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1 // Copyright 2013 The Chromium 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 #ifndef ASH_COMMON_SHELF_SHELF_WINDOW_WATCHER_H_ | |
6 #define ASH_COMMON_SHELF_SHELF_WINDOW_WATCHER_H_ | |
7 | |
8 #include <set> | |
9 | |
10 #include "base/macros.h" | |
11 #include "base/scoped_observer.h" | |
12 #include "ui/aura/window_observer.h" | |
13 #include "ui/display/display_observer.h" | |
14 #include "ui/wm/public/activation_change_observer.h" | |
15 | |
16 namespace ash { | |
17 | |
18 class ShelfModel; | |
19 | |
20 // ShelfWindowWatcher creates and handles a ShelfItem for windows in the default | |
21 // container and panels in the panel container that have a valid ShelfItemType | |
22 // property (e.g. the task manager dialog or the OS settings window). It adds | |
23 // the ShelfItem when the window is added to the default container and maintains | |
24 // it until the window is closed, even if the window is transiently reparented | |
25 // (e.g. during a drag). | |
26 class ShelfWindowWatcher : public aura::client::ActivationChangeObserver, | |
27 public display::DisplayObserver { | |
28 public: | |
29 explicit ShelfWindowWatcher(ShelfModel* model); | |
30 ~ShelfWindowWatcher() override; | |
31 | |
32 private: | |
33 // Observes for windows being added to a root window's default container. | |
34 class ContainerWindowObserver : public aura::WindowObserver { | |
35 public: | |
36 explicit ContainerWindowObserver(ShelfWindowWatcher* window_watcher); | |
37 ~ContainerWindowObserver() override; | |
38 | |
39 private: | |
40 // aura::WindowObserver: | |
41 void OnWindowHierarchyChanged(const HierarchyChangeParams& params) override; | |
42 void OnWindowDestroying(aura::Window* window) override; | |
43 | |
44 ShelfWindowWatcher* window_watcher_; | |
45 | |
46 DISALLOW_COPY_AND_ASSIGN(ContainerWindowObserver); | |
47 }; | |
48 | |
49 // Observes individual user windows to detect when they are closed or when | |
50 // their shelf item properties have changed. | |
51 class UserWindowObserver : public aura::WindowObserver { | |
52 public: | |
53 explicit UserWindowObserver(ShelfWindowWatcher* window_watcher); | |
54 ~UserWindowObserver() override; | |
55 | |
56 private: | |
57 // aura::WindowObserver: | |
58 void OnWindowPropertyChanged(aura::Window* window, | |
59 const void* key, | |
60 intptr_t old) override; | |
61 void OnWindowDestroying(aura::Window* window) override; | |
62 void OnWindowVisibilityChanged(aura::Window* window, bool visible) override; | |
63 void OnWindowTitleChanged(aura::Window* window) override; | |
64 | |
65 ShelfWindowWatcher* window_watcher_; | |
66 | |
67 DISALLOW_COPY_AND_ASSIGN(UserWindowObserver); | |
68 }; | |
69 | |
70 // Creates a ShelfItem for |window|. | |
71 void AddShelfItem(aura::Window* window); | |
72 | |
73 // Removes a ShelfItem for |window|. | |
74 void RemoveShelfItem(aura::Window* window); | |
75 | |
76 // Returns the index of ShelfItem associated with |window|, or -1 if none. | |
77 int GetShelfItemIndexForWindow(aura::Window* window) const; | |
78 | |
79 // Cleans up observers on |container|. | |
80 void OnContainerWindowDestroying(aura::Window* container); | |
81 | |
82 // Adds a shelf item for new windows added to the default container that have | |
83 // a valid ShelfItemType property value. | |
84 void OnUserWindowAdded(aura::Window* window); | |
85 | |
86 // Adds, updates or removes the shelf item based on a property change. | |
87 void OnUserWindowPropertyChanged(aura::Window* window); | |
88 | |
89 // Removes the shelf item when a window closes. | |
90 void OnUserWindowDestroying(aura::Window* window); | |
91 | |
92 // aura::client::ActivationChangeObserver: | |
93 void OnWindowActivated(ActivationReason reason, | |
94 aura::Window* gained_active, | |
95 aura::Window* lost_active) override; | |
96 | |
97 // display::DisplayObserver overrides: | |
98 void OnDisplayAdded(const display::Display& display) override; | |
99 void OnDisplayRemoved(const display::Display& old_display) override; | |
100 void OnDisplayMetricsChanged(const display::Display& display, | |
101 uint32_t metrics) override; | |
102 | |
103 ShelfModel* model_; | |
104 | |
105 ContainerWindowObserver container_window_observer_; | |
106 UserWindowObserver user_window_observer_; | |
107 | |
108 ScopedObserver<aura::Window, ContainerWindowObserver> | |
109 observed_container_windows_; | |
110 ScopedObserver<aura::Window, UserWindowObserver> observed_user_windows_; | |
111 | |
112 // The set of windows with shelf items managed by this ShelfWindowWatcher. | |
113 std::set<aura::Window*> user_windows_with_items_; | |
114 | |
115 DISALLOW_COPY_AND_ASSIGN(ShelfWindowWatcher); | |
116 }; | |
117 | |
118 } // namespace ash | |
119 | |
120 #endif // ASH_COMMON_SHELF_SHELF_WINDOW_WATCHER_H_ | |
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