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_WINDOW_RESIZER_H_
6 #define ASH_WM_WINDOW_RESIZER_H_
8 #include "ash/ash_export.h"
9 #include "base/basictypes.h"
10 #include "base/memory/scoped_ptr.h"
11 #include "ui/aura/client/window_move_client.h"
12 #include "ui/gfx/rect.h"
23 // WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving
24 // or resizing a window. All coordinates passed to this are in the parent
25 // windows coordinates.
26 class ASH_EXPORT WindowResizer {
28 // Constants to identify the type of resize.
29 static const int kBoundsChange_None;
30 static const int kBoundsChange_Repositions;
31 static const int kBoundsChange_Resizes;
33 // Used to indicate which direction the resize occurs in.
34 static const int kBoundsChangeDirection_None;
35 static const int kBoundsChangeDirection_Horizontal;
36 static const int kBoundsChangeDirection_Vertical;
39 virtual ~WindowResizer();
41 // Returns a bitmask of the kBoundsChange_ values.
42 static int GetBoundsChangeForWindowComponent(int component);
44 // Invoked to drag/move/resize the window. |location| is in the coordinates
45 // of the window supplied to the constructor. |event_flags| is the event
46 // flags from the event.
47 virtual void Drag(const gfx::Point& location, int event_flags) = 0;
49 // Invoked to complete the drag.
50 virtual void CompleteDrag(int event_flags) = 0;
53 virtual void RevertDrag() = 0;
55 // Returns the target window the resizer was created for.
56 virtual aura::Window* GetTarget() = 0;
58 // See comment for |Details::initial_location_in_parent|.
59 virtual const gfx::Point& GetInitialLocation() const = 0;
64 Details(aura::Window* window,
65 const gfx::Point& location,
67 aura::client::WindowMoveSource source);
70 // The window we're resizing.
71 // TODO(oshima): replace this with accessor method to
72 // |window_state->window()|.
75 // The ash window state for the |window| above.
76 wm::WindowState* window_state;
78 // Initial bounds of the window in parent coordinates.
79 gfx::Rect initial_bounds_in_parent;
81 // Restore bounds (in screen coordinates) of the window before the drag
82 // started. Only set if the window is normal and is being dragged.
83 gfx::Rect restore_bounds;
85 // Location passed to the constructor, in |window->parent()|'s coordinates.
86 gfx::Point initial_location_in_parent;
88 // Initial opacity of the window.
89 float initial_opacity;
91 // The component the user pressed on.
94 // Bitmask of the |kBoundsChange_| constants.
97 // Bitmask of the |kBoundsChangeDirection_| constants.
98 int position_change_direction;
100 // Bitmask of the |kBoundsChangeDirection_| constants.
101 int size_change_direction;
103 // Will the drag actually modify the window?
106 // Source of the event initiating the drag.
107 aura::client::WindowMoveSource source;
110 static gfx::Rect CalculateBoundsForDrag(const Details& details,
111 const gfx::Point& location);
113 static gfx::Rect AdjustBoundsToGrid(const gfx::Rect& bounds,
116 static bool IsBottomEdge(int component);
119 // In case of touch resizing, adjusts deltas so that the border is positioned
120 // just under the touch point.
121 static void AdjustDeltaForTouchResize(const Details& details,
125 // Returns the new origin of the window. The arguments are the difference
126 // between the current location and the initial location.
127 static gfx::Point GetOriginForDrag(const Details& details,
131 // Returns the size of the window for the drag.
132 static gfx::Size GetSizeForDrag(const Details& details,
136 // Returns the width of the window.
137 static int GetWidthForDrag(const Details& details,
141 // Returns the height of the drag.
142 static int GetHeightForDrag(const Details& details,
147 // Creates a WindowResizer for |window|. This can return a scoped_ptr
148 // initialized with NULL if |window| should not be resized nor dragged.
149 ASH_EXPORT scoped_ptr<WindowResizer> CreateWindowResizer(
150 aura::Window* window,
151 const gfx::Point& point_in_parent,
152 int window_component,
153 aura::client::WindowMoveSource source);
157 #endif // ASH_WM_WINDOW_RESIZER_H_