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| 1 // Copyright (c) 2010 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 "app/win/drop_target.h" | |
| 6 | |
| 7 #include <shlobj.h> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 | |
| 11 namespace app { | |
| 12 namespace win { | |
| 13 | |
| 14 IDropTargetHelper* DropTarget::cached_drop_target_helper_ = NULL; | |
| 15 int32 DropTarget::drag_identity_ = 0; | |
| 16 | |
| 17 DropTarget::DropTarget(HWND hwnd) | |
| 18 : hwnd_(hwnd), | |
| 19 suspended_(false), | |
| 20 ref_count_(0) { | |
| 21 DCHECK(hwnd); | |
| 22 HRESULT result = RegisterDragDrop(hwnd, this); | |
| 23 DCHECK(SUCCEEDED(result)); | |
| 24 } | |
| 25 | |
| 26 DropTarget::~DropTarget() { | |
| 27 } | |
| 28 | |
| 29 // static | |
| 30 IDropTargetHelper* DropTarget::DropHelper() { | |
| 31 if (!cached_drop_target_helper_) { | |
| 32 CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER, | |
| 33 IID_IDropTargetHelper, | |
| 34 reinterpret_cast<void**>(&cached_drop_target_helper_)); | |
| 35 } | |
| 36 return cached_drop_target_helper_; | |
| 37 } | |
| 38 | |
| 39 /////////////////////////////////////////////////////////////////////////////// | |
| 40 // DropTarget, IDropTarget implementation: | |
| 41 | |
| 42 HRESULT DropTarget::DragEnter(IDataObject* data_object, | |
| 43 DWORD key_state, | |
| 44 POINTL cursor_position, | |
| 45 DWORD* effect) { | |
| 46 // Tell the helper that we entered so it can update the drag image. | |
| 47 IDropTargetHelper* drop_helper = DropHelper(); | |
| 48 if (drop_helper) { | |
| 49 drop_helper->DragEnter(GetHWND(), data_object, | |
| 50 reinterpret_cast<POINT*>(&cursor_position), *effect); | |
| 51 } | |
| 52 | |
| 53 // You can't drag and drop within the same HWND. | |
| 54 if (suspended_) { | |
| 55 *effect = DROPEFFECT_NONE; | |
| 56 return S_OK; | |
| 57 } | |
| 58 | |
| 59 // Update the drag identity, skipping 0. | |
| 60 if (++drag_identity_ == 0) | |
| 61 ++drag_identity_; | |
| 62 | |
| 63 current_data_object_ = data_object; | |
| 64 POINT screen_pt = { cursor_position.x, cursor_position.y }; | |
| 65 *effect = OnDragEnter(current_data_object_, key_state, screen_pt, *effect); | |
| 66 return S_OK; | |
| 67 } | |
| 68 | |
| 69 HRESULT DropTarget::DragOver(DWORD key_state, | |
| 70 POINTL cursor_position, | |
| 71 DWORD* effect) { | |
| 72 // Tell the helper that we moved over it so it can update the drag image. | |
| 73 IDropTargetHelper* drop_helper = DropHelper(); | |
| 74 if (drop_helper) | |
| 75 drop_helper->DragOver(reinterpret_cast<POINT*>(&cursor_position), *effect); | |
| 76 | |
| 77 if (suspended_) { | |
| 78 *effect = DROPEFFECT_NONE; | |
| 79 return S_OK; | |
| 80 } | |
| 81 | |
| 82 POINT screen_pt = { cursor_position.x, cursor_position.y }; | |
| 83 *effect = OnDragOver(current_data_object_, key_state, screen_pt, *effect); | |
| 84 return S_OK; | |
| 85 } | |
| 86 | |
| 87 HRESULT DropTarget::DragLeave() { | |
| 88 // Tell the helper that we moved out of it so it can update the drag image. | |
| 89 IDropTargetHelper* drop_helper = DropHelper(); | |
| 90 if (drop_helper) | |
| 91 drop_helper->DragLeave(); | |
| 92 | |
| 93 if (suspended_) | |
| 94 return S_OK; | |
| 95 | |
| 96 OnDragLeave(current_data_object_); | |
| 97 | |
| 98 current_data_object_ = NULL; | |
| 99 return S_OK; | |
| 100 } | |
| 101 | |
| 102 HRESULT DropTarget::Drop(IDataObject* data_object, | |
| 103 DWORD key_state, | |
| 104 POINTL cursor_position, | |
| 105 DWORD* effect) { | |
| 106 // Tell the helper that we dropped onto it so it can update the drag image. | |
| 107 IDropTargetHelper* drop_helper = DropHelper(); | |
| 108 if (drop_helper) { | |
| 109 drop_helper->Drop(current_data_object_, | |
| 110 reinterpret_cast<POINT*>(&cursor_position), *effect); | |
| 111 } | |
| 112 | |
| 113 if (suspended_) { | |
| 114 *effect = DROPEFFECT_NONE; | |
| 115 return S_OK; | |
| 116 } | |
| 117 | |
| 118 POINT screen_pt = { cursor_position.x, cursor_position.y }; | |
| 119 *effect = OnDrop(current_data_object_, key_state, screen_pt, *effect); | |
| 120 return S_OK; | |
| 121 } | |
| 122 | |
| 123 /////////////////////////////////////////////////////////////////////////////// | |
| 124 // DropTarget, IUnknown implementation: | |
| 125 | |
| 126 HRESULT DropTarget::QueryInterface(const IID& iid, void** object) { | |
| 127 *object = NULL; | |
| 128 if (IsEqualIID(iid, IID_IUnknown) || IsEqualIID(iid, IID_IDropTarget)) { | |
| 129 *object = this; | |
| 130 } else { | |
| 131 return E_NOINTERFACE; | |
| 132 } | |
| 133 AddRef(); | |
| 134 return S_OK; | |
| 135 } | |
| 136 | |
| 137 ULONG DropTarget::AddRef() { | |
| 138 return ++ref_count_; | |
| 139 } | |
| 140 | |
| 141 ULONG DropTarget::Release() { | |
| 142 if (--ref_count_ == 0) { | |
| 143 delete this; | |
| 144 return 0U; | |
| 145 } | |
| 146 return ref_count_; | |
| 147 } | |
| 148 | |
| 149 DWORD DropTarget::OnDragEnter(IDataObject* data_object, | |
| 150 DWORD key_state, | |
| 151 POINT cursor_position, | |
| 152 DWORD effect) { | |
| 153 return DROPEFFECT_NONE; | |
| 154 } | |
| 155 | |
| 156 DWORD DropTarget::OnDragOver(IDataObject* data_object, | |
| 157 DWORD key_state, | |
| 158 POINT cursor_position, | |
| 159 DWORD effect) { | |
| 160 return DROPEFFECT_NONE; | |
| 161 } | |
| 162 | |
| 163 void DropTarget::OnDragLeave(IDataObject* data_object) { | |
| 164 } | |
| 165 | |
| 166 DWORD DropTarget::OnDrop(IDataObject* data_object, | |
| 167 DWORD key_state, | |
| 168 POINT cursor_position, | |
| 169 DWORD effect) { | |
| 170 return DROPEFFECT_NONE; | |
| 171 } | |
| 172 | |
| 173 } // namespace win | |
| 174 } // namespace app | |
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Chromium Code Reviews
Issue 6250014:
Move more dnd related files to ui/base (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/