// 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_WM_LOCK_LAYOUT_MANAGER_H_
#define ASH_WM_LOCK_LAYOUT_MANAGER_H_

#include "ash/ash_export.h"
#include "ash/shelf/shelf_observer.h"
#include "ash/shell_observer.h"
#include "ash/wm/wm_snap_to_pixel_layout_manager.h"
#include "base/macros.h"
#include "base/scoped_observer.h"
#include "ui/aura/window_observer.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/keyboard/keyboard_controller.h"
#include "ui/keyboard/keyboard_controller_observer.h"

namespace ash {

class Shelf;

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, 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 aura::WindowObserver,
      public ShellObserver,
      public ShelfObserver,
      public keyboard::KeyboardControllerObserver {
 public:
  LockLayoutManager(aura::Window* window, Shelf* shelf);
  ~LockLayoutManager() override;

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

  // Overriden from aura::WindowObserver:
  void OnWindowDestroying(aura::Window* window) override;
  void OnWindowBoundsChanged(aura::Window* window,
                             const gfx::Rect& old_bounds,
                             const gfx::Rect& new_bounds,
                             ui::PropertyChangeReason reason) override;

  // ShelfObserver:
  void WillChangeVisibilityState(ShelfVisibilityState visibility) override;

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

 protected:
  // 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);

  aura::Window* window() { return window_; }
  aura::Window* root_window() { return root_window_; }

 private:
  aura::Window* window_;
  aura::Window* root_window_;

  ScopedObserver<Shelf, ShelfObserver> shelf_observer_;

  DISALLOW_COPY_AND_ASSIGN(LockLayoutManager);
};

}  // namespace ash

#endif  // ASH_WM_LOCK_LAYOUT_MANAGER_H_