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.
5 #ifndef ASH_WM_WORKSPACE_WINDOW_RESIZER_H_
6 #define ASH_WM_WORKSPACE_WINDOW_RESIZER_H_
10 #include "ash/wm/window_resizer.h"
11 #include "ash/wm/workspace/magnetism_matcher.h"
12 #include "ash/wm/workspace/snap_types.h"
13 #include "base/compiler_specific.h"
14 #include "base/gtest_prod_util.h"
15 #include "base/memory/scoped_ptr.h"
16 #include "base/memory/weak_ptr.h"
17 #include "ui/aura/window_tracker.h"
26 class DockedWindowLayoutManager;
27 class PhantomWindowController;
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 {
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
41 static const int kMinOnscreenSize;
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;
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;
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;
55 virtual ~WorkspaceWindowResizer();
57 static WorkspaceWindowResizer* Create(
58 wm::WindowState* window_state,
59 const std::vector<aura::Window*>& attached_windows);
62 virtual void Drag(const gfx::Point& location_in_parent,
63 int event_flags) OVERRIDE;
64 virtual void CompleteDrag() OVERRIDE;
65 virtual void RevertDrag() OVERRIDE;
68 WorkspaceWindowResizer(wm::WindowState* window_state,
69 const std::vector<aura::Window*>& attached_windows);
72 friend class WorkspaceWindowResizerTest;
74 // Lays out the attached windows. |bounds| is the bounds of the main window.
75 void LayoutAttachedWindows(gfx::Rect* bounds);
77 // Calculates the new sizes of the attached windows, given that the main
78 // window has been resized (along the primary axis) by |delta|.
79 // |available_size| is the maximum length of the space that the attached
80 // windows are allowed to occupy (ie: the distance between the right/bottom
81 // edge of the primary window and the right/bottom of the desktop area).
82 // Populates |sizes| with the desired sizes of the attached windows, and
83 // returns the number of pixels that couldn't be allocated to the attached
84 // windows (due to min/max size constraints).
85 // Note the return value can be positive or negative, a negative value
86 // indicating that that many pixels couldn't be removed from the attached
88 int CalculateAttachedSizes(
91 std::vector<int>* sizes) const;
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;
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;
103 // Adds a WindowSize to |sizes| for each attached window.
104 void CreateBucketsForAttached(std::vector<WindowSize>* sizes) const;
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);
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);
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
118 bool UpdateMagnetismWindow(const gfx::Rect& bounds, uint32 edges);
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
124 void AdjustBoundsForMainWindow(int snap_size, gfx::Rect* bounds);
126 // Stick the window bounds to the work area during a move.
127 bool StickToWorkAreaOnMove(const gfx::Rect& work_area,
129 gfx::Rect* bounds) const;
131 // Stick the window bounds to the work area during a resize.
132 void StickToWorkAreaOnResize(const gfx::Rect& work_area,
134 gfx::Rect* bounds) const;
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;
141 // Updates the bounds of the phantom window for window snapping.
142 void UpdateSnapPhantomWindow(const gfx::Point& location,
143 const gfx::Rect& bounds);
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();
149 // Returns the SnapType for the specified point. SNAP_NONE is used if no
150 // snapping should be used.
151 SnapType GetSnapType(const gfx::Point& location) const;
153 // Returns true if |bounds_in_parent| are valid bounds for snapped show type
155 bool AreBoundsValidSnappedBounds(wm::WindowShowType snapped_type,
156 const gfx::Rect& bounds_in_parent) const;
158 // Docks or undocks the dragged window.
159 void SetDraggedWindowDocked(bool should_dock);
161 wm::WindowState* window_state() { return window_state_; }
163 const std::vector<aura::Window*> attached_windows_;
165 bool did_lock_cursor_;
167 // Set to true once Drag() is invoked and the bounds of the window change.
168 bool did_move_or_resize_;
170 // True if the window initially had |bounds_changed_by_user_| set in state.
171 bool initial_bounds_changed_by_user_;
173 // The initial size of each of the windows in |attached_windows_| along the
175 std::vector<int> initial_size_;
177 // Sum of the minimum sizes of the attached windows.
180 // Sum of the sizes in |initial_size_|.
181 int total_initial_size_;
183 // Gives a previews of where the the window will end up. Only used if there
184 // is a grid and the caption is being dragged.
185 scoped_ptr<PhantomWindowController> snap_phantom_window_controller_;
187 // Used to determine the target position of a snap.
188 scoped_ptr<SnapSizer> snap_sizer_;
193 // Number of mouse moves since the last bounds change. Only used for phantom
194 // placement to track when the mouse is moved while pushed against the edge of
196 int num_mouse_moves_since_bounds_change_;
198 // The mouse location passed to Drag().
199 gfx::Point last_mouse_location_;
201 // Window the drag has magnetically attached to.
202 aura::Window* magnetism_window_;
204 // Used to verify |magnetism_window_| is still valid.
205 aura::WindowTracker window_tracker_;
207 // If |magnetism_window_| is non-NULL this indicates how the two windows
209 MatchedEdge magnetism_edge_;
211 // Dock container window layout manager.
212 DockedWindowLayoutManager* dock_layout_;
214 // Used to determine if this has been deleted during a drag such as when a tab
215 // gets dragged into another browser window.
216 base::WeakPtrFactory<WorkspaceWindowResizer> weak_ptr_factory_;
218 // Current instance for use by the WorkspaceWindowResizerTest.
219 static WorkspaceWindowResizer* instance_;
221 DISALLOW_COPY_AND_ASSIGN(WorkspaceWindowResizer);
224 } // namespace internal
227 #endif // ASH_WM_WORKSPACE_WINDOW_RESIZER_H_