ash/wm/maximize_mode/maximize_mode_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_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_STATE_H_
   6 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_STATE_H_
   7
   8 #include "ash/wm/window_state.h"
   9
  10 namespace ash {
  11 class MaximizeModeWindowManager;
  12
  13 // The MaximizeModeWindowState implementation which reduces all possible window
  14 // states to minimized and maximized. If a window cannot be maximized it will be
  15 // set to normal. If a window cannot fill the entire workspace it will be
  16 // centered within the workspace.
  17 class MaximizeModeWindowState : public wm::WindowState::State {
  18  public:
  19   // Called when the window position might need to be updated.
  20   static void UpdateWindowPosition(wm::WindowState* window_state);
  21
  22   // The |window|'s state object will be modified to use this new window mode
  23   // state handler. Upon destruction it will restore the previous state handler
  24   // and call |creator::WindowStateDestroyed()| to inform that the window mode
  25   // was reverted to the old window manager.
  26   MaximizeModeWindowState(aura::Window* window,
  27                           MaximizeModeWindowManager* creator);
  28   ~MaximizeModeWindowState() override;
  29
  30   // Leaves the maximize mode by reverting to previous state object.
  31   void LeaveMaximizeMode(wm::WindowState* window_state);
  32
  33   // Sets whether to ignore bounds updates. If set to false, immediately does a
  34   // bounds update as the current window bounds may no longer be correct.
  35   void SetDeferBoundsUpdates(bool defer_bounds_updates);
  36
  37   // WindowState::State overrides:
  38   void OnWMEvent(wm::WindowState* window_state,
  39                  const wm::WMEvent* event) override;
  40
  41   wm::WindowStateType GetType() const override;
  42   void AttachState(wm::WindowState* window_state,
  43                    wm::WindowState::State* previous_state) override;
  44   void DetachState(wm::WindowState* window_state) override;
  45
  46  private:
  47   // Updates the window to |new_state_type| and resulting bounds:
  48   // Either full screen, maximized centered or minimized. If the state does not
  49   // change, only the bounds will be changed. If |animate| is set, the bound
  50   // change get animated.
  51   void UpdateWindow(wm::WindowState* window_state,
  52                     wm::WindowStateType new_state_type,
  53                     bool animate);
  54
  55   // Depending on the capabilities of the window we either return
  56   // |WINDOW_STATE_TYPE_MAXIMIZED| or |WINDOW_STATE_TYPE_NORMAL|.
  57   wm::WindowStateType GetMaximizedOrCenteredWindowType(
  58       wm::WindowState* window_state);
  59
  60   // Updates the bounds to the maximum possible bounds according to the current
  61   // window state. If |animated| is set we animate the change.
  62   void UpdateBounds(wm::WindowState* window_state, bool animated);
  63
  64   // The original state object of the window.
  65   scoped_ptr<wm::WindowState::State> old_state_;
  66
  67   // The state object for this object which owns this instance.
  68   aura::Window* window_;
  69
  70   // The creator which needs to be informed when this state goes away.
  71   MaximizeModeWindowManager* creator_;
  72
  73   // The current state type. Due to the nature of this state, this can only be
  74   // WM_STATE_TYPE{NORMAL, MINIMIZED, MAXIMIZED}.
  75   wm::WindowStateType current_state_type_;
  76
  77   // If true, do not update bounds.
  78   bool defer_bounds_updates_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(MaximizeModeWindowState);
  81 };
  82
  83 }  // namespace ash
  84
  85 #endif  // ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_STATE_H_