ash/wm/lock_window_state.h

   1 // Copyright 2014 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_LOCK_WINDOW_STATE_H_
   6 #define ASH_WM_LOCK_WINDOW_STATE_H_
   7
   8 #include "ash/wm/window_state.h"
   9
  10 namespace ash {
  11
  12 // The LockWindowState implementation which reduces all possible window
  13 // states to maximized (or normal if can't be maximized)/minimized/full-screen
  14 // and is applied only on lock (login) window container.
  15 // LockWindowState implements Ash behavior without state machine.
  16 class LockWindowState : public wm::WindowState::State {
  17  public:
  18   // The |window|'s state object will be modified to use this new window mode
  19   // state handler.
  20   explicit LockWindowState(aura::Window* window);
  21   ~LockWindowState() override;
  22
  23   // WindowState::State overrides:
  24   void OnWMEvent(wm::WindowState* window_state,
  25                  const wm::WMEvent* event) override;
  26   wm::WindowStateType GetType() const override;
  27   void AttachState(wm::WindowState* window_state,
  28                    wm::WindowState::State* previous_state) override;
  29   void DetachState(wm::WindowState* window_state) override;
  30
  31   // Creates new LockWindowState instance and attaches it to |window|.
  32   static wm::WindowState* SetLockWindowState(aura::Window* window);
  33
  34  private:
  35   // Updates the window to |new_state_type| and resulting bounds:
  36   // Either full screen, maximized centered or minimized. If the state does not
  37   // change, only the bounds will be changed.
  38   void UpdateWindow(wm::WindowState* window_state,
  39                     wm::WindowStateType new_state_type);
  40
  41   // Depending on the capabilities of the window we either return
  42   // |WINDOW_STATE_TYPE_MAXIMIZED| or |WINDOW_STATE_TYPE_NORMAL|.
  43   wm::WindowStateType GetMaximizedOrCenteredWindowType(
  44       wm::WindowState* window_state);
  45
  46   // Updates the bounds taking virtual keyboard bounds into consideration.
  47   void UpdateBounds(wm::WindowState* window_state);
  48
  49   // The current state type. Due to the nature of this state, this can only be
  50   // WM_STATE_TYPE{NORMAL, MINIMIZED, MAXIMIZED}.
  51   wm::WindowStateType current_state_type_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(LockWindowState);
  54 };
  55
  56 }  // namespace ash
  57
  58 #endif  // ASH_WM_LOCK_WINDOW_STATE_H_