UI: Delay hiding only when leaving a text field

src/imservice.rs

@@ -42,7 +42,7 @@ pub mod c {
         pub fn eek_input_method_commit(im: *mut InputMethod, serial: u32);
         fn eekboard_context_service_set_hint_purpose(state: *const StateManager, hint: u32, purpose: u32);
         fn server_context_service_show_keyboard(imservice: *const UIManager);
-        fn server_context_service_hide_keyboard(imservice: *const UIManager);
+        fn server_context_service_keyboard_release_visibility(imservice: *const UIManager);
     }
     
     // The following defined in Rust. TODO: wrap naked pointers to Rust data inside RefCells to prevent multiple writers
@@ -165,7 +165,7 @@ pub mod c {
                 }
             } else {
                 if let Some(ui) = imservice.ui_manager {
-                    unsafe { server_context_service_hide_keyboard(ui); }
+                    unsafe { server_context_service_keyboard_release_visibility(ui); }
                 }
             }
         }
@@ -185,7 +185,7 @@ pub mod c {
         imservice.current.active = false;
 
         if let Some(ui) = imservice.ui_manager {
-            unsafe { server_context_service_hide_keyboard(ui); }
+            unsafe { server_context_service_keyboard_release_visibility(ui); }
         }
     }    
 

src/server-context-service.c

@@ -226,15 +226,6 @@ make_widget (ServerContextService *self)
     gtk_widget_show_all(self->widget);
 }
 
-static gboolean
-on_hide (ServerContextService *self)
-{
-    gtk_widget_hide (GTK_WIDGET(self->window));
-    self->hiding = 0;
-
-    return G_SOURCE_REMOVE;
-}
-
 static void
 server_context_service_real_show_keyboard (ServerContextService *self)
 {
@@ -260,12 +251,19 @@ server_context_service_real_show_keyboard (ServerContextService *self)
 static void
 server_context_service_real_hide_keyboard (ServerContextService *self)
 {
-    if (!self->hiding) {
-        self->hiding = g_timeout_add (200, (GSourceFunc) on_hide, self);
-    }
+    gtk_widget_hide (GTK_WIDGET(self->window));
     self->visible = FALSE;
 }
 
+static gboolean
+on_hide (ServerContextService *self)
+{
+    server_context_service_real_hide_keyboard(self);
+    self->hiding = 0;
+
+    return G_SOURCE_REMOVE;
+}
+
 void
 server_context_service_show_keyboard (ServerContextService *self)
 {
@@ -286,6 +284,22 @@ server_context_service_hide_keyboard (ServerContextService *self)
     }
 }
 
+/// Meant for use by the input-method handler:
+/// the visible keyboard is no longer needed.
+/// The implementation will delay it slightly,
+/// because the release may be due to switching from one text field to another.
+/// In this case, the user doesn't really need the keyboard surface
+/// to disappear completely.
+void
+server_context_service_keyboard_release_visibility (ServerContextService *self)
+{
+    g_return_if_fail (SERVER_IS_CONTEXT_SERVICE(self));
+
+    if (!self->hiding && self->visible) {
+        self->hiding = g_timeout_add (200, (GSourceFunc) on_hide, self);
+    }
+}
+
 static void
 server_context_service_set_property (GObject      *object,
                                      guint         prop_id,