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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_
      6 #define CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_
      7 #pragma once
      8 
      9 #include "base/basictypes.h"
     10 #include "content/common/notification_observer.h"
     11 #include "content/common/notification_registrar.h"
     12 #include "ui/base/dragdrop/drag_source.h"
     13 #include "ui/gfx/native_widget_types.h"
     14 #include "ui/gfx/point.h"
     15 
     16 class RenderViewHost;
     17 class TabContents;
     18 
     19 // An IDropSource implementation for a TabContents. Handles notifications sent
     20 // by an active drag-drop operation as the user mouses over other drop targets
     21 // on their system. This object tells Windows whether or not the drag should
     22 // continue, and supplies the appropriate cursors.
     23 class WebDragSource : public ui::DragSource,
     24                       public NotificationObserver {
     25  public:
     26   // Create a new DragSource for a given HWND and TabContents.
     27   WebDragSource(gfx::NativeWindow source_wnd, TabContents* tab_contents);
     28   virtual ~WebDragSource();
     29 
     30   // NotificationObserver implementation.
     31   virtual void Observe(NotificationType type,
     32                        const NotificationSource& source,
     33                        const NotificationDetails& details);
     34 
     35   void set_effect(DWORD effect) { effect_ = effect; }
     36 
     37  protected:
     38   // ui::DragSource
     39   virtual void OnDragSourceCancel();
     40   virtual void OnDragSourceDrop();
     41   virtual void OnDragSourceMove();
     42 
     43  private:
     44   // Cannot construct thusly.
     45   WebDragSource();
     46 
     47   // OnDragSourceDrop schedules its main work to be done after IDropTarget::Drop
     48   // by posting a task to this function.
     49   void DelayedOnDragSourceDrop();
     50 
     51   // Keep a reference to the window so we can translate the cursor position.
     52   gfx::NativeWindow source_wnd_;
     53 
     54   // We use this as a channel to the renderer to tell it about various drag
     55   // drop events that it needs to know about (such as when a drag operation it
     56   // initiated terminates).
     57   RenderViewHost* render_view_host_;
     58 
     59   NotificationRegistrar registrar_;
     60 
     61   DWORD effect_;
     62 
     63   DISALLOW_COPY_AND_ASSIGN(WebDragSource);
     64 };
     65 
     66 #endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_
     67