ash/wm/panels/panel_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_PANELS_PANEL_LAYOUT_MANAGER_H_
   6 #define ASH_WM_PANELS_PANEL_LAYOUT_MANAGER_H_
   7
   8 #include <list>
   9
  10 #include "ash/ash_export.h"
  11 #include "ash/display/display_controller.h"
  12 #include "ash/shelf/shelf_icon_observer.h"
  13 #include "ash/shelf/shelf_layout_manager_observer.h"
  14 #include "ash/shell_observer.h"
  15 #include "ash/wm/window_state_observer.h"
  16 #include "base/basictypes.h"
  17 #include "base/compiler_specific.h"
  18 #include "base/memory/scoped_ptr.h"
  19 #include "base/memory/weak_ptr.h"
  20 #include "ui/aura/layout_manager.h"
  21 #include "ui/aura/window_observer.h"
  22 #include "ui/keyboard/keyboard_controller.h"
  23 #include "ui/keyboard/keyboard_controller_observer.h"
  24 #include "ui/wm/public/activation_change_observer.h"
  25
  26 namespace aura {
  27 class Window;
  28 class WindowTracker;
  29 }
  30
  31 namespace gfx {
  32 class Rect;
  33 }
  34
  35 namespace views {
  36 class Widget;
  37 }
  38
  39 namespace ash {
  40 class PanelCalloutWidget;
  41 class Shelf;
  42 class ShelfLayoutManager;
  43
  44 // PanelLayoutManager is responsible for organizing panels within the
  45 // workspace. It is associated with a specific container window (i.e.
  46 // kShellWindowId_PanelContainer) and controls the layout of any windows
  47 // added to that container.
  48 //
  49 // The constructor takes a |panel_container| argument which is expected to set
  50 // its layout manager to this instance, e.g.:
  51 // panel_container->SetLayoutManager(new PanelLayoutManager(panel_container));
  52
  53 class ASH_EXPORT PanelLayoutManager
  54     : public aura::LayoutManager,
  55       public ShelfIconObserver,
  56       public ShellObserver,
  57       public aura::WindowObserver,
  58       public wm::WindowStateObserver,
  59       public aura::client::ActivationChangeObserver,
  60       public keyboard::KeyboardControllerObserver,
  61       public DisplayController::Observer,
  62       public ShelfLayoutManagerObserver {
  63  public:
  64   explicit PanelLayoutManager(aura::Window* panel_container);
  65   ~PanelLayoutManager() override;
  66
  67   // Call Shutdown() before deleting children of panel_container.
  68   void Shutdown();
  69
  70   void StartDragging(aura::Window* panel);
  71   void FinishDragging();
  72
  73   void ToggleMinimize(aura::Window* panel);
  74
  75   // Hide / Show the panel callout widgets.
  76   void SetShowCalloutWidgets(bool show);
  77
  78   // Returns the callout widget (arrow) for |panel|.
  79   views::Widget* GetCalloutWidgetForPanel(aura::Window* panel);
  80
  81   Shelf* shelf() { return shelf_; }
  82   void SetShelf(Shelf* shelf);
  83
  84   // Overridden from aura::LayoutManager:
  85   void OnWindowResized() override;
  86   void OnWindowAddedToLayout(aura::Window* child) override;
  87   void OnWillRemoveWindowFromLayout(aura::Window* child) override;
  88   void OnWindowRemovedFromLayout(aura::Window* child) override;
  89   void OnChildWindowVisibilityChanged(aura::Window* child,
  90                                       bool visibile) override;
  91   void SetChildBounds(aura::Window* child,
  92                       const gfx::Rect& requested_bounds) override;
  93
  94   // Overridden from ShelfIconObserver
  95   void OnShelfIconPositionsChanged() override;
  96
  97   // Overridden from ShellObserver
  98   void OnOverviewModeEnded() override;
  99   void OnShelfAlignmentChanged(aura::Window* root_window) override;
 100
 101   // Overridden from aura::WindowObserver
 102   void OnWindowPropertyChanged(aura::Window* window,
 103                                const void* key,
 104                                intptr_t old) override;
 105
 106   // Overridden from ash::wm::WindowStateObserver
 107   void OnPostWindowStateTypeChange(wm::WindowState* window_state,
 108                                    wm::WindowStateType old_type) override;
 109
 110   // Overridden from aura::client::ActivationChangeObserver
 111   void OnWindowActivated(aura::Window* gained_active,
 112                          aura::Window* lost_active) override;
 113
 114   // Overridden from DisplayController::Observer
 115   void OnDisplayConfigurationChanged() override;
 116
 117   // Overridden from ShelfLayoutManagerObserver
 118   void WillChangeVisibilityState(ShelfVisibilityState new_state) override;
 119
 120  private:
 121   friend class PanelLayoutManagerTest;
 122   friend class PanelWindowResizerTest;
 123   friend class DockedWindowResizerTest;
 124   friend class DockedWindowLayoutManagerTest;
 125   friend class WorkspaceControllerTest;
 126   friend class AcceleratorControllerTest;
 127
 128   views::Widget* CreateCalloutWidget();
 129
 130   struct PanelInfo{
 131     PanelInfo() : window(NULL), callout_widget(NULL), slide_in(false) {}
 132
 133     bool operator==(const aura::Window* other_window) const {
 134       return window == other_window;
 135     }
 136
 137     // A weak pointer to the panel window.
 138     aura::Window* window;
 139     // The callout widget for this panel. This pointer must be managed
 140     // manually as this structure is used in a std::list. See
 141     // http://www.chromium.org/developers/smart-pointer-guidelines
 142     PanelCalloutWidget* callout_widget;
 143
 144     // True on new and restored panel windows until the panel has been
 145     // positioned. The first time Relayout is called the panel will be shown,
 146     // and slide into position and this will be set to false.
 147     bool slide_in;
 148   };
 149
 150   typedef std::list<PanelInfo> PanelList;
 151
 152   void MinimizePanel(aura::Window* panel);
 153   void RestorePanel(aura::Window* panel);
 154
 155   // Called whenever the panel layout might change.
 156   void Relayout();
 157
 158   // Called whenever the panel stacking order needs to be updated (e.g. focus
 159   // changes or a panel is moved).
 160   void UpdateStacking(aura::Window* active_panel);
 161
 162   // Update the callout arrows for all managed panels.
 163   void UpdateCallouts();
 164
 165   // Overridden from keyboard::KeyboardControllerObserver:
 166   void OnKeyboardBoundsChanging(const gfx::Rect& keyboard_bounds) override;
 167
 168   // Parent window associated with this layout manager.
 169   aura::Window* panel_container_;
 170   // Protect against recursive calls to OnWindowAddedToLayout().
 171   bool in_add_window_;
 172   // Protect against recursive calls to Relayout().
 173   bool in_layout_;
 174   // Indicates if the panel callout widget should be created.
 175   bool show_callout_widgets_;
 176   // Ordered list of unowned pointers to panel windows.
 177   PanelList panel_windows_;
 178   // The panel being dragged.
 179   aura::Window* dragged_panel_;
 180   // The shelf we are observing for shelf icon changes.
 181   Shelf* shelf_;
 182   // The shelf layout manager being observed for visibility changes.
 183   ShelfLayoutManager* shelf_layout_manager_;
 184
 185   // When not NULL, the shelf is hidden (i.e. full screen) and this tracks the
 186   // set of panel windows which have been temporarily hidden and need to be
 187   // restored when the shelf becomes visible again.
 188   scoped_ptr<aura::WindowTracker> restore_windows_on_shelf_visible_;
 189
 190   // The last active panel. Used to maintain stacking order even if no panels
 191   // are currently focused.
 192   aura::Window* last_active_panel_;
 193   base::WeakPtrFactory<PanelLayoutManager> weak_factory_;
 194
 195   DISALLOW_COPY_AND_ASSIGN(PanelLayoutManager);
 196 };
 197
 198 }  // namespace ash
 199
 200 #endif  // ASH_WM_PANELS_PANEL_LAYOUT_MANAGER_H_