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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_WM_BASE_LAYOUT_MANAGER_H_
#define ASH_WM_BASE_LAYOUT_MANAGER_H_
#include <set>
#include "ash/ash_export.h"
#include "ash/shell_observer.h"
#include "ash/wm/window_state_observer.h"
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/aura/client/activation_change_observer.h"
#include "ui/aura/layout_manager.h"
#include "ui/aura/window_observer.h"
#include "ui/base/ui_base_types.h"
#include "ui/events/event_handler.h"
namespace aura {
class Window;
}
namespace ash {
namespace wm {
class WindowState;
}
namespace internal {
// BaseLayoutManager is the simplest possible implementation for a window
// layout manager. It listens for changes to kShowStateKey and resizes the
// window appropriately. Subclasses should be sure to invoke the base class
// for adding and removing windows, otherwise show state will not be tracked
// properly.
class ASH_EXPORT BaseLayoutManager
: public aura::LayoutManager,
public aura::WindowObserver,
public aura::client::ActivationChangeObserver,
public ShellObserver,
public wm::WindowStateObserver {
public:
typedef std::set<aura::Window*> WindowSet;
explicit BaseLayoutManager(aura::Window* root_window);
virtual ~BaseLayoutManager();
const WindowSet& windows() const { return windows_; }
// Given a |window| and tentative |restore_bounds|, returns new bounds that
// ensure that at least a few pixels of the screen background are visible
// outside the edges of the window.
static gfx::Rect BoundsWithScreenEdgeVisible(aura::Window* window,
const gfx::Rect& restore_bounds);
// aura::LayoutManager overrides:
virtual void OnWindowResized() OVERRIDE;
virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE;
virtual void OnChildWindowVisibilityChanged(aura::Window* child,
bool visible) OVERRIDE;
virtual void SetChildBounds(aura::Window* child,
const gfx::Rect& requested_bounds) OVERRIDE;
// aura::WindowObserver overrides:
virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
virtual void OnWindowBoundsChanged(aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) OVERRIDE;
// aura::client::ActivationChangeObserver overrides:
virtual void OnWindowActivated(aura::Window* gained_active,
aura::Window* lost_active) OVERRIDE;
// ash::ShellObserver overrides:
virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;
// wm::WindowStateObserver overrides:
virtual void OnWindowShowTypeChanged(wm::WindowState* window_state,
wm::WindowShowType type) OVERRIDE;
protected:
enum AdjustWindowReason {
ADJUST_WINDOW_DISPLAY_SIZE_CHANGED,
ADJUST_WINDOW_WORK_AREA_INSETS_CHANGED,
};
// Invoked from OnWindowPropertyChanged() if |kShowStateKey| changes.
virtual void ShowStateChanged(wm::WindowState* window_state,
ui::WindowShowState last_show_state);
// Adjusts the window's bounds when the display area changes for given
// window. This happens when the display size, work area insets or
// the display on which the window exists has changed.
// If this is called for a display size change (i.e. |reason|
// is ADJUST_WINDOW_DISPLAY_SIZE_CHANGED), the non-maximized/non-fullscreen
// windows are readjusted to make sure the window is completely within the
// display region. Otherwise, it makes sure at least some parts of the window
// is on display.
virtual void AdjustAllWindowsBoundsForWorkAreaChange(
AdjustWindowReason reason);
// Adjusts the sizes of the specific window in respond to a screen change or
// display-area size change.
virtual void AdjustWindowBoundsForWorkAreaChange(
wm::WindowState* window_state,
AdjustWindowReason reason);
aura::Window* root_window() { return root_window_; }
private:
// Update window bounds based on a change in show state.
void UpdateBoundsFromShowState(wm::WindowState* controller);
// Set of windows we're listening to.
WindowSet windows_;
aura::Window* root_window_;
DISALLOW_COPY_AND_ASSIGN(BaseLayoutManager);
};
} // namespace internal
} // namespace ash
#endif // ASH_WM_BASE_LAYOUT_MANAGER_H_
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