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