Allow dynamic switching in and out of sidetabs mode.

chrome/browser/views/tabs/browser_tab_strip_controller.cc

Index: chrome/browser/views/tabs/browser_tab_strip_controller.cc
===================================================================
--- chrome/browser/views/tabs/browser_tab_strip_controller.cc	(revision 41630)
+++ chrome/browser/views/tabs/browser_tab_strip_controller.cc	(working copy)
@@ -5,8 +5,69 @@
 #include "chrome/browser/views/tabs/browser_tab_strip_controller.h"
 
 #include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/tab_menu_model.h"
 #include "chrome/browser/views/tabs/side_tab_strip.h"
+#include "views/controls/menu/menu_2.h"
+#include "views/widget/widget.h"
 
+class BrowserTabStripController::TabContextMenuContents
+    : public menus::SimpleMenuModel::Delegate {
+ public:
+  TabContextMenuContents(int tab_index, BrowserTabStripController* controller)
+      : ALLOW_THIS_IN_INITIALIZER_LIST(model_(this)),
+        tab_index_(tab_index),
+        controller_(controller) {
+    Build();
+  }
+  virtual ~TabContextMenuContents() {
+    menu_->CancelMenu();
+  }
+
+  void RunMenuAt(const gfx::Point& point) {
+    menu_->RunMenuAt(point, views::Menu2::ALIGN_TOPLEFT);
+  }
+
+  // Overridden from menus::SimpleMenuModel::Delegate:
+  virtual bool IsCommandIdChecked(int command_id) const {
+    return controller_->IsCommandCheckedForTab(
+        static_cast<TabStripModel::ContextMenuCommand>(command_id),
+        tab_index_);
+  }
+  virtual bool IsCommandIdEnabled(int command_id) const {
+    return controller_->IsCommandEnabledForTab(
+        static_cast<TabStripModel::ContextMenuCommand>(command_id),
+        tab_index_);
+  }
+  virtual bool GetAcceleratorForCommandId(
+      int command_id,
+      menus::Accelerator* accelerator) {
+    return controller_->tabstrip_->GetWidget()->GetAccelerator(command_id,
+                                                               accelerator);
+  }
+  virtual void ExecuteCommand(int command_id) {
+    controller_->ExecuteCommandForTab(
+        static_cast<TabStripModel::ContextMenuCommand>(command_id),
+        tab_index_);
+  }
+
+ private:
+  void Build() {
+    menu_.reset(new views::Menu2(&model_));
+  }
+
+  TabMenuModel model_;
+  scoped_ptr<views::Menu2> menu_;
+
+  // The index of the tab we are showing the context menu for.
+  int tab_index_;
+
+  // A pointer back to our hosting controller, for command state information.
+  BrowserTabStripController* controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabContextMenuContents);
+};
+
+
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserTabStripController, public:
 
@@ -18,8 +79,42 @@
 }
 
 BrowserTabStripController::~BrowserTabStripController() {
+  model_->RemoveObserver(this);
 }
 
+void BrowserTabStripController::InitFromModel() {
+  // Walk the model, calling our insertion observer method for each item within
+  // it.
+  for (int i = 0; i < model_->count(); ++i) {
+    TabInsertedAt(model_->GetTabContentsAt(i), i,
+                  i == model_->selected_index());
+  }
+}
+
+bool BrowserTabStripController::IsCommandEnabledForTab(
+    TabStripModel::ContextMenuCommand command_id, int tab_index) const {
+  if (model_->ContainsIndex(tab_index))
+    return model_->IsContextMenuCommandEnabled(tab_index, command_id);
+  return false;
+}
+
+bool BrowserTabStripController::IsCommandCheckedForTab(
+    TabStripModel::ContextMenuCommand command_id, int tab_index) const {
+  // TODO(beng): move to TabStripModel, see note in IsTabPinned.
+  if (command_id == TabStripModel::CommandTogglePinned)
+    return false;
+
+  if (model_->ContainsIndex(tab_index))
+    return model_->IsContextMenuCommandChecked(tab_index, command_id);
+  return false;
+}
+
+void BrowserTabStripController::ExecuteCommandForTab(
+    TabStripModel::ContextMenuCommand command_id, int tab_index) {
+  if (model_->ContainsIndex(tab_index))
+    model_->ExecuteContextMenuCommand(tab_index, command_id);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserTabStripController, SideTabStripModel implementation:
 
@@ -53,6 +148,13 @@
   model_->CloseTabContentsAt(index);
 }
 
+void BrowserTabStripController::ShowContextMenu(int index,
+                                                const gfx::Point& p) {
+  if (!context_menu_contents_.get())
+    context_menu_contents_.reset(new TabContextMenuContents(index, this));
+  context_menu_contents_->RunMenuAt(p);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserTabStripController, TabStripModelObserver implementation: