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_BASE_LAYOUT_MANAGER_H_
6 #define ASH_WM_BASE_LAYOUT_MANAGER_H_
10 #include "ash/ash_export.h"
11 #include "ash/shell_observer.h"
12 #include "ash/wm/window_state_observer.h"
13 #include "base/basictypes.h"
14 #include "base/compiler_specific.h"
15 #include "ui/aura/client/activation_change_observer.h"
16 #include "ui/aura/layout_manager.h"
17 #include "ui/aura/window_observer.h"
18 #include "ui/base/ui_base_types.h"
19 #include "ui/events/event_handler.h"
32 // BaseLayoutManager is the simplest possible implementation for a window
33 // layout manager. It listens for changes to kShowStateKey and resizes the
34 // window appropriately. Subclasses should be sure to invoke the base class
35 // for adding and removing windows, otherwise show state will not be tracked
37 class ASH_EXPORT BaseLayoutManager
38 : public aura::LayoutManager,
39 public aura::WindowObserver,
40 public aura::client::ActivationChangeObserver,
42 public wm::WindowStateObserver {
44 typedef std::set<aura::Window*> WindowSet;
46 explicit BaseLayoutManager(aura::Window* root_window);
47 virtual ~BaseLayoutManager();
49 const WindowSet& windows() const { return windows_; }
51 // Given a |window| and tentative |restore_bounds|, returns new bounds that
52 // ensure that at least a few pixels of the screen background are visible
53 // outside the edges of the window.
54 static gfx::Rect BoundsWithScreenEdgeVisible(aura::Window* window,
55 const gfx::Rect& restore_bounds);
57 // aura::LayoutManager overrides:
58 virtual void OnWindowResized() OVERRIDE;
59 virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
60 virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
61 virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE;
62 virtual void OnChildWindowVisibilityChanged(aura::Window* child,
63 bool visible) OVERRIDE;
64 virtual void SetChildBounds(aura::Window* child,
65 const gfx::Rect& requested_bounds) OVERRIDE;
67 // aura::WindowObserver overrides:
68 virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
69 virtual void OnWindowBoundsChanged(aura::Window* window,
70 const gfx::Rect& old_bounds,
71 const gfx::Rect& new_bounds) OVERRIDE;
73 // aura::client::ActivationChangeObserver overrides:
74 virtual void OnWindowActivated(aura::Window* gained_active,
75 aura::Window* lost_active) OVERRIDE;
77 // ash::ShellObserver overrides:
78 virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;
80 // wm::WindowStateObserver overrides:
81 virtual void OnWindowShowTypeChanged(wm::WindowState* window_state,
82 wm::WindowShowType type) OVERRIDE;
85 enum AdjustWindowReason {
86 ADJUST_WINDOW_DISPLAY_SIZE_CHANGED,
87 ADJUST_WINDOW_WORK_AREA_INSETS_CHANGED,
90 // Invoked from OnWindowPropertyChanged() if |kShowStateKey| changes.
91 virtual void ShowStateChanged(wm::WindowState* window_state,
92 ui::WindowShowState last_show_state);
94 // Adjusts the window's bounds when the display area changes for given
95 // window. This happens when the display size, work area insets or
96 // the display on which the window exists has changed.
97 // If this is called for a display size change (i.e. |reason|
98 // is ADJUST_WINDOW_DISPLAY_SIZE_CHANGED), the non-maximized/non-fullscreen
99 // windows are readjusted to make sure the window is completely within the
100 // display region. Otherwise, it makes sure at least some parts of the window
102 virtual void AdjustAllWindowsBoundsForWorkAreaChange(
103 AdjustWindowReason reason);
105 // Adjusts the sizes of the specific window in respond to a screen change or
106 // display-area size change.
107 virtual void AdjustWindowBoundsForWorkAreaChange(
108 wm::WindowState* window_state,
109 AdjustWindowReason reason);
111 aura::Window* root_window() { return root_window_; }
114 // Update window bounds based on a change in show state.
115 void UpdateBoundsFromShowState(wm::WindowState* controller);
117 // Set of windows we're listening to.
120 aura::Window* root_window_;
122 DISALLOW_COPY_AND_ASSIGN(BaseLayoutManager);
125 } // namespace internal
128 #endif // ASH_WM_BASE_LAYOUT_MANAGER_H_