letters Menu Break Left Down Right"
+ 
+buttons:
+    F1:
+        outline: "action"
+        keysym: "F1"
+    F2:
+        outline: "action"
+        keysym: "F2"
+    F3:
+        outline: "action"
+        keysym: "F3"
+    F4:
+        outline: "action"
+        keysym: "F4"
+    F5:
+        outline: "action"
+        keysym: "F5"
+    F6:
+        outline: "action"
+        keysym: "F6"
+    F7:
+        outline: "action"
+        keysym: "F7"
+    F8:
+        outline: "action"
+        keysym: "F8"
+    F9:
+        outline: "action"
+        keysym: "F9"
+    F10:
+        outline: "action"
+        keysym: "F10"
+    F11:
+        outline: "action"
+        keysym: "F11"
+    F12:
+        outline: "action"
+        keysym: "F12"
+    Esc:
+        outline: "action"
+        keysym: "Escape"
+    EscSmall:
+        outline: "small"
+        keysym: "Escape"
+        label: "Esc"
+    Tab:
+        outline: "action"
+        keysym: "Tab"
+    TabSmall:
+        outline: "small"
+        keysym: "Tab"
+        label: "Tab"
+    Del:
+        outline: "action"
+        keysym: "Delete"
+    Insert:
+        outline: "action"
+        keysym: "Insert"
+    Menu:
+        outline: "action"
+        keysym: "Menu"
+    Pause:
+        outline: "action"
+        keysym: "Pause"
+    Break:
+        outline: "action"
+        keysym: "Break"
+    Home:
+        outline: "small"
+        keysym: "Home"
+    End:
+        outline: "small"
+        keysym: "End"
+    PgUp:
+        outline: "small"
+        keysym: "Page_Up"
+    PgDn:
+        outline: "small"
+        keysym: "Page_Down"
+    "↑":
+        outline: "small"
+        keysym: "Up"
+    "↓":
+        outline: "small"
+        keysym: "Down"
+    "←":
+        outline: "small"
+        keysym: "Left"
+    "→":
+        outline: "small"
+        keysym: "Right"
+    Up:
+        label: "↑"
+        outline: "action"
+        keysym: "Up"
+    Left:
+        label: "←"
+        outline: "action"
+        keysym: "Left"
+    Down:
+        label: "↓"
+        outline: "action"
+        keysym: "Down"
+    Right:
+        label: "→"
+        outline: "action"
+        keysym: "Right"
+    Ctrl:
+        modifier: "Control"
+        outline: "small"
+        label: "Ctrl"
+    Alt:
+        modifier: "Alt"
+        outline: "small"
+        label: "Alt"
+    period:
+        outline: "special"
+        text: "."
+    show_actions:
+        action:
+            set_view: "actions"
+        outline: "special"
+        label: ">_"
+    Shift_L:
+        action:
+            locking:
+                lock_view: "upper"
+                unlock_view: "base"
+        outline: "altline"
+        icon: "key-shift"
+    BackSpace:
+        outline: "altline"
+        icon: "edit-clear-symbolic"
+        action: erase
+    preferences:
+        action: "show_prefs"
+        outline: "special"
+        icon: "keyboard-mode-symbolic"
+    show_numbers:
+        action:
+            set_view: "numbers"
+        outline: "wide"
+        label: "123"
+    show_numbers_from_symbols:
+        action:
+            set_view: "numbers"
+        outline: "altline"
+        label: "123"
+    show_letters:
+        action:
+            set_view: "base"
+        outline: "wide"
+        label: "abc"
+    show_symbols:
+        action:
+            set_view: "symbols"
+        outline: "altline"
+        label: "*/="
+    show_eschars:
+        action:
+            locking:
+                lock_view: "eschars"
+                unlock_view: "base"
+        outline: "altline"
+        label: "âÂ"
+    space:
+        outline: "spaceline"
+        text: " "
+    Return:
+        outline: "wide"
+        icon: "key-enter"
+        keysym: "Return"
+    colon:
+        text: ":"
+    "\"":
+        keysym: "quotedbl"

data/keyboards/terminal/us.yaml

@@ -147,9 +147,6 @@ buttons:
     Pause:
         outline: "action"
         keysym: "Pause"
-    Menu:
-        outline: "action"
-        keysym: "Menu"
     Break:
         outline: "action"
         keysym: "Break"
@@ -201,4 +198,3 @@ buttons:
         modifier: "Alt"
         outline: "small"
         label: "Alt"
-

data/keyboards/terminal/us_wide.yaml

@@ -155,9 +155,6 @@ buttons:
     Pause:
         outline: "action"
         keysym: "Pause"
-    Menu:
-        outline: "action"
-        keysym: "Menu"
     Break:
         outline: "action"
         keysym: "Break"

data/keyboards/th_wide.yaml

@@ -0,0 +1,84 @@
+---
+outlines:
+    default: { width: 75, height: 56 }
+    altline: { width: 75, height: 56 }
+    wide: { width: 135, height: 56 }
+    spaceline: { width: 450, height: 56 }
+    spacelinesymbol: { width: 300, height: 56 }
+    special: { width: 90, height: 56 }
+
+views:
+    base:
+        - "ๅ / _ ภ ถ ุ ึ ค ต จ ข ช"
+        - "ๆ ไ ำ พ ะ ั ี ร น ย บ ล"
+        - "ฟ ห ก ด เ ้ ่ า ส ว ง ฃ"
+        - "Shift_L   ผ ป แ อ ิ ื ท ม ใ ฝ   BackSpace"
+        - "show_numbers preferences         space        period Return"
+    upper:
+        - "+ ๑ ๒ ๓ ๔ ู ฿ ๕ ๖ ๗ ๘ ๙"
+        - "๐ \" ฎ ฑ ธ ํ ๊ ณ ฯ ญ ฐ ,"
+        - "ฤ ฆ ฏ โ ฌ ็ ๋ ษ ศ ซ . ฅ"
+        - "Shift_L   ( ) ฉ ฮ ฺ ์ ? ฒ ฬ ฦ  BackSpace"
+        - "show_numbers preferences         space        period Return"
+    numbers:
+        - "1 2 3 4 5 6 7 8 9 0"
+        - "@ # $ % & - _ + ( )"
+        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
+        - "show_letters preferences         spacesymbol        period Return"
+    symbols:
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "© ® £ € ¥ ^ ° * { }"
+        - "show_numbers_from_symbols   \\ / < > = [ ]  BackSpace"
+        - "show_letters preferences         spacesymbol        period Return"
+
+buttons:
+    Shift_L:
+        action:
+            locking:
+                lock_view: "upper"
+                unlock_view: "base"
+        outline: "altline"
+        icon: "key-shift"
+    BackSpace:
+        outline: "altline"
+        icon: "edit-clear-symbolic"
+        action: erase
+    preferences:
+        action: show_prefs
+        outline: "special"
+        icon: "keyboard-mode-symbolic"
+    show_numbers:
+        action:
+            set_view: "numbers"
+        outline: "wide"
+        label: "123"
+    show_numbers_from_symbols:
+        action:
+            set_view: "numbers"
+        outline: "altline"
+        label: "123"
+    show_letters:
+        action:
+            set_view: "base"
+        outline: "wide"
+        label: "กขค"
+    show_symbols:
+        action:
+            set_view: "symbols"
+        outline: "altline"
+        label: "*/="
+    period:
+        outline: "special"
+        text: "."
+    space:
+        outline: "spaceline"
+        text: " "
+    spacesymbol:
+        outline: "spacelinesymbol"
+        text: " "
+    Return:
+        outline: "wide"
+        icon: "key-enter"
+        keysym: "Return"
+    colon:
+        text: ":"

data/keyboards/us+colemak_wide.yaml

@@ -0,0 +1,78 @@
+---
+outlines:
+    default: { width: 54, height: 42 }
+    altline: { width: 81, height: 42 }
+    wide: { width: 108, height: 42 }
+    spaceline: { width: 216, height: 42 }
+    special: { width: 54, height: 42 }
+
+views:
+    base:
+        - "q w f p g j l u y"
+        - "a r s t d h n e i o"
+        - "Shift_L   z x c v b k m  BackSpace"
+        - "show_numbers preferences         space        . Return"
+    upper:
+        - "Q W F P G J L U Y"
+        - "A R S T D H N E I O"
+        - "Shift_L   Z X C V B K M  BackSpace"
+        - "show_numbers preferences         space        . Return"
+    numbers:
+        - "1 2 3 4 5 6 7 8 9 0"
+        - "@ # $ % & - _ + ( )"
+        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
+        - "show_letters preferences         space        . Return"
+    symbols:
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "© ® £ € ¥ ^ ° * { }"
+        - "show_numbers_from_symbols   \\ / < > = [ ]  BackSpace"
+        - "show_letters preferences         space        . Return"
+
+buttons:
+    Shift_L:
+        action:
+            locking:
+                lock_view: "upper"
+                unlock_view: "base"
+        outline: "altline"
+        icon: "key-shift"
+    BackSpace:
+        outline: "altline"
+        icon: "edit-clear-symbolic"
+        action: "erase"
+    preferences:
+        action: "show_prefs"
+        outline: "special"
+        icon: "keyboard-mode-symbolic"
+    show_numbers:
+        action:
+            set_view: "numbers"
+        outline: "wide"
+        label: "123"
+    show_numbers_from_symbols:
+        action:
+            set_view: "numbers"
+        outline: "altline"
+        label: "123"
+    show_letters:
+        action:
+            set_view: "base"
+        outline: "wide"
+        label: "ABC"
+    show_symbols:
+        action:
+            set_view: "symbols"
+        outline: "altline"
+        label: "*/="
+    ".":
+        outline: "special"
+        text: "."
+    space:
+        outline: "spaceline"
+        text: " "
+    Return:
+        outline: "wide"
+        icon: "key-enter"
+        keysym: "Return"
+    colon:
+        text: ":"

data/keyboards/us+dvorak.yaml

@@ -0,0 +1,89 @@
+---
+outlines:
+    default: { width: 35.33, height: 52 }
+    altline: { width: 52.67, height: 52 }
+    wide: { width: 62, height: 52 }
+    spaceline: { width: 142, height: 52 }
+    special: { width: 44, height: 52 }
+
+views:
+    base:
+        - "Shift_L   p y f g c r l  BackSpace"
+        - "a o e u i d h t n s"
+        - ", q j k x b m w v z"
+        - "show_numbers preferences         space        period Return"
+    upper:
+        - "Shift_L   P Y F G C R L  BackSpace"
+        - "A O E U I D H T N S"
+        - ", Q J K X B M W V Z"
+        - "show_numbers preferences         space        period Return"
+    numbers:
+        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
+        - "* # $ / & - _ + ( )"
+        - "1 2 3 4 5 6 7 8 9 0"
+        - "show_letters preferences         space        period Return"
+    symbols:
+        - "show_numbers_from_symbols   \\ % < > = [ ]  BackSpace"
+        - "© ® £ € ¥ ^ ° @ { }"
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "show_letters preferences         space        period Return"
+
+buttons:
+    Shift_L:
+        action:
+            locking:
+                lock_view: "upper"
+                unlock_view: "base"
+        outline: "altline"
+        icon: "key-shift"
+    BackSpace:
+        outline: "altline"
+        icon: "edit-clear-symbolic"
+        action: "erase"
+    preferences:
+        action: "show_prefs"
+        outline: "special"
+        icon: "keyboard-mode-symbolic"
+    show_numbers:
+        action:
+            set_view: "numbers"
+        outline: "wide"
+        label: "123"
+    show_numbers_from_symbols:
+        action:
+            set_view: "numbers"
+        outline: "altline"
+        label: "123"
+    show_letters:
+        action:
+            set_view: "base"
+        outline: "wide"
+        label: "ABC"
+    show_symbols:
+        action:
+            set_view: "symbols"
+        outline: "altline"
+        label: "*/="
+    period:
+        outline: "special"
+        text: "."
+    space:
+        outline: "spaceline"
+        text: " "
+    Return:
+        outline: "wide"
+        icon: "key-enter"
+        keysym: "Return"
+    colon:
+        text: ":"
+
+# The US QWERTY layout has fewer letters on the third row, and so has
+# the shift & backspace keys placed there. In contrast, the US DVORAK
+# layout has fewer letters on the first row, which makes it a good
+# choice for the shift & backspace keys. That leads to what may be,
+# for many people, an unexpected layout in numbers mode: the numerals
+# are on the third row (not the first) so that the backspace key
+# remains in a consistent location regardless of mode, without
+# sacrificing key width. (Once could argue that in numbers mode, the
+# numerals should be closer to the enter key.) As with any keyboard
+# layout, familiarity comes with repeated use.

data/keyboards/us+dvorak_wide.yaml

@@ -0,0 +1,89 @@
+---
+outlines:
+    default: { width: 54, height: 42 }
+    altline: { width: 81, height: 42 }
+    wide: { width: 108, height: 42 }
+    spaceline: { width: 216, height: 42 }
+    special: { width: 54, height: 42 }
+
+views:
+    base:
+        - "Shift_L   p y f g c r l  BackSpace"
+        - "a o e u i d h t n s"
+        - ", q j k x b m w v z"
+        - "show_numbers preferences         space        period Return"
+    upper:
+        - "Shift_L   P Y F G C R L  BackSpace"
+        - "A O E U I D H T N S"
+        - ", Q J K X B M W V Z"
+        - "show_numbers preferences         space        period Return"
+    numbers:
+        - "show_symbols   , \" ' colon ; ! ?  BackSpace"
+        - "* # $ / & - _ + ( )"
+        - "1 2 3 4 5 6 7 8 9 0"
+        - "show_letters preferences         space        period Return"
+    symbols:
+        - "show_numbers_from_symbols   \\ % < > = [ ]  BackSpace"
+        - "© ® £ € ¥ ^ ° @ { }"
+        - "~ ` | · √ π τ ÷ × ¶"
+        - "show_letters preferences         space        period Return"
+
+buttons:
+    Shift_L:
+        action:
+            locking:
+                lock_view: "upper"
+                unlock_view: "base"
+        outline: "altline"
+        icon: "key-shift"
+    BackSpace:
+        outline: "altline"
+        icon: "edit-clear-symbolic"
+        action: "erase"
+    preferences:
+        action: "show_prefs"
+        outline: "special"
+        icon: "keyboard-mode-symbolic"
+    show_numbers:
+        action:
+            set_view: "numbers"
+        outline: "wide"
+        label: "123"
+    show_numbers_from_symbols:
+        action:
+            set_view: "numbers"
+        outline: "altline"
+        label: "123"
+    show_letters:
+        action:
+            set_view: "base"
+        outline: "wide"
+        label: "ABC"
+    show_symbols:
+        action:
+            set_view: "symbols"
+        outline: "altline"
+        label: "*/="
+    period:
+        outline: "special"
+        text: "."
+    space:
+        outline: "spaceline"
+        text: " "
+    Return:
+        outline: "wide"
+        icon: "key-enter"
+        keysym: "Return"
+    colon:
+        text: ":"
+
+# The US QWERTY layout has fewer letters on the third row, and so has
+# the shift & backspace keys placed there. In contrast, the US DVORAK
+# layout has fewer letters on the first row, which makes it a good
+# choice for the shift & backspace keys. That leads to what may be,
+# for many people, an unexpected layout in numbers mode: the numerals
+# are on the third row (not the first) so that the backspace key
+# remains in a consistent location regardless of mode, without
+# sacrificing key width. (Once could argue that in numbers mode, the
+# numerals should be closer to the enter key.) As with any keyboard
+# layout, familiarity comes with repeated use.

data/langs/he-IL.txt

@@ -0,0 +1,19 @@
+be בלגית
+br פורטוגזית (ברזיל)
+cz צ'כית
+de גרמנית
+dk דנית
+es ספרדית
+emoji אימוג'י
+fi פינית
+fr צרפתית
+gr יוונית
+il עברית
+it איטלקית
+no נורווגית
+pl פולנית
+ru רוסית
+se שוודית
+terminal טרמינל
+ua אוקראינית
+us אנגלית (ארה"ב)

data/style-Adwaita:dark.css

@@ -31,11 +31,16 @@ sq_button.wide {
     border-color: #3e3a44;
 }
 
-sq_button.locked {
+sq_button.latched {
     background: #ffffff;
     color: #2b292f;
 }
 
+sq_button.locked {
+    background: #ffffff;
+    color: #1c71d8;
+}
+
 sq_button.action {
     font-size: 0.75em;
 }

data/style.css

@@ -34,11 +34,16 @@ sq_button.wide {
     border-color: @borders; /* #3e3a44; */
 }
 
-sq_button.locked {
+sq_button.latched {
     background: @theme_fg_color; /*#ffffff;*/
     color: @theme_bg_color; /*#2b292f;*/
 }
 
+sq_button.locked {
+    background: @theme_fg_color; /*#ffffff;*/
+    color: mix(@theme_selected_bg_color, @theme_bg_color, 0.4); /*#2b292f;*/
+}
+
 sq_button.action {
     font-size: 0.75em;
 }

debian/changelog

@@ -1,3 +1,65 @@
+squeekboard (1.13.0pureos0~amber0) amber-phone; urgency=medium
+
+  [ Dorota Czaplejewicz ]
+  * layout: Latch keys when clicked twice
+  * layout: Add stateless view switching
+  * layout: Plug in stateless view switching
+  * layout: Remove the little abomination of view change promise
+  * view: Ąto-unlatching when multiple latching buttons pressed
+  * renderer: Bring button drawing closer to Rust
+  * ffi: Eliminate squeek_button and squeek_row
+  * imservice: Increment serials on receiving done, not sending commit
+  * input-method: Fix commit/done mixup in protocol text
+  * CI: fix xheck_tag to be compatible with Amber
+  * italian: Fix colon
+  * popover: Fix prematurely deallocated CString
+  * Rust: Remove unnecessary no_mangle statements to silence warnings
+  * renderer: Reduce reliance on knowing the transform
+  * renderer: Split mutable geometry and place it directly in GtkKeyboard
+  * Revert "moved data/langs/he_IL.txt -> data/langs/he-IL.txt to better conform with existing translations."
+  * layout: Make it possible to opt out of latching per-key
+  * renderer: Mark latched buttons differently than locked
+  * appearance: Colour latched/locked according to design
+  * docs: Describe view switching
+  * language-terminal: Place keyboards in a sub-path
+  * layout selection: Fix emoji and number
+  * rust: Fix compiler warnings
+  * layout: Take into account text purpose again
+  * layouts: Make selection testable
+  * layouts: Stop assuming that layout name always changes on switch
+  * Cargo: Version bump
+
+  [ J.D. Laub ]
+  * Add US Dvorak layout (and Colemak wide)
+  *     Add US Dvorak layout (and Colemak wide)
+
+  [ Jordi Masip ]
+  * Catalan keyboard layout
+
+  [ Myth ]
+  * Added hebrew keyboard layout
+
+  [ David96 ]
+  * Add Mod4 (Windows) key
+
+  [ Panawat Wong-klaew ]
+  * Add wide Thai keyboard layout
+
+  [ Guido Günther ]
+  * server-main: Add quit()
+  * server-main: Properly register to gnome-session (Closes: #274)
+
+  [ Kozova1 ]
+  * Added Hebrew translations for most layouts.
+  * moved data/langs/he_IL.txt -> data/langs/he-IL.txt to better conform with existing translations.
+  * Fixed Hebrew layout.
+  * moved data/langs/he_IL.txt -> data/langs/he-IL.txt to better conform with existing translations.
+
+  [ M33 ]
+  * Revert "Update tests/meson.build"
+
+ -- Dorota Czaplejewicz <dorota.czaplejewicz@puri.sm>  Mon, 12 Apr 2021 10:40:32 +0000
+
 squeekboard (1.12.0pureos0~amber0) amber-phone; urgency=medium
 
   [ Dorota Czaplejewicz ]

debian/check_release.py

@@ -5,6 +5,7 @@ Feed it the first changelog line, and then all available tags.
 """
 
 import re, sys
-tag = "v" + re.findall("\\((.*)\\)", input())[0]
+version = re.findall("\\((.*)\\)", input())[0]
+tag = 'v' + re.findall("([0-9]+\\.[0-9]+\\.[0-9]+).*", version)[0]
 if tag not in map(str.strip, sys.stdin.readlines()):
     raise Exception("Changelog's current version doesn't have a tag. Push the tag!")

doc/index.md

@@ -6,6 +6,7 @@ Contents
 
 * [Tutorial](tutorial.md)
 * [Contributing](hacking.md)
+* [Switching views](views.md)
 
 Introduction
 ------------
@@ -21,6 +22,8 @@ Layouts are created using a text-based format, based on YAML.
 
 TODO: Provide a description of the format.
 
+Squeekboard layouts are separated into *views* and use a *room metaphor* to [switch views](views.md).
+
 Contributions
 -------------
 

doc/latching.svg

@@ -0,0 +1,594 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="177.92439mm"
+   height="88.144363mm"
+   viewBox="0 0 177.92439 88.144364"
+   version="1.1"
+   id="svg8"
+   sodipodi:docname="latching.svg"
+   inkscape:version="1.0.1 (3bc2e813f5, 2020-09-07)">
+  <defs
+     id="defs2">
+    <marker
+       style="overflow:visible"
+       id="Arrow1Lend"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Lend"
+       inkscape:isstock="true">
+      <path
+         transform="matrix(-0.8,0,0,-0.8,-10,0)"
+         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1092" />
+    </marker>
+    <marker
+       style="overflow:visible"
+       id="Arrow1Mend"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend"
+       inkscape:isstock="true">
+      <path
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:1"
+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
+         id="path1098" />
+    </marker>
+    <marker
+       style="overflow:visible"
+       id="Arrow2Sstart"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow2Sstart"
+       inkscape:isstock="true">
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+       transform="translate(0,-0.85044703)">
+      <circle
+         style="color:#000000;overflow:visible;fill:#ffffff;stroke:#000000;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
+         id="path1065"
+         cx="83.03434"
+         cy="93.834679"
+         r="7.8844509" />
+      <text
+         xml:space="preserve"
+         id="text833"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:7.9375px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:sans-serif;letter-spacing:0px;word-spacing:0px;white-space:pre;shape-inside:url(#rect835);fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;"
+         transform="translate(-0.16231537,-0.41581583)"><tspan
+           x="80.886719"
+           y="96.225952"><tspan
+             style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:sans-serif;fill:#000000;fill-opacity:1;stroke:none">a</tspan></tspan></text>
+    </g>
+    <g
+       id="g905-3"
+       transform="translate(46.113101,-0.85044703)">
+      <circle
+         style="color:#000000;overflow:visible;fill:#ffffff;stroke:#000000;stroke-width:0.499999;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
+         id="path1065-3"
+         cx="83.557831"
+         cy="93.366959"
+         r="7.8844509" />
+      <text
+         xml:space="preserve"
+         id="text833-0"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:7.9375px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:sans-serif;letter-spacing:0px;word-spacing:0px;white-space:pre;shape-inside:url(#rect835-10);fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;"
+         transform="translate(-0.04189825,-0.41581583)"><tspan
+           x="80.886719"
+           y="96.225952"><tspan>A</tspan></tspan></text>
+    </g>
+    <g
+       id="g905-7"
+       transform="translate(-0.94494048,73.232887)">
+      <text
+         xml:space="preserve"
+         id="text833-6"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:7.9375px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:sans-serif;letter-spacing:0px;word-spacing:0px;white-space:pre;shape-inside:url(#rect835-4);fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;"
+         transform="translate(-0.04189825,-0.41581583)"><tspan
+           x="80.886719"
+           y="96.225952"><tspan>ą</tspan></tspan></text>
+      <rect
+         style="color:#000000;overflow:visible;fill:none;fill-opacity:1;stroke:#000000;stroke-width:0.5;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+         id="rect900-3"
+         width="10.583333"
+         height="13.79613"
+         x="77.863091"
+         y="86.745537"
+         ry="1.937705" />
+    </g>
+    <g
+       id="g905-3-7"
+       transform="translate(49.136911,68.319196)">
+      <text
+         xml:space="preserve"
+         id="text833-0-5"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:7.9375px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:sans-serif;letter-spacing:0px;word-spacing:0px;white-space:pre;shape-inside:url(#rect835-10-1);fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;"
+         transform="translate(-0.04189825,-0.41581583)"><tspan
+           x="80.886719"
+           y="96.225952"><tspan>Ą</tspan></tspan></text>
+      <rect
+         style="color:#000000;overflow:visible;fill:none;fill-opacity:1;stroke:#000000;stroke-width:0.5;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+         id="rect900-4-9"
+         width="10.583333"
+         height="13.79613"
+         x="78.266167"
+         y="86.745537"
+         ry="1.937705" />
+    </g>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:7.9375px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       x="90.548096"
+       y="65.654472"
+       id="text1035"><tspan
+         sodipodi:role="line"
+         id="tspan1033"
+         x="90.548096"
+         y="65.654472"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:monospace;-inkscape-font-specification:monospace;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px">set_view: upper</tspan></text>
+    <g
+       id="g905-1"
+       transform="translate(22.423437,-17.670388)">
+      <rect
+         style="color:#000000;overflow:visible;fill:#e2e2e2;fill-opacity:1;stroke:#000000;stroke-width:0.5;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+         id="rect900-8"
+         width="10.583333"
+         height="13.79613"
+         x="78.878532"
+         y="85.920006"
+         ry="1.937705" />
+      <text
+         xml:space="preserve"
+         id="text833-7"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:7.9375px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:sans-serif;letter-spacing:0px;word-spacing:0px;white-space:pre;shape-inside:url(#rect835-2);fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;"
+         transform="translate(-0.04189825,-0.41581583)"><tspan
+           x="80.886719"
+           y="96.225952"><tspan>⇧</tspan></tspan></text>
+    </g>
+    <path
+       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.264999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-end:url(#Arrow1Lend-5)"
+       d="m 124.74085,99.691217 c -17.5759,11.622773 -35.932849,0 -35.932849,0"
+       id="path1087-4" />
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:7.9375px;line-height:0.4em;font-family:monospace;-inkscape-font-specification:monospace;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       x="91.116165"
+       y="123.76147"
+       id="text1035-8"><tspan
+         sodipodi:role="line"
+         id="tspan1033-5"
+         x="91.116165"
+         y="123.76147"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52777px;font-family:monospace;-inkscape-font-specification:monospace;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px">locking</tspan><tspan
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52777px;font-family:monospace;-inkscape-font-specification:monospace;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px"
+         sodipodi:role="line"
+         id="tspan1604"
+         x="91.116165"
+         y="128.08197">lock_view: upper</tspan><tspan
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52777px;font-family:monospace;-inkscape-font-specification:monospace;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px"
+         sodipodi:role="line"
+         x="91.116165"
+         y="132.40247"
+         id="tspan1606">unlock_view: lower</tspan></text>
+    <g
+       id="g905-1-9"
+       transform="translate(22.423437,17.64464)">
+      <rect
+         style="color:#000000;overflow:visible;fill:#000000;fill-opacity:1;stroke:#000000;stroke-width:0.5;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+         id="rect900-8-7"
+         width="10.583333"
+         height="13.79613"
+         x="78.878532"
+         y="85.920006"
+         ry="1.937705" />
+      <text
+         xml:space="preserve"
+         id="text833-7-5"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:7.9375px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:sans-serif;letter-spacing:0px;word-spacing:0px;white-space:pre;shape-inside:url(#rect835-2-1);fill:#ffffff;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;"
+         transform="translate(-0.04189825,-0.41581583)"><tspan
+           x="80.886719"
+           y="96.225952"><tspan
+             style="fill:#ffffff;fill-opacity:1">⇧</tspan></tspan></text>
+    </g>
+  </g>
+</svg>

doc/views.md

@@ -0,0 +1,64 @@
+Switching views
+=========
+
+Squeekboard layout files are separated into *views*.
+
+What are views?
+-------------------
+
+A view is the button arrangement which you see on Squeekboard's panel. The view always spans the entire panel area, so it's not possible to see two views at the same time, even if the layout contains multiple views.
+
+Views are useful because they allow to have many more buttons than would fit on the panel at the same time. That works because views can be switched.
+
+Views are different from layouts: they can be switched without affecting the active language, and without touching the globe button. Layouts cannot share views, so switching layouts *always* switches views.
+
+Switching views
+------------------
+
+The model selected for switching views is less similar to "levels" known from physical keyboards, but closer to "rooms", which may resemble a game map.
+
+Buttons don't have states. It's more of a model where each view is a room, and buttons are doors. Switching means moving to the next room, and buttons highlight according to which view/room they lead to or from.
+
+There are two basic kinds of switching buttons: one way (`set_view`), and two way (`locking`). `locking` is the more sophisticated one. When placed inside `lock_view`, it is drawn highlighted, and goes to `unlock view`. When placed inside any other view, it behaves like `set_view`.
+
+![Diagram showing two transitions: from lowercase via `set_view` to uppercase, and back via `locking`](switching.svg) This diagram shows which buttons can switch between two views. Views are shown as circles, and buttons as rounded rectangles.
+The two buttons are separate, and visible only in the view *from which the switch starts*. Note that the `locking` button is shown highlighted. That's because it's in `upper` view, which matches its `lock_view`.
+
+Latching
+----------
+
+`locking` buttons provide a second mode of operation: latching. It's useful when the target view is needed only for a single button press, like entering a single accent or a single capital letter in Latin scripts.
+
+When a latching button is pressed, the keyboard remembers to come back to the current (source) view, and then the view is switched. If another `locking` button is pressed, the source view stays in memory. If a text button is pressed, the view from memory is shown again, and forgotten.
+
+![Diagram showing the switches needed to travel across 3 views: a→A→Ą, while latching.](latching.svg) In this diagram, the dashed line connects the view the typist is seeing to the view remembered for unlatching.
+
+There are two ways to erase the memory without going back to the remembered view. Pressing the button again will permanently switch to the current view, and `set_view` will permanently switch to its target.
+
+In the room metaphor, it's as if tying a thread inside the room before going through the door to the next one. And another `locking` door while holding the thread. Once the Minotaur is slain (text button pressed), the hero follows the thread back to the starting room.
+
+The typist hero cuts the thread in two circumstances: when staying longer in the current room (press button again), or when moving through a `set_view` door.
+
+![Diagram showing possible ways to stop latching, by staying in Ą, by unlatching back to a, and by moving on to ą view.](latching_return.svg) This diagram shows the possible ways to stop latching. One is by pressing a text button, which takes back to the original view. Another is pressing a locking button which appears highlighted (note that it can be any button, what matters is its `lock_view`). Finally, switching to another view using a button that doesn't keep the latch on forgets latching.
+
+The layout author should pay attention that `set_view`'s lack of latching does not come as a surprise to typists.
+
+
+Differences from keyboard levels
+---------------------------------------
+
+Views are **not** like keyboard levels.
+
+On a physical keyboard, the number of buttons can not change when switching levels. In Squeekboard, they can have any arrangement of buttons you could imagine.
+
+When switching levels on a keyboard, for example by pressing Shift, the key press not only affects the meaning of other keys, but also tells the application that it's pressed down. In Squeekboard, pressing buttons to change layouts *does not* do anything but switch the layout. Pressing the switching button especially *does not* tell the application that it was pressed. (This is the reason Shift and AltGr modifiers are not implemented in Squeekboard.)
+
+Why not use the "views" model?
+-------------------------------------
+
+Squeekboard's goal is to support as many scripts as possible, and the author of the initial design doesn't know a whole lot. There are two problems with using the levels metaphor:
+
+Firstly, the levels model assumes that there is a "base" and an "active" level. This does not work well with scripts that have different but equivalent modes of writing. An example is the Kana layout with Katakana and Hiragana, which are both "base".
+Both systems could have been combined, but the view switching designer doesn't have enough experience with different scripts to do that. Some scripts may have different non-hierarchical ways to switch character groups (Balinese?), which could make combining hierarchy with free-form switching even harder.
+
+Secondly, when dealing with languages with a hierarchy, we end up with extra work to eliminate nonsensical combinations. With "symbols" and "uppercase" levels, what does it mean to have both engaged? Eliminating that means extra work. Either validating layouts, so that it's not possible to engage "uppercase" from "symbols", or duplicating, so that "uppercase+symbols" is the same as just "symbols". With "accents" in the mix, this could become a challenge to design well.

eek/eek-gtk-keyboard.c

@@ -45,6 +45,8 @@
 typedef struct _EekGtkKeyboardPrivate
 {
     EekRenderer *renderer; // owned, nullable
+    struct render_geometry render_geometry; // mutable
+
     EekboardContextService *eekboard_context; // unowned reference
     struct submission *submission; // unowned reference
 
@@ -72,12 +74,23 @@ eek_gtk_keyboard_real_realize (GtkWidget      *self)
     GTK_WIDGET_CLASS (eek_gtk_keyboard_parent_class)->realize (self);
 }
 
+static void set_allocation_size(EekGtkKeyboard *gtk_keyboard,
+    struct squeek_layout *layout, gdouble width, gdouble height)
+{
+    // This is where size-dependent surfaces would be released
+    EekGtkKeyboardPrivate *priv =
+        eek_gtk_keyboard_get_instance_private (gtk_keyboard);
+    priv->render_geometry = eek_render_geometry_from_allocation_size(
+        layout, width, height);
+}
+
 static gboolean
 eek_gtk_keyboard_real_draw (GtkWidget *self,
                             cairo_t   *cr)
 {
+    EekGtkKeyboard *keyboard = EEK_GTK_KEYBOARD (self);
     EekGtkKeyboardPrivate *priv =
-        eek_gtk_keyboard_get_instance_private (EEK_GTK_KEYBOARD (self));
+        eek_gtk_keyboard_get_instance_private (keyboard);
     GtkAllocation allocation;
     gtk_widget_get_allocation (self, &allocation);
 
@@ -92,15 +105,14 @@ eek_gtk_keyboard_real_draw (GtkWidget *self,
                     priv->keyboard,
                     pcontext);
 
-        eek_renderer_set_allocation_size (priv->renderer,
+        set_allocation_size (keyboard, priv->keyboard->layout,
-                                          priv->keyboard->layout,
+            allocation.width, allocation.height);
-                                          allocation.width,
-                                          allocation.height);
         eek_renderer_set_scale_factor (priv->renderer,
                                        gtk_widget_get_scale_factor (self));
     }
 
-    eek_renderer_render_keyboard (priv->renderer, priv->submission, cr, priv->keyboard);
+    eek_renderer_render_keyboard (priv->renderer, priv->render_geometry,
+        priv->submission, cr, priv->keyboard);
     return FALSE;
 }
 
@@ -117,8 +129,9 @@ static void
 eek_gtk_keyboard_real_size_allocate (GtkWidget     *self,
                                      GtkAllocation *allocation)
 {
+    EekGtkKeyboard *keyboard = EEK_GTK_KEYBOARD (self);
     EekGtkKeyboardPrivate *priv =
-        eek_gtk_keyboard_get_instance_private (EEK_GTK_KEYBOARD (self));
+        eek_gtk_keyboard_get_instance_private (keyboard);
     // check if the change would switch types
     enum squeek_arrangement_kind new_type = get_type(
                 (uint32_t)(allocation->width - allocation->x),
@@ -130,10 +143,8 @@ eek_gtk_keyboard_real_size_allocate (GtkWidget     *self,
     }
 
     if (priv->renderer) {
-        eek_renderer_set_allocation_size (priv->renderer,
+        set_allocation_size (keyboard, priv->keyboard->layout,
-                                          priv->keyboard->layout,
+            allocation->width, allocation->height);
-                                          allocation->width,
-                                          allocation->height);
     }
 
     GTK_WIDGET_CLASS (eek_gtk_keyboard_parent_class)->
@@ -162,7 +173,7 @@ static void depress(EekGtkKeyboard *self,
     }
     squeek_layout_depress(priv->keyboard->layout,
                           priv->submission,
-                          x, y, eek_renderer_get_transformation(priv->renderer), time, self);
+                          x, y, priv->render_geometry.widget_to_layout, time, self);
 }
 
 static void drag(EekGtkKeyboard *self,
@@ -174,7 +185,7 @@ static void drag(EekGtkKeyboard *self,
     }
     squeek_layout_drag(eekboard_context_service_get_keyboard(priv->eekboard_context)->layout,
                        priv->submission,
-                       x, y, eek_renderer_get_transformation(priv->renderer), time,
+                       x, y, priv->render_geometry.widget_to_layout, time,
                        priv->eekboard_context, self);
 }
 
@@ -185,8 +196,7 @@ static void release(EekGtkKeyboard *self, guint32 time)
         return;
     }
     squeek_layout_release(eekboard_context_service_get_keyboard(priv->eekboard_context)->layout,
-                          priv->submission,
+                          priv->submission, priv->render_geometry.widget_to_layout, time,
-                          eek_renderer_get_transformation(priv->renderer), time,
                           priv->eekboard_context, self);
 }
 
@@ -396,6 +406,24 @@ eek_gtk_keyboard_new (EekboardContextService *eekservice,
     priv->submission = submission;
     priv->layout = layout;
     priv->renderer = NULL;
+    // This should really be done on initialization.
+    // Before the widget is allocated,
+    // we don't really know what geometry it takes.
+    // When it's off the screen, we also kinda don't.
+    struct render_geometry initial_geometry = {
+        // Set to 100 just to make sure if there's any attempt to use it,
+        // it actually gives plausible results instead of blowing up,
+        // e.g. on zero division.
+        .allocation_width = 100,
+        .allocation_height = 100,
+        .widget_to_layout = {
+            .origin_x = 0,
+            .origin_y = 0,
+            .scale = 1,
+        },
+    };
+    priv->render_geometry = initial_geometry;
+
     g_signal_connect (eekservice,
                       "notify::keyboard",
                       G_CALLBACK(on_notify_keyboard),

eek/eek-gtk-keyboard.h

@@ -28,6 +28,7 @@
 #include <glib.h>
 #include <gtk/gtk.h>
 
+#include "eek/eek-renderer.h"
 #include "eek/eek-types.h"
 
 struct submission;

eek/eek-renderer.c

@@ -18,8 +18,6 @@
  * 02110-1301 USA
  */
 
-#include "config.h"
-
 #include <math.h>
 #include <string.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
@@ -33,10 +31,6 @@
 static void render_button_label (cairo_t *cr, GtkStyleContext *ctx,
                                                 const gchar *label, EekBounds bounds);
 
-void eek_render_button                         (EekRenderer *self,
-                                                cairo_t     *cr, const struct squeek_button *button,
-                                                gboolean     pressed, gboolean locked);
-
 static void
 render_outline (cairo_t     *cr,
                 GtkStyleContext *ctx,
@@ -60,21 +54,21 @@ render_outline (cairo_t     *cr,
         position.x, position.y, position.width, position.height);
 }
 
-static void render_button_in_context(gint scale_factor,
+/// Rust interface
+void eek_render_button_in_context(uint32_t scale_factor,
                                      cairo_t     *cr,
                                      GtkStyleContext *ctx,
-                                     const struct squeek_button *button) {
+                                     EekBounds bounds,
+                                     const char *icon_name,
+                                     const gchar *label) {
     /* blank background */
     cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.0);
     cairo_paint (cr);
 
-    EekBounds bounds = squeek_button_get_bounds(button);
     render_outline (cr, ctx, bounds);
     cairo_paint (cr);
 
     /* render icon (if any) */
-    const char *icon_name = squeek_button_get_icon_name(button);
-
     if (icon_name) {
         cairo_surface_t *icon_surface =
             eek_renderer_get_icon_surface (icon_name, 16, scale_factor);
@@ -104,25 +98,27 @@ static void render_button_in_context(gint scale_factor,
         }
     }
 
-    const gchar *label = squeek_button_get_label(button);
     if (label) {
-        render_button_label (cr, ctx, label, squeek_button_get_bounds(button));
+        render_button_label (cr, ctx, label, bounds);
     }
 }
 
-void
+/// Prepare context for drawing the button.
-eek_render_button (EekRenderer *self,
+/// The context MUST be released using the corresponing "put" procedure
-            cairo_t     *cr,
+/// before drawing the next button.
-            const struct squeek_button *button,
+/// Interface for Rust.
-               gboolean     pressed,
+GtkStyleContext *
-               gboolean     locked)
+eek_get_style_context_for_button (EekRenderer *self,
+                                  const char *name,
+                                  const char *outline_name,
+                                  const char *locked_class,
+               uint64_t     pressed)
 {
     GtkStyleContext *ctx = self->button_context;
     /* Set the name of the button on the widget path, using the name obtained
        from the button's symbol. */
     g_autoptr (GtkWidgetPath) path = NULL;
     path = gtk_widget_path_copy (gtk_style_context_get_path (ctx));
-    const char *name = squeek_button_get_name(button);
     gtk_widget_path_iter_set_name (path, -1, name);
 
     /* Update the style context with the updated widget path. */
@@ -131,19 +127,22 @@ eek_render_button (EekRenderer *self,
        (pressed) or normal. */
     gtk_style_context_set_state(ctx,
         pressed ? GTK_STATE_FLAG_ACTIVE : GTK_STATE_FLAG_NORMAL);
-    const char *outline_name = squeek_button_get_outline_name(button);
+    if (locked_class) {
-    if (locked) {
+        gtk_style_context_add_class(ctx, locked_class);
-        gtk_style_context_add_class(ctx, "locked");
     }
     gtk_style_context_add_class(ctx, outline_name);
+    return ctx;
+}
 
-    render_button_in_context(self->scale_factor, cr, ctx, button);
+/// Interface for Rust.
-
+void eek_put_style_context_for_button(GtkStyleContext *ctx,
+                                      const char *outline_name,
+                                      const char *locked_class) {
     // Save and restore functions don't work if gtk_render_* was used in between
     gtk_style_context_set_state(ctx, GTK_STATE_FLAG_NORMAL);
     gtk_style_context_remove_class(ctx, outline_name);
-    if (locked) {
+    if (locked_class) {
-        gtk_style_context_remove_class(ctx, "locked");
+        gtk_style_context_remove_class(ctx, locked_class);
     }
 }
 
@@ -194,22 +193,23 @@ render_button_label (cairo_t     *cr,
 // FIXME: Pass just the active modifiers instead of entire submission
 void
 eek_renderer_render_keyboard (EekRenderer *self,
+                              struct render_geometry geometry,
                               struct submission *submission,
                                    cairo_t     *cr,
                               LevelKeyboard *keyboard)
 {
-    g_return_if_fail (self->allocation_width > 0.0);
+    g_return_if_fail (geometry.allocation_width > 0.0);
-    g_return_if_fail (self->allocation_height > 0.0);
+    g_return_if_fail (geometry.allocation_height > 0.0);
 
     /* Paint the background covering the entire widget area */
     gtk_render_background (self->view_context,
                            cr,
                            0, 0,
-                           self->allocation_width, self->allocation_height);
+                           geometry.allocation_width, geometry.allocation_height);
 
     cairo_save(cr);
-    cairo_translate (cr, self->widget_to_layout.origin_x, self->widget_to_layout.origin_y);
+    cairo_translate (cr, geometry.widget_to_layout.origin_x, geometry.widget_to_layout.origin_y);
-    cairo_scale (cr, self->widget_to_layout.scale, self->widget_to_layout.scale);
+    cairo_scale (cr, geometry.widget_to_layout.scale, geometry.widget_to_layout.scale);
 
     squeek_draw_layout_base_view(keyboard->layout, self, cr);
     squeek_layout_draw_all_changed(keyboard->layout, self, cr, submission);
@@ -261,8 +261,6 @@ static void
 renderer_init (EekRenderer *self)
 {
     self->pcontext = NULL;
-    self->allocation_width = 0.0;
-    self->allocation_height = 0.0;
     self->scale_factor = 1;
 
     self->css_provider = squeek_load_style();
@@ -309,22 +307,18 @@ eek_renderer_new (LevelKeyboard  *keyboard,
     return renderer;
 }
 
-void
+struct render_geometry
-eek_renderer_set_allocation_size (EekRenderer *renderer,
+eek_render_geometry_from_allocation_size (struct squeek_layout *layout,
-                                  struct squeek_layout *layout,
                                   gdouble      width,
                                   gdouble      height)
 {
-    g_return_if_fail (width > 0.0 && height > 0.0);
+    struct render_geometry ret = {
-
+        .allocation_width = width,
-    renderer->allocation_width = width;
+        .allocation_height = height,
-    renderer->allocation_height = height;
+        .widget_to_layout = squeek_layout_calculate_transformation(
-
+            layout, width, height),
-    renderer->widget_to_layout = squeek_layout_calculate_transformation(
+    };
-                layout,
+    return ret;
-                renderer->allocation_width, renderer->allocation_height);
-
-    // This is where size-dependent surfaces would be released
 }
 
 void
@@ -333,6 +327,11 @@ eek_renderer_set_scale_factor (EekRenderer *renderer, gint scale)
     renderer->scale_factor = scale;
 }
 
+/// Rust interface.
+uint32_t eek_renderer_get_scale_factor(EekRenderer *renderer) {
+    return renderer->scale_factor;
+}
+
 cairo_surface_t *
 eek_renderer_get_icon_surface (const gchar *icon_name,
                                gint size,
@@ -356,8 +355,3 @@ eek_renderer_get_icon_surface (const gchar *icon_name,
     }
     return surface;
 }
-
-struct transformation
-eek_renderer_get_transformation (EekRenderer *renderer) {
-    return renderer->widget_to_layout;
-}

eek/eek-renderer.h

@@ -41,22 +41,23 @@ typedef struct EekRenderer
     gchar *extra_style; // owned
 
     // Mutable state
+    gint scale_factor; /* the outputs scale factor */
+} EekRenderer;
+
+
+/// Mutable part of the renderer state.
+/// TODO: Possibly should include scale factor.
+struct render_geometry {
     /// Background extents
     gdouble allocation_width;
     gdouble allocation_height;
-    gint scale_factor; /* the outputs scale factor */
     /// Coords transformation
     struct transformation widget_to_layout;
-} EekRenderer;
+};
-
 
 GType            eek_renderer_get_type         (void) G_GNUC_CONST;
 EekRenderer     *eek_renderer_new              (LevelKeyboard     *keyboard,
                                                 PangoContext    *pcontext);
-void             eek_renderer_set_allocation_size
-                                               (EekRenderer     *renderer, struct squeek_layout *layout,
-                                                gdouble          width,
-                                                gdouble          height);
 void             eek_renderer_set_scale_factor (EekRenderer     *renderer,
                                                 gint             scale);
 
@@ -64,13 +65,14 @@ cairo_surface_t *eek_renderer_get_icon_surface(const gchar     *icon_name,
                                                 gint             size,
                                                 gint             scale);
 
-void             eek_renderer_render_keyboard  (EekRenderer     *renderer, struct submission *submission,
+void             eek_renderer_render_keyboard  (EekRenderer     *renderer, struct render_geometry geometry, struct submission *submission,
                                                 cairo_t         *cr, LevelKeyboard *keyboard);
 void
 eek_renderer_free (EekRenderer        *self);
 
-struct transformation
+struct render_geometry
-eek_renderer_get_transformation (EekRenderer *renderer);
+eek_render_geometry_from_allocation_size (struct squeek_layout *layout,
+    gdouble      width, gdouble      height);
 
 G_END_DECLS
 #endif  /* EEK_RENDERER_H */

eek/eek-types.h

@@ -90,13 +90,5 @@ struct transformation {
     gdouble scale;
 };
 
-struct squeek_button;
-struct squeek_row;
-
-/// Represents the path to the button within a view
-struct button_place {
-    const struct squeek_row *row;
-    const struct squeek_button *button;
-};
 G_END_DECLS
 #endif  /* EEK_TYPES_H */

eekboard/eekboard-context-service.c

@@ -128,30 +128,22 @@ settings_get_layout(GSettings *settings, char **type, char **layout)
 
 void
 eekboard_context_service_use_layout(EekboardContextService *context, struct squeek_layout_state *state, uint32_t timestamp) {
-    gchar *layout_name = state->overlay_name;
+    gchar *layout_name = state->layout_name;
-
+    gchar *overlay_name = state->overlay_name;
-    if (layout_name == NULL) {
-        layout_name = state->layout_name;
-
-        switch (state->purpose) {
-        case ZWP_TEXT_INPUT_V3_CONTENT_PURPOSE_NUMBER:
-        case ZWP_TEXT_INPUT_V3_CONTENT_PURPOSE_PHONE:
-            layout_name = "number";
-            break;
-        case ZWP_TEXT_INPUT_V3_CONTENT_PURPOSE_TERMINAL:
-            layout_name = "terminal";
-            break;
-        default:
-            ;
-        }
 
+    // try to get the best keyboard layout
     if (layout_name == NULL) {
         layout_name = "us";
     }
+
+    // overlay is "Normal" for most layouts, we will only look for "terminal" in rust code.
+    // for now just avoid passing a null pointer
+    if (overlay_name == NULL) {
+        overlay_name = "";    // fallback to Normal
     }
     
     // generic part follows
-    struct squeek_layout *layout = squeek_load_layout(layout_name, state->arrangement);
+    struct squeek_layout *layout = squeek_load_layout(layout_name, state->arrangement, state->purpose, overlay_name);
     LevelKeyboard *keyboard = level_keyboard_new(layout);
     // set as current
     LevelKeyboard *previous_keyboard = context->keyboard;

meson.build

@@ -1,7 +1,7 @@
 project(
     'squeekboard',
     'c', 'rust',
-    version: '1.12.0',
+    version: '1.13.0',
     license: 'GPLv3',
     meson_version: '>=0.51.0',
     default_options: [

protocols/input-method-unstable-v2.xml

@@ -294,8 +294,8 @@
 
         The serial number reflects the last state of the zwp_input_method_v2
         object known to the client. The value of the serial argument must be
-        equal to the number of commit requests already issued on that object.
+        equal to the number of done events already issued on that object.
-        When the compositor receives a done event with a serial different than
+        When the compositor receives a commit request with a serial different than
         the number of past commit requests, it must proceed as normal, except
         it should not change the current state of the zwp_input_method_v2
         object.

src/action.rs

@@ -10,13 +10,14 @@ pub struct KeySym(pub String);
 type View = String;
 
 /// Use to send modified keypresses
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum Modifier {
     /// Control and Alt are the only modifiers
     /// which doesn't interfere with levels,
     /// so it's simple to implement as levels are deprecated in squeekboard.
     Control,
     Alt,
+    Mod4,
 }
 
 /// Action to perform on the keypress and, in reverse, on keyrelease
@@ -29,6 +30,11 @@ pub enum Action {
         lock: View,
         /// When unlocked by pressing it or emitting a key
         unlock: View,
+        /// Whether key has a latched state
+        /// that pops when another key is pressed.
+        latches: bool,
+        /// Should take on *locked* appearance whenever latch comes back to those views.
+        looks_locked_from: Vec<View>,
     },
     /// Hold this modifier for as long as the button is pressed
     ApplyModifier(Modifier),
@@ -48,14 +54,24 @@ pub enum Action {
 impl Action {
     pub fn is_locked(&self, view_name: &str) -> bool {
         match self {
-            Action::LockView { lock, unlock: _ } => lock == view_name,
+            Action::LockView { lock, unlock: _, latches: _, looks_locked_from: _ } => lock == view_name,
+            _ => false,
+        }
+    }
+    pub fn has_locked_appearance_from(&self, locked_view_name: &str) -> bool {
+        match self {
+            Action::LockView { lock: _, unlock: _, latches: _, looks_locked_from } => {
+                looks_locked_from.iter()
+                    .find(|view| locked_view_name == view.as_str())
+                    .is_some()
+            },
             _ => false,
         }
     }
     pub fn is_active(&self, view_name: &str) -> bool {
         match self {
             Action::SetView(view) => view == view_name,
-            Action::LockView { lock, unlock: _ } => lock == view_name,
+            Action::LockView { lock, unlock: _, latches: _, looks_locked_from: _ } => lock == view_name,
             _ => false,
         }
     }

src/data.rs

@@ -12,6 +12,7 @@ use std::io;
 use std::path::PathBuf;
 use std::rc::Rc;
 use std::vec::Vec;
+use std::convert::TryFrom;
 
 use xkbcommon::xkb;
 
@@ -27,6 +28,7 @@ use ::resources;
 use ::util::c::as_str;
 use ::util::hash_map_map;
 use ::xdg;
+use ::imservice::ContentPurpose;
 
 // traits, derives
 use serde::Deserialize;
@@ -42,19 +44,37 @@ pub mod c {
     #[no_mangle]
     pub extern "C"
     fn squeek_load_layout(
-        name: *const c_char,
+        name: *const c_char,    // name of the keyboard
-        type_: u32,
+        type_: u32,             // type like Wide
+        variant: u32,          // purpose variant like numeric, terminal...
+        overlay: *const c_char, // the overlay (looking for "terminal")
     ) -> *mut ::layout::Layout {
         let type_ = match type_ {
             0 => ArrangementKind::Base,
             1 => ArrangementKind::Wide,
             _ => panic!("Bad enum value"),
         };
+        
         let name = as_str(&name)
             .expect("Bad layout name")
             .expect("Empty layout name");
 
-        let (kind, layout) = load_layout_data_with_fallback(&name, type_);
+        let variant = ContentPurpose::try_from(variant)
+                    .or_print(
+                        logging::Problem::Warning,
+                        "Received invalid purpose value",
+                    )
+                    .unwrap_or(ContentPurpose::Normal);
+
+        let overlay_str = as_str(&overlay)
+                .expect("Bad overlay name")
+                .expect("Empty overlay name");
+        let overlay_str = match overlay_str {
+            "" => None,
+            other => Some(other),
+        };
+
+        let (kind, layout) = load_layout_data_with_fallback(&name, type_, variant, overlay_str);
         let layout = ::layout::Layout::new(layout, kind);
         Box::into_raw(Box::new(layout))
     }
@@ -97,85 +117,156 @@ impl fmt::Display for DataSource {
     }
 }
 
-type LayoutSource = (ArrangementKind, DataSource);
+/* All functions in this family carry around ArrangementKind,
+ * because it's not guaranteed to be preserved,
+ * and the resulting layout needs to know which version was loaded.
+ * See `squeek_layout_get_kind`.
+ * Possible TODO: since this is used only in styling,
+ * and makes the below code nastier than needed, maybe it should go.
+ */
 
-/// Lists possible sources, with 0 as the most preferred one
+/// Returns ordered names treating `name` as the base name,
-/// Trying order: native lang of the right kind, native base,
+/// ignoring any `+` inside.
-/// fallback lang of the right kind, fallback base
+fn _get_arrangement_names(name: &str, arrangement: ArrangementKind)
-fn list_layout_sources(
+    -> Vec<(ArrangementKind, String)>
-    name: &str,
+{
-    kind: ArrangementKind,
+    let name_with_arrangement = match arrangement {    
-    keyboards_path: Option<PathBuf>,
+        ArrangementKind::Base => name.into(),
-) -> Vec<LayoutSource> {
+        ArrangementKind::Wide => format!("{}_wide", name),
-    // Just a simplification of often called code.
+    };
-    let add_by_name = |
+    
-        mut ret: Vec<LayoutSource>,
+    let mut ret = Vec::new();
-        name: &str,
+    if name_with_arrangement != name {
-        kind: &ArrangementKind,
+        ret.push((arrangement, name_with_arrangement));
-    | -> Vec<LayoutSource> {
-        if let Some(path) = keyboards_path.clone() {
-            ret.push((
-                kind.clone(),
-                DataSource::File(
-                    path.join(name.to_owned()).with_extension("yaml")
-                )
-            ))
     }
-
+    ret.push((ArrangementKind::Base, name.into()));
-        ret.push((
-            kind.clone(),
-            DataSource::Resource(name.into())
-        ));
     ret
-    };
-
-    // Another grouping.
-    let add_by_kind = |ret, name: &str, kind| {
-        let ret = match kind {
-            &ArrangementKind::Base => ret,
-            kind => add_by_name(
-                ret,
-                &name_with_arrangement(name.into(), kind),
-                kind,
-            ),
-        };
-
-        add_by_name(ret, name, &ArrangementKind::Base)
-    };
-
-    fn name_with_arrangement(name: String, kind: &ArrangementKind) -> String {
-        match kind {    
-            ArrangementKind::Base => name,
-            ArrangementKind::Wide => name + "_wide",
-        }
 }
 
-    let ret = Vec::new();
+/// Returns names accounting for any `+` in the `name`,
+/// including the fallback to the default layout.
+fn get_preferred_names(name: &str, kind: ArrangementKind)
+    -> Vec<(ArrangementKind, String)>
+{
+    let mut ret = _get_arrangement_names(name, kind);
     
-    // Name as given takes priority.
+    let base_name_preferences = {
-    let ret = add_by_kind(ret, name, &kind);
-
-    // Then try non-alternative name if applicable (`us` for `us+colemak`).
-    let ret = {
         let mut parts = name.splitn(2, '+');
         match parts.next() {
             Some(base) => {
-                // The name is already equal to base, so it was already added.
+                // The name is already equal to base, so nothing to add
-                if base == name { ret }
+                if base == name {
-                else {
+                    vec![]
-                    add_by_kind(ret, base, &kind)
+                } else {
+                    _get_arrangement_names(base, kind)
                 }
             },
             // The layout's base name starts with a "+". Weird but OK.
             None => {
                 log_print!(logging::Level::Surprise, "Base layout name is empty: {}", name);
-                ret
+                vec![]
             }
         }
     };
     
-    // No other choices left, so give anything.
+    ret.extend(base_name_preferences.into_iter());
-    add_by_kind(ret, FALLBACK_LAYOUT_NAME.into(), &kind)
+    let fallback_names = _get_arrangement_names(FALLBACK_LAYOUT_NAME, kind);
+    ret.extend(fallback_names.into_iter());
+    ret
+}
+
+/// Includes the subdirectory before the forward slash.
+type LayoutPath = String;
+
+// This is only used inside iter_fallbacks_with_meta.
+// Placed at the top scope
+// because `use LayoutPurpose::*;`
+// complains about "not in scope" otherwise.
+// This seems to be a Rust 2015 edition problem.
+/// Helper for determining where to look up the layout.
+enum LayoutPurpose<'a> {
+    Default,
+    Special(&'a str),
+}
+
+/// Returns the directory string
+/// where the layout should be looked up, including the slash.
+fn get_directory_string(
+    content_purpose: ContentPurpose,
+    overlay: Option<&str>) -> String
+{
+    use self::LayoutPurpose::*;
+
+    let layout_purpose = match overlay {
+        None => match content_purpose {
+            ContentPurpose::Number => Special("number"),
+            ContentPurpose::Digits => Special("number"),
+            ContentPurpose::Phone => Special("number"),
+            ContentPurpose::Terminal => Special("terminal"),
+            _ => Default,
+        },
+        Some(overlay) => Special(overlay),
+    };
+
+    // For intuitiveness,
+    // default purpose layouts are stored in the root directory,
+    // as they correspond to typical text
+    // and are seen the most often.
+    match layout_purpose {
+        Default => "".into(),
+        Special(purpose) => format!("{}/", purpose),
+    }
+}
+
+/// Returns an iterator over all fallback paths.
+fn to_layout_paths(
+    name_fallbacks: Vec<(ArrangementKind, String)>,
+    content_purpose: ContentPurpose,
+    overlay: Option<&str>,
+) -> impl Iterator<Item=(ArrangementKind, LayoutPath)> {
+    let prepend_directory = get_directory_string(content_purpose, overlay);
+
+    name_fallbacks.into_iter()
+        .map(move |(arrangement, name)|
+            (arrangement, format!("{}{}", prepend_directory, name))
+        )
+}
+
+type LayoutSource = (ArrangementKind, DataSource);
+
+fn to_layout_sources(
+    layout_paths: impl Iterator<Item=(ArrangementKind, LayoutPath)>,
+    filesystem_path: Option<PathBuf>,
+) -> impl Iterator<Item=LayoutSource> {
+    layout_paths.flat_map(move |(arrangement, layout_path)| {
+        let mut sources = Vec::new();
+        if let Some(path) = &filesystem_path {
+            sources.push((
+                arrangement,
+                DataSource::File(
+                    path.join(&layout_path)
+                        .with_extension("yaml")
+                )
+            ));
+        };
+        sources.push((arrangement, DataSource::Resource(layout_path.clone())));
+        sources.into_iter()
+    })
+}
+
+/// Returns possible sources, with first as the most preferred one.
+/// Trying order: native lang of the right kind, native base,
+/// fallback lang of the right kind, fallback base
+fn iter_layout_sources(
+    name: &str,
+    arrangement: ArrangementKind,
+    purpose: ContentPurpose,
+    ui_overlay: Option<&str>,
+    layout_storage: Option<PathBuf>,
+) -> impl Iterator<Item=LayoutSource> {
+    let names = get_preferred_names(name, arrangement);
+    let paths = to_layout_paths(names, purpose, ui_overlay);
+    to_layout_sources(paths, layout_storage)
 }
 
 fn load_layout_data(source: DataSource)
@@ -202,12 +293,16 @@ fn load_layout_data(source: DataSource)
 fn load_layout_data_with_fallback(
     name: &str,
     kind: ArrangementKind,
+    purpose: ContentPurpose,
+    overlay: Option<&str>,
 ) -> (ArrangementKind, ::layout::LayoutData) {
+
+    // Build the path to the right keyboard layout subdirectory
     let path = env::var_os("SQUEEKBOARD_KEYBOARDSDIR")
         .map(PathBuf::from)
         .or_else(|| xdg::data_path("squeekboard/keyboards"));
 
-    for (kind, source) in list_layout_sources(name, kind, path) {
+    for (kind, source) in iter_layout_sources(&name, kind, purpose, overlay, path) {
         let layout = load_layout_data(source.clone());
         match layout {
             Err(e) => match (e, source) {
@@ -289,7 +384,13 @@ struct ButtonMeta {
 #[serde(deny_unknown_fields)]
 enum Action {
     #[serde(rename="locking")]
-    Locking { lock_view: String, unlock_view: String },
+    Locking {
+        lock_view: String,
+        unlock_view: String,
+        pops: Option<bool>,
+        #[serde(default)]
+        looks_locked_from: Vec<String>,
+    },
     #[serde(rename="set_view")]
     SetView(String),
     #[serde(rename="show_prefs")]
@@ -543,7 +644,7 @@ fn create_action<H: logging::Handler>(
         Text(String),
         Keysym(String),
         Modifier(Modifier),
-    };
+    }
     
     let submission = match (
         &symbol_meta.action,
@@ -600,7 +701,9 @@ fn create_action<H: logging::Handler>(
             )
         ),
         SubmitData::Action(Action::Locking {
-            lock_view, unlock_view
+            lock_view, unlock_view,
+            pops,
+            looks_locked_from,
         }) => ::action::Action::LockView {
             lock: filter_view_name(
                 name,
@@ -614,6 +717,8 @@ fn create_action<H: logging::Handler>(
                 &view_names,
                 warning_handler,
             ),
+            latches: pops.unwrap_or(true),
+            looks_locked_from,
         },
         SubmitData::Action(
             Action::ShowPrefs
@@ -658,6 +763,9 @@ fn create_action<H: logging::Handler>(
             Modifier::Alt => action::Action::ApplyModifier(
                 action::Modifier::Alt,
             ),
+            Modifier::Mod4 => action::Action::ApplyModifier(
+                action::Modifier::Mod4,
+            ),
             unsupported_modifier => {
                 warning_handler.handle(
                     logging::Level::Bug,
@@ -926,11 +1034,11 @@ mod tests {
     
     /// First fallback should be to builtin, not to FALLBACK_LAYOUT_NAME
     #[test]
-    fn fallbacks_order() {
+    fn test_fallback_basic_builtin() {
-        let sources = list_layout_sources("nb", ArrangementKind::Base, None);
+        let sources = iter_layout_sources("nb", ArrangementKind::Base, ContentPurpose::Normal, None, None);
         
         assert_eq!(
-            sources,
+            sources.collect::<Vec<_>>(),
             vec!(
                 (ArrangementKind::Base, DataSource::Resource("nb".into())),
                 (
@@ -941,13 +1049,35 @@ mod tests {
         );
     }
     
-    /// If layout contains a "+", it should reach for what's in front of it too.
+    /// Prefer loading from file system before builtin.
     #[test]
-    fn fallbacks_order_base() {
+    fn test_preferences_order_path() {
-        let sources = list_layout_sources("nb+aliens", ArrangementKind::Base, None);
+        let sources = iter_layout_sources("nb", ArrangementKind::Base, ContentPurpose::Normal, None, Some(".".into()));
         
         assert_eq!(
-            sources,
+            sources.collect::<Vec<_>>(),
+            vec!(
+                (ArrangementKind::Base, DataSource::File("./nb.yaml".into())),
+                (ArrangementKind::Base, DataSource::Resource("nb".into())),
+                (
+                    ArrangementKind::Base,
+                    DataSource::File("./us.yaml".into())
+                ),
+                (
+                    ArrangementKind::Base,
+                    DataSource::Resource("us".into())
+                ),
+            )
+        );
+    }
+
+    /// If layout contains a "+", it should reach for what's in front of it too.
+    #[test]
+    fn test_preferences_order_base() {
+        let sources = iter_layout_sources("nb+aliens", ArrangementKind::Base, ContentPurpose::Normal, None, None);
+
+        assert_eq!(
+            sources.collect::<Vec<_>>(),
             vec!(
                 (ArrangementKind::Base, DataSource::Resource("nb+aliens".into())),
                 (ArrangementKind::Base, DataSource::Resource("nb".into())),
@@ -959,6 +1089,58 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_preferences_order_arrangement() {
+        let sources = iter_layout_sources("nb", ArrangementKind::Wide, ContentPurpose::Normal, None, None);
+
+        assert_eq!(
+            sources.collect::<Vec<_>>(),
+            vec!(
+                (ArrangementKind::Wide, DataSource::Resource("nb_wide".into())),
+                (ArrangementKind::Base, DataSource::Resource("nb".into())),
+                (
+                    ArrangementKind::Wide,
+                    DataSource::Resource("us_wide".into())
+                ),
+                (
+                    ArrangementKind::Base,
+                    DataSource::Resource("us".into())
+                ),
+            )
+        );
+    }
+
+    #[test]
+    fn test_preferences_order_overlay() {
+        let sources = iter_layout_sources("nb", ArrangementKind::Base, ContentPurpose::Normal, Some("terminal"), None);
+
+        assert_eq!(
+            sources.collect::<Vec<_>>(),
+            vec!(
+                (ArrangementKind::Base, DataSource::Resource("terminal/nb".into())),
+                (
+                    ArrangementKind::Base,
+                    DataSource::Resource("terminal/us".into())
+                ),
+            )
+        );
+    }
+
+    #[test]
+    fn test_preferences_order_hint() {
+        let sources = iter_layout_sources("nb", ArrangementKind::Base, ContentPurpose::Terminal, None, None);
+
+        assert_eq!(
+            sources.collect::<Vec<_>>(),
+            vec!(
+                (ArrangementKind::Base, DataSource::Resource("terminal/nb".into())),
+                (
+                    ArrangementKind::Base,
+                    DataSource::Resource("terminal/us".into())
+                ),
+            )
+        );
+    }
 
     #[test]
     fn unicode_keysym() {

src/drawing.rs

@@ -3,20 +3,24 @@
 use cairo;
 use std::cell::RefCell;
 
-use ::action::Action;
+use ::action::{ Action, Modifier };
 use ::keyboard;
-use ::layout::{ Button, Layout };
+use ::layout::{ Button, Label, LatchedState, Layout };
-use ::layout::c::{ EekGtkKeyboard, Point };
+use ::layout::c::{ Bounds, EekGtkKeyboard, Point };
 use ::submission::Submission;
 
 use glib::translate::FromGlibPtrNone;
 use gtk::WidgetExt;
 
+use std::collections::HashSet;
+use std::ffi::CStr;
+use std::ptr;
+
 mod c {
     use super::*;
 
     use cairo_sys;
-    use std::os::raw::c_void;
+    use std::os::raw::{ c_char, c_void };
     
     // This is constructed only in C, no need for warnings
     #[allow(dead_code)]
@@ -24,18 +28,44 @@ mod c {
     #[derive(Clone, Copy)]
     pub struct EekRenderer(*const c_void);
 
-    #[no_mangle]
+    // This is constructed only in C, no need for warnings
+    /// Just don't clone this for no reason.
+    #[allow(dead_code)]
+    #[repr(transparent)]
+    #[derive(Clone, Copy)]
+    pub struct GtkStyleContext(*const c_void);
+
+
     extern "C" {
-        // Button and View inside CButtonPlace are safe to pass to C
-        // as long as they don't outlive the call
-        // and nothing dereferences them
         #[allow(improper_ctypes)]
-        pub fn eek_render_button(
+        pub fn eek_renderer_get_scale_factor(
             renderer: EekRenderer,
+        ) -> u32;
+
+        #[allow(improper_ctypes)]
+        pub fn eek_render_button_in_context(
+            scale_factor: u32,
             cr: *mut cairo_sys::cairo_t,
-            button: *const Button,
+            ctx: GtkStyleContext,
+            bounds: Bounds,
+            icon_name: *const c_char,
+            label: *const c_char,
+        );
+
+        #[allow(improper_ctypes)]
+        pub fn eek_get_style_context_for_button(
+            renderer: EekRenderer,
+            name: *const c_char,
+            outline_name: *const c_char,
+            locked_class: *const c_char,
             pressed: u64,
-            locked: u64,
+        ) -> GtkStyleContext;
+
+        #[allow(improper_ctypes)]
+        pub fn eek_put_style_context_for_button(
+            ctx: GtkStyleContext,
+            outline_name: *const c_char,
+            locked_class: *const c_char,
         );
     }
 
@@ -55,13 +85,16 @@ mod c {
 
         layout.foreach_visible_button(|offset, button| {
             let state = RefCell::borrow(&button.state).clone();
-            let active_mod = match &state.action {
+
-                Action::ApplyModifier(m) => active_modifiers.contains(m),
+            let locked = LockedStyle::from_action(
-                _ => false,
+                &state.action,
-            };
+                &active_modifiers,
-            let locked = state.action.is_active(&layout.current_view)
+                layout.get_view_latched(),
-                | active_mod;
+                &layout.current_view,
-            if state.pressed == keyboard::PressType::Pressed || locked {
+            );
+            if state.pressed == keyboard::PressType::Pressed
+                || locked != LockedStyle::Free
+            {
                 render_button_at_position(
                     renderer, &cr,
                     offset,
@@ -87,20 +120,55 @@ mod c {
                 renderer, &cr,
                 offset,
                 button.as_ref(),
-                keyboard::PressType::Released, false,
+                keyboard::PressType::Released,
+                LockedStyle::Free,
             );
         })
     }
 }
 
+#[derive(Clone, Copy, PartialEq, Debug)]
+enum LockedStyle {
+    Free,
+    Latched,
+    Locked,
+}
+
+impl LockedStyle {
+    fn from_action(
+        action: &Action,
+        mods: &HashSet<Modifier>,
+        latched_view: &LatchedState,
+        current_view: &str,
+    ) -> LockedStyle {
+        let active_mod = match action {
+            Action::ApplyModifier(m) => mods.contains(m),
+            _ => false,
+        };
+        
+        let active_view = action.is_active(current_view);
+        let latched_button = match latched_view {
+            LatchedState::Not => false,
+            LatchedState::FromView(view) => !action.has_locked_appearance_from(view),
+        };
+        match (active_mod, active_view, latched_button) {
+            // Modifiers don't latch.
+            (true, _, _) => LockedStyle::Locked,
+            (false, true, false) => LockedStyle::Locked,
+            (false, true, true) => LockedStyle::Latched,
+            _ => LockedStyle::Free,
+        }
+    }
+}
+
 /// Renders a button at a position (button's own bounds ignored)
-pub fn render_button_at_position(
+fn render_button_at_position(
     renderer: c::EekRenderer,
     cr: &cairo::Context,
     position: Point,
     button: &Button,
     pressed: keyboard::PressType,
-    locked: bool,
+    locked: LockedStyle,
 ) {
     cr.save();
     cr.translate(position.x, position.y);
@@ -109,19 +177,110 @@ pub fn render_button_at_position(
         button.size.width, button.size.height
     );
     cr.clip();
-    unsafe {
+
-        c::eek_render_button(
+    let scale_factor = unsafe {
+        c::eek_renderer_get_scale_factor(renderer)
+    };
+    let bounds = button.get_bounds();
+    let (label_c, icon_name_c) = match &button.label {
+        Label::Text(text) => (text.as_ptr(), ptr::null()),
+        Label::IconName(name) => {
+            let l = unsafe {
+                // CStr doesn't allocate anything, so it only points to
+                // the 'static str, avoiding a memory leak
+                CStr::from_bytes_with_nul_unchecked(b"icon\0")
+            };
+            (l.as_ptr(), name.as_ptr())
+        },
+    };
+
+    with_button_context(
         renderer,
+        button,
+        pressed,
+        locked,
+        |ctx| unsafe {
+            // TODO: split into separate procedures:
+            // draw outline, draw label, draw icon.
+            c::eek_render_button_in_context(
+                scale_factor,
                 cairo::Context::to_raw_none(&cr),
-            button as *const Button,
+                *ctx,
+                bounds,
+                icon_name_c,
+                label_c,
+            )
+        }
+    );
+
+    cr.restore();
+}
+
+fn with_button_context<R, F: FnOnce(&c::GtkStyleContext) -> R>(
+    renderer: c::EekRenderer,
+    button: &Button,
+    pressed: keyboard::PressType,
+    locked: LockedStyle,
+    operation: F,
+) -> R {
+    let outline_name_c = button.outline_name.as_ptr();
+    let locked_class_c = match locked {
+        LockedStyle::Free => ptr::null(),
+        LockedStyle::Locked => unsafe {
+            CStr::from_bytes_with_nul_unchecked(b"locked\0").as_ptr()
+        },
+        LockedStyle::Latched => unsafe {
+            CStr::from_bytes_with_nul_unchecked(b"latched\0").as_ptr()
+        },
+    };
+    
+    let ctx = unsafe {
+        c::eek_get_style_context_for_button(
+            renderer,
+            button.name.as_ptr(),
+            outline_name_c,
+            locked_class_c,
             pressed as u64,
-            locked as u64,
         )
     };
-    cr.restore();
+    
+    let r = operation(&ctx);
+
+    unsafe {
+        c::eek_put_style_context_for_button(
+            ctx,
+            outline_name_c,
+            locked_class_c,
+        )
+    };
+
+    r
 }
 
 pub fn queue_redraw(keyboard: EekGtkKeyboard) {
     let widget = unsafe { gtk::Widget::from_glib_none(keyboard.0) };
     widget.queue_draw();
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_exit_only() {
+        assert_eq!(
+            LockedStyle::from_action(
+                &Action::LockView {
+                    lock: "ab".into(), 
+                    unlock: "a".into(),
+                    latches: true,
+                    looks_locked_from: vec!["b".into()],
+                },
+                &HashSet::new(),
+                &LatchedState::FromView("b".into()),
+                "ab",
+            ),
+            LockedStyle::Locked,
+        );
+    }
+}

src/imservice.rs

@@ -32,9 +32,9 @@ pub mod c {
     #[repr(transparent)]
     pub struct InputMethod(*const c_void);
 
-    #[no_mangle]
     extern "C" {
         fn imservice_destroy_im(im: *mut c::InputMethod);
+
         #[allow(improper_ctypes)] // IMService will never be dereferenced in C
         pub fn imservice_connect_listeners(im: *mut InputMethod, imservice: *const IMService);
         pub fn eek_input_method_commit_string(im: *mut InputMethod, text: *const c_char);
@@ -149,6 +149,8 @@ pub mod c {
             ..IMProtocolState::default()
         };
 
+        imservice.serial += Wrapping(1u32);
+
         if active_changed {
             (imservice.active_callback)(imservice.current.active);
             if imservice.current.active {
@@ -404,7 +406,6 @@ impl IMService {
                 unsafe {
                     c::eek_input_method_commit(self.im, self.serial.0)
                 }
-                self.serial += Wrapping(1u32);
                 Ok(())
             },
             false => Err(SubmitError::NotActive),

src/layout.h

@@ -26,19 +26,12 @@ struct squeek_layout_state {
 
 struct squeek_layout;
 
-EekBounds squeek_button_get_bounds(const struct squeek_button*);
-const char *squeek_button_get_label(const struct squeek_button*);
-const char *squeek_button_get_icon_name(const struct squeek_button*);
-const char *squeek_button_get_name(const struct squeek_button*);
-const char *squeek_button_get_outline_name(const struct squeek_button*);
-
-void squeek_button_print(const struct squeek_button* button);
 
 struct transformation squeek_layout_calculate_transformation(
         const struct squeek_layout *layout,
         double allocation_width, double allocation_size);
 
-struct squeek_layout *squeek_load_layout(const char *name, uint32_t type);
+struct squeek_layout *squeek_load_layout(const char *name, uint32_t type, uint32_t variant_type, const char *overlay_name);
 enum squeek_arrangement_kind squeek_layout_get_kind(const struct squeek_layout *);
 void squeek_layout_free(struct squeek_layout*);
 

src/layout.rs

@@ -41,9 +41,7 @@ pub mod c {
     use super::*;
 
     use gtk_sys;
-    use std::ffi::CStr;
+    use std::os::raw::c_void;
-    use std::os::raw::{ c_char, c_void };
-    use std::ptr;
 
     use std::ops::{ Add, Sub };
 
@@ -52,7 +50,6 @@ pub mod c {
     #[derive(Copy, Clone)]
     pub struct EekGtkKeyboard(pub *const gtk_sys::GtkWidget);
 
-    #[no_mangle]
     extern "C" {
         #[allow(improper_ctypes)]
         pub fn eek_gtk_keyboard_emit_feedback(
@@ -163,64 +160,6 @@ pub mod c {
 
     // The following defined in Rust. TODO: wrap naked pointers to Rust data inside RefCells to prevent multiple writers
     
-    #[no_mangle]
-    pub extern "C"
-    fn squeek_button_get_bounds(button: *const ::layout::Button) -> Bounds {
-        let button = unsafe { &*button };
-        Bounds {
-            x: 0.0, y: 0.0,
-            width: button.size.width, height: button.size.height
-        }
-    }
-
-    #[no_mangle]
-    pub extern "C"
-    fn squeek_button_get_label(
-        button: *const ::layout::Button
-    ) -> *const c_char {
-        let button = unsafe { &*button };
-        match &button.label {
-            Label::Text(text) => text.as_ptr(),
-            // returning static strings to C is a bit cumbersome
-            Label::IconName(_) => unsafe {
-                // CStr doesn't allocate anything, so it only points to
-                // the 'static str, avoiding a memory leak
-                CStr::from_bytes_with_nul_unchecked(b"icon\0")
-            }.as_ptr(),
-        }
-    }
-    
-    #[no_mangle]
-    pub extern "C"
-    fn squeek_button_get_icon_name(button: *const Button) -> *const c_char {
-        let button = unsafe { &*button };
-        match &button.label {
-            Label::Text(_) => ptr::null(),
-            Label::IconName(name) => name.as_ptr(),
-        }
-    }
-    
-    #[no_mangle]
-    pub extern "C"
-    fn squeek_button_get_name(button: *const Button) -> *const c_char {
-        let button = unsafe { &*button };
-        button.name.as_ptr()
-    }
-    
-    #[no_mangle]
-    pub extern "C"
-    fn squeek_button_get_outline_name(button: *const Button) -> *const c_char {
-        let button = unsafe { &*button };
-        button.outline_name.as_ptr()
-    }
-    
-    #[no_mangle]
-    pub extern "C"
-    fn squeek_button_print(button: *const ::layout::Button) {
-        let button = unsafe { &*button };
-        println!("{:?}", button);
-    }
-    
     /// Positions the layout contents within the available space.
     /// The origin of the transformation is the point inside the margins.
     #[no_mangle]
@@ -485,6 +424,15 @@ pub struct Button {
     pub state: Rc<RefCell<KeyState>>,
 }
 
+impl Button {
+    pub fn get_bounds(&self) -> c::Bounds {
+        c::Bounds {
+            x: 0.0, y: 0.0,
+            width: self.size.width, height: self.size.height,
+        }
+    }
+}
+
 /// The graphical representation of a row of buttons
 #[derive(Clone, Debug)]
 pub struct Row {
@@ -552,6 +500,7 @@ pub struct Spacing {
     pub button: f64,
 }
 
+#[derive(Clone)]
 pub struct View {
     /// Rows together with their offsets from the top left
     rows: Vec<(c::Point, Row)>,
@@ -651,7 +600,7 @@ impl View {
 }
 
 /// The physical characteristic of layout for the purpose of styling
-#[derive(Clone, PartialEq, Debug)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 pub enum ArrangementKind {
     Base = 0,
     Wide = 1,
@@ -665,6 +614,19 @@ pub struct Margins {
     pub right: f64,
 }
 
+#[derive(Clone, Debug, PartialEq)]
+pub enum LatchedState {
+    /// Holds view to return to.
+    FromView(String),
+    Not,
+}
+
+impl LatchedState {
+    pub fn is_latched(&self) -> bool {
+        self != &LatchedState::Not
+    }
+}
+
 // TODO: split into sth like
 // Arrangement (views) + details (keymap) + State (keys)
 /// State of the UI, contains the backend as well
@@ -672,6 +634,12 @@ pub struct Layout {
     pub margins: Margins,
     pub kind: ArrangementKind,
     pub current_view: String,
+
+    // If current view is latched,
+    // clicking any button that emits an action (erase, submit, set modifier)
+    // will cause lock buttons to unlatch.
+    view_latched: LatchedState,
+
     // Views own the actual buttons which have state
     // Maybe they should own UI only,
     // and keys should be owned by a dedicated non-UI-State?
@@ -718,6 +686,7 @@ impl Layout {
         Layout {
             kind,
             current_view: "base".to_owned(),
+            view_latched: LatchedState::Not,
             views: data.views,
             keymaps: data.keymaps,
             pressed_keys: HashSet::new(),
@@ -743,6 +712,12 @@ impl Layout {
         }
     }
 
+    // Layout is passed around mutably,
+    // so better keep the field away from direct access.
+    pub fn get_view_latched(&self) -> &LatchedState {
+        &self.view_latched
+    }
+
     /// Calculates size without margins
     fn calculate_inner_size(&self) -> Size {
         View::calculate_super_size(
@@ -818,8 +793,117 @@ impl Layout {
         }
         out
     }
+    
+    fn apply_view_transition(
+        &mut self,
+        action: &Action,
+    ) {
+        let (transition, new_latched) = Layout::process_action_for_view(
+            action,
+            &self.current_view,
+            &self.view_latched,
+        );
+
+        match transition {
+            ViewTransition::UnlatchAll => self.unstick_locks(),
+            ViewTransition::ChangeTo(view) => try_set_view(self, view.into()),
+            ViewTransition::NoChange => {},
+        };
+
+        self.view_latched = new_latched;
     }
 
+    /// Unlatch all latched keys,
+    /// so that the new view is the one before first press.
+    fn unstick_locks(&mut self) {
+        if let LatchedState::FromView(name) = self.view_latched.clone() {
+            match self.set_view(name.clone()) {
+                Ok(_) => { self.view_latched = LatchedState::Not; }
+                Err(e) => log_print!(
+                    logging::Level::Bug,
+                    "Bad view {}, can't unlatch ({:?})",
+                    name,
+                    e,
+                ),
+            }
+        }
+    }
+
+    /// Last bool is new latch state.
+    /// It doesn't make sense when the result carries UnlatchAll,
+    /// but let's not be picky.
+    ///
+    /// Although the state is not defined at the keys
+    /// (it's in the relationship between view and action),
+    /// keys go through the following stages when clicked repeatedly: 
+    /// unlocked+unlatched -> locked+latched -> locked+unlatched
+    /// -> unlocked+unlatched
+    fn process_action_for_view<'a>(
+        action: &'a Action,
+        current_view: &str,
+        latched: &LatchedState,
+    ) -> (ViewTransition<'a>, LatchedState) {
+        match action {
+            Action::Submit { text: _, keys: _ }
+                | Action::Erase
+                | Action::ApplyModifier(_)
+            => {
+                let t = match latched {
+                    LatchedState::FromView(_) => ViewTransition::UnlatchAll,
+                    LatchedState::Not => ViewTransition::NoChange,
+                };
+                (t, LatchedState::Not)
+            },
+            Action::SetView(view) => (
+                ViewTransition::ChangeTo(view),
+                LatchedState::Not,
+            ),
+            Action::LockView { lock, unlock, latches, looks_locked_from: _ } => {
+                use self::ViewTransition as VT;
+                let locked = action.is_locked(current_view);
+                match (locked, latched, latches) {
+                    // Was unlocked, now make locked but latched.
+                    (false, LatchedState::Not, true) => (
+                        VT::ChangeTo(lock),
+                        LatchedState::FromView(current_view.into()),
+                    ),
+                    // Layout is latched for reason other than this button.
+                    (false, LatchedState::FromView(view), true) => (
+                        VT::ChangeTo(lock),
+                        LatchedState::FromView(view.clone()),
+                    ),
+                    // Was latched, now only locked.
+                    (true, LatchedState::FromView(_), true)
+                        => (VT::NoChange, LatchedState::Not),
+                    // Was unlocked, can't latch so now make fully locked.
+                    (false, _, false)
+                        => (VT::ChangeTo(lock), LatchedState::Not),
+                    // Was locked, now make unlocked.
+                    (true, _, _)
+                        => (VT::ChangeTo(unlock), LatchedState::Not),
+                }
+            },
+            _ => (ViewTransition::NoChange, latched.clone()),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq)]
+enum ViewTransition<'a> {
+    ChangeTo(&'a str),
+    UnlatchAll,
+    NoChange,
+}
+
+fn try_set_view(layout: &mut Layout, view_name: &str) {
+    layout.set_view(view_name.into())
+        .or_print(
+            logging::Problem::Bug,
+            &format!("Bad view {}, ignoring", view_name),
+        );
+}
+
+
 mod procedures {
     use super::*;
 
@@ -898,67 +982,6 @@ pub struct UIBackend {
 mod seat {
     use super::*;
 
-    fn try_set_view(layout: &mut Layout, view_name: String) {
-        layout.set_view(view_name.clone())
-            .or_print(
-                logging::Problem::Bug,
-                &format!("Bad view {}, ignoring", view_name),
-            );
-    }
-
-    /// A vessel holding an obligation to switch view.
-    /// Use with #[must_use]
-    struct ViewChange<'a> {
-        layout: &'a mut Layout,
-        view_name: Option<String>,
-    }
-    
-    impl<'a> ViewChange<'a> {
-        fn choose_view(self, view_name: String) -> ViewChange<'a> {
-            ViewChange {
-                view_name: Some(view_name),
-                ..self
-            }
-        }
-        fn apply(self) {
-            if let Some(name) = self.view_name {
-                try_set_view(self.layout, name);
-            }
-        }
-    }
-
-    /// Find all impermanent view changes and undo them in an arbitrary order.
-    /// Return an obligation to actually switch the view.
-    /// The final view is the "unlock" view
-    /// from one of the currently stuck keys.
-    // As long as only one stuck button is used, this should be fine.
-    // This is guaranteed because pressing a lock button unlocks all others.
-    // TODO: Make some broader guarantee about the resulting view,
-    // e.g. by maintaining a stack of stuck keys.
-    #[must_use]
-    fn unstick_locks(layout: &mut Layout) -> ViewChange {
-        let mut new_view = None;
-        for key in layout.get_locked_keys().clone() {
-            let key: &Rc<RefCell<KeyState>> = key.borrow();
-            let key = RefCell::borrow(key);
-            match &key.action {
-                Action::LockView { lock: _, unlock: view } => {
-                    new_view = Some(view.clone());
-                },
-                a => log_print!(
-                    logging::Level::Bug,
-                    "Non-locking action {:?} was found inside locked keys",
-                    a,
-                ),
-            };
-        }
-        
-        ViewChange {
-            layout,
-            view_name: new_view,
-        }
-    }
-
     pub fn handle_press_key(
         layout: &mut Layout,
         submission: &mut Submission,
@@ -1018,37 +1041,22 @@ mod seat {
         };
         let action = key.action.clone();
 
+        layout.apply_view_transition(&action);
+
         // update
         let key = key.into_released();
 
-        // process changes
+        // process non-view switching
         match action {
             Action::Submit { text: _, keys: _ }
                 | Action::Erase
             => {
-                unstick_locks(layout).apply();
                 submission.handle_release(KeyState::get_id(rckey), time);
             },
-            Action::SetView(view) => {
-                try_set_view(layout, view)
-            },
-            Action::LockView { lock, unlock } => {
-                let gets_locked = !key.action.is_locked(&layout.current_view);
-                unstick_locks(layout)
-                    // It doesn't matter what the resulting view should be,
-                    // it's getting changed anyway.
-                    .choose_view(
-                        match gets_locked {
-                            true => lock.clone(),
-                            false => unlock.clone(),
-                        }
-                    )
-                    .apply()
-            },
             Action::ApplyModifier(modifier) => {
                 // FIXME: key id is unneeded with stateless locks
                 let key_id = KeyState::get_id(rckey);
-                let gets_locked = !submission.is_modifier_active(modifier.clone());
+                let gets_locked = !submission.is_modifier_active(modifier);
                 match gets_locked {
                     true => submission.handle_add_modifier(
                         key_id,
@@ -1083,6 +1091,8 @@ mod seat {
                     }
                 }
             },
+            // Other keys are handled in view switcher before.
+            _ => {}
         };
 
         let pointer = ::util::Pointer(rckey.clone());
@@ -1100,14 +1110,20 @@ mod test {
     use std::ffi::CString;
     use ::keyboard::PressType;
 
-    pub fn make_state() -> Rc<RefCell<::keyboard::KeyState>> {
+    pub fn make_state_with_action(action: Action)
+        -> Rc<RefCell<::keyboard::KeyState>>
+    {
         Rc::new(RefCell::new(::keyboard::KeyState {
             pressed: PressType::Released,
             keycodes: Vec::new(),
-            action: Action::SetView("default".into()),
+            action,
         }))
     }
 
+    pub fn make_state() -> Rc<RefCell<::keyboard::KeyState>> {
+        make_state_with_action(Action::SetView("default".into()))
+    }
+
     pub fn make_button_with_state(
         name: String,
         state: Rc<RefCell<::keyboard::KeyState>>,
@@ -1121,6 +1137,242 @@ mod test {
         })
     }
     
+    #[test]
+    fn latch_lock_unlock() {
+        let action = Action::LockView {
+            lock: "lock".into(),
+            unlock: "unlock".into(),
+            latches: true,
+            looks_locked_from: vec![],
+        };
+
+        assert_eq!(
+            Layout::process_action_for_view(&action, "unlock", &LatchedState::Not),
+            (ViewTransition::ChangeTo("lock"), LatchedState::FromView("unlock".into())),
+        );
+
+        assert_eq!(
+            Layout::process_action_for_view(&action, "lock", &LatchedState::FromView("unlock".into())),
+            (ViewTransition::NoChange, LatchedState::Not),
+        );
+
+        assert_eq!(
+            Layout::process_action_for_view(&action, "lock", &LatchedState::Not),
+            (ViewTransition::ChangeTo("unlock"), LatchedState::Not),
+        );
+
+        assert_eq!(
+            Layout::process_action_for_view(&Action::Erase, "lock", &LatchedState::FromView("base".into())),
+            (ViewTransition::UnlatchAll, LatchedState::Not),
+        );
+    }
+
+    #[test]
+    fn latch_pop_layout() {
+        let switch = Action::LockView {
+            lock: "locked".into(),
+            unlock: "base".into(),
+            latches: true,
+            looks_locked_from: vec![],
+        };
+        
+        let submit = Action::Erase;
+
+        let view = View::new(vec![(
+            0.0,
+            Row::new(vec![
+                (
+                    0.0,
+                    make_button_with_state(
+                        "switch".into(),
+                        make_state_with_action(switch.clone())
+                    ),
+                ),
+                (
+                    1.0,
+                    make_button_with_state(
+                        "submit".into(),
+                        make_state_with_action(submit.clone())
+                    ),
+                ),
+            ]),
+        )]);
+
+        let mut layout = Layout {
+            current_view: "base".into(),
+            view_latched: LatchedState::Not,
+            keymaps: Vec::new(),
+            kind: ArrangementKind::Base,
+            pressed_keys: HashSet::new(),
+            margins: Margins {
+                top: 0.0,
+                left: 0.0,
+                right: 0.0,
+                bottom: 0.0,
+            },
+            views: hashmap! {
+                // Both can use the same structure.
+                // Switching doesn't depend on the view shape
+                // as long as the switching button is present.
+                "base".into() => (c::Point { x: 0.0, y: 0.0 }, view.clone()),
+                "locked".into() => (c::Point { x: 0.0, y: 0.0 }, view),
+            },
+        };        
+
+        // Basic cycle
+        layout.apply_view_transition(&switch);
+        assert_eq!(&layout.current_view, "locked");
+        layout.apply_view_transition(&switch);
+        assert_eq!(&layout.current_view, "locked");
+        layout.apply_view_transition(&submit);
+        assert_eq!(&layout.current_view, "locked");
+        layout.apply_view_transition(&switch);
+        assert_eq!(&layout.current_view, "base");
+        layout.apply_view_transition(&switch);
+        // Unlatch
+        assert_eq!(&layout.current_view, "locked");
+        layout.apply_view_transition(&submit);
+        assert_eq!(&layout.current_view, "base");
+    }
+
+    #[test]
+    fn reverse_unlatch_layout() {
+        let switch = Action::LockView {
+            lock: "locked".into(),
+            unlock: "base".into(),
+            latches: true,
+            looks_locked_from: vec![],
+        };
+        
+        let unswitch = Action::LockView {
+            lock: "locked".into(),
+            unlock: "unlocked".into(),
+            latches: false,
+            looks_locked_from: vec![],
+        };
+        
+        let submit = Action::Erase;
+
+        let view = View::new(vec![(
+            0.0,
+            Row::new(vec![
+                (
+                    0.0,
+                    make_button_with_state(
+                        "switch".into(),
+                        make_state_with_action(switch.clone())
+                    ),
+                ),
+                (
+                    1.0,
+                    make_button_with_state(
+                        "submit".into(),
+                        make_state_with_action(submit.clone())
+                    ),
+                ),
+            ]),
+        )]);
+
+        let mut layout = Layout {
+            current_view: "base".into(),
+            view_latched: LatchedState::Not,
+            keymaps: Vec::new(),
+            kind: ArrangementKind::Base,
+            pressed_keys: HashSet::new(),
+            margins: Margins {
+                top: 0.0,
+                left: 0.0,
+                right: 0.0,
+                bottom: 0.0,
+            },
+            views: hashmap! {
+                // Both can use the same structure.
+                // Switching doesn't depend on the view shape
+                // as long as the switching button is present.
+                "base".into() => (c::Point { x: 0.0, y: 0.0 }, view.clone()),
+                "locked".into() => (c::Point { x: 0.0, y: 0.0 }, view.clone()),
+                "unlocked".into() => (c::Point { x: 0.0, y: 0.0 }, view),
+            },
+        };        
+
+        layout.apply_view_transition(&switch);
+        assert_eq!(&layout.current_view, "locked");
+        layout.apply_view_transition(&unswitch);
+        assert_eq!(&layout.current_view, "unlocked");
+    }
+
+    #[test]
+    fn latch_twopop_layout() {
+        let switch = Action::LockView {
+            lock: "locked".into(),
+            unlock: "base".into(),
+            latches: true,
+            looks_locked_from: vec![],
+        };
+        
+        let switch_again = Action::LockView {
+            lock: "ĄĘ".into(),
+            unlock: "locked".into(),
+            latches: true,
+            looks_locked_from: vec![],
+        };
+        
+        let submit = Action::Erase;
+
+        let view = View::new(vec![(
+            0.0,
+            Row::new(vec![
+                (
+                    0.0,
+                    make_button_with_state(
+                        "switch".into(),
+                        make_state_with_action(switch.clone())
+                    ),
+                ),
+                (
+                    1.0,
+                    make_button_with_state(
+                        "submit".into(),
+                        make_state_with_action(submit.clone())
+                    ),
+                ),
+            ]),
+        )]);
+
+        let mut layout = Layout {
+            current_view: "base".into(),
+            view_latched: LatchedState::Not,
+            keymaps: Vec::new(),
+            kind: ArrangementKind::Base,
+            pressed_keys: HashSet::new(),
+            margins: Margins {
+                top: 0.0,
+                left: 0.0,
+                right: 0.0,
+                bottom: 0.0,
+            },
+            views: hashmap! {
+                // All can use the same structure.
+                // Switching doesn't depend on the view shape
+                // as long as the switching button is present.
+                "base".into() => (c::Point { x: 0.0, y: 0.0 }, view.clone()),
+                "locked".into() => (c::Point { x: 0.0, y: 0.0 }, view.clone()),
+                "ĄĘ".into() => (c::Point { x: 0.0, y: 0.0 }, view),
+            },
+        };        
+
+        // Latch twice, then Ąto-unlatch across 2 levels
+        layout.apply_view_transition(&switch);
+        println!("{:?}", layout.view_latched);
+        assert_eq!(&layout.current_view, "locked");
+        layout.apply_view_transition(&switch_again);
+        println!("{:?}", layout.view_latched);
+        assert_eq!(&layout.current_view, "ĄĘ");
+        layout.apply_view_transition(&submit);
+        println!("{:?}", layout.view_latched);
+        assert_eq!(&layout.current_view, "base");
+    }
+
     #[test]
     fn check_centering() {
         //    A B
@@ -1193,6 +1445,7 @@ mod test {
         ]);
         let layout = Layout {
             current_view: String::new(),
+            view_latched: LatchedState::Not,
             keymaps: Vec::new(),
             kind: ArrangementKind::Base,
             pressed_keys: HashSet::new(),

src/locale.rs

@@ -24,7 +24,6 @@ mod c {
     #[repr(C)]
     pub struct GnomeXkbInfo(*const c_void);
 
-    #[no_mangle]
     extern "C" {
         // from libc
         pub fn strcoll(cs: *const c_char, ct: *const c_char) -> c_int;

src/manager.rs

@@ -9,7 +9,6 @@ pub mod c {
     #[derive(Clone, Copy)]
     pub struct Manager(*const c_void);
     
-    #[no_mangle]
     extern "C" {
         pub fn eekboard_context_service_set_overlay(
             manager: Manager,

src/popover.h

@@ -1,9 +0,0 @@
-#ifndef POPOVER_H__
-#define POPOVER_H__
-
-#include <gtk/gtk.h>
-#include "eek/eek-keyboard.h"
-
-void squeek_popover_show(GtkWidget*, struct button_place);
-
-#endif

src/popover.rs

@@ -29,7 +29,6 @@ use ::logging::Warn;
 mod c {
     use std::os::raw::c_char;
 
-    #[no_mangle]
     extern "C" {
         pub fn popover_open_settings_panel(panel: *const c_char);
     }
@@ -214,7 +213,16 @@ fn set_visible_layout(
     layout_id: LayoutId,
 ) {
     match layout_id {
-        LayoutId::System { kind, name } => set_layout(kind, name),
+        LayoutId::System { kind, name } => {
+            unsafe {
+                use std::ptr;
+                manager::c::eekboard_context_service_set_overlay(
+                    manager,
+                    ptr::null(),
+                );
+            }
+            set_layout(kind, name);
+        }
         LayoutId::Local(name) => {
             let name = CString::new(name.as_str()).unwrap();
             let name_ptr = name.as_ptr();
@@ -437,7 +445,8 @@ pub fn show(
 
         let settings_action = gio::SimpleAction::new("settings", None);
         settings_action.connect_activate(move |_, _| {
-            unsafe { c::popover_open_settings_panel(CString::new("region").unwrap().as_ptr()) };
+            let s = CString::new("region").unwrap();
+            unsafe { c::popover_open_settings_panel(s.as_ptr()) };
         });
 
         let action_group = gio::SimpleActionGroup::new();

src/resources.rs

@@ -39,6 +39,7 @@ const KEYBOARDS: &[(*const str, *const str)] = &[
     ("epo", include_str!("../data/keyboards/epo.yaml")),
 
     ("es", include_str!("../data/keyboards/es.yaml")),
+    ("es+cat", include_str!("../data/keyboards/es+cat.yaml")),
 
     ("fi", include_str!("../data/keyboards/fi.yaml")),
 
@@ -47,6 +48,8 @@ const KEYBOARDS: &[(*const str, *const str)] = &[
 
     ("gr", include_str!("../data/keyboards/gr.yaml")),
 
+    ("il", include_str!("../data/keyboards/il.yaml")),
+    
     ("ir", include_str!("../data/keyboards/ir.yaml")),
     ("ir_wide", include_str!("../data/keyboards/ir_wide.yaml")),
 
@@ -66,19 +69,27 @@ const KEYBOARDS: &[(*const str, *const str)] = &[
     ("se", include_str!("../data/keyboards/se.yaml")),
 
     ("th", include_str!("../data/keyboards/th.yaml")),
+    ("th_wide", include_str!("../data/keyboards/th_wide.yaml")),
 
     ("ua", include_str!("../data/keyboards/ua.yaml")),
 
     ("us+colemak", include_str!("../data/keyboards/us+colemak.yaml")),
+    ("us+colemak_wide", include_str!("../data/keyboards/us+colemak_wide.yaml")),
+
+    ("us+dvorak", include_str!("../data/keyboards/us+dvorak.yaml")),
+    ("us+dvorak_wide", include_str!("../data/keyboards/us+dvorak_wide.yaml")),
 
     // Others
-    ("number", include_str!("../data/keyboards/number.yaml")),
+    ("number/us", include_str!("../data/keyboards/number/us.yaml")),
+
+    // Terminal
+    ("terminal/fr", include_str!("../data/keyboards/terminal/fr.yaml")),
+
+    ("terminal/us", include_str!("../data/keyboards/terminal/us.yaml")),
+    ("terminal/us_wide",   include_str!("../data/keyboards/terminal/us_wide.yaml")),
 
-    // layout+overlay
-    ("terminal", include_str!("../data/keyboards/terminal.yaml")),
-    ("terminal_wide", include_str!("../data/keyboards/terminal_wide.yaml")),
     // Overlays
-    ("emoji", include_str!("../data/keyboards/emoji.yaml")),
+    ("emoji/us", include_str!("../data/keyboards/emoji/us.yaml")),
 ];
 
 pub fn get_keyboard(needle: &str) -> Option<&'static str> {
@@ -114,6 +125,7 @@ const LAYOUT_NAMES: &[(*const str, *const str)] = &[
     ("en-US", include_str!("../data/langs/en-US.txt")),
     ("es-ES", include_str!("../data/langs/es-ES.txt")),
     ("fur-IT", include_str!("../data/langs/fur-IT.txt")),
+    ("he-IL", include_str!("../data/langs/he-IL.txt")),
     ("ja-JP", include_str!("../data/langs/ja-JP.txt")),
     ("pl-PL", include_str!("../data/langs/pl-PL.txt")),
     ("ru-RU", include_str!("../data/langs/ru-RU.txt")),
@@ -160,7 +172,7 @@ mod test {
     #[test]
     fn check_overlays_present() {
         for name in get_overlays() {
-            assert!(get_keyboard(name).is_some());
+            assert!(get_keyboard(&format!("{}/us", name)).is_some());
         }
     }
 

src/server-main.c

@@ -50,9 +50,16 @@ struct squeekboard {
 };
 
 
+GMainLoop *loop;
 static gboolean opt_system = FALSE;
 static gchar *opt_address = NULL;
 
+static void
+quit (void)
+{
+  g_main_loop_quit (loop);
+}
+
 // D-Bus
 
 static void
@@ -131,6 +138,67 @@ static const struct wl_registry_listener registry_listener = {
 #define SESSION_NAME "sm.puri.OSK0"
 
 GDBusProxy *_proxy = NULL;
+GDBusProxy *_client_proxy = NULL;
+gchar      *_client_path = NULL;
+
+
+static void
+send_quit_response (GDBusProxy  *proxy)
+{
+    g_debug ("Calling EndSessionResponse");
+    g_dbus_proxy_call (proxy, "EndSessionResponse",
+        g_variant_new ("(bs)", TRUE, ""), G_DBUS_CALL_FLAGS_NONE,
+        G_MAXINT, NULL, NULL, NULL);
+}
+
+static void
+unregister_client (void)
+{
+    g_autoptr (GError) error = NULL;
+
+    g_return_if_fail (G_IS_DBUS_PROXY (_proxy));
+    g_return_if_fail (_client_path != NULL);
+
+    g_debug ("Unregistering client");
+
+    g_dbus_proxy_call_sync (_proxy,
+			    "UnregisterClient",
+			    g_variant_new ("(o)", _client_path),
+			    G_DBUS_CALL_FLAGS_NONE,
+			    G_MAXINT,
+			    NULL,
+			    &error);
+
+    if (error) {
+        g_warning ("Failed to unregister client: %s", error->message);
+    }
+
+    g_clear_object (&_client_proxy);
+    g_clear_pointer (&_client_path, g_free);
+}
+
+static void client_proxy_signal (GDBusProxy  *proxy,
+				 const gchar *sender_name,
+				 const gchar *signal_name,
+				 GVariant    *parameters,
+				 gpointer     user_data)
+{
+    if (g_str_equal (signal_name, "QueryEndSession")) {
+        g_debug ("Received QueryEndSession");
+        send_quit_response (proxy);
+    } else if (g_str_equal (signal_name, "CancelEndSession")) {
+        g_debug ("Received CancelEndSession");
+    } else if (g_str_equal (signal_name, "EndSession")) {
+        g_debug ("Received EndSession");
+        send_quit_response (proxy);
+        unregister_client ();
+	quit ();
+    } else if (g_str_equal (signal_name, "Stop")) {
+        g_debug ("Received Stop");
+        unregister_client ();
+        quit ();
+    }
+}
 
 static void
 session_register(void) {
@@ -151,7 +219,8 @@ session_register(void) {
         return;
     }
 
-    g_dbus_proxy_call_sync(_proxy, "RegisterClient",
+    g_autoptr (GVariant) res = NULL;
+    res = g_dbus_proxy_call_sync(_proxy, "RegisterClient",
         g_variant_new("(ss)", SESSION_NAME, autostart_id),
         G_DBUS_CALL_FLAGS_NONE, 1000, NULL, &error);
     if (error) {
@@ -160,6 +229,22 @@ session_register(void) {
         g_clear_error(&error);
         return;
     }
+
+    g_variant_get (res, "(o)", &_client_path);
+    g_debug ("Registered client at '%s'", _client_path);
+
+    _client_proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SESSION,
+      0, NULL, "org.gnome.SessionManager", _client_path,
+      "org.gnome.SessionManager.ClientPrivate", NULL, &error);
+    if (error) {
+        g_warning ("Failed to get client proxy: %s", error->message);
+	g_clear_error (&error);
+	g_free (_client_path);
+	_client_path = NULL;
+	return;
+    }
+
+    g_signal_connect (_client_proxy, "g-signal", G_CALLBACK (client_proxy_signal), NULL);
 }
 
 int
@@ -307,8 +392,7 @@ main (int argc, char **argv)
 
     session_register();
 
-    GMainLoop *loop = g_main_loop_new (NULL, FALSE);
+    loop = g_main_loop_new (NULL, FALSE);
-
     g_main_loop_run (loop);
 
     if (connection) {

src/submission.rs

@@ -149,7 +149,7 @@ impl Submission {
                 enum Outcome {
                     Submitted(Result<(), imservice::SubmitError>),
                     NotSubmitted,
-                };
+                }
 
                 let submit_outcome = match data {
                     SubmitData::Text(text) => {
@@ -270,6 +270,7 @@ impl Submission {
             .map(|(_id, m)| match m {
                 Modifier::Control => Modifiers::CONTROL,
                 Modifier::Alt => Modifiers::MOD1,
+                Modifier::Mod4 => Modifiers::MOD4,
             })
             .fold(Modifiers::empty(), |m, n| m | n);
         self.virtual_keyboard.set_modifiers_state(raw_modifiers);

src/tests.rs

@@ -43,7 +43,7 @@ pub fn check_layout_file(path: &str) {
 fn check_sym_in_keymap(state: &xkb::State, sym_name: &str) -> bool {
     let sym = xkb::keysym_from_name(sym_name, xkb::KEYSYM_NO_FLAGS);
     if sym == xkb::KEY_NoSymbol {
-        panic!(format!("Entered invalid keysym: {}", sym_name));
+        panic!("Entered invalid keysym: {}", sym_name);
     }
     let map = state.get_keymap();
     let range = map.min_keycode()..=map.max_keycode();

src/ui_manager.rs

@@ -19,7 +19,6 @@ pub mod c {
     #[repr(transparent)]
     pub struct UIManager(*const c_void);
 
-    #[no_mangle]
     extern "C" {
         pub fn server_context_service_update_visible(imservice: *const UIManager, active: u32);
         pub fn server_context_service_release_visibility(imservice: *const UIManager);

src/vkeyboard.rs

@@ -37,7 +37,6 @@ pub mod c {
         }
     }
 
-    #[no_mangle]
     extern "C" {
         // From libc, to let KeyMap get deallocated.
         fn close(fd: u32);

tests/meson.build

@@ -67,9 +67,11 @@ foreach layout : [
     'dk',
     'epo',
     'es',
+    'es+cat',
     'fi',
     'fr', 'fr_wide',
     'gr',
+    'il',
     'ir',
     'it',
     'it+fur',
@@ -78,17 +80,22 @@ foreach layout : [
     'pl', 'pl_wide',
     'ru',
     'se',
-    'th',
+    'th', 'th_wide',
     'ua',
-    'us+colemak',
+    'us+colemak', 'us+colemak_wide',
+    'us+dvorak', 'us+dvorak_wide',
+
+    # Terminal keyboards
+    'terminal/fr', 
+    'terminal/us',
+    'terminal/us_wide',
     
     # Block: Not languages.
-    'emoji',
+    'emoji/us',
-    'number',
+    'number/us',
-    'terminal', 'terminal_wide',
 ]
     extra = []
-    if layout == 'emoji'
+    if layout.startswith('emoji/')
         extra += ['allow_missing_return']
     endif