Refactors launcher related ShellDelegate methods into standalone

class.

BUG=none
TEST=none
R=ben@chromium.org


Review URL: http://codereview.chromium.org/9403002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@122227 0039d316-1c4b-4281-b951-d872f2087c98

7 files changed, 75 insertions, 26 deletions

diff --git a/ash/launcher/launcher.cc b/ash/launcher/launcher.cc
index 4908aa1..891b789 100644
--- a/ash/launcher/launcher.cc
+++ b/ash/launcher/launcher.cc
@@ -4,6 +4,7 @@
 
 #include "ash/launcher/launcher.h"
 
+#include "ash/launcher/launcher_delegate.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/launcher/launcher_view.h"
 #include "ash/shell.h"
@@ -106,6 +107,7 @@ Launcher::Launcher(aura::Window* window_container)
       window_container_(window_container),
       delegate_view_(NULL) {
   model_.reset(new LauncherModel);
+  delegate_.reset(Shell::GetInstance()->delegate()->CreateLauncherDelegate());
 
   widget_.reset(new views::Widget);
   views::Widget::InitParams params(
@@ -116,7 +118,7 @@ Launcher::Launcher(aura::Window* window_container)
   params.parent = Shell::GetInstance()->GetContainer(
       ash::internal::kShellWindowId_LauncherContainer);
   internal::LauncherView* launcher_view =
-      new internal::LauncherView(model_.get());
+      new internal::LauncherView(model_.get(), delegate_.get());
   launcher_view->Init();
   delegate_view_ = new DelegateView;
   delegate_view_->AddChildView(launcher_view);
diff --git a/ash/launcher/launcher.h b/ash/launcher/launcher.h
index 612ebb2..f910367 100644
--- a/ash/launcher/launcher.h
+++ b/ash/launcher/launcher.h
@@ -20,6 +20,7 @@ class Widget;
 
 namespace ash {
 
+class LauncherDelegate;
 class LauncherModel;
 
 class ASH_EXPORT Launcher {
@@ -31,6 +32,8 @@ class ASH_EXPORT Launcher {
   void SetStatusWidth(int width);
   int GetStatusWidth();
 
+  LauncherDelegate* delegate() { return delegate_.get(); }
+
   LauncherModel* model() { return model_.get(); }
   views::Widget* widget() { return widget_.get(); }
 
@@ -54,6 +57,8 @@ class ASH_EXPORT Launcher {
   // Contents view of the widget. Houses the LauncherView.
   DelegateView* delegate_view_;
 
+  scoped_ptr<LauncherDelegate> delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(Launcher);
 };
 
diff --git a/ash/launcher/launcher_delegate.h b/ash/launcher/launcher_delegate.h
new file mode 100644
index 0000000..5dbb033
--- /dev/null
+++ b/ash/launcher/launcher_delegate.h
@@ -0,0 +1,38 @@
+// 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_
+#pragma once
+
+#include "ash/ash_export.h"
+#include "base/string16.h"
+
+namespace ash {
+
+struct LauncherItem;
+
+// Delegate for the Launcher.
+class ASH_EXPORT LauncherDelegate {
+ public:
+  virtual ~LauncherDelegate() {}
+
+  // Invoked when the user clicks on button in the launcher to create a new
+  // window.
+  virtual void CreateNewWindow() = 0;
+
+  // Invoked when the user clicks on a window entry in the launcher.
+  virtual void ItemClicked(const LauncherItem& item) = 0;
+
+  // Returns the resource id of the image to show on the browser shortcut
+  // button.
+  virtual int GetBrowserShortcutResourceId() = 0;
+
+  // Returns the title to display for the specified launcher item.
+  virtual string16 GetTitle(const LauncherItem& item) = 0;
+};
+
+}  // namespace ash
+
+#endif  // ASH_LAUNCHER_LAUNCHER_DELEGATE_H_
diff --git a/ash/launcher/launcher_view.cc b/ash/launcher/launcher_view.cc
index ec93a28..b95fcd8 100644
--- a/ash/launcher/launcher_view.cc
+++ b/ash/launcher/launcher_view.cc
@@ -5,6 +5,7 @@
 #include "ash/launcher/launcher_view.h"
 
 #include "ash/launcher/app_launcher_button.h"
+#include "ash/launcher/launcher_delegate.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/launcher/launcher_window_cycler.h"
 #include "ash/launcher/tabbed_launcher_button.h"
@@ -183,8 +184,9 @@ class LauncherView::StartFadeAnimationDelegate :
   DISALLOW_COPY_AND_ASSIGN(StartFadeAnimationDelegate);
 };
 
-LauncherView::LauncherView(LauncherModel* model)
+LauncherView::LauncherView(LauncherModel* model, LauncherDelegate* delegate)
     : model_(model),
+      delegate_(delegate),
       view_model_(new ViewModel),
       overflow_button_(NULL),
       dragging_(NULL),
@@ -328,14 +330,13 @@ views::View* LauncherView::CreateViewForItem(const LauncherItem& item) {
     case TYPE_BROWSER_SHORTCUT: {
       ResourceBundle& rb = ResourceBundle::GetSharedInstance();
       views::ImageButton* button = new AppLauncherButton(this, this);
-      ShellDelegate* delegate = Shell::GetInstance()->delegate();
-      int image_id = delegate ?
-          delegate->GetBrowserShortcutResourceId() :
+      int image_id = delegate_ ?
+          delegate_->GetBrowserShortcutResourceId() :
           IDR_AURA_LAUNCHER_BROWSER_SHORTCUT;
       button->SetImage(views::CustomButton::BS_NORMAL,
                        rb.GetImageNamed(image_id).ToSkBitmap());
       view = button;
-      cycler_.reset(new LauncherWindowCycler);
+      cycler_.reset(new LauncherWindowCycler(delegate_));
       break;
     }
 
@@ -418,8 +419,7 @@ void LauncherView::GetOverflowItems(std::vector<LauncherItem>* items) {
 
 void LauncherView::ShowOverflowMenu() {
 #if !defined(OS_MACOSX)
-  ShellDelegate* delegate = Shell::GetInstance()->delegate();
-  if (!delegate)
+  if (!delegate_)
     return;
 
   std::vector<LauncherItem> items;
@@ -429,10 +429,8 @@ void LauncherView::ShowOverflowMenu() {
 
   MenuDelegateImpl menu_delegate;
   ui::SimpleMenuModel menu_model(&menu_delegate);
-  for (size_t i = 0; i < items.size(); ++i) {
-    menu_model.AddItem(static_cast<int>(i),
-                       delegate->GetLauncherItemTitle(items[i]));
-  }
+  for (size_t i = 0; i < items.size(); ++i)
+    menu_model.AddItem(static_cast<int>(i), delegate_->GetTitle(items[i]));
   views::MenuModelAdapter menu_adapter(&menu_model);
   overflow_menu_runner_.reset(new views::MenuRunner(menu_adapter.CreateMenu()));
   gfx::Rect bounds(overflow_button_->size());
@@ -448,9 +446,7 @@ void LauncherView::ShowOverflowMenu() {
   LauncherItems::const_iterator window_iter = model_->ItemByID(activated_id);
   if (window_iter == model_->items().end())
     return;  // Window was deleted while menu was up.
-  if (!delegate)
-    return;
-  delegate->LauncherItemClicked(*window_iter);
+  delegate_->ItemClicked(*window_iter);
 #endif  // !defined(OS_MACOSX)
 }
 
@@ -618,8 +614,7 @@ void LauncherView::ButtonPressed(views::Button* sender,
   if (sender == overflow_button_)
     ShowOverflowMenu();
 
-  ShellDelegate* delegate = Shell::GetInstance()->delegate();
-  if (!delegate)
+  if (!delegate_)
     return;
   int view_index = view_model_->GetIndexOfView(sender);
   // May be -1 while in the process of animating closed.
@@ -629,7 +624,7 @@ void LauncherView::ButtonPressed(views::Button* sender,
   switch (model_->items()[view_index].type) {
     case TYPE_TABBED:
     case TYPE_APP:
-      delegate->LauncherItemClicked(model_->items()[view_index]);
+      delegate_->ItemClicked(model_->items()[view_index]);
       break;
 
     case TYPE_APP_LIST:
@@ -646,8 +641,7 @@ void LauncherView::ButtonPressed(views::Button* sender,
 }
 
 string16 LauncherView::GetAccessibleName(views::View* view) {
-  ShellDelegate* delegate = Shell::GetInstance()->delegate();
-  if (!delegate)
+  if (!delegate_)
     return string16();
   int view_index = view_model_->GetIndexOfView(view);
   // May be -1 while in the process of animating closed.
@@ -657,7 +651,7 @@ string16 LauncherView::GetAccessibleName(views::View* view) {
   switch (model_->items()[view_index].type) {
     case TYPE_TABBED:
     case TYPE_APP:
-      return delegate->GetLauncherItemTitle(model_->items()[view_index]);
+      return delegate_->GetTitle(model_->items()[view_index]);
 
     case TYPE_APP_LIST:
       return l10n_util::GetStringUTF16(IDS_AURA_APP_LIST_TITLE);
diff --git a/ash/launcher/launcher_view.h b/ash/launcher/launcher_view.h
index f43e369..f4173b5 100644
--- a/ash/launcher/launcher_view.h
+++ b/ash/launcher/launcher_view.h
@@ -21,6 +21,7 @@ class MenuRunner;
 
 namespace ash {
 
+class LauncherDelegate;
 struct LauncherItem;
 class LauncherModel;
 class LauncherWindowCycler;
@@ -33,7 +34,7 @@ class LauncherView : public views::WidgetDelegateView,
                      public views::ButtonListener,
                      public LauncherButtonHost {
  public:
-  explicit LauncherView(LauncherModel* model);
+  LauncherView(LauncherModel* model, LauncherDelegate* delegate);
   virtual ~LauncherView();
 
   void Init();
@@ -118,6 +119,9 @@ class LauncherView : public views::WidgetDelegateView,
   // The model; owned by Launcher.
   LauncherModel* model_;
 
+  // Delegate; owned by Launcher.
+  LauncherDelegate* delegate_;
+
   // Used to manage the set of active launcher buttons. There is a view per
   // item in |model_|.
   scoped_ptr<ViewModel> view_model_;
diff --git a/ash/launcher/launcher_window_cycler.cc b/ash/launcher/launcher_window_cycler.cc
index c689c4e..75f22ac 100644
--- a/ash/launcher/launcher_window_cycler.cc
+++ b/ash/launcher/launcher_window_cycler.cc
@@ -4,6 +4,7 @@
 
 #include "ash/launcher/launcher_window_cycler.h"
 
+#include "ash/launcher/launcher_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/wm/window_cycle_controller.h"
@@ -11,7 +12,8 @@
 
 namespace ash {
 
-LauncherWindowCycler::LauncherWindowCycler() {
+LauncherWindowCycler::LauncherWindowCycler(LauncherDelegate* delegate)
+    : delegate_(delegate) {
 }
 
 LauncherWindowCycler::~LauncherWindowCycler() {
@@ -27,7 +29,7 @@ void LauncherWindowCycler::Cycle() {
             ShellDelegate::SOURCE_LAUNCHER, ShellDelegate::ORDER_MRU)));
   }
   if (windows_->empty())
-    ash::Shell::GetInstance()->delegate()->CreateNewWindow();
+    delegate_->CreateNewWindow();
   else
     windows_->Step(WindowCycleList::FORWARD);
 }
diff --git a/ash/launcher/launcher_window_cycler.h b/ash/launcher/launcher_window_cycler.h
index 4ab3077..6a148e1 100644
--- a/ash/launcher/launcher_window_cycler.h
+++ b/ash/launcher/launcher_window_cycler.h
@@ -12,15 +12,16 @@
 
 namespace ash {
 
+class LauncherDelegate;
 class WindowCycleList;
 
 // LauncherWindowCycler is used when the user clicks the browser shortcut button
 // in the launcher. If there are no windows to cycle through a new one is
-// created (by way of ShellDelegate::CreateNewWindow), otherwise it cycles
+// created (by way of LauncherDelegate::CreateNewWindow), otherwise it cycles
 // through the existing windows until Reset() is invoked.
 class ASH_EXPORT LauncherWindowCycler {
  public:
-  LauncherWindowCycler();
+  explicit LauncherWindowCycler(LauncherDelegate* delegate);
   ~LauncherWindowCycler();
 
   // Invoked each time the button is pressed on the browser shortcut. If not
@@ -35,6 +36,9 @@ class ASH_EXPORT LauncherWindowCycler {
  private:
   scoped_ptr<WindowCycleList> windows_;
 
+  // Owned by Launcher.
+  LauncherDelegate* delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(LauncherWindowCycler);
 };