ash/common/wm/lock_layout_manager.h

// Copyright 2014 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_COMMON_WM_LOCK_LAYOUT_MANAGER_H_
#define ASH_COMMON_WM_LOCK_LAYOUT_MANAGER_H_

#include "ash/ash_export.h"
#include "ash/common/shell_observer.h"
#include "ash/common/wm/wm_snap_to_pixel_layout_manager.h"
#include "ash/common/wm/wm_types.h"
#include "ash/common/wm_window_observer.h"
#include "base/macros.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/keyboard/keyboard_controller.h"
#include "ui/keyboard/keyboard_controller_observer.h"

namespace ash {
namespace wm {
class WindowState;
class WMEvent;
}

// LockLayoutManager is used for the windows created in LockScreenContainer.
// For Chrome OS this includes out-of-box/login/lock/multi-profile login use
// cases. LockScreenContainer does not use default work area definition.
// By default work area is defined as display area minus shelf, docked windows
// and minus virtual keyboard bounds.
// For windows in LockScreenContainer work area is display area minus virtual
// keyboard bounds (only if keyboard overscroll is disabled). If keyboard
// overscroll is enabled then work area always equals to display area size since
// virtual keyboard changes inner workspace of each WebContents.
// For all windows in LockScreenContainer default wm::WindowState is replaced
// with LockWindowState.
class ASH_EXPORT LockLayoutManager
    : public wm::WmSnapToPixelLayoutManager,
      public WmWindowObserver,
      public ShellObserver,
      public keyboard::KeyboardControllerObserver {
 public:
  explicit LockLayoutManager(WmWindow* window);
  ~LockLayoutManager() override;

  // Overridden from WmSnapToPixelLayoutManager:
  void OnWindowResized() override;
  void OnWindowAddedToLayout(WmWindow* child) override;
  void OnWillRemoveWindowFromLayout(WmWindow* child) override;
  void OnWindowRemovedFromLayout(WmWindow* child) override;
  void OnChildWindowVisibilityChanged(WmWindow* child, bool visibile) override;
  void SetChildBounds(WmWindow* child,
                      const gfx::Rect& requested_bounds) override;

  // Overriden from WmWindowObserver:
  void OnWindowDestroying(WmWindow* window) override;
  void OnWindowBoundsChanged(WmWindow* window,
                             const gfx::Rect& old_bounds,
                             const gfx::Rect& new_bounds) override;

  // ShellObserver:
  void OnVirtualKeyboardStateChanged(bool activated) override;

  // keyboard::KeyboardControllerObserver overrides:
  void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
  void OnKeyboardClosed() override;

 private:
  // Adjusts the bounds of all managed windows when the display area changes.
  // This happens when the display size, work area insets has changed.
  void AdjustWindowsForWorkAreaChange(const wm::WMEvent* event);

  WmWindow* window_;
  WmWindow* root_window_;

  // True is subscribed as keyboard controller observer.
  bool is_observing_keyboard_;

  // The bounds of the keyboard.
  gfx::Rect keyboard_bounds_;

  DISALLOW_COPY_AND_ASSIGN(LockLayoutManager);
};

}  // namespace ash

#endif  // ASH_COMMON_WM_LOCK_LAYOUT_MANAGER_H_