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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 "base/basictypes.h"
     12 #include "base/compiler_specific.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "ui/aura/layout_manager.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 aura::LayoutManager,
     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 aura::LayoutManager:
     45   virtual void OnWindowResized() OVERRIDE;
     46   virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
     47   virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
     48   virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE;
     49   virtual void OnChildWindowVisibilityChanged(aura::Window* child,
     50                                               bool visibile) OVERRIDE;
     51   virtual void SetChildBounds(aura::Window* child,
     52                               const gfx::Rect& requested_bounds) OVERRIDE;
     53 
     54   // Overridden from aura::WindowObserver:
     55   virtual void OnWindowPropertyChanged(aura::Window* window,
     56                                        const void* key,
     57                                        intptr_t old) OVERRIDE;
     58   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
     59 
     60   // Overridden from keyboard::KeyboardControllerObserver:
     61   virtual void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) OVERRIDE;
     62 
     63   // Can a given |window| receive and handle input events?
     64   bool CanWindowReceiveEvents(aura::Window* window);
     65 
     66   // Activates next modal window if any. Returns false if there
     67   // are no more modal windows in this layout manager.
     68   bool ActivateNextModalWindow();
     69 
     70   // Creates modal background window, which is a partially-opaque
     71   // fullscreen window. If there is already a modal background window,
     72   // it will bring it the top.
     73   void CreateModalBackground();
     74 
     75   void DestroyModalBackground();
     76 
     77   // Is the |window| modal background?
     78   static bool IsModalBackground(aura::Window* window);
     79 
     80  private:
     81   void AddModalWindow(aura::Window* window);
     82   void RemoveModalWindow(aura::Window* window);
     83 
     84   // Reposition the dialogs to become visible after the work area changes.
     85   void PositionDialogsAfterWorkAreaResize();
     86 
     87   // Get the usable bounds rectangle for enclosed dialogs.
     88   gfx::Rect GetUsableDialogArea();
     89 
     90   // Gets the new bounds for a |window| to use which are either centered (if the
     91   // window was previously centered) or fitted to the screen.
     92   gfx::Rect GetCenteredAndOrFittedBounds(const aura::Window* window);
     93 
     94   // Returns true if |window_bounds| is centered.
     95   bool DialogIsCentered(const gfx::Rect& window_bounds);
     96 
     97   aura::Window* modal_window() {
     98     return !modal_windows_.empty() ? modal_windows_.back() : NULL;
     99   }
    100 
    101   // The container that owns the layout manager.
    102   aura::Window* container_;
    103 
    104   // A widget that dims the windows behind the modal window(s) being
    105   // shown in |container_|.
    106   views::Widget* modal_background_;
    107 
    108   // A stack of modal windows. Only the topmost can receive events.
    109   std::vector<aura::Window*> modal_windows_;
    110 
    111   DISALLOW_COPY_AND_ASSIGN(SystemModalContainerLayoutManager);
    112 };
    113 
    114 }  // namespace ash
    115 
    116 #endif  // ASH_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
    117