ui/views/widget/drop_target_win.h

   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 UI_VIEWS_WIDGET_DROP_TARGET_WIN_H_
   6 #define UI_VIEWS_WIDGET_DROP_TARGET_WIN_H_
   7
   8 #include "ui/base/dragdrop/drop_target_win.h"
   9 #include "ui/views/widget/drop_helper.h"
  10
  11 namespace views {
  12
  13 class View;
  14 namespace internal {
  15 class RootView;
  16 }
  17
  18 // DropTargetWin takes care of managing drag and drop for NativeWidgetWin. It
  19 // converts Windows OLE drop messages into Views drop messages.
  20 //
  21 // DropTargetWin uses DropHelper to manage the appropriate view to target
  22 // drop messages at.
  23 class DropTargetWin : public ui::DropTargetWin {
  24  public:
  25   explicit DropTargetWin(internal::RootView* root_view);
  26   virtual ~DropTargetWin();
  27
  28   // If a drag and drop is underway and view is the current drop target, the
  29   // drop target is set to null.
  30   // This is invoked when a View is removed from the RootView to make sure
  31   // we don't target a view that was removed during dnd.
  32   void ResetTargetViewIfEquals(View* view);
  33
  34  protected:
  35   virtual DWORD OnDragOver(IDataObject* data_object,
  36                            DWORD key_state,
  37                            POINT cursor_position,
  38                            DWORD effect);
  39
  40   virtual void OnDragLeave(IDataObject* data_object);
  41
  42   virtual DWORD OnDrop(IDataObject* data_object,
  43                        DWORD key_state,
  44                        POINT cursor_position,
  45                        DWORD effect);
  46
  47  private:
  48   views::DropHelper helper_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(DropTargetWin);
  51 };
  52
  53 }  // namespace views
  54
  55 #endif  // UI_VIEWS_WIDGET_DROP_TARGET_WIN_H_