1 // Copyright (c) 2006-2008 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 "base/base_drag_source.h" 6 7 /////////////////////////////////////////////////////////////////////////////// 8 // BaseDragSource, public: 9 BaseDragSource()10BaseDragSource::BaseDragSource() : cancel_drag_(false) { 11 } 12 13 /////////////////////////////////////////////////////////////////////////////// 14 // BaseDragSource, IDropSource implementation: 15 QueryContinueDrag(BOOL escape_pressed,DWORD key_state)16HRESULT BaseDragSource::QueryContinueDrag(BOOL escape_pressed, 17 DWORD key_state) { 18 if (cancel_drag_) 19 return DRAGDROP_S_CANCEL; 20 21 if (escape_pressed) { 22 OnDragSourceCancel(); 23 return DRAGDROP_S_CANCEL; 24 } 25 26 if (!(key_state & MK_LBUTTON)) { 27 OnDragSourceDrop(); 28 return DRAGDROP_S_DROP; 29 } 30 31 OnDragSourceMove(); 32 return S_OK; 33 } 34 GiveFeedback(DWORD effect)35HRESULT BaseDragSource::GiveFeedback(DWORD effect) { 36 return DRAGDROP_S_USEDEFAULTCURSORS; 37 } 38 39 /////////////////////////////////////////////////////////////////////////////// 40 // BaseDragSource, IUnknown implementation: 41 QueryInterface(const IID & iid,void ** object)42HRESULT BaseDragSource::QueryInterface(const IID& iid, void** object) { 43 *object = NULL; 44 if (IsEqualIID(iid, IID_IUnknown) || IsEqualIID(iid, IID_IDropSource)) { 45 *object = this; 46 } else { 47 return E_NOINTERFACE; 48 } 49 AddRef(); 50 return S_OK; 51 } 52 AddRef()53ULONG BaseDragSource::AddRef() { 54 base::RefCountedThreadSafe<BaseDragSource>::AddRef(); 55 return 0; 56 } 57 Release()58ULONG BaseDragSource::Release() { 59 base::RefCountedThreadSafe<BaseDragSource>::Release(); 60 return 0; 61 } 62