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Side by Side Diff: ash/wm/common/window_positioner.h

Issue 2030593002: Renames ash/wm/common into ash/common/wm (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 6 months ago
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1 // Copyright 2013 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_WM_COMMON_WINDOW_POSITIONER_H_
6 #define ASH_WM_COMMON_WINDOW_POSITIONER_H_
7
8 #include "ash/ash_export.h"
9 #include "base/macros.h"
10 #include "ui/base/ui_base_types.h"
11
12 namespace display {
13 class Display;
14 }
15
16 namespace gfx {
17 class Rect;
18 }
19
20 namespace ash {
21 namespace wm {
22 class WmGlobals;
23 class WmWindow;
24 }
25
26 namespace test {
27 class WindowPositionerTest;
28 }
29
30 // WindowPositioner is used by the browser to move new popups automatically to
31 // a usable position on the closest work area (of the active window).
32 class ASH_EXPORT WindowPositioner {
33 public:
34 // When the screen resolution width is smaller then this size, The algorithm
35 // will default to maximized.
36 static int GetForceMaximizedWidthLimit();
37
38 // The number of pixels which are kept free top, left and right when a window
39 // gets positioned to its default location.
40 static const int kDesktopBorderSize;
41
42 // Maximum width of a window even if there is more room on the desktop.
43 static const int kMaximumWindowWidth;
44
45 // Computes and returns the bounds and show state for new window
46 // based on the parameter passed AND existing windows. |window| is
47 // the one this function will generate a bounds for and used to
48 // exclude the self window in making decision how to position the
49 // window. |window| can be (and in most case) NULL.
50 // |is_saved_bounds| indicates the |bounds_in_out| is the saved
51 // bounds.
52 static void GetBoundsAndShowStateForNewWindow(
53 const wm::WmWindow* new_window,
54 bool is_saved_bounds,
55 ui::WindowShowState show_state_in,
56 gfx::Rect* bounds_in_out,
57 ui::WindowShowState* show_state_out);
58
59 // Returns the default bounds for a window to be created in the |display|.
60 static gfx::Rect GetDefaultWindowBounds(const display::Display& display);
61
62 // Check if after removal or hide of the given |removed_window| an
63 // automated desktop location management can be performed and
64 // rearrange accordingly.
65 static void RearrangeVisibleWindowOnHideOrRemove(
66 const wm::WmWindow* removed_window);
67
68 // Turn the automatic positioning logic temporarily off. Returns the previous
69 // state.
70 static bool DisableAutoPositioning(bool ignore);
71
72 // Check if after insertion or showing of the given |added_window|
73 // an automated desktop location management can be performed and
74 // rearrange accordingly.
75 static void RearrangeVisibleWindowOnShow(wm::WmWindow* added_window);
76
77 explicit WindowPositioner(wm::WmGlobals* globals);
78 ~WindowPositioner();
79
80 // Find a suitable screen position for a popup window and return it. The
81 // passed input position is only used to retrieve the width and height.
82 // The position is determined on the left / right / top / bottom first. If
83 // no smart space is found, the position will follow the standard what other
84 // operating systems do (default cascading style).
85 gfx::Rect GetPopupPosition(const gfx::Rect& old_pos);
86
87 // Accessor to set a flag indicating whether the first window in ASH should
88 // be maximized.
89 static void SetMaximizeFirstWindow(bool maximize);
90
91 protected:
92 friend class test::WindowPositionerTest;
93
94 // Find a smart way to position the popup window. If there is no space this
95 // function will return an empty rectangle.
96 gfx::Rect SmartPopupPosition(const gfx::Rect& old_pos,
97 const gfx::Rect& work_area,
98 int grid);
99
100 // Find the next available cascading popup position (on the given screen).
101 gfx::Rect NormalPopupPosition(const gfx::Rect& old_pos,
102 const gfx::Rect& work_area);
103
104 // Align the location to the grid / snap to the right / bottom corner.
105 gfx::Rect AlignPopupPosition(const gfx::Rect& pos,
106 const gfx::Rect& work_area,
107 int grid);
108
109 // Constant exposed for unittest.
110 static const int kMinimumWindowOffset;
111
112 wm::WmGlobals* globals_;
113
114 // The offset in X and Y for the next popup which opens.
115 int pop_position_offset_increment_x;
116 int pop_position_offset_increment_y;
117
118 // The position on the screen for the first popup which gets shown if no
119 // empty space can be found.
120 int popup_position_offset_from_screen_corner_x;
121 int popup_position_offset_from_screen_corner_y;
122
123 // The last used position.
124 int last_popup_position_x_;
125 int last_popup_position_y_;
126
127 DISALLOW_COPY_AND_ASSIGN(WindowPositioner);
128 };
129
130 } // namespace ash
131
132 #endif // ASH_WM_COMMON_WINDOW_POSITIONER_H_
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