imservice: Handle unavailable message

src/imservice.c

@@ -5,9 +5,6 @@
 #include "eekboard/eekboard-context-service.h"
 
 
-void imservice_handle_unavailable(void *data, struct zwp_input_method_v2 *input_method) {}
-
-
 static const struct zwp_input_method_v2_listener input_method_listener = {
     .activate = imservice_handle_input_method_activate,
     .deactivate = imservice_handle_input_method_deactivate,
@@ -42,3 +39,9 @@ void imservice_try_hide(EekboardContextService *context,
     (void)im;
     eekboard_context_service_hide_keyboard (context);
 }
+
+/// Declared explicitly because _destroy is inline,
+/// making it unavailable in Rust
+void imservice_destroy_im(struct zwp_input_method_v2 *im) {
+    zwp_input_method_v2_destroy(im);
+}

src/imservice.h

@@ -20,5 +20,6 @@ void imservice_handle_surrounding_text(void *data, struct zwp_input_method_v2 *i
 void imservice_handle_commit_state(void *data, struct zwp_input_method_v2 *input_method);
 void imservice_handle_content_type(void *data, struct zwp_input_method_v2 *input_method, uint32_t hint, uint32_t purpose);
 void imservice_handle_text_change_cause(void *data, struct zwp_input_method_v2 *input_method, uint32_t cause);
+void imservice_handle_unavailable(void *data, struct zwp_input_method_v2 *input_method);
 
 #endif

src/imservice.rs

@@ -33,6 +33,7 @@ pub mod c {
     extern "C" {
         fn imservice_make_visible(imservice: *const UIManager);
         fn imservice_try_hide(imservice: *const UIManager);
+        fn imservice_destroy_im(im: *mut c::InputMethod);
         fn eekboard_context_service_set_hint_purpose(imservice: *const UIManager, hint: u32, purpose: u32);
     }
     
@@ -162,6 +163,22 @@ pub mod c {
         }
     }
     
+    #[no_mangle]
+    pub unsafe extern "C"
+    fn imservice_handle_unavailable(imservice: *mut IMService,
+        im: *mut InputMethod)
+    {
+        imservice_destroy_im(im);
+
+        let imservice = &mut *imservice;
+
+        // no need to care about proper double-buffering,
+        // the keyboard is already decommissioned
+        imservice.current.active = false;
+
+        imservice_try_hide(imservice.ui_manager);
+    }
+
     // FIXME: destroy and deallocate
 }