ash/wm/system_modal_container_layout_manager.h

   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   ~SystemModalContainerLayoutManager() override;
  41
  42   bool has_modal_background() const { return modal_background_ != NULL; }
  43
  44   // Overridden from SnapToPixelLayoutManager:
  45   void OnWindowResized() override;
  46   void OnWindowAddedToLayout(aura::Window* child) override;
  47   void OnWillRemoveWindowFromLayout(aura::Window* child) override;
  48   void SetChildBounds(aura::Window* child,
  49                       const gfx::Rect& requested_bounds) override;
  50
  51   // Overridden from aura::WindowObserver:
  52   void OnWindowPropertyChanged(aura::Window* window,
  53                                const void* key,
  54                                intptr_t old) override;
  55   void OnWindowDestroying(aura::Window* window) override;
  56
  57   // Overridden from keyboard::KeyboardControllerObserver:
  58   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_