Move FlKeyboardManager and FlKeyboardHandler from FlView to FlEngine. (#161925)

There can only be one handler that is shared between the views.

Move event redispatch matcher back into FlKeyboardManager - if a
redispatched event was moved between views due to a focus change it
would not be matched against.

engine/src/flutter/shell/platform/linux/fl_engine.cc

@@ -14,6 +14,7 @@
 #include "flutter/shell/platform/linux/fl_dart_project_private.h"
 #include "flutter/shell/platform/linux/fl_display_monitor.h"
 #include "flutter/shell/platform/linux/fl_engine_private.h"
+#include "flutter/shell/platform/linux/fl_keyboard_handler.h"
 #include "flutter/shell/platform/linux/fl_pixel_buffer_texture_private.h"
 #include "flutter/shell/platform/linux/fl_platform_handler.h"
 #include "flutter/shell/platform/linux/fl_plugin_registrar_private.h"
@@ -57,6 +58,12 @@ struct _FlEngine {
   // Implements the flutter/platform channel.
   FlPlatformHandler* platform_handler;
 
+  // Process keyboard events.
+  FlKeyboardManager* keyboard_manager;
+
+  // Implements the flutter/keyboard channel.
+  FlKeyboardHandler* keyboard_handler;
+
   // Implements the flutter/mousecursor channel.
   FlMouseCursorHandler* mouse_cursor_handler;
 
@@ -381,6 +388,14 @@ static void fl_engine_update_semantics_cb(const FlutterSemanticsUpdate2* update,
   }
 }
 
+static void setup_keyboard(FlEngine* self) {
+  g_clear_object(&self->keyboard_manager);
+  self->keyboard_manager = fl_keyboard_manager_new(self);
+  g_clear_object(&self->keyboard_handler);
+  self->keyboard_handler =
+      fl_keyboard_handler_new(self->binary_messenger, self->keyboard_manager);
+}
+
 // Called right before the engine is restarted.
 //
 // This method should reset states to as if the engine has just been started,
@@ -389,6 +404,8 @@ static void fl_engine_update_semantics_cb(const FlutterSemanticsUpdate2* update,
 static void fl_engine_on_pre_engine_restart_cb(void* user_data) {
   FlEngine* self = FL_ENGINE(user_data);
 
+  setup_keyboard(self);
+
   g_signal_emit(self, fl_engine_signals[SIGNAL_ON_PRE_ENGINE_RESTART], 0);
 }
 
@@ -455,6 +472,8 @@ static void fl_engine_dispose(GObject* object) {
   g_clear_object(&self->binary_messenger);
   g_clear_object(&self->settings_handler);
   g_clear_object(&self->platform_handler);
+  g_clear_object(&self->keyboard_manager);
+  g_clear_object(&self->keyboard_handler);
   g_clear_object(&self->mouse_cursor_handler);
   g_clear_object(&self->task_runner);
 
@@ -646,6 +665,8 @@ gboolean fl_engine_start(FlEngine* self, GError** error) {
   self->mouse_cursor_handler =
       fl_mouse_cursor_handler_new(self->binary_messenger);
 
+  setup_keyboard(self);
+
   result = self->embedder_api.UpdateSemanticsEnabled(self->engine, TRUE);
   if (result != kSuccess) {
     g_warning("Failed to enable accessibility features on Flutter engine");
@@ -1238,6 +1259,11 @@ void fl_engine_request_app_exit(FlEngine* self) {
   fl_platform_handler_request_app_exit(self->platform_handler);
 }
 
+FlKeyboardManager* fl_engine_get_keyboard_manager(FlEngine* self) {
+  g_return_val_if_fail(FL_IS_ENGINE(self), nullptr);
+  return self->keyboard_manager;
+}
+
 FlMouseCursorHandler* fl_engine_get_mouse_cursor_handler(FlEngine* self) {
   g_return_val_if_fail(FL_IS_ENGINE(self), nullptr);
   return self->mouse_cursor_handler;

engine/src/flutter/shell/platform/linux/fl_engine_private.h

@@ -9,6 +9,7 @@
 
 #include "flutter/shell/platform/embedder/embedder.h"
 #include "flutter/shell/platform/linux/fl_display_monitor.h"
+#include "flutter/shell/platform/linux/fl_keyboard_manager.h"
 #include "flutter/shell/platform/linux/fl_mouse_cursor_handler.h"
 #include "flutter/shell/platform/linux/fl_renderer.h"
 #include "flutter/shell/platform/linux/fl_task_runner.h"
@@ -563,6 +564,16 @@ void fl_engine_update_accessibility_features(FlEngine* engine, int32_t flags);
  */
 void fl_engine_request_app_exit(FlEngine* engine);
 
+/**
+ * fl_engine_get_keyboard_manager:
+ * @engine: an #FlEngine.
+ *
+ * Gets the keyboard manager used by this engine.
+ *
+ * Returns: a #FlKeyboardManager.
+ */
+FlKeyboardManager* fl_engine_get_keyboard_manager(FlEngine* engine);
+
 /**
  * fl_engine_get_mouse_cursor_handler:
  * @engine: an #FlEngine.

engine/src/flutter/shell/platform/linux/fl_keyboard_manager.cc

@@ -95,6 +95,9 @@ struct _FlKeyboardManager {
   FlKeyboardManagerGetPressedStateHandler get_pressed_state_handler;
   gpointer get_pressed_state_handler_user_data;
 
+  // Key events that have been redispatched.
+  GPtrArray* redispatched_key_events;
+
   FlKeyEmbedderResponder* key_embedder_responder;
 
   FlKeyChannelResponder* key_channel_responder;
@@ -126,6 +129,25 @@ struct _FlKeyboardManager {
 
 G_DEFINE_TYPE(FlKeyboardManager, fl_keyboard_manager, G_TYPE_OBJECT);
 
+static gboolean event_is_redispatched(FlKeyboardManager* self,
+                                      FlKeyEvent* event) {
+  guint32 time = fl_key_event_get_time(event);
+  gboolean is_press = !!fl_key_event_get_is_press(event);
+  guint16 keycode = fl_key_event_get_keycode(event);
+  for (guint i = 0; i < self->redispatched_key_events->len; i++) {
+    FlKeyEvent* e =
+        FL_KEY_EVENT(g_ptr_array_index(self->redispatched_key_events, i));
+    if (fl_key_event_get_time(e) == time &&
+        !!fl_key_event_get_is_press(e) == is_press &&
+        fl_key_event_get_keycode(e) == keycode) {
+      g_ptr_array_remove_index(self->redispatched_key_events, i);
+      return TRUE;
+    }
+  }
+
+  return FALSE;
+}
+
 static void keymap_keys_changed_cb(FlKeyboardManager* self) {
   g_clear_object(&self->derived_layout);
   self->derived_layout = fl_keyboard_layout_new();
@@ -292,6 +314,7 @@ static void fl_keyboard_manager_dispose(GObject* object) {
   self->keycode_to_goals.reset();
   self->logical_to_mandatory_goals.reset();
 
+  g_clear_pointer(&self->redispatched_key_events, g_ptr_array_unref);
   g_clear_object(&self->key_embedder_responder);
   g_clear_object(&self->key_channel_responder);
   g_clear_object(&self->derived_layout);
@@ -309,6 +332,8 @@ static void fl_keyboard_manager_class_init(FlKeyboardManagerClass* klass) {
 }
 
 static void fl_keyboard_manager_init(FlKeyboardManager* self) {
+  self->redispatched_key_events =
+      g_ptr_array_new_with_free_func(g_object_unref);
   self->derived_layout = fl_keyboard_layout_new();
 
   self->keycode_to_goals =
@@ -383,6 +408,13 @@ FlKeyboardManager* fl_keyboard_manager_new(FlEngine* engine) {
   return self;
 }
 
+void fl_keyboard_manager_add_redispatched_event(FlKeyboardManager* self,
+                                                FlKeyEvent* event) {
+  g_return_if_fail(FL_IS_KEYBOARD_MANAGER(self));
+
+  g_ptr_array_add(self->redispatched_key_events, g_object_ref(event));
+}
+
 void fl_keyboard_manager_handle_event(FlKeyboardManager* self,
                                       FlKeyEvent* event,
                                       GCancellable* cancellable,
@@ -399,6 +431,14 @@ void fl_keyboard_manager_handle_event(FlKeyboardManager* self,
       task, handle_event_data_new(event),
       reinterpret_cast<GDestroyNotify>(handle_event_data_free));
 
+  if (event_is_redispatched(self, event)) {
+    HandleEventData* data =
+        static_cast<HandleEventData*>(g_task_get_task_data(task));
+    data->handled = TRUE;
+    g_task_return_boolean(task, TRUE);
+    return;
+  }
+
   uint64_t specified_logical_key = fl_keyboard_layout_get_logical_key(
       self->derived_layout, fl_key_event_get_group(event),
       fl_key_event_get_keycode(event));

engine/src/flutter/shell/platform/linux/fl_keyboard_manager.h

@@ -45,6 +45,16 @@ G_DECLARE_FINAL_TYPE(FlKeyboardManager,
  */
 FlKeyboardManager* fl_keyboard_manager_new(FlEngine* engine);
 
+/** fl_keyboard_manager_add_redispatched_event:
+ * @manager: an #FlKeyboardManager.
+ * @event: an event that will be handled by the manager in the future.
+ *
+ * Add an event that will be redispatched and handled by the manager in the
+ * future. When that event is received it will be ignored.
+ */
+void fl_keyboard_manager_add_redispatched_event(FlKeyboardManager* manager,
+                                                FlKeyEvent* event);
+
 /**
  * fl_keyboard_manager_handle_event:
  * @manager: an #FlKeyboardManager.

engine/src/flutter/shell/platform/linux/fl_view.cc

@@ -13,8 +13,6 @@
 #include "flutter/shell/platform/linux/fl_accessible_node.h"
 #include "flutter/shell/platform/linux/fl_engine_private.h"
 #include "flutter/shell/platform/linux/fl_key_event.h"
-#include "flutter/shell/platform/linux/fl_keyboard_handler.h"
-#include "flutter/shell/platform/linux/fl_keyboard_manager.h"
 #include "flutter/shell/platform/linux/fl_plugin_registrar_private.h"
 #include "flutter/shell/platform/linux/fl_pointer_manager.h"
 #include "flutter/shell/platform/linux/fl_renderer_gdk.h"
@@ -64,14 +62,7 @@ struct _FlView {
   // Manages touch events.
   FlTouchManager* touch_manager;
 
-  // Manages keyboard events.
-  FlKeyboardManager* keyboard_manager;
-
-  // Key events that have been redispatched.
-  GPtrArray* redispatched_key_events;
-
   // Flutter system channel handlers.
-  FlKeyboardHandler* keyboard_handler;
   FlTextInputHandler* text_input_handler;
 
   // Accessible tree from Flutter, exposed as an AtkPlug.
@@ -134,12 +125,6 @@ static void init_keyboard(FlView* self) {
   g_clear_object(&self->text_input_handler);
   self->text_input_handler = fl_text_input_handler_new(
       messenger, im_context, FL_TEXT_INPUT_VIEW_DELEGATE(self));
-  g_clear_object(&self->keyboard_manager);
-  self->keyboard_manager = fl_keyboard_manager_new(self->engine);
-  g_ptr_array_set_size(self->redispatched_key_events, 0);
-  g_clear_object(&self->keyboard_handler);
-  self->keyboard_handler =
-      fl_keyboard_handler_new(messenger, self->keyboard_manager);
 }
 
 static void init_scrolling(FlView* self) {
@@ -345,8 +330,8 @@ static void sync_modifier_if_needed(FlView* self, GdkEvent* event) {
   guint event_time = gdk_event_get_time(event);
   GdkModifierType event_state = static_cast<GdkModifierType>(0);
   gdk_event_get_state(event, &event_state);
-  fl_keyboard_manager_sync_modifier_if_needed(self->keyboard_manager,
-                                              event_state, event_time);
+  fl_keyboard_manager_sync_modifier_if_needed(
+      fl_engine_get_keyboard_manager(self->engine), event_state, event_time);
 }
 
 static void set_scrolling_position(FlView* self, gdouble x, gdouble y) {
@@ -642,9 +627,6 @@ static void fl_view_dispose(GObject* object) {
   g_clear_object(&self->scrolling_manager);
   g_clear_object(&self->pointer_manager);
   g_clear_object(&self->touch_manager);
-  g_clear_object(&self->keyboard_manager);
-  g_clear_pointer(&self->redispatched_key_events, g_ptr_array_unref);
-  g_clear_object(&self->keyboard_handler);
   g_clear_object(&self->view_accessible);
   g_clear_object(&self->cancellable);
 
@@ -661,34 +643,12 @@ static void fl_view_realize(GtkWidget* widget) {
   gtk_widget_realize(GTK_WIDGET(self->gl_area));
 }
 
-static gboolean event_is_redispatched(FlView* self, FlKeyEvent* event) {
-  guint32 time = fl_key_event_get_time(event);
-  gboolean is_press = !!fl_key_event_get_is_press(event);
-  guint16 keycode = fl_key_event_get_keycode(event);
-  for (guint i = 0; i < self->redispatched_key_events->len; i++) {
-    FlKeyEvent* e =
-        FL_KEY_EVENT(g_ptr_array_index(self->redispatched_key_events, i));
-    if (fl_key_event_get_time(e) == time &&
-        !!fl_key_event_get_is_press(e) == is_press &&
-        fl_key_event_get_keycode(e) == keycode) {
-      g_ptr_array_remove_index(self->redispatched_key_events, i);
-      return TRUE;
-    }
-  }
-
-  return FALSE;
-}
-
 static gboolean handle_key_event(FlView* self, GdkEventKey* key_event) {
   g_autoptr(FlKeyEvent) event = fl_key_event_new_from_gdk_event(
       gdk_event_copy(reinterpret_cast<GdkEvent*>(key_event)));
 
-  if (event_is_redispatched(self, event)) {
-    return FALSE;
-  }
-
   fl_keyboard_manager_handle_event(
-      self->keyboard_manager, event, self->cancellable,
+      fl_engine_get_keyboard_manager(self->engine), event, self->cancellable,
       [](GObject* object, GAsyncResult* result, gpointer user_data) {
         FlView* self = FL_VIEW(user_data);
 
@@ -707,8 +667,8 @@ static gboolean handle_key_event(FlView* self, GdkEventKey* key_event) {
         if (redispatch_event != nullptr) {
           if (!fl_text_input_handler_filter_keypress(self->text_input_handler,
                                                      redispatch_event)) {
-            g_ptr_array_add(self->redispatched_key_events,
-                            g_object_ref(redispatch_event));
+            fl_keyboard_manager_add_redispatched_event(
+                fl_engine_get_keyboard_manager(self->engine), redispatch_event);
             gdk_event_put(fl_key_event_get_origin(redispatch_event));
           }
         }
@@ -761,9 +721,6 @@ static void fl_view_init(FlView* self) {
       .red = 0.0, .green = 0.0, .blue = 0.0, .alpha = 1.0};
   self->background_color = gdk_rgba_copy(&default_background);
 
-  self->redispatched_key_events =
-      g_ptr_array_new_with_free_func(g_object_unref);
-
   GtkWidget* event_box = gtk_event_box_new();
   gtk_widget_set_hexpand(event_box, TRUE);
   gtk_widget_set_vexpand(event_box, TRUE);