Improves tab overview.

chrome/browser/views/tabs/tab_overview_drag_controller.h

 // Copyright (c) 2009 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 CHROME_BROWSER_VIEWS_TABS_TAB_OVERVIEW_DRAG_CONTROLLER_H_
 #define CHROME_BROWSER_VIEWS_TABS_TAB_OVERVIEW_DRAG_CONTROLLER_H_
 
 #include "base/gfx/point.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/tab_contents/tab_contents_delegate.h"
 #include "chrome/common/notification_registrar.h"
 
+class Browser;
 class TabOverviewController;
 class TabOverviewGrid;
 class TabStripModel;
 
 namespace views {
 class Widget;
 }
 
 // TabOverviewDragController handles dragging cells in a TabOverviewGrid.
 // There are a couple of interesting states TabOverviewDragController may
@@ skipping 10 matching lines @@
 // Finally CommitDrag is invoked if the user releases the mouse, or RevertDrag
 // if the drag is canceled some how.
 //
 // NOTE: all coordinates passed in are relative to the TabOverviewGrid.
 class TabOverviewDragController : public TabContentsDelegate,
                                   public NotificationObserver {
  public:
   explicit TabOverviewDragController(TabOverviewController* controller);
   ~TabOverviewDragController();
 
-  // Invoked to prepare the TabOverviewDragController for a drag. Returns true
-  // if over a cell, false if the mouse isn't over a valid location.
+  // Sets whether the mouse is over a mini-window.
+  void set_mouse_over_mini_window(bool over_mini_window) {
+    mouse_over_mini_window_ = over_mini_window;
+  }
+
+  // Prepares the TabOverviewDragController for a drag. Returns true if over a
+  // cell, false if the mouse isn't over a valid location.
   bool Configure(const gfx::Point& location);
 
   // Invoked as the user drags the mouse.
   void Drag(const gfx::Point& location);
 
-  // Invoked to commit the drag, typically when the user pressed enter.
+  // Commits the drag, typically when the user releases the mouse.
   void CommitDrag(const gfx::Point& location);
 
-  // Invoked to rever the drag.
-  void RevertDrag();
+  // Reverts the drag. Use true if the revert is the result of the tab being
+  // destroyed.
+  void RevertDrag(bool tab_destroyed);
 
   bool modifying_model() const { return modifying_model_; }
   TabOverviewGrid* grid() const;
   TabStripModel* model() const;
 
   // Overridden from NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
@@ skipping 79 matching lines @@
   // drag when the model changes.
   bool modifying_model_;
 
   // Handles registering for notifications.
   NotificationRegistrar registrar_;
 
   // Once a tab is detached a window is created containing a cell and moved
   // around; this is that window.
   views::Widget* detached_window_;
 
+  // When a tab is detached from a browser with a single tab we hide the
+  // browser. If this is non-null it means a single tab has been detached
+  // and this is the browser it was detached from.
+  Browser* hidden_browser_;
+
+  // Whether the mouse is over a mini window.
+  bool mouse_over_mini_window_;
+
+  // Size of the browser window. Cached in case browser() becomes NULL (as
+  // happens when the user drags over a region that shouldn't show the tab
+  // overview).
+  gfx::Size browser_window_size_;
+
   DISALLOW_COPY_AND_ASSIGN(TabOverviewDragController);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_TABS_TAB_OVERVIEW_DRAG_CONTROLLER_H_