ui/base/dragdrop/drag_source_win.cc

   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 #include "ui/base/dragdrop/drag_source_win.h"
   6
   7 namespace ui {
   8
   9 DragSourceWin::DragSourceWin() : cancel_drag_(false) {
  10 }
  11
  12 HRESULT DragSourceWin::QueryContinueDrag(BOOL escape_pressed, DWORD key_state) {
  13   if (cancel_drag_)
  14     return DRAGDROP_S_CANCEL;
  15
  16   if (escape_pressed) {
  17     OnDragSourceCancel();
  18     return DRAGDROP_S_CANCEL;
  19   }
  20
  21   if (!(key_state & MK_LBUTTON)) {
  22     OnDragSourceDrop();
  23     return DRAGDROP_S_DROP;
  24   }
  25
  26   OnDragSourceMove();
  27   return S_OK;
  28 }
  29
  30 HRESULT DragSourceWin::GiveFeedback(DWORD effect) {
  31   return DRAGDROP_S_USEDEFAULTCURSORS;
  32 }
  33
  34 HRESULT DragSourceWin::QueryInterface(const IID& iid, void** object) {
  35   *object = NULL;
  36   if (IsEqualIID(iid, IID_IUnknown) || IsEqualIID(iid, IID_IDropSource)) {
  37     *object = this;
  38   } else {
  39     return E_NOINTERFACE;
  40   }
  41   AddRef();
  42   return S_OK;
  43 }
  44
  45 ULONG DragSourceWin::AddRef() {
  46   base::RefCountedThreadSafe<DragSourceWin>::AddRef();
  47   return 0;
  48 }
  49
  50 ULONG DragSourceWin::Release() {
  51   base::RefCountedThreadSafe<DragSourceWin>::Release();
  52   return 0;
  53 }
  54
  55 }  // namespace ui