license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 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. |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 4 | |
| 5 | #include <windows.h> |
| 6 | #include <shlobj.h> |
| 7 | |
| 8 | #include "base/base_drop_target.h" |
| 9 | |
| 10 | #include "base/logging.h" |
| 11 | |
| 12 | /////////////////////////////////////////////////////////////////////////////// |
| 13 | |
| 14 | IDropTargetHelper* BaseDropTarget::cached_drop_target_helper_ = NULL; |
| 15 | |
| 16 | BaseDropTarget::BaseDropTarget(HWND hwnd) |
| 17 | : suspend_(false), |
| 18 | ref_count_(0), |
| 19 | hwnd_(hwnd) { |
| 20 | DCHECK(hwnd); |
| 21 | HRESULT result = RegisterDragDrop(hwnd, this); |
| 22 | } |
| 23 | |
| 24 | BaseDropTarget::~BaseDropTarget() { |
| 25 | } |
| 26 | |
| 27 | // static |
| 28 | IDropTargetHelper* BaseDropTarget::DropHelper() { |
| 29 | if (!cached_drop_target_helper_) { |
| 30 | CoCreateInstance(CLSID_DragDropHelper, 0, CLSCTX_INPROC_SERVER, |
| 31 | IID_IDropTargetHelper, |
| 32 | reinterpret_cast<void**>(&cached_drop_target_helper_)); |
| 33 | } |
| 34 | return cached_drop_target_helper_; |
| 35 | } |
| 36 | |
| 37 | /////////////////////////////////////////////////////////////////////////////// |
| 38 | // BaseDropTarget, IDropTarget implementation: |
| 39 | |
| 40 | HRESULT BaseDropTarget::DragEnter(IDataObject* data_object, |
| 41 | DWORD key_state, |
| 42 | POINTL cursor_position, |
| 43 | DWORD* effect) { |
| 44 | // Tell the helper that we entered so it can update the drag image. |
| 45 | IDropTargetHelper* drop_helper = DropHelper(); |
| 46 | if (drop_helper) { |
| 47 | drop_helper->DragEnter(GetHWND(), data_object, |
| 48 | reinterpret_cast<POINT*>(&cursor_position), *effect); |
| 49 | } |
| 50 | |
| 51 | // You can't drag and drop within the same HWND. |
| 52 | if (suspend_) { |
| 53 | *effect = DROPEFFECT_NONE; |
| 54 | return S_OK; |
| 55 | } |
| 56 | current_data_object_ = data_object; |
| 57 | POINT screen_pt = { cursor_position.x, cursor_position.y }; |
| 58 | *effect = OnDragEnter(current_data_object_, key_state, screen_pt, *effect); |
| 59 | return S_OK; |
| 60 | } |
| 61 | |
| 62 | HRESULT BaseDropTarget::DragOver(DWORD key_state, |
| 63 | POINTL cursor_position, |
| 64 | DWORD* effect) { |
| 65 | // Tell the helper that we moved over it so it can update the drag image. |
| 66 | IDropTargetHelper* drop_helper = DropHelper(); |
| 67 | if (drop_helper) |
| 68 | drop_helper->DragOver(reinterpret_cast<POINT*>(&cursor_position), *effect); |
| 69 | |
| 70 | if (suspend_) { |
| 71 | *effect = DROPEFFECT_NONE; |
| 72 | return S_OK; |
| 73 | } |
| 74 | |
| 75 | POINT screen_pt = { cursor_position.x, cursor_position.y }; |
| 76 | *effect = OnDragOver(current_data_object_, key_state, screen_pt, *effect); |
| 77 | return S_OK; |
| 78 | } |
| 79 | |
| 80 | HRESULT BaseDropTarget::DragLeave() { |
| 81 | // Tell the helper that we moved out of it so it can update the drag image. |
| 82 | IDropTargetHelper* drop_helper = DropHelper(); |
| 83 | if (drop_helper) |
| 84 | drop_helper->DragLeave(); |
| 85 | |
| 86 | OnDragLeave(current_data_object_); |
| 87 | |
| 88 | current_data_object_ = NULL; |
| 89 | return S_OK; |
| 90 | } |
| 91 | |
| 92 | HRESULT BaseDropTarget::Drop(IDataObject* data_object, |
| 93 | DWORD key_state, |
| 94 | POINTL cursor_position, |
| 95 | DWORD* effect) { |
| 96 | // Tell the helper that we dropped onto it so it can update the drag image. |
| 97 | IDropTargetHelper* drop_helper = DropHelper(); |
| 98 | if (drop_helper) { |
| 99 | drop_helper->Drop(current_data_object_, |
| 100 | reinterpret_cast<POINT*>(&cursor_position), *effect); |
| 101 | } |
| 102 | |
| 103 | if (suspend_) { |
| 104 | *effect = DROPEFFECT_NONE; |
| 105 | return S_OK; |
| 106 | } |
| 107 | |
| 108 | POINT screen_pt = { cursor_position.x, cursor_position.y }; |
| 109 | *effect = OnDrop(current_data_object_, key_state, screen_pt, *effect); |
| 110 | return S_OK; |
| 111 | } |
| 112 | |
| 113 | /////////////////////////////////////////////////////////////////////////////// |
| 114 | // BaseDropTarget, IUnknown implementation: |
| 115 | |
| 116 | HRESULT BaseDropTarget::QueryInterface(const IID& iid, void** object) { |
| 117 | *object = NULL; |
| 118 | if (IsEqualIID(iid, IID_IUnknown) || IsEqualIID(iid, IID_IDropTarget)) { |
| 119 | *object = this; |
| 120 | } else { |
| 121 | return E_NOINTERFACE; |
| 122 | } |
| 123 | AddRef(); |
| 124 | return S_OK; |
| 125 | } |
| 126 | |
| 127 | ULONG BaseDropTarget::AddRef() { |
| 128 | return InterlockedIncrement(&ref_count_); |
| 129 | } |
| 130 | |
| 131 | ULONG BaseDropTarget::Release() { |
| 132 | if (InterlockedDecrement(&ref_count_) == 0) { |
| 133 | ULONG copied_refcnt = ref_count_; |
| 134 | delete this; |
| 135 | return copied_refcnt; |
| 136 | } |
| 137 | return ref_count_; |
| 138 | } |
| 139 | |
| 140 | DWORD BaseDropTarget::OnDragEnter(IDataObject* data_object, |
| 141 | DWORD key_state, |
| 142 | POINT cursor_position, |
| 143 | DWORD effect) { |
| 144 | return DROPEFFECT_NONE; |
| 145 | } |
| 146 | |
| 147 | DWORD BaseDropTarget::OnDragOver(IDataObject* data_object, |
| 148 | DWORD key_state, |
| 149 | POINT cursor_position, |
| 150 | DWORD effect) { |
| 151 | return DROPEFFECT_NONE; |
| 152 | } |
| 153 | |
| 154 | void BaseDropTarget::OnDragLeave(IDataObject* data_object) { |
| 155 | } |
| 156 | |
| 157 | DWORD BaseDropTarget::OnDrop(IDataObject* data_object, |
| 158 | DWORD key_state, |
| 159 | POINT cursor_position, |
| 160 | DWORD effect) { |
| 161 | return DROPEFFECT_NONE; |
| 162 | } |
license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 163 | |