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 set_effect(DWORD effect)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