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fl_window_state_monitor.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
5 #include "flutter/shell/platform/linux/fl_window_state_monitor.h"
6
7 #include <gtk/gtk.h>
8
9 #include "flutter/shell/platform/linux/public/flutter_linux/fl_string_codec.h"
10
11 static constexpr const char* kFlutterLifecycleChannel = "flutter/lifecycle";
12
13 static constexpr const char* kAppLifecycleStateResumed =
14 "AppLifecycleState.resumed";
15 static constexpr const char* kAppLifecycleStateInactive =
16 "AppLifecycleState.inactive";
17 static constexpr const char* kAppLifecycleStateHidden =
18 "AppLifecycleState.hidden";
19
20 struct _FlWindowStateMonitor {
21 GObject parent_instance;
22
23 // Messenger to communicate with engine.
24 FlBinaryMessenger* messenger;
25
26 // Window being monitored.
27 GtkWindow* window;
28
29 // Current state information.
30 GdkWindowState window_state;
31
32 // Signal connection ID for window-state-changed
33 gulong window_state_event_cb_id;
34 };
35
36 G_DEFINE_TYPE(FlWindowStateMonitor, fl_window_state_monitor, G_TYPE_OBJECT);
37
38 static void send_lifecycle_state(FlWindowStateMonitor* self,
39 const gchar* lifecycle_state) {
40 g_autoptr(FlValue) value = fl_value_new_string(lifecycle_state);
41 g_autoptr(FlStringCodec) codec = fl_string_codec_new();
42 g_autoptr(GError) error = nullptr;
43 g_autoptr(GBytes) message =
44 fl_message_codec_encode_message(FL_MESSAGE_CODEC(codec), value, &error);
45 if (message == nullptr) {
46 g_warning("Failed to encoding lifecycle state message: %s", error->message);
47 return;
48 }
49
50 fl_binary_messenger_send_on_channel(self->messenger, kFlutterLifecycleChannel,
51 message, nullptr, nullptr, nullptr);
52 }
53
54 static gboolean is_hidden(GdkWindowState state) {
55 return (state & GDK_WINDOW_STATE_WITHDRAWN) ||
56 (state & GDK_WINDOW_STATE_ICONIFIED);
57 }
58
59 // Signal handler for GtkWindow::window-state-event
60 static gboolean window_state_event_cb(FlWindowStateMonitor* self,
61 GdkEvent* event) {
62 GdkWindowState state = event->window_state.new_window_state;
63 GdkWindowState previous_state = self->window_state;
64 self->window_state = state;
65 bool was_visible = !is_hidden(previous_state);
66 bool is_visible = !is_hidden(state);
67 bool was_focused = (previous_state & GDK_WINDOW_STATE_FOCUSED);
68 bool is_focused = (state & GDK_WINDOW_STATE_FOCUSED);
69
70 if (was_visible != is_visible || was_focused != is_focused) {
71 const gchar* lifecycle_state;
72 if (is_visible) {
73 lifecycle_state =
74 is_focused ? kAppLifecycleStateResumed : kAppLifecycleStateInactive;
75 } else {
76 lifecycle_state = kAppLifecycleStateHidden;
77 }
78
79 send_lifecycle_state(self, lifecycle_state);
80 }
81
82 return FALSE;
83 }
84
85 static void fl_window_state_monitor_dispose(GObject* object) {
86 FlWindowStateMonitor* self = FL_WINDOW_STATE_MONITOR(object);
87
88 g_clear_object(&self->messenger);
89 if (self->window_state_event_cb_id != 0) {
90 g_signal_handler_disconnect(self->window, self->window_state_event_cb_id);
91 self->window_state_event_cb_id = 0;
92 }
93
94 G_OBJECT_CLASS(fl_window_state_monitor_parent_class)->dispose(object);
95 }
96
97 static void fl_window_state_monitor_class_init(
98 FlWindowStateMonitorClass* klass) {
99 G_OBJECT_CLASS(klass)->dispose = fl_window_state_monitor_dispose;
100 }
101
102 static void fl_window_state_monitor_init(FlWindowStateMonitor* self) {}
103
104 FlWindowStateMonitor* fl_window_state_monitor_new(FlBinaryMessenger* messenger,
105 GtkWindow* window) {
106 FlWindowStateMonitor* self = FL_WINDOW_STATE_MONITOR(
107 g_object_new(fl_window_state_monitor_get_type(), nullptr));
108 self->messenger = FL_BINARY_MESSENGER(g_object_ref(messenger));
109 self->window = window;
110
111 // Listen to window state changes.
112 self->window_state_event_cb_id =
113 g_signal_connect_swapped(self->window, "window-state-event",
114 G_CALLBACK(window_state_event_cb), self);
115 self->window_state =
116 gdk_window_get_state(gtk_widget_get_window(GTK_WIDGET(self->window)));
117
118 return self;
119 }
state
AtkStateType state
Definition: fl_accessible_node.cc:10
fl_binary_messenger_send_on_channel
G_MODULE_EXPORT void fl_binary_messenger_send_on_channel(FlBinaryMessenger *self, const gchar *channel, GBytes *message, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data)
Definition: fl_binary_messenger.cc:435
fl_message_codec_encode_message
G_MODULE_EXPORT GBytes * fl_message_codec_encode_message(FlMessageCodec *self, FlValue *message, GError **error)
Definition: fl_message_codec.cc:17
error
const uint8_t uint32_t uint32_t GError ** error
Definition: fl_pixel_buffer_texture_test.cc:40
value
uint8_t value
Definition: fl_standard_message_codec.cc:36
fl_string_codec_new
G_MODULE_EXPORT FlStringCodec * fl_string_codec_new()
Definition: fl_string_codec.cc:53
fl_string_codec.h
fl_value_new_string
G_MODULE_EXPORT FlValue * fl_value_new_string(const gchar *value)
Definition: fl_value.cc:276
FlValue
typedefG_BEGIN_DECLS struct _FlValue FlValue
Definition: fl_value.h:42
kAppLifecycleStateHidden
static constexpr const char * kAppLifecycleStateHidden
Definition: fl_window_state_monitor.cc:17
fl_window_state_monitor_dispose
static void fl_window_state_monitor_dispose(GObject *object)
Definition: fl_window_state_monitor.cc:85
is_hidden
static gboolean is_hidden(GdkWindowState state)
Definition: fl_window_state_monitor.cc:54
G_DEFINE_TYPE
G_DEFINE_TYPE(FlWindowStateMonitor, fl_window_state_monitor, G_TYPE_OBJECT)
fl_window_state_monitor_new
FlWindowStateMonitor * fl_window_state_monitor_new(FlBinaryMessenger *messenger, GtkWindow *window)
Definition: fl_window_state_monitor.cc:104
kAppLifecycleStateResumed
static constexpr const char * kAppLifecycleStateResumed
Definition: fl_window_state_monitor.cc:13
kFlutterLifecycleChannel
static constexpr const char * kFlutterLifecycleChannel
Definition: fl_window_state_monitor.cc:11
window_state_event_cb
static gboolean window_state_event_cb(FlWindowStateMonitor *self, GdkEvent *event)
Definition: fl_window_state_monitor.cc:60
fl_window_state_monitor_init
static void fl_window_state_monitor_init(FlWindowStateMonitor *self)
Definition: fl_window_state_monitor.cc:102
fl_window_state_monitor_class_init
static void fl_window_state_monitor_class_init(FlWindowStateMonitorClass *klass)
Definition: fl_window_state_monitor.cc:97
send_lifecycle_state
static void send_lifecycle_state(FlWindowStateMonitor *self, const gchar *lifecycle_state)
Definition: fl_window_state_monitor.cc:38
kAppLifecycleStateInactive
static constexpr const char * kAppLifecycleStateInactive
Definition: fl_window_state_monitor.cc:15
fl_window_state_monitor.h
_FlWindowStateMonitor
Definition: fl_window_state_monitor.cc:20
_FlWindowStateMonitor::window
GtkWindow * window
Definition: fl_window_state_monitor.cc:27
_FlWindowStateMonitor::window_state_event_cb_id
gulong window_state_event_cb_id
Definition: fl_window_state_monitor.cc:33
_FlWindowStateMonitor::parent_instance
GObject parent_instance
Definition: fl_window_state_monitor.cc:21
_FlWindowStateMonitor::window_state
GdkWindowState window_state
Definition: fl_window_state_monitor.cc:30
_FlWindowStateMonitor::messenger
FlBinaryMessenger * messenger
Definition: fl_window_state_monitor.cc:24