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1 // Copyright (c) 2012 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_WM_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_ | |
6 #define ASH_COMMON_WM_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_ | |
7 | |
8 #include <memory> | |
9 | |
10 #include "ash/ash_export.h" | |
11 #include "ash/common/wm/wm_types.h" | |
12 #include "ash/common/wm_display_observer.h" | |
13 #include "base/callback.h" | |
14 #include "base/macros.h" | |
15 #include "ui/gfx/geometry/rect.h" | |
16 #include "ui/wm/public/window_move_client.h" | |
17 | |
18 namespace ui { | |
19 class KeyEvent; | |
20 class LocatedEvent; | |
21 class MouseEvent; | |
22 class GestureEvent; | |
23 } | |
24 | |
25 namespace ash { | |
26 | |
27 class WmShell; | |
28 class WmWindow; | |
29 | |
30 namespace wm { | |
31 | |
32 // WmToplevelWindowEventHandler handles dragging and resizing of top level | |
33 // windows. WmToplevelWindowEventHandler is forwarded events, such as from an | |
34 // EventHandler. | |
35 class ASH_EXPORT WmToplevelWindowEventHandler : public WmDisplayObserver { | |
36 public: | |
37 // Describes what triggered ending the drag. | |
38 enum class DragResult { | |
39 // The drag successfully completed. | |
40 SUCCESS, | |
41 | |
42 REVERT, | |
43 | |
44 // The underlying window was destroyed while the drag is in process. | |
45 WINDOW_DESTROYED | |
46 }; | |
47 using EndClosure = base::Callback<void(DragResult)>; | |
48 | |
49 explicit WmToplevelWindowEventHandler(WmShell* shell); | |
50 ~WmToplevelWindowEventHandler() override; | |
51 | |
52 void OnKeyEvent(ui::KeyEvent* event); | |
53 void OnMouseEvent(ui::MouseEvent* event, WmWindow* target); | |
54 void OnGestureEvent(ui::GestureEvent* event, WmWindow* target); | |
55 | |
56 // Attempts to start a drag if one is not already in progress. Returns true if | |
57 // successful. |end_closure| is run when the drag completes. |end_closure| is | |
58 // not run if the drag does not start. | |
59 bool AttemptToStartDrag(WmWindow* window, | |
60 const gfx::Point& point_in_parent, | |
61 int window_component, | |
62 aura::client::WindowMoveSource source, | |
63 const EndClosure& end_closure); | |
64 | |
65 // If there is a drag in progress it is reverted, otherwise does nothing. | |
66 void RevertDrag(); | |
67 | |
68 // Returns true if there is a drag in progress. | |
69 bool is_drag_in_progress() const { return window_resizer_.get() != nullptr; } | |
70 | |
71 private: | |
72 class ScopedWindowResizer; | |
73 | |
74 // Completes or reverts the drag if one is in progress. Returns true if a | |
75 // drag was completed or reverted. | |
76 bool CompleteDrag(DragResult result); | |
77 | |
78 void HandleMousePressed(WmWindow* target, ui::MouseEvent* event); | |
79 void HandleMouseReleased(WmWindow* target, ui::MouseEvent* event); | |
80 | |
81 // Called during a drag to resize/position the window. | |
82 void HandleDrag(WmWindow* target, ui::LocatedEvent* event); | |
83 | |
84 // Called during mouse moves to update window resize shadows. | |
85 void HandleMouseMoved(WmWindow* target, ui::LocatedEvent* event); | |
86 | |
87 // Called for mouse exits to hide window resize shadows. | |
88 void HandleMouseExited(WmWindow* target, ui::LocatedEvent* event); | |
89 | |
90 // Called when mouse capture is lost. | |
91 void HandleCaptureLost(ui::LocatedEvent* event); | |
92 | |
93 // Sets |window|'s state type to |new_state_type|. Called after the drag has | |
94 // been completed for fling gestures. | |
95 void SetWindowStateTypeFromGesture(WmWindow* window, | |
96 wm::WindowStateType new_state_type); | |
97 | |
98 // Invoked from ScopedWindowResizer if the window is destroyed. | |
99 void ResizerWindowDestroyed(); | |
100 | |
101 // WmDisplayObserver: | |
102 void OnDisplayConfigurationChanging() override; | |
103 | |
104 WmShell* shell_; | |
105 | |
106 // The hittest result for the first finger at the time that it initially | |
107 // touched the screen. |first_finger_hittest_| is one of ui/base/hit_test.h | |
108 int first_finger_hittest_; | |
109 | |
110 // The window bounds when the drag was started. When a window is minimized, | |
111 // maximized or snapped via a swipe/fling gesture, the restore bounds should | |
112 // be set to the bounds of the window when the drag was started. | |
113 gfx::Rect pre_drag_window_bounds_; | |
114 | |
115 // Is a window move/resize in progress because of gesture events? | |
116 bool in_gesture_drag_ = false; | |
117 | |
118 std::unique_ptr<ScopedWindowResizer> window_resizer_; | |
119 | |
120 EndClosure end_closure_; | |
121 | |
122 DISALLOW_COPY_AND_ASSIGN(WmToplevelWindowEventHandler); | |
123 }; | |
124 | |
125 } // namespace wm | |
126 } // namespace ash | |
127 | |
128 #endif // ASH_COMMON_WM_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_ | |
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