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| 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_drop_target.h" | |
| 6 | |
| 7 #include <shlobj.h> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 | |
| 11 /////////////////////////////////////////////////////////////////////////////// | |
| 12 | |
| 13 IDropTargetHelper* BaseDropTarget::cached_drop_target_helper_ = NULL; | |
| 14 int32 BaseDropTarget::drag_identity_ = 0; | |
| 15 | |
| 16 BaseDropTarget::BaseDropTarget(HWND hwnd) | |
| 17 : hwnd_(hwnd), | |
| 18 suspended_(false), | |
| 19 ref_count_(0) { | |
| 20 DCHECK(hwnd); | |
| 21 HRESULT result = RegisterDragDrop(hwnd, this); | |
| 22 DCHECK(SUCCEEDED(result)); | |
| 23 } | |
| 24 | |
| 25 BaseDropTarget::~BaseDropTarget() { | |
| 26 } | |
| 27 | |
| 28 // static | |
| 29 IDropTargetHelper* BaseDropTarget::DropHelper() { | |
| 30 if (!cached_drop_target_helper_) { | |
| 31 CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER, | |
| 32 IID_IDropTargetHelper, | |
| 33 reinterpret_cast<void**>(&cached_drop_target_helper_)); | |
| 34 } | |
| 35 return cached_drop_target_helper_; | |
| 36 } | |
| 37 | |
| 38 /////////////////////////////////////////////////////////////////////////////// | |
| 39 // BaseDropTarget, IDropTarget implementation: | |
| 40 | |
| 41 HRESULT BaseDropTarget::DragEnter(IDataObject* data_object, | |
| 42 DWORD key_state, | |
| 43 POINTL cursor_position, | |
| 44 DWORD* effect) { | |
| 45 // Tell the helper that we entered so it can update the drag image. | |
| 46 IDropTargetHelper* drop_helper = DropHelper(); | |
| 47 if (drop_helper) { | |
| 48 drop_helper->DragEnter(GetHWND(), data_object, | |
| 49 reinterpret_cast<POINT*>(&cursor_position), *effect); | |
| 50 } | |
| 51 | |
| 52 // You can't drag and drop within the same HWND. | |
| 53 if (suspended_) { | |
| 54 *effect = DROPEFFECT_NONE; | |
| 55 return S_OK; | |
| 56 } | |
| 57 | |
| 58 // Update the drag identity, skipping 0. | |
| 59 if (++drag_identity_ == 0) | |
| 60 ++drag_identity_; | |
| 61 | |
| 62 current_data_object_ = data_object; | |
| 63 POINT screen_pt = { cursor_position.x, cursor_position.y }; | |
| 64 *effect = OnDragEnter(current_data_object_, key_state, screen_pt, *effect); | |
| 65 return S_OK; | |
| 66 } | |
| 67 | |
| 68 HRESULT BaseDropTarget::DragOver(DWORD key_state, | |
| 69 POINTL cursor_position, | |
| 70 DWORD* effect) { | |
| 71 // Tell the helper that we moved over it so it can update the drag image. | |
| 72 IDropTargetHelper* drop_helper = DropHelper(); | |
| 73 if (drop_helper) | |
| 74 drop_helper->DragOver(reinterpret_cast<POINT*>(&cursor_position), *effect); | |
| 75 | |
| 76 if (suspended_) { | |
| 77 *effect = DROPEFFECT_NONE; | |
| 78 return S_OK; | |
| 79 } | |
| 80 | |
| 81 POINT screen_pt = { cursor_position.x, cursor_position.y }; | |
| 82 *effect = OnDragOver(current_data_object_, key_state, screen_pt, *effect); | |
| 83 return S_OK; | |
| 84 } | |
| 85 | |
| 86 HRESULT BaseDropTarget::DragLeave() { | |
| 87 // Tell the helper that we moved out of it so it can update the drag image. | |
| 88 IDropTargetHelper* drop_helper = DropHelper(); | |
| 89 if (drop_helper) | |
| 90 drop_helper->DragLeave(); | |
| 91 | |
| 92 if (suspended_) | |
| 93 return S_OK; | |
| 94 | |
| 95 OnDragLeave(current_data_object_); | |
| 96 | |
| 97 current_data_object_ = NULL; | |
| 98 return S_OK; | |
| 99 } | |
| 100 | |
| 101 HRESULT BaseDropTarget::Drop(IDataObject* data_object, | |
| 102 DWORD key_state, | |
| 103 POINTL cursor_position, | |
| 104 DWORD* effect) { | |
| 105 // Tell the helper that we dropped onto it so it can update the drag image. | |
| 106 IDropTargetHelper* drop_helper = DropHelper(); | |
| 107 if (drop_helper) { | |
| 108 drop_helper->Drop(current_data_object_, | |
| 109 reinterpret_cast<POINT*>(&cursor_position), *effect); | |
| 110 } | |
| 111 | |
| 112 if (suspended_) { | |
| 113 *effect = DROPEFFECT_NONE; | |
| 114 return S_OK; | |
| 115 } | |
| 116 | |
| 117 POINT screen_pt = { cursor_position.x, cursor_position.y }; | |
| 118 *effect = OnDrop(current_data_object_, key_state, screen_pt, *effect); | |
| 119 return S_OK; | |
| 120 } | |
| 121 | |
| 122 /////////////////////////////////////////////////////////////////////////////// | |
| 123 // BaseDropTarget, IUnknown implementation: | |
| 124 | |
| 125 HRESULT BaseDropTarget::QueryInterface(const IID& iid, void** object) { | |
| 126 *object = NULL; | |
| 127 if (IsEqualIID(iid, IID_IUnknown) || IsEqualIID(iid, IID_IDropTarget)) { | |
| 128 *object = this; | |
| 129 } else { | |
| 130 return E_NOINTERFACE; | |
| 131 } | |
| 132 AddRef(); | |
| 133 return S_OK; | |
| 134 } | |
| 135 | |
| 136 ULONG BaseDropTarget::AddRef() { | |
| 137 return ++ref_count_; | |
| 138 } | |
| 139 | |
| 140 ULONG BaseDropTarget::Release() { | |
| 141 if (--ref_count_ == 0) { | |
| 142 delete this; | |
| 143 return 0U; | |
| 144 } | |
| 145 return ref_count_; | |
| 146 } | |
| 147 | |
| 148 DWORD BaseDropTarget::OnDragEnter(IDataObject* data_object, | |
| 149 DWORD key_state, | |
| 150 POINT cursor_position, | |
| 151 DWORD effect) { | |
| 152 return DROPEFFECT_NONE; | |
| 153 } | |
| 154 | |
| 155 DWORD BaseDropTarget::OnDragOver(IDataObject* data_object, | |
| 156 DWORD key_state, | |
| 157 POINT cursor_position, | |
| 158 DWORD effect) { | |
| 159 return DROPEFFECT_NONE; | |
| 160 } | |
| 161 | |
| 162 void BaseDropTarget::OnDragLeave(IDataObject* data_object) { | |
| 163 } | |
| 164 | |
| 165 DWORD BaseDropTarget::OnDrop(IDataObject* data_object, | |
| 166 DWORD key_state, | |
| 167 POINT cursor_position, | |
| 168 DWORD effect) { | |
| 169 return DROPEFFECT_NONE; | |
| 170 } | |
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Chromium Code Reviews
Issue 3822007:
Move BaseDropTarget and BaseDragSource from base to app/win. Remove the "Base... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/