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      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   virtual ~MaximizeModeWindowManager();
     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   virtual void OnOverviewModeStarting() OVERRIDE;
     56   virtual void OnOverviewModeEnding() OVERRIDE;
     57 
     58   // Overridden from WindowObserver:
     59   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
     60   virtual void OnWindowAdded(aura::Window* window) OVERRIDE;
     61   virtual void OnWindowBoundsChanged(aura::Window* window,
     62                                      const gfx::Rect& old_bounds,
     63                                      const gfx::Rect& new_bounds) OVERRIDE;
     64 
     65   // gfx::DisplayObserver overrides:
     66   virtual void OnDisplayAdded(const gfx::Display& display) OVERRIDE;
     67   virtual void OnDisplayRemoved(const gfx::Display& display) OVERRIDE;
     68   virtual void OnDisplayMetricsChanged(const gfx::Display& display,
     69                                        uint32_t metrics) OVERRIDE;
     70 
     71   // ui::EventHandler override:
     72   virtual 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   // If the given window should be handled by us, this function will maximize it
     90   // and add it to the list of known windows (remembering the initial show
     91   // state).
     92   // Note: If the given window cannot be handled by us the function will return
     93   // immediately.
     94   void MaximizeAndTrackWindow(aura::Window* window);
     95 
     96   // Remove a window from our tracking list.
     97   void ForgetWindow(aura::Window* window);
     98 
     99   // Returns true when the given window should be modified in any way by us.
    100   bool ShouldHandleWindow(aura::Window* window);
    101 
    102   // Add window creation observers to track creation of new windows.
    103   void AddWindowCreationObservers();
    104 
    105   // Remove Window creation observers.
    106   void RemoveWindowCreationObservers();
    107 
    108   // Change the internal state (e.g. observers) when the display configuration
    109   // changes.
    110   void DisplayConfigurationChanged();
    111 
    112   // Returns true when the |window| is a container window.
    113   bool IsContainerWindow(aura::Window* window);
    114 
    115   // Add a backdrop behind the currently active window on each desktop.
    116   void EnableBackdropBehindTopWindowOnEachDisplay(bool enable);
    117 
    118   // Every window which got touched by our window manager gets added here.
    119   WindowToState window_state_map_;
    120 
    121   // All container windows which have to be tracked.
    122   std::set<aura::Window*> observed_container_windows_;
    123 
    124   // True if all backdrops are hidden.
    125   bool backdrops_hidden_;
    126 
    127   DISALLOW_COPY_AND_ASSIGN(MaximizeModeWindowManager);
    128 };
    129 
    130 }  // namespace ash
    131 
    132 #endif  // ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_MANAGER_H_
    133