Refactor intra-strip panel drags by introducing PanelDragController.

chrome/browser/ui/panels/panel_manager.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 CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_
 #pragma once
 
 #include <vector>
 #include "base/basictypes.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/timer.h"
 #include "chrome/browser/ui/panels/auto_hiding_desktop_bar.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "ui/gfx/rect.h"
 
 class Browser;
+class DetachedPanelStrip;
+class DockedPanelStrip;
+class OverflowPanelStrip;
+class PanelDragController;
 class PanelMouseWatcher;
-class OverflowPanelStrip;
-class DockedPanelStrip;
 
 // This class manages a set of panels.
 class PanelManager : public AutoHidingDesktopBar::Observer {
  public:
   // Returns a single instance.
   static PanelManager* GetInstance();
 
   // Returns true if panels should be used for the extension.
   static bool ShouldUsePanels(const std::string& extension_id);
 
   // Called when the display is changed, i.e. work area is updated.
   void OnDisplayChanged();
 
   // Creates a panel and returns it. The panel might be queued for display
   // later.
   Panel* CreatePanel(Browser* browser);
 
   void Remove(Panel* panel);
 
   // Close all panels (asynchronous). Panels will be removed after closing.
   void CloseAll();
 
   // Asynchronous confirmation of panel having been removed.
   void OnPanelRemoved(Panel* panel);
 
   // Drags the given panel.
+  bool CanDrag(Panel* panel) const;
   void StartDragging(Panel* panel);
-  void Drag(int delta_x);
+  void Drag(int delta_x, int delta_y);
   void EndDragging(bool cancelled);
 
   // Invoked when a panel's expansion state changes.
   void OnPanelExpansionStateChanged(Panel* panel);
 
   // Invoked when the preferred window size of the given panel might need to
   // get changed.
   void OnPreferredWindowSizeChanged(
       Panel* panel, const gfx::Size& preferred_window_size);
 
@@ skipping 10 matching lines @@
 
   // Returns the next browser window which could be either panel window or
   // tabbed window, to switch to if the given panel is going to be deactivated.
   // Returns NULL if such window cannot be found.
   BrowserWindow* GetNextBrowserWindowToActivate(Panel* panel) const;
 
   int num_panels() const;
   int StartingRightPosition() const;
   std::vector<Panel*> panels() const;
 
+  PanelDragController* drag_controller() const {
+    return drag_controller_.get();
+  }
+
   AutoHidingDesktopBar* auto_hiding_desktop_bar() const {
     return auto_hiding_desktop_bar_;
   }
 
   PanelMouseWatcher* mouse_watcher() const {
     return panel_mouse_watcher_.get();
   }
 
+  DetachedPanelStrip* detached_strip() const {
+    return detached_strip_.get();
+  }
+
   DockedPanelStrip* docked_strip() const {
     return docked_strip_.get();
   }
 
   bool is_full_screen() const { return is_full_screen_; }
   OverflowPanelStrip* overflow_strip() const {
     return overflow_strip_.get();
   }
 
   // Reduces time interval in tests to shorten test run time.
@@ skipping 56 matching lines @@
 
   // Tests if the current active app is in full screen mode.
   void CheckFullScreenMode();
 
   // Tests may want to use a mock panel mouse watcher.
   void SetMouseWatcher(PanelMouseWatcher* watcher);
 
   // Tests may want to shorten time intervals to reduce running time.
   static bool shorten_time_intervals_;
 
+  scoped_ptr<DetachedPanelStrip> detached_strip_;
   scoped_ptr<DockedPanelStrip> docked_strip_;
   scoped_ptr<OverflowPanelStrip> overflow_strip_;
 
+  scoped_ptr<PanelDragController> drag_controller_;
+
   // Use a mouse watcher to know when to bring up titlebars to "peek" at
   // minimized panels. Mouse movement is only tracked when there is a minimized
   // panel.
   scoped_ptr<PanelMouseWatcher> panel_mouse_watcher_;
 
   // The maximum work area avaialble. This area does not include the area taken
   // by the always-visible (non-auto-hiding) desktop bars.
   gfx::Rect work_area_;
 
   // The useable work area for computing the panel bounds. This area excludes
@@ skipping 12 matching lines @@
   // Timer used to track if the current active app is in full screen mode.
   base::RepeatingTimer<PanelManager> full_screen_mode_timer_;
 
   // True if current active app is in full screen mode.
   bool is_full_screen_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelManager);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_