Mir
null_observer.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_NULL_OBSERVER_H_
20 #define MIR_SCENE_NULL_OBSERVER_H_
21 
22 #include "mir/scene/observer.h"
23 
24 namespace mir
25 {
26 namespace scene
27 {
28 class NullObserver : public Observer
29 {
30 public:
31  NullObserver() = default;
32  virtual ~NullObserver() = default;
33 
34  void surface_added(Surface* surface);
35  void surface_removed(Surface* surface);
36  void surfaces_reordered();
37 
38  // Called at observer registration to notify of already existing surfaces.
39  void surface_exists(Surface* surface);
40  // Called when observer is unregistered, for example, to provide a place to
41  // unregister SurfaceObservers which may have been added in surface_added/exists
42  void end_observation();
43 
44 protected:
45  NullObserver(NullObserver const&) = delete;
46  NullObserver& operator=(NullObserver const&) = delete;
47 };
48 }
49 } // namespace mir
50 
51 #endif // MIR_SCENE_NULL_OBSERVER_H_
All things Mir.
Definition: buffer_stream.h:37
void end_observation()
Definition: null_observer.cpp:27
void surface_removed(Surface *surface)
Definition: null_observer.cpp:24
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)
Definition: null_observer.cpp:23
Definition: null_observer.h:28
void surface_exists(Surface *surface)
Definition: null_observer.cpp:26
Definition: surface.h:40
NullObserver & operator=(NullObserver const &)=delete
virtual ~NullObserver()=default
void surfaces_reordered()
Definition: null_observer.cpp:25

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