ash/wm/maximize_mode/maximize_mode_window_manager.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_MANAGER_H_
   6 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_MANAGER_H_
   7
   8 #include <map>
   9 #include <set>
  10
  11 #include "ash/ash_export.h"
  12 #include "ash/shell_observer.h"
  13 #include "ash/wm/window_state.h"
  14 #include "base/basictypes.h"
  15 #include "base/compiler_specific.h"
  16 #include "ui/aura/window_observer.h"
  17 #include "ui/events/event_handler.h"
  18 #include "ui/gfx/display_observer.h"
  19
  20 namespace ui {
  21 class TouchEvent;
  22 }
  23
  24 namespace ash {
  25 class MaximizeModeController;
  26 class MaximizeModeWindowState;
  27
  28 // A window manager which - when created - will force all windows into maximized
  29 // mode. Exception are panels and windows which cannot be maximized.
  30 // Windows which cannot be maximized / resized are centered with a layer placed
  31 // behind the window so that no other windows are visible and/or obscured.
  32 // With the destruction of the manager all windows will be restored to their
  33 // original state.
  34 class ASH_EXPORT MaximizeModeWindowManager : public aura::WindowObserver,
  35                                              public gfx::DisplayObserver,
  36                                              public ShellObserver,
  37                                              public ui::EventHandler {
  38  public:
  39   // This should only be deleted by the creator (ash::Shell).
  40   ~MaximizeModeWindowManager() override;
  41
  42   // Returns the number of maximized & tracked windows by this manager.
  43   int GetNumberOfManagedWindows();
  44
  45   // Adds a window which needs to be maximized. This is used by other window
  46   // managers for windows which needs to get tracked due to (upcoming) state
  47   // changes.
  48   // The call gets ignored if the window was already or should not be handled.
  49   void AddWindow(aura::Window* window);
  50
  51   // Called from a window state object when it gets destroyed.
  52   void WindowStateDestroyed(aura::Window* window);
  53
  54   // ShellObserver overrides:
  55   void OnOverviewModeStarting() override;
  56   void OnOverviewModeEnding() override;
  57
  58   // Overridden from WindowObserver:
  59   void OnWindowDestroying(aura::Window* window) override;
  60   void OnWindowAdded(aura::Window* window) override;
  61   void OnWindowBoundsChanged(aura::Window* window,
  62                              const gfx::Rect& old_bounds,
  63                              const gfx::Rect& new_bounds) override;
  64
  65   // gfx::DisplayObserver overrides:
  66   void OnDisplayAdded(const gfx::Display& display) override;
  67   void OnDisplayRemoved(const gfx::Display& display) override;
  68   void OnDisplayMetricsChanged(const gfx::Display& display,
  69                                uint32_t metrics) override;
  70
  71   // ui::EventHandler override:
  72   void OnTouchEvent(ui::TouchEvent* event) override;
  73
  74  protected:
  75   friend class MaximizeModeController;
  76
  77   // The object should only be created by the ash::Shell.
  78   MaximizeModeWindowManager();
  79
  80  private:
  81   typedef std::map<aura::Window*, MaximizeModeWindowState*> WindowToState;
  82
  83   // Maximize all windows and restore their current state.
  84   void MaximizeAllWindows();
  85
  86   // Restore all windows to their previous state.
  87   void RestoreAllWindows();
  88
  89   // Set whether to defer bounds updates on all tracked windows. When set to
  90   // false bounds will be updated as they may be stale.
  91   void SetDeferBoundsUpdates(bool defer_bounds_updates);
  92
  93   // If the given window should be handled by us, this function will maximize it
  94   // and add it to the list of known windows (remembering the initial show
  95   // state).
  96   // Note: If the given window cannot be handled by us the function will return
  97   // immediately.
  98   void MaximizeAndTrackWindow(aura::Window* window);
  99
 100   // Remove a window from our tracking list.
 101   void ForgetWindow(aura::Window* window);
 102
 103   // Returns true when the given window should be modified in any way by us.
 104   bool ShouldHandleWindow(aura::Window* window);
 105
 106   // Add window creation observers to track creation of new windows.
 107   void AddWindowCreationObservers();
 108
 109   // Remove Window creation observers.
 110   void RemoveWindowCreationObservers();
 111
 112   // Change the internal state (e.g. observers) when the display configuration
 113   // changes.
 114   void DisplayConfigurationChanged();
 115
 116   // Returns true when the |window| is a container window.
 117   bool IsContainerWindow(aura::Window* window);
 118
 119   // Add a backdrop behind the currently active window on each desktop.
 120   void EnableBackdropBehindTopWindowOnEachDisplay(bool enable);
 121
 122   // Every window which got touched by our window manager gets added here.
 123   WindowToState window_state_map_;
 124
 125   // All container windows which have to be tracked.
 126   std::set<aura::Window*> observed_container_windows_;
 127
 128   // True if all backdrops are hidden.
 129   bool backdrops_hidden_;
 130
 131   DISALLOW_COPY_AND_ASSIGN(MaximizeModeWindowManager);
 132 };
 133
 134 }  // namespace ash
 135
 136 #endif  // ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_MANAGER_H_