Refactor LauncherDelegate

ash/launcher/launcher_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_LAUNCHER_LAUNCHER_DELEGATE_H_
 #define ASH_LAUNCHER_LAUNCHER_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher_types.h"
-#include "base/strings/string16.h"
-#include "ui/base/models/simple_menu_model.h"
-
-namespace aura {
-class RootWindow;
-}
-
-namespace ui {
-class Event;
-}
 
 namespace ash {
 class Launcher;
-
-// A special menu model which keeps track of an "active" menu item.
-class ASH_EXPORT LauncherMenuModel : public ui::SimpleMenuModel {
- public:
-  explicit LauncherMenuModel(ui::SimpleMenuModel::Delegate* delegate)
-      : ui::SimpleMenuModel(delegate) {}
-
-  // Returns |true| when the given |command_id| is active and needs to be drawn
-  // in a special state.
-  virtual bool IsCommandActive(int command_id) const = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(LauncherMenuModel);
-};
+class LauncherItemDelegate;
 
 // Delegate for the Launcher.
 class ASH_EXPORT LauncherDelegate {
  public:
-  // Launcher owns the delegate.
-  virtual ~LauncherDelegate() {}
-
-  // Invoked when the user clicks on a window entry in the launcher.
-  // |event| is the click event. The |event| is dispatched by a view
-  // and has an instance of |views::View| as the event target
-  // but not |aura::Window|. If the |event| is of type KeyEvent, it is assumed
-  // that this was triggered by keyboard action (Alt+<number>) and special
-  // handling might happen (PerApp launcher).
-  virtual void ItemSelected(const LauncherItem& item,
-                            const ui::Event& event) = 0;
-
-  // Returns the title to display for the specified launcher item.
-  virtual base::string16 GetTitle(const LauncherItem& item) = 0;
-
-  // Returns the context menumodel for the specified item on
-  // |root_window|.  Return NULL if there should be no context
-  // menu. The caller takes ownership of the returned model.
-  virtual ui::MenuModel* CreateContextMenu(const LauncherItem& item,
-                                           aura::RootWindow* root_window) = 0;
-
-  // Returns the application menu model for the specified item. There are three
-  // possible return values:
-  //  - A return of NULL indicates that no menu is wanted for this item.
-  //  - A return of a menu with one item means that only the name of the
-  //    application/item was added and there are no active applications.
-  //    Note: This is useful for hover menus which also show context help.
-  //  - A list containing the title and the active list of items.
-  // The caller takes ownership of the returned model.
-  // |event_flags| specifies the flags of the event which triggered this menu.
-  virtual LauncherMenuModel* CreateApplicationMenu(
-      const LauncherItem& item,
-      int event_flags) = 0;
+  // LauncherDelegateProxy owns the delegate.
+  virtual ~LauncherDelegate();
 
   // Returns the id of the item associated with the specified window, or 0 if
   // there isn't one.
   virtual LauncherID GetIDByWindow(aura::Window* window) = 0;
 
-  // Whether the given launcher item is draggable.
-  virtual bool IsDraggable(const LauncherItem& item) = 0;
-
-  // Returns true if a tooltip should be shown for the item.
-  virtual bool ShouldShowTooltip(const LauncherItem& item) = 0;
-
   // Callback used to allow delegate to perform initialization actions that
   // depend on the Launcher being in a known state.
   virtual void OnLauncherCreated(Launcher* launcher) = 0;
 
   // Callback used to inform the delegate that a specific launcher no longer
   // exists.
   virtual void OnLauncherDestroyed(Launcher* launcher) = 0;
 
-  // True if the running launcher is the per application launcher.
-  virtual bool IsPerAppLauncher() = 0;
-
   // Get the launcher ID from an application ID.
   virtual LauncherID GetLauncherIDForAppID(const std::string& app_id) = 0;
 
   // Pins an app with |app_id| to launcher. A running instance will get pinned.
   // In case there is no running instance a new launcher item is created and
   // pinned.
   virtual void PinAppWithID(const std::string& app_id) = 0;
 
   // Check if the app with |app_id_| is pinned to the launcher.
   virtual bool IsAppPinned(const std::string& app_id) = 0;
 
   // Unpins any app item(s) whose id is |app_id|. The new launcher will collect
   // all items under one item, the old launcher might have multiple items.
   virtual void UnpinAppsWithID(const std::string& app_id) = 0;
+
+  // Returns NULL if LauncherDelegate doesn't handle |item|.
+  virtual LauncherItemDelegate* GetLauncherItemDelegate(
+      const LauncherItem& item) = 0;
+
+  // True if the running launcher is the per application launcher.
+  virtual bool IsPerAppLauncher();
+
+  // Returns true if LauncherDelegate can pin apps.
+  virtual bool CanPin() const { return false; }
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_DELEGATE_H_