chrome/browser/ui/views/toolbar/browser_action_view.h

   1 // Copyright 2013 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 CHROME_BROWSER_UI_VIEWS_TOOLBAR_BROWSER_ACTION_VIEW_H_
   6 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_BROWSER_ACTION_VIEW_H_
   7
   8 #include <string>
   9
  10 #include "chrome/browser/extensions/extension_action_icon_factory.h"
  11 #include "chrome/browser/extensions/extension_context_menu_model.h"
  12 #include "content/public/browser/notification_observer.h"
  13 #include "content/public/browser/notification_registrar.h"
  14 #include "ui/views/context_menu_controller.h"
  15 #include "ui/views/controls/button/menu_button.h"
  16 #include "ui/views/controls/button/menu_button_listener.h"
  17 #include "ui/views/drag_controller.h"
  18 #include "ui/views/view.h"
  19
  20 class Browser;
  21 class BrowserActionButton;
  22 class ExtensionAction;
  23
  24 namespace extensions {
  25 class Extension;
  26 }
  27
  28 namespace gfx {
  29 class Image;
  30 }
  31
  32 namespace views {
  33 class MenuItemView;
  34 class MenuRunner;
  35 }
  36
  37 ////////////////////////////////////////////////////////////////////////////////
  38 // BrowserActionView
  39 // A single entry in the browser action container. This contains the actual
  40 // BrowserActionButton, as well as the logic to paint the badge.
  41 class BrowserActionView : public views::View {
  42  public:
  43   // Need DragController here because BrowserActionView could be
  44   // dragged/dropped.
  45   class Delegate : public views::DragController,
  46                    public ExtensionContextMenuModel::PopupDelegate {
  47    public:
  48     // Returns the current tab's ID, or -1 if there is no current tab.
  49     virtual int GetCurrentTabId() const = 0;
  50
  51     // Called when the user clicks on the browser action icon.
  52     virtual void OnBrowserActionExecuted(BrowserActionButton* button) = 0;
  53
  54     // Called when a browser action becomes visible/hidden.
  55     virtual void OnBrowserActionVisibilityChanged() = 0;
  56
  57     // Returns relative position of a button inside BrowserActionView.
  58     virtual gfx::Point GetViewContentOffset() const = 0;
  59
  60     virtual bool NeedToShowMultipleIconStates() const;
  61     virtual bool NeedToShowTooltip() const;
  62
  63    protected:
  64     virtual ~Delegate() {}
  65   };
  66
  67   BrowserActionView(const extensions::Extension* extension,
  68                     Browser* browser,
  69                     Delegate* delegate);
  70   virtual ~BrowserActionView();
  71
  72   BrowserActionButton* button() { return button_; }
  73
  74   // Gets browser action button icon with the badge.
  75   gfx::ImageSkia GetIconWithBadge();
  76
  77   // Overridden from views::View:
  78   virtual void Layout() OVERRIDE;
  79   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
  80   virtual gfx::Size GetPreferredSize() OVERRIDE;
  81
  82  protected:
  83   // Overridden from views::View to paint the badge on top of children.
  84   virtual void PaintChildren(gfx::Canvas* canvas) OVERRIDE;
  85
  86  private:
  87   // The Browser object this view is associated with.
  88   Browser* browser_;
  89
  90   // Usually a container for this view.
  91   Delegate* delegate_;
  92
  93   // The button this view contains.
  94   BrowserActionButton* button_;
  95
  96   // Extension this view associated with.
  97   const extensions::Extension* extension_;
  98
  99   DISALLOW_COPY_AND_ASSIGN(BrowserActionView);
 100 };
 101
 102 ////////////////////////////////////////////////////////////////////////////////
 103 // BrowserActionButton
 104
 105 // The BrowserActionButton is a specialization of the MenuButton class.
 106 // It acts on a ExtensionAction, in this case a BrowserAction and handles
 107 // loading the image for the button asynchronously on the file thread.
 108 class BrowserActionButton : public views::MenuButton,
 109                             public views::ButtonListener,
 110                             public views::ContextMenuController,
 111                             public content::NotificationObserver,
 112                             public ExtensionActionIconFactory::Observer {
 113  public:
 114   BrowserActionButton(const extensions::Extension* extension,
 115                       Browser* browser_,
 116                       BrowserActionView::Delegate* delegate);
 117
 118   // Call this instead of delete.
 119   void Destroy();
 120
 121   ExtensionAction* browser_action() const { return browser_action_; }
 122   const extensions::Extension* extension() { return extension_; }
 123
 124   // Called to update the display to match the browser action's state.
 125   void UpdateState();
 126
 127   // Does this button's action have a popup?
 128   virtual bool IsPopup();
 129   virtual GURL GetPopupUrl();
 130
 131   // Overridden from views::View:
 132   virtual bool CanHandleAccelerators() const OVERRIDE;
 133   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 134
 135   // Overridden from views::ButtonListener:
 136   virtual void ButtonPressed(views::Button* sender,
 137                              const ui::Event& event) OVERRIDE;
 138
 139   // Overridden from views::ContextMenuController.
 140   virtual void ShowContextMenuForView(View* source,
 141                                       const gfx::Point& point,
 142                                       ui::MenuSourceType source_type) OVERRIDE;
 143
 144   // Overridden from content::NotificationObserver:
 145   virtual void Observe(int type,
 146                        const content::NotificationSource& source,
 147                        const content::NotificationDetails& details) OVERRIDE;
 148
 149   // Overriden from ExtensionActionIconFactory::Observer.
 150   virtual void OnIconUpdated() OVERRIDE;
 151
 152   // MenuButton behavior overrides.  These methods all default to TextButton
 153   // behavior unless this button is a popup.  In that case, it uses MenuButton
 154   // behavior.  MenuButton has the notion of a child popup being shown where the
 155   // button will stay in the pushed state until the "menu" (a popup in this
 156   // case) is dismissed.
 157   virtual bool Activate() OVERRIDE;
 158   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
 159   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
 160   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
 161   virtual bool OnKeyReleased(const ui::KeyEvent& event) OVERRIDE;
 162   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 163
 164   // Overridden from ui::AcceleratorTarget.
 165   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
 166
 167   // Notifications when to set button state to pushed/not pushed (for when the
 168   // popup/context menu is hidden or shown by the container).
 169   void SetButtonPushed();
 170   void SetButtonNotPushed();
 171
 172   // Whether the browser action is enabled on this tab. Note that we cannot use
 173   // the built-in views enabled/SetEnabled because disabled views do not
 174   // receive drag events.
 175   bool IsEnabled(int tab_id) const;
 176
 177   // Returns icon factory for the button.
 178   ExtensionActionIconFactory& icon_factory() { return icon_factory_; }
 179
 180   // Returns button icon so it can be accessed during tests.
 181   gfx::ImageSkia GetIconForTest();
 182
 183  protected:
 184   // Overridden from views::View:
 185   virtual void ViewHierarchyChanged(
 186       const ViewHierarchyChangedDetails& details) OVERRIDE;
 187
 188  private:
 189   virtual ~BrowserActionButton();
 190
 191   // Register an extension command if the extension has an active one.
 192   void MaybeRegisterExtensionCommand();
 193
 194   // Unregisters an extension command, if the extension has registered one and
 195   // it is active.
 196   void MaybeUnregisterExtensionCommand(bool only_if_active);
 197
 198   // The Browser object this button is associated with.
 199   Browser* browser_;
 200
 201   // The browser action this view represents. The ExtensionAction is not owned
 202   // by this class.
 203   ExtensionAction* browser_action_;
 204
 205   // The extension associated with the browser action we're displaying.
 206   const extensions::Extension* extension_;
 207
 208   // The object that will be used to get the browser action icon for us.
 209   // It may load the icon asynchronously (in which case the initial icon
 210   // returned by the factory will be transparent), so we have to observe it for
 211   // updates to the icon.
 212   ExtensionActionIconFactory icon_factory_;
 213
 214   // Delegate that usually represents a container for BrowserActionView.
 215   BrowserActionView::Delegate* delegate_;
 216
 217   // The context menu.  This member is non-NULL only when the menu is shown.
 218   views::MenuItemView* context_menu_;
 219
 220   // Used to make sure MaybeRegisterExtensionCommand() is called only once
 221   // from ViewHierarchyChanged().
 222   bool called_registered_extension_command_;
 223
 224   content::NotificationRegistrar registrar_;
 225
 226   // The extension key binding accelerator this browser action is listening for
 227   // (to show the popup).
 228   scoped_ptr<ui::Accelerator> keybinding_;
 229
 230   // Responsible for running the menu.
 231   scoped_ptr<views::MenuRunner> menu_runner_;
 232
 233   friend class base::DeleteHelper<BrowserActionButton>;
 234
 235   DISALLOW_COPY_AND_ASSIGN(BrowserActionButton);
 236 };
 237
 238 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_BROWSER_ACTION_VIEW_H_