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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_WORKSPACE_WORKSPACE_WINDOW_RESIZER_H_ | |
6 #define ASH_COMMON_WM_WORKSPACE_WORKSPACE_WINDOW_RESIZER_H_ | |
7 | |
8 #include <stdint.h> | |
9 | |
10 #include <memory> | |
11 #include <vector> | |
12 | |
13 #include "ash/common/wm/window_resizer.h" | |
14 #include "ash/common/wm/workspace/magnetism_matcher.h" | |
15 #include "base/compiler_specific.h" | |
16 #include "base/macros.h" | |
17 #include "base/memory/weak_ptr.h" | |
18 #include "ui/aura/window_tracker.h" | |
19 | |
20 namespace ash { | |
21 class DockedWindowLayoutManager; | |
22 class PhantomWindowController; | |
23 class TwoStepEdgeCycler; | |
24 class WindowSize; | |
25 class WmShell; | |
26 | |
27 namespace wm { | |
28 class WindowState; | |
29 } | |
30 | |
31 // WindowResizer implementation for workspaces. This enforces that windows are | |
32 // not allowed to vertically move or resize outside of the work area. As windows | |
33 // are moved outside the work area they are shrunk. We remember the height of | |
34 // the window before it was moved so that if the window is again moved up we | |
35 // attempt to restore the old height. | |
36 class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer { | |
37 public: | |
38 // When dragging an attached window this is the min size we'll make sure is | |
39 // visible. In the vertical direction we take the max of this and that from | |
40 // the delegate. | |
41 static const int kMinOnscreenSize; | |
42 | |
43 // Min height we'll force on screen when dragging the caption. | |
44 // TODO: this should come from a property on the window. | |
45 static const int kMinOnscreenHeight; | |
46 | |
47 // Snap region when dragging close to the edges. That is, as the window gets | |
48 // this close to an edge of the screen it snaps to the edge. | |
49 static const int kScreenEdgeInset; | |
50 | |
51 // Distance in pixels that the cursor must move past an edge for a window | |
52 // to move or resize beyond that edge. | |
53 static const int kStickyDistancePixels; | |
54 | |
55 ~WorkspaceWindowResizer() override; | |
56 | |
57 static WorkspaceWindowResizer* Create( | |
58 wm::WindowState* window_state, | |
59 const std::vector<WmWindow*>& attached_windows); | |
60 | |
61 // WindowResizer: | |
62 void Drag(const gfx::Point& location_in_parent, int event_flags) override; | |
63 void CompleteDrag() override; | |
64 void RevertDrag() override; | |
65 | |
66 private: | |
67 friend class WorkspaceWindowResizerTest; | |
68 | |
69 // The edge to which the window should be snapped at the end of the drag. | |
70 enum SnapType { SNAP_LEFT, SNAP_RIGHT, SNAP_NONE }; | |
71 | |
72 WorkspaceWindowResizer(wm::WindowState* window_state, | |
73 const std::vector<WmWindow*>& attached_windows); | |
74 | |
75 // Lays out the attached windows. |bounds| is the bounds of the main window. | |
76 void LayoutAttachedWindows(gfx::Rect* bounds); | |
77 | |
78 // Calculates the new sizes of the attached windows, given that the main | |
79 // window has been resized (along the primary axis) by |delta|. | |
80 // |available_size| is the maximum length of the space that the attached | |
81 // windows are allowed to occupy (ie: the distance between the right/bottom | |
82 // edge of the primary window and the right/bottom of the desktop area). | |
83 // Populates |sizes| with the desired sizes of the attached windows, and | |
84 // returns the number of pixels that couldn't be allocated to the attached | |
85 // windows (due to min/max size constraints). | |
86 // Note the return value can be positive or negative, a negative value | |
87 // indicating that that many pixels couldn't be removed from the attached | |
88 // windows. | |
89 int CalculateAttachedSizes(int delta, | |
90 int available_size, | |
91 std::vector<int>* sizes) const; | |
92 | |
93 // Divides |amount| evenly between |sizes|. If |amount| is negative it | |
94 // indicates how many pixels |sizes| should be shrunk by. | |
95 // Returns how many pixels failed to be allocated/removed from |sizes|. | |
96 int GrowFairly(int amount, std::vector<WindowSize>* sizes) const; | |
97 | |
98 // Calculate the ratio of pixels that each WindowSize in |sizes| should | |
99 // receive when growing or shrinking. | |
100 void CalculateGrowthRatios(const std::vector<WindowSize*>& sizes, | |
101 std::vector<float>* out_ratios) const; | |
102 | |
103 // Adds a WindowSize to |sizes| for each attached window. | |
104 void CreateBucketsForAttached(std::vector<WindowSize>* sizes) const; | |
105 | |
106 // If possible snaps the window to a neary window. Updates |bounds| if there | |
107 // was a close enough window. | |
108 void MagneticallySnapToOtherWindows(gfx::Rect* bounds); | |
109 | |
110 // If possible snaps the resize to a neary window. Updates |bounds| if there | |
111 // was a close enough window. | |
112 void MagneticallySnapResizeToOtherWindows(gfx::Rect* bounds); | |
113 | |
114 // Finds the neareset window to magentically snap to. Updates | |
115 // |magnetism_window_| and |magnetism_edge_| appropriately. |edges| is a | |
116 // bitmask of the MagnetismEdges to match again. Returns true if a match is | |
117 // found. | |
118 bool UpdateMagnetismWindow(const gfx::Rect& bounds, uint32_t edges); | |
119 | |
120 // Adjusts the bounds of the window: magnetically snapping, ensuring the | |
121 // window has enough on screen... |snap_size| is the distance from an edge of | |
122 // the work area before the window is snapped. A value of 0 results in no | |
123 // snapping. | |
124 void AdjustBoundsForMainWindow(int snap_size, gfx::Rect* bounds); | |
125 | |
126 // Stick the window bounds to the work area during a move. | |
127 bool StickToWorkAreaOnMove(const gfx::Rect& work_area, | |
128 int sticky_size, | |
129 gfx::Rect* bounds) const; | |
130 | |
131 // Stick the window bounds to the work area during a resize. | |
132 void StickToWorkAreaOnResize(const gfx::Rect& work_area, | |
133 int sticky_size, | |
134 gfx::Rect* bounds) const; | |
135 | |
136 // Returns a coordinate along the primary axis. Used to share code for | |
137 // left/right multi window resize and top/bottom resize. | |
138 int PrimaryAxisSize(const gfx::Size& size) const; | |
139 int PrimaryAxisCoordinate(int x, int y) const; | |
140 | |
141 // Updates the bounds of the phantom window for window snapping. | |
142 void UpdateSnapPhantomWindow(const gfx::Point& location, | |
143 const gfx::Rect& bounds); | |
144 | |
145 // Restacks the windows z-order position so that one of the windows is at the | |
146 // top of the z-order, and the rest directly underneath it. | |
147 void RestackWindows(); | |
148 | |
149 // Returns the edge to which the window should be snapped to if the user does | |
150 // no more dragging. SNAP_NONE is returned if the window should not be | |
151 // snapped. | |
152 SnapType GetSnapType(const gfx::Point& location) const; | |
153 | |
154 // Returns true if |bounds_in_parent| are valid bounds for snapped state type | |
155 // |snapped_type|. | |
156 bool AreBoundsValidSnappedBounds(wm::WindowStateType snapped_type, | |
157 const gfx::Rect& bounds_in_parent) const; | |
158 | |
159 // Docks or undocks the dragged window. | |
160 void SetDraggedWindowDocked(bool should_dock); | |
161 | |
162 wm::WindowState* window_state() { return window_state_; } | |
163 | |
164 const std::vector<WmWindow*> attached_windows_; | |
165 | |
166 WmShell* shell_; | |
167 | |
168 // Returns the currently used instance for test. | |
169 static WorkspaceWindowResizer* GetInstanceForTest(); | |
170 | |
171 bool did_lock_cursor_; | |
172 | |
173 // Set to true once Drag() is invoked and the bounds of the window change. | |
174 bool did_move_or_resize_; | |
175 | |
176 // True if the window initially had |bounds_changed_by_user_| set in state. | |
177 bool initial_bounds_changed_by_user_; | |
178 | |
179 // The initial size of each of the windows in |attached_windows_| along the | |
180 // primary axis. | |
181 std::vector<int> initial_size_; | |
182 | |
183 // Sum of the minimum sizes of the attached windows. | |
184 int total_min_; | |
185 | |
186 // Sum of the sizes in |initial_size_|. | |
187 int total_initial_size_; | |
188 | |
189 // Gives a previews of where the the window will end up. Only used if there | |
190 // is a grid and the caption is being dragged. | |
191 std::unique_ptr<PhantomWindowController> snap_phantom_window_controller_; | |
192 | |
193 // Used to determine whether the window should be snapped or docked when | |
194 // the user drags a window to the edge of the screen. | |
195 std::unique_ptr<TwoStepEdgeCycler> edge_cycler_; | |
196 | |
197 // The edge to which the window should be snapped to at the end of the drag. | |
198 SnapType snap_type_; | |
199 | |
200 // Number of mouse moves since the last bounds change. Only used for phantom | |
201 // placement to track when the mouse is moved while pushed against the edge of | |
202 // the screen. | |
203 int num_mouse_moves_since_bounds_change_; | |
204 | |
205 // The mouse location passed to Drag(). | |
206 gfx::Point last_mouse_location_; | |
207 | |
208 // Window the drag has magnetically attached to. | |
209 WmWindow* magnetism_window_; | |
210 | |
211 // Used to verify |magnetism_window_| is still valid. | |
212 aura::WindowTracker window_tracker_; | |
213 | |
214 // If |magnetism_window_| is non-NULL this indicates how the two windows | |
215 // should attach. | |
216 MatchedEdge magnetism_edge_; | |
217 | |
218 // Dock container window layout manager. | |
219 DockedWindowLayoutManager* dock_layout_; | |
220 | |
221 // Used to determine if this has been deleted during a drag such as when a tab | |
222 // gets dragged into another browser window. | |
223 base::WeakPtrFactory<WorkspaceWindowResizer> weak_ptr_factory_; | |
224 | |
225 DISALLOW_COPY_AND_ASSIGN(WorkspaceWindowResizer); | |
226 }; | |
227 | |
228 } // namespace ash | |
229 | |
230 #endif // ASH_COMMON_WM_WORKSPACE_WORKSPACE_WINDOW_RESIZER_H_ | |
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