Mir
legacy_scene_change_notification.h
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1 /*
2  * Copyright © 2014 Canonical Ltd.
3  *
4  * This program is free software: you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License version 3,
6  * as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  *
16  * Authored by: Robert Carr <robert.carr@canonical.com>
17  */
18 
19 #ifndef MIR_SCENE_SIMPLE_OBSERVER_H_
20 #define MIR_SCENE_SIMPLE_OBSERVER_H_
21 
22 #include "mir/scene/observer.h"
23 
24 #include <functional>
25 #include <map>
26 #include <mutex>
27 
28 namespace mir
29 {
30 namespace scene
31 {
32 class SurfaceObserver;
33 
34 // A simple implementation of surface observer which forwards all changes to a provided callback.
35 // Also installs surface observers on each added surface which in turn forward each change to
36 // said callback.
38 {
39 public:
41  std::function<void()> const& scene_notify_change,
42  std::function<void(int)> const& buffer_notify_change);
44 
45  void surface_added(Surface* surface) override;
46  void surface_removed(Surface* surface) override;
47  void surfaces_reordered() override;
48 
49  void scene_changed() override;
50 
51  void surface_exists(Surface* surface) override;
52  void end_observation() override;
53 
54 private:
55  std::function<void()> const scene_notify_change;
56  std::function<void(int)> const buffer_notify_change;
57 
58  std::mutex surface_observers_guard;
59  std::map<Surface*, std::weak_ptr<SurfaceObserver>> surface_observers;
60 
61  void add_surface_observer(Surface* surface);
62 };
63 
64 }
65 } // namespace mir
66 
67 #endif // MIR_SCENE_SIMPLE_OBSERVER_H_
~LegacySceneChangeNotification()
Definition: legacy_scene_change_notification.cpp:37
All things Mir.
Definition: buffer_stream.h:37
LegacySceneChangeNotification(std::function< void()> const &scene_notify_change, std::function< void(int)> const &buffer_notify_change)
Definition: legacy_scene_change_notification.cpp:28
An observer for top level notifications of scene changes. In order to receive more granular change no...
Definition: observer.h:33
void surface_added(Surface *surface) override
Definition: legacy_scene_change_notification.cpp:56
void scene_changed() override
Definition: legacy_scene_change_notification.cpp:85
void surfaces_reordered() override
Definition: legacy_scene_change_notification.cpp:80
void surface_removed(Surface *surface) override
Definition: legacy_scene_change_notification.cpp:66
void end_observation() override
Definition: legacy_scene_change_notification.cpp:90
void surface_exists(Surface *surface) override
Definition: legacy_scene_change_notification.cpp:61
Definition: legacy_scene_change_notification.h:37
Definition: surface.h:40

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