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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_DROP_TARGET_WIN_H_
      6 #define CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_
      7 #pragma once
      8 
      9 #include "base/memory/scoped_ptr.h"
     10 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
     11 #include "ui/base/dragdrop/drop_target.h"
     12 
     13 class InterstitialDropTarget;
     14 class RenderViewHost;
     15 class TabContents;
     16 
     17 // A helper object that provides drop capabilities to a TabContents. The
     18 // DropTarget handles drags that enter the region of the TabContents by
     19 // passing on the events to the renderer.
     20 class WebDropTarget : public ui::DropTarget {
     21  public:
     22   // Create a new WebDropTarget associating it with the given HWND and
     23   // TabContents.
     24   WebDropTarget(HWND source_hwnd, TabContents* contents);
     25   virtual ~WebDropTarget();
     26 
     27   void set_drag_cursor(WebKit::WebDragOperation op) {
     28     drag_cursor_ = op;
     29   }
     30 
     31  protected:
     32   virtual DWORD OnDragEnter(IDataObject* data_object,
     33                             DWORD key_state,
     34                             POINT cursor_position,
     35                             DWORD effect);
     36 
     37   virtual DWORD OnDragOver(IDataObject* data_object,
     38                            DWORD key_state,
     39                            POINT cursor_position,
     40                            DWORD effect);
     41 
     42   virtual void OnDragLeave(IDataObject* data_object);
     43 
     44   virtual DWORD OnDrop(IDataObject* data_object,
     45                        DWORD key_state,
     46                        POINT cursor_position,
     47                        DWORD effect);
     48 
     49  private:
     50   // Our associated TabContents.
     51   TabContents* tab_contents_;
     52 
     53   // We keep track of the render view host we're dragging over.  If it changes
     54   // during a drag, we need to re-send the DragEnter message.  WARNING:
     55   // this pointer should never be dereferenced.  We only use it for comparing
     56   // pointers.
     57   RenderViewHost* current_rvh_;
     58 
     59   // Used to determine what cursor we should display when dragging over web
     60   // content area.  This can be updated async during a drag operation.
     61   WebKit::WebDragOperation drag_cursor_;
     62 
     63   // A special drop target handler for when we try to d&d while an interstitial
     64   // page is showing.
     65   scoped_ptr<InterstitialDropTarget> interstitial_drop_target_;
     66 
     67   DISALLOW_COPY_AND_ASSIGN(WebDropTarget);
     68 };
     69 
     70 #endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_
     71