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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_WINDOW_RESIZER_H_ | |
6 #define ASH_COMMON_WM_WINDOW_RESIZER_H_ | |
7 | |
8 #include <memory> | |
9 | |
10 #include "ash/ash_export.h" | |
11 #include "ash/common/wm/drag_details.h" | |
12 #include "ash/common/wm/window_state.h" | |
13 #include "base/macros.h" | |
14 #include "ui/wm/public/window_move_client.h" | |
15 | |
16 namespace gfx { | |
17 class Rect; | |
18 } | |
19 | |
20 namespace ash { | |
21 | |
22 class WmWindow; | |
23 | |
24 // WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving | |
25 // or resizing a window. All coordinates passed to this are in the parent | |
26 // windows coordinates. | |
27 class ASH_EXPORT WindowResizer { | |
28 public: | |
29 // Constants to identify the type of resize. | |
30 static const int kBoundsChange_None; | |
31 static const int kBoundsChange_Repositions; | |
32 static const int kBoundsChange_Resizes; | |
33 | |
34 // Used to indicate which direction the resize occurs in. | |
35 static const int kBoundsChangeDirection_None; | |
36 static const int kBoundsChangeDirection_Horizontal; | |
37 static const int kBoundsChangeDirection_Vertical; | |
38 | |
39 explicit WindowResizer(wm::WindowState* window_state); | |
40 virtual ~WindowResizer(); | |
41 | |
42 // Returns a bitmask of the kBoundsChange_ values. | |
43 static int GetBoundsChangeForWindowComponent(int component); | |
44 | |
45 // Returns a bitmask of the kBoundsChange_ values. | |
46 static int GetPositionChangeDirectionForWindowComponent(int window_component); | |
47 | |
48 // Invoked to drag/move/resize the window. |location| is in the coordinates | |
49 // of the window supplied to the constructor. |event_flags| is the event | |
50 // flags from the event. | |
51 virtual void Drag(const gfx::Point& location, int event_flags) = 0; | |
52 | |
53 // Invoked to complete the drag. | |
54 virtual void CompleteDrag() = 0; | |
55 | |
56 // Reverts the drag. | |
57 virtual void RevertDrag() = 0; | |
58 | |
59 // Returns the target window the resizer was created for. | |
60 WmWindow* GetTarget() const { | |
61 return window_state_ ? window_state_->window() : nullptr; | |
62 } | |
63 // See comment for |DragDetails::initial_location_in_parent|. | |
64 const gfx::Point& GetInitialLocation() const { | |
65 return window_state_->drag_details()->initial_location_in_parent; | |
66 } | |
67 | |
68 // Drag parameters established when drag starts. | |
69 const DragDetails& details() const { return *window_state_->drag_details(); } | |
70 | |
71 protected: | |
72 gfx::Rect CalculateBoundsForDrag(const gfx::Point& location); | |
73 | |
74 static bool IsBottomEdge(int component); | |
75 | |
76 // WindowState of the drag target. | |
77 wm::WindowState* window_state_; | |
78 | |
79 private: | |
80 // In case of touch resizing, adjusts deltas so that the border is positioned | |
81 // just under the touch point. | |
82 void AdjustDeltaForTouchResize(int* delta_x, int* delta_y); | |
83 | |
84 // Returns the new origin of the window. The arguments are the difference | |
85 // between the current location and the initial location. | |
86 gfx::Point GetOriginForDrag(int delta_x, int delta_y); | |
87 | |
88 // Returns the size of the window for the drag. | |
89 gfx::Size GetSizeForDrag(int* delta_x, int* delta_y); | |
90 | |
91 // Returns the width of the window. | |
92 int GetWidthForDrag(int min_width, int* delta_x); | |
93 | |
94 // Returns the height of the drag. | |
95 int GetHeightForDrag(int min_height, int* delta_y); | |
96 | |
97 DISALLOW_COPY_AND_ASSIGN(WindowResizer); | |
98 }; | |
99 | |
100 // Creates a WindowResizer for |window|. Returns a unique_ptr with null if | |
101 // |window| should not be resized nor dragged. | |
102 ASH_EXPORT std::unique_ptr<WindowResizer> CreateWindowResizer( | |
103 WmWindow* window, | |
104 const gfx::Point& point_in_parent, | |
105 int window_component, | |
106 aura::client::WindowMoveSource source); | |
107 | |
108 } // namespace ash | |
109 | |
110 #endif // ASH_COMMON_WM_WINDOW_RESIZER_H_ | |
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