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      1 // Copyright (c) 2012 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_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
      6 #define ASH_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
      7 
      8 #include <vector>
      9 
     10 #include "ash/ash_export.h"
     11 #include "ash/snap_to_pixel_layout_manager.h"
     12 #include "base/basictypes.h"
     13 #include "base/compiler_specific.h"
     14 #include "base/memory/scoped_ptr.h"
     15 #include "ui/aura/window_observer.h"
     16 #include "ui/keyboard/keyboard_controller_observer.h"
     17 
     18 namespace aura {
     19 class Window;
     20 class EventFilter;
     21 }
     22 namespace gfx {
     23 class Rect;
     24 }
     25 namespace views {
     26 class Widget;
     27 }
     28 
     29 namespace ash {
     30 
     31 // LayoutManager for the modal window container.
     32 // System modal windows which are centered on the screen will be kept centered
     33 // when the container size changes.
     34 class ASH_EXPORT SystemModalContainerLayoutManager
     35     : public SnapToPixelLayoutManager,
     36       public aura::WindowObserver,
     37       public keyboard::KeyboardControllerObserver {
     38  public:
     39   explicit SystemModalContainerLayoutManager(aura::Window* container);
     40   virtual ~SystemModalContainerLayoutManager();
     41 
     42   bool has_modal_background() const { return modal_background_ != NULL; }
     43 
     44   // Overridden from SnapToPixelLayoutManager:
     45   virtual void OnWindowResized() OVERRIDE;
     46   virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
     47   virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
     48   virtual void SetChildBounds(aura::Window* child,
     49                               const gfx::Rect& requested_bounds) OVERRIDE;
     50 
     51   // Overridden from aura::WindowObserver:
     52   virtual void OnWindowPropertyChanged(aura::Window* window,
     53                                        const void* key,
     54                                        intptr_t old) OVERRIDE;
     55   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
     56 
     57   // Overridden from keyboard::KeyboardControllerObserver:
     58   virtual void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) OVERRIDE;
     59 
     60   // Can a given |window| receive and handle input events?
     61   bool CanWindowReceiveEvents(aura::Window* window);
     62 
     63   // Activates next modal window if any. Returns false if there
     64   // are no more modal windows in this layout manager.
     65   bool ActivateNextModalWindow();
     66 
     67   // Creates modal background window, which is a partially-opaque
     68   // fullscreen window. If there is already a modal background window,
     69   // it will bring it the top.
     70   void CreateModalBackground();
     71 
     72   void DestroyModalBackground();
     73 
     74   // Is the |window| modal background?
     75   static bool IsModalBackground(aura::Window* window);
     76 
     77  private:
     78   void AddModalWindow(aura::Window* window);
     79   void RemoveModalWindow(aura::Window* window);
     80 
     81   // Reposition the dialogs to become visible after the work area changes.
     82   void PositionDialogsAfterWorkAreaResize();
     83 
     84   // Get the usable bounds rectangle for enclosed dialogs.
     85   gfx::Rect GetUsableDialogArea();
     86 
     87   // Gets the new bounds for a |window| to use which are either centered (if the
     88   // window was previously centered) or fitted to the screen.
     89   gfx::Rect GetCenteredAndOrFittedBounds(const aura::Window* window);
     90 
     91   // Returns true if |window_bounds| is centered.
     92   bool DialogIsCentered(const gfx::Rect& window_bounds);
     93 
     94   aura::Window* modal_window() {
     95     return !modal_windows_.empty() ? modal_windows_.back() : NULL;
     96   }
     97 
     98   // The container that owns the layout manager.
     99   aura::Window* container_;
    100 
    101   // A widget that dims the windows behind the modal window(s) being
    102   // shown in |container_|.
    103   views::Widget* modal_background_;
    104 
    105   // A stack of modal windows. Only the topmost can receive events.
    106   std::vector<aura::Window*> modal_windows_;
    107 
    108   DISALLOW_COPY_AND_ASSIGN(SystemModalContainerLayoutManager);
    109 };
    110 
    111 }  // namespace ash
    112 
    113 #endif  // ASH_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
    114