Flutter Linux Embedder
fl_platform_plugin.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
6 
7 #include <gtk/gtk.h>
8 #include <cstring>
9 
12 
13 static constexpr char kChannelName[] = "flutter/platform";
14 static constexpr char kBadArgumentsError[] = "Bad Arguments";
15 static constexpr char kUnknownClipboardFormatError[] =
16  "Unknown Clipboard Format";
17 static constexpr char kInProgressError[] = "In Progress";
18 static constexpr char kGetClipboardDataMethod[] = "Clipboard.getData";
19 static constexpr char kSetClipboardDataMethod[] = "Clipboard.setData";
20 static constexpr char kClipboardHasStringsMethod[] = "Clipboard.hasStrings";
21 static constexpr char kExitApplicationMethod[] = "System.exitApplication";
22 static constexpr char kRequestAppExitMethod[] = "System.requestAppExit";
23 static constexpr char kInitializationCompleteMethod[] =
24  "System.initializationComplete";
25 static constexpr char kPlaySoundMethod[] = "SystemSound.play";
26 static constexpr char kSystemNavigatorPopMethod[] = "SystemNavigator.pop";
27 static constexpr char kTextKey[] = "text";
28 static constexpr char kValueKey[] = "value";
29 
30 static constexpr char kExitTypeKey[] = "type";
31 static constexpr char kExitTypeCancelable[] = "cancelable";
32 static constexpr char kExitTypeRequired[] = "required";
33 
34 static constexpr char kExitResponseKey[] = "response";
35 static constexpr char kExitResponseCancel[] = "cancel";
36 static constexpr char kExitResponseExit[] = "exit";
37 
38 static constexpr char kTextPlainFormat[] = "text/plain";
39 
40 static constexpr char kSoundTypeAlert[] = "SystemSoundType.alert";
41 static constexpr char kSoundTypeClick[] = "SystemSoundType.click";
42 
44  GObject parent_instance;
45 
46  FlMethodChannel* channel;
48  GCancellable* cancellable;
50 };
51 
52 G_DEFINE_TYPE(FlPlatformPlugin, fl_platform_plugin, G_TYPE_OBJECT)
53 
54 // Sends the method call response to Flutter.
55 static void send_response(FlMethodCall* method_call,
56  FlMethodResponse* response) {
57  g_autoptr(GError) error = nullptr;
58  if (!fl_method_call_respond(method_call, response, &error)) {
59  g_warning("Failed to send method call response: %s", error->message);
60  }
61 }
62 
63 // Called when clipboard text received.
64 static void clipboard_text_cb(GtkClipboard* clipboard,
65  const gchar* text,
66  gpointer user_data) {
67  g_autoptr(FlMethodCall) method_call = FL_METHOD_CALL(user_data);
68 
69  g_autoptr(FlValue) result = nullptr;
70  if (text != nullptr) {
73  }
74 
75  g_autoptr(FlMethodResponse) response =
76  FL_METHOD_RESPONSE(fl_method_success_response_new(result));
77  send_response(method_call, response);
78 }
79 
80 // Called when clipboard text received during has_strings.
81 static void clipboard_text_has_strings_cb(GtkClipboard* clipboard,
82  const gchar* text,
83  gpointer user_data) {
84  g_autoptr(FlMethodCall) method_call = FL_METHOD_CALL(user_data);
85 
86  g_autoptr(FlValue) result = fl_value_new_map();
89  fl_value_new_bool(text != nullptr && strlen(text) > 0));
90 
91  g_autoptr(FlMethodResponse) response =
92  FL_METHOD_RESPONSE(fl_method_success_response_new(result));
93  send_response(method_call, response);
94 }
95 
96 // Called when Flutter wants to copy to the clipboard.
97 static FlMethodResponse* clipboard_set_data(FlPlatformPlugin* self,
98  FlValue* args) {
100  return FL_METHOD_RESPONSE(fl_method_error_response_new(
101  kBadArgumentsError, "Argument map missing or malformed", nullptr));
102  }
103 
105  if (text_value == nullptr ||
106  fl_value_get_type(text_value) != FL_VALUE_TYPE_STRING) {
107  return FL_METHOD_RESPONSE(fl_method_error_response_new(
108  kBadArgumentsError, "Missing clipboard text", nullptr));
109  }
110 
111  GtkClipboard* clipboard =
112  gtk_clipboard_get_default(gdk_display_get_default());
113  gtk_clipboard_set_text(clipboard, fl_value_get_string(text_value), -1);
114 
115  return FL_METHOD_RESPONSE(fl_method_success_response_new(nullptr));
116 }
117 
118 // Called when Flutter wants to paste from the clipboard.
119 static FlMethodResponse* clipboard_get_data_async(FlPlatformPlugin* self,
120  FlMethodCall* method_call) {
122 
124  return FL_METHOD_RESPONSE(fl_method_error_response_new(
125  kBadArgumentsError, "Expected string", nullptr));
126  }
127 
128  const gchar* format = fl_value_get_string(args);
129  if (strcmp(format, kTextPlainFormat) != 0) {
130  return FL_METHOD_RESPONSE(fl_method_error_response_new(
131  kUnknownClipboardFormatError, "GTK clipboard API only supports text",
132  nullptr));
133  }
134 
135  GtkClipboard* clipboard =
136  gtk_clipboard_get_default(gdk_display_get_default());
137  gtk_clipboard_request_text(clipboard, clipboard_text_cb,
138  g_object_ref(method_call));
139 
140  // Will respond later.
141  return nullptr;
142 }
143 
144 // Called when Flutter wants to know if the content of the clipboard is able to
145 // be pasted, without actually accessing the clipboard content itself.
146 static FlMethodResponse* clipboard_has_strings_async(
147  FlPlatformPlugin* self,
148  FlMethodCall* method_call) {
149  GtkClipboard* clipboard =
150  gtk_clipboard_get_default(gdk_display_get_default());
151  gtk_clipboard_request_text(clipboard, clipboard_text_has_strings_cb,
152  g_object_ref(method_call));
153 
154  // Will respond later.
155  return nullptr;
156 }
157 
158 // Get the exit response from a System.requestAppExit method call.
159 static gchar* get_exit_response(FlMethodResponse* response) {
160  if (response == nullptr) {
161  return nullptr;
162  }
163 
164  g_autoptr(GError) error = nullptr;
166  if (result == nullptr) {
167  g_warning("Error returned from System.requestAppExit: %s", error->message);
168  return nullptr;
169  }
171  g_warning("System.requestAppExit result argument map missing or malformed");
172  return nullptr;
173  }
174 
176  if (fl_value_get_type(response_value) != FL_VALUE_TYPE_STRING) {
177  g_warning("Invalid response from System.requestAppExit");
178  return nullptr;
179  }
180  return g_strdup(fl_value_get_string(response_value));
181 }
182 
183 // Quit this application
184 static void quit_application() {
185  GApplication* app = g_application_get_default();
186  if (app == nullptr) {
187  // Unable to gracefully quit, so just exit the process.
188  exit(0);
189  }
190 
191  // GtkApplication windows contain a reference back to the application.
192  // Break them so the application object can cleanup.
193  // See https://gitlab.gnome.org/GNOME/gtk/-/issues/6190
194  if (GTK_IS_APPLICATION(app)) {
195  GList* windows = gtk_application_get_windows(GTK_APPLICATION(app));
196  for (GList* link = windows; link != NULL; link = link->next) {
197  GtkWidget* window = GTK_WIDGET(link->data);
198  gtk_window_set_application(GTK_WINDOW(window), NULL);
199  }
200  }
201 
202  g_application_quit(app);
203 }
204 
205 // Handle response of System.requestAppExit.
206 static void request_app_exit_response_cb(GObject* object,
207  GAsyncResult* result,
208  gpointer user_data) {
209  FlPlatformPlugin* self = FL_PLATFORM_PLUGIN(user_data);
210 
211  g_autoptr(GError) error = nullptr;
212  g_autoptr(FlMethodResponse) method_response =
213  fl_method_channel_invoke_method_finish(FL_METHOD_CHANNEL(object), result,
214  &error);
215  g_autofree gchar* exit_response = nullptr;
216  if (method_response == nullptr) {
217  if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
218  return;
219  }
220  g_warning("Failed to complete System.requestAppExit: %s", error->message);
221  } else {
222  exit_response = get_exit_response(method_response);
223  }
224  // If something went wrong, then just exit.
225  if (exit_response == nullptr) {
226  exit_response = g_strdup(kExitResponseExit);
227  }
228 
229  if (g_str_equal(exit_response, kExitResponseExit)) {
231  } else if (g_str_equal(exit_response, kExitResponseCancel)) {
232  // Canceled - no action to take.
233  }
234 
235  // If request was due to a request from Flutter, pass result back.
236  if (self->exit_application_method_call != nullptr) {
237  g_autoptr(FlValue) exit_result = fl_value_new_map();
239  fl_value_new_string(exit_response));
240  g_autoptr(FlMethodResponse) exit_response =
241  FL_METHOD_RESPONSE(fl_method_success_response_new(exit_result));
242  if (!fl_method_call_respond(self->exit_application_method_call,
243  exit_response, &error)) {
244  g_warning("Failed to send response to System.exitApplication: %s",
245  error->message);
246  }
247  g_clear_object(&self->exit_application_method_call);
248  }
249 }
250 
251 // Send a request to Flutter to exit the application, but only if it's ready for
252 // a request.
253 static void request_app_exit(FlPlatformPlugin* self, const char* type) {
254  g_autoptr(FlValue) args = fl_value_new_map();
255  if (!self->app_initialization_complete ||
256  g_str_equal(type, kExitTypeRequired)) {
258  return;
259  }
260 
263  self->cancellable,
265 }
266 
267 // Called when the Dart app has finished initialization and is ready to handle
268 // requests. For the Flutter framework, this means after the ServicesBinding has
269 // been initialized and it sends a System.initializationComplete message.
270 static FlMethodResponse* system_intitialization_complete(
271  FlPlatformPlugin* self,
272  FlMethodCall* method_call) {
273  self->app_initialization_complete = TRUE;
274  return FL_METHOD_RESPONSE(fl_method_success_response_new(nullptr));
275 }
276 
277 // Called when Flutter wants to exit the application.
278 static FlMethodResponse* system_exit_application(FlPlatformPlugin* self,
279  FlMethodCall* method_call) {
282  return FL_METHOD_RESPONSE(fl_method_error_response_new(
283  kBadArgumentsError, "Argument map missing or malformed", nullptr));
284  }
285 
287  if (type_value == nullptr ||
288  fl_value_get_type(type_value) != FL_VALUE_TYPE_STRING) {
289  return FL_METHOD_RESPONSE(fl_method_error_response_new(
290  kBadArgumentsError, "Missing type argument", nullptr));
291  }
292  const char* type = fl_value_get_string(type_value);
293 
294  // Save method call to respond to when our request to Flutter completes.
295  if (self->exit_application_method_call != nullptr) {
296  return FL_METHOD_RESPONSE(fl_method_error_response_new(
297  kInProgressError, "Request already in progress", nullptr));
298  }
299  self->exit_application_method_call =
300  FL_METHOD_CALL(g_object_ref(method_call));
301 
302  // Requested to immediately quit if the app hasn't yet signaled that it is
303  // ready to handle requests, or if the type of exit requested is "required".
304  if (!self->app_initialization_complete ||
305  g_str_equal(type, kExitTypeRequired)) {
307  g_autoptr(FlValue) exit_result = fl_value_new_map();
310  return FL_METHOD_RESPONSE(fl_method_success_response_new(exit_result));
311  }
312 
313  // Send the request back to Flutter to follow the standard process.
314  request_app_exit(self, type);
315 
316  // Will respond later.
317  return nullptr;
318 }
319 
320 // Called when Flutter wants to play a sound.
321 static FlMethodResponse* system_sound_play(FlPlatformPlugin* self,
322  FlValue* args) {
324  return FL_METHOD_RESPONSE(fl_method_error_response_new(
325  kBadArgumentsError, "Expected string", nullptr));
326  }
327 
328  const gchar* type = fl_value_get_string(args);
329  if (strcmp(type, kSoundTypeAlert) == 0) {
330  GdkDisplay* display = gdk_display_get_default();
331  if (display != nullptr) {
332  gdk_display_beep(display);
333  }
334  } else if (strcmp(type, kSoundTypeClick) == 0) {
335  // We don't make sounds for keyboard on desktops.
336  } else {
337  g_warning("Ignoring unknown sound type %s in SystemSound.play.\n", type);
338  }
339 
340  return FL_METHOD_RESPONSE(fl_method_success_response_new(nullptr));
341 }
342 
343 // Called when Flutter wants to quit the application.
344 static FlMethodResponse* system_navigator_pop(FlPlatformPlugin* self) {
346  return FL_METHOD_RESPONSE(fl_method_success_response_new(nullptr));
347 }
348 
349 // Called when a method call is received from Flutter.
350 static void method_call_cb(FlMethodChannel* channel,
351  FlMethodCall* method_call,
352  gpointer user_data) {
353  FlPlatformPlugin* self = FL_PLATFORM_PLUGIN(user_data);
354 
355  const gchar* method = fl_method_call_get_name(method_call);
357 
358  g_autoptr(FlMethodResponse) response = nullptr;
359  if (strcmp(method, kSetClipboardDataMethod) == 0) {
360  response = clipboard_set_data(self, args);
361  } else if (strcmp(method, kGetClipboardDataMethod) == 0) {
362  response = clipboard_get_data_async(self, method_call);
363  } else if (strcmp(method, kClipboardHasStringsMethod) == 0) {
364  response = clipboard_has_strings_async(self, method_call);
365  } else if (strcmp(method, kExitApplicationMethod) == 0) {
366  response = system_exit_application(self, method_call);
367  } else if (strcmp(method, kInitializationCompleteMethod) == 0) {
369  } else if (strcmp(method, kPlaySoundMethod) == 0) {
370  response = system_sound_play(self, args);
371  } else if (strcmp(method, kSystemNavigatorPopMethod) == 0) {
372  response = system_navigator_pop(self);
373  } else {
374  response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());
375  }
376 
377  if (response != nullptr) {
378  send_response(method_call, response);
379  }
380 }
381 
382 static void fl_platform_plugin_dispose(GObject* object) {
383  FlPlatformPlugin* self = FL_PLATFORM_PLUGIN(object);
384 
385  g_cancellable_cancel(self->cancellable);
386 
387  g_clear_object(&self->channel);
388  g_clear_object(&self->exit_application_method_call);
389  g_clear_object(&self->cancellable);
390 
391  G_OBJECT_CLASS(fl_platform_plugin_parent_class)->dispose(object);
392 }
393 
394 static void fl_platform_plugin_class_init(FlPlatformPluginClass* klass) {
395  G_OBJECT_CLASS(klass)->dispose = fl_platform_plugin_dispose;
396 }
397 
398 static void fl_platform_plugin_init(FlPlatformPlugin* self) {
399  self->cancellable = g_cancellable_new();
400 }
401 
402 FlPlatformPlugin* fl_platform_plugin_new(FlBinaryMessenger* messenger) {
403  g_return_val_if_fail(FL_IS_BINARY_MESSENGER(messenger), nullptr);
404 
405  FlPlatformPlugin* self =
406  FL_PLATFORM_PLUGIN(g_object_new(fl_platform_plugin_get_type(), nullptr));
407 
408  g_autoptr(FlJsonMethodCodec) codec = fl_json_method_codec_new();
409  self->channel =
410  fl_method_channel_new(messenger, kChannelName, FL_METHOD_CODEC(codec));
412  nullptr);
413  self->app_initialization_complete = FALSE;
414 
415  return self;
416 }
417 
418 void fl_platform_plugin_request_app_exit(FlPlatformPlugin* self) {
419  g_return_if_fail(FL_IS_PLATFORM_PLUGIN(self));
420  // Request a cancellable exit.
422 }
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static void clipboard_text_cb(GtkClipboard *clipboard, const gchar *text, gpointer user_data)
Definition: fl_platform_plugin.cc:64
kInProgressError
static constexpr char kInProgressError[]
Definition: fl_platform_plugin.cc:17
clipboard_has_strings_async
static FlMethodResponse * clipboard_has_strings_async(FlPlatformPlugin *self, FlMethodCall *method_call)
Definition: fl_platform_plugin.cc:146
kExitTypeKey
static constexpr char kExitTypeKey[]
Definition: fl_platform_plugin.cc:30
fl_platform_plugin.h
fl_method_call_get_args
G_MODULE_EXPORT FlValue * fl_method_call_get_args(FlMethodCall *self)
Definition: fl_method_call.cc:72
format
uint32_t uint32_t * format
Definition: fl_texture_registrar_test.cc:41
fl_json_method_codec.h
fl_value_new_string
G_MODULE_EXPORT FlValue * fl_value_new_string(const gchar *value)
Definition: fl_value.cc:276
kSoundTypeClick
static constexpr char kSoundTypeClick[]
Definition: fl_platform_plugin.cc:41
request_app_exit
static void request_app_exit(FlPlatformPlugin *self, const char *type)
Definition: fl_platform_plugin.cc:253
kSetClipboardDataMethod
static constexpr char kSetClipboardDataMethod[]
Definition: fl_platform_plugin.cc:19