| 1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/msw/ole/dropsrc.cpp |
| 3 | // Purpose: implementation of wxIDropSource and wxDropSource |
| 4 | // Author: Vadim Zeitlin |
| 5 | // Modified by: |
| 6 | // Created: 10.05.98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr> |
| 9 | // Licence: wxWindows licence |
| 10 | /////////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | // ============================================================================ |
| 13 | // declarations |
| 14 | // ============================================================================ |
| 15 | |
| 16 | // ---------------------------------------------------------------------------- |
| 17 | // headers |
| 18 | // ---------------------------------------------------------------------------- |
| 19 | |
| 20 | // For compilers that support precompilation, includes "wx.h". |
| 21 | #include "wx/wxprec.h" |
| 22 | |
| 23 | #if defined(__BORLANDC__) |
| 24 | #pragma hdrstop |
| 25 | #endif |
| 26 | |
| 27 | #ifndef WX_PRECOMP |
| 28 | #include "wx/window.h" |
| 29 | #endif |
| 30 | |
| 31 | #if wxUSE_OLE && wxUSE_DRAG_AND_DROP |
| 32 | |
| 33 | #include "wx/log.h" |
| 34 | #include "wx/dnd.h" |
| 35 | |
| 36 | #include "wx/msw/private.h" |
| 37 | |
| 38 | // for some compilers, the entire ole2.h must be included, not only oleauto.h |
| 39 | #if wxUSE_NORLANDER_HEADERS || defined(__WATCOMC__) || defined(__WXWINCE__) |
| 40 | #include <ole2.h> |
| 41 | #endif |
| 42 | |
| 43 | #include <oleauto.h> |
| 44 | |
| 45 | #include "wx/msw/ole/oleutils.h" |
| 46 | |
| 47 | // ---------------------------------------------------------------------------- |
| 48 | // wxIDropSource implementation of IDropSource interface |
| 49 | // ---------------------------------------------------------------------------- |
| 50 | |
| 51 | class wxIDropSource : public IDropSource |
| 52 | { |
| 53 | public: |
| 54 | wxIDropSource(wxDropSource *pDropSource); |
| 55 | virtual ~wxIDropSource() { } |
| 56 | |
| 57 | // IDropSource |
| 58 | STDMETHODIMP QueryContinueDrag(BOOL fEscapePressed, DWORD grfKeyState); |
| 59 | STDMETHODIMP GiveFeedback(DWORD dwEffect); |
| 60 | |
| 61 | DECLARE_IUNKNOWN_METHODS; |
| 62 | |
| 63 | private: |
| 64 | DWORD m_grfInitKeyState; // button which started the d&d operation |
| 65 | wxDropSource *m_pDropSource; // pointer to C++ class we belong to |
| 66 | |
| 67 | DECLARE_NO_COPY_CLASS(wxIDropSource) |
| 68 | }; |
| 69 | |
| 70 | // ============================================================================ |
| 71 | // Implementation |
| 72 | // ============================================================================ |
| 73 | |
| 74 | // ---------------------------------------------------------------------------- |
| 75 | // wxIDropSource implementation |
| 76 | // ---------------------------------------------------------------------------- |
| 77 | BEGIN_IID_TABLE(wxIDropSource) |
| 78 | ADD_IID(Unknown) |
| 79 | ADD_IID(DropSource) |
| 80 | END_IID_TABLE; |
| 81 | |
| 82 | IMPLEMENT_IUNKNOWN_METHODS(wxIDropSource) |
| 83 | |
| 84 | wxIDropSource::wxIDropSource(wxDropSource *pDropSource) |
| 85 | { |
| 86 | wxASSERT( pDropSource != NULL ); |
| 87 | |
| 88 | m_pDropSource = pDropSource; |
| 89 | m_grfInitKeyState = 0; |
| 90 | } |
| 91 | |
| 92 | // Name : wxIDropSource::QueryContinueDrag |
| 93 | // Purpose : decide if drag operation must be continued or not |
| 94 | // Returns : HRESULT: S_OK if we should continue |
| 95 | // DRAGDROP_S_DROP to drop right now |
| 96 | // DRAGDROP_S_CANCEL to cancel everything |
| 97 | // Params : [in] BOOL fEscapePressed <Esc> pressed since last call? |
| 98 | // [in] DWORD grfKeyState mask containing state of kbd keys |
| 99 | // Notes : as there is no reasonably simple portable way to implement this |
| 100 | // function, we currently don't give the possibility to override the |
| 101 | // default behaviour implemented here |
| 102 | STDMETHODIMP wxIDropSource::QueryContinueDrag(BOOL fEscapePressed, |
| 103 | DWORD grfKeyState) |
| 104 | { |
| 105 | if ( fEscapePressed ) |
| 106 | return DRAGDROP_S_CANCEL; |
| 107 | |
| 108 | // initialize ourself with the drag begin button |
| 109 | if ( m_grfInitKeyState == 0 ) { |
| 110 | m_grfInitKeyState = grfKeyState & (MK_LBUTTON | MK_RBUTTON | MK_MBUTTON); |
| 111 | } |
| 112 | |
| 113 | if ( !(grfKeyState & m_grfInitKeyState) ) { |
| 114 | // button which started d&d released, go! |
| 115 | return DRAGDROP_S_DROP; |
| 116 | } |
| 117 | |
| 118 | return S_OK; |
| 119 | } |
| 120 | |
| 121 | // Name : wxIDropSource::GiveFeedback |
| 122 | // Purpose : give UI feedback according to current state of operation |
| 123 | // Returns : STDMETHODIMP |
| 124 | // Params : [in] DWORD dwEffect - what would happen if we dropped now |
| 125 | // Notes : default implementation is ok in more than 99% of cases |
| 126 | STDMETHODIMP wxIDropSource::GiveFeedback(DWORD dwEffect) |
| 127 | { |
| 128 | wxDragResult effect; |
| 129 | if ( dwEffect & DROPEFFECT_COPY ) |
| 130 | effect = wxDragCopy; |
| 131 | else if ( dwEffect & DROPEFFECT_MOVE ) |
| 132 | effect = wxDragMove; |
| 133 | else |
| 134 | effect = wxDragNone; |
| 135 | |
| 136 | if ( m_pDropSource->GiveFeedback(effect) ) |
| 137 | return S_OK; |
| 138 | |
| 139 | return DRAGDROP_S_USEDEFAULTCURSORS; |
| 140 | } |
| 141 | |
| 142 | // ---------------------------------------------------------------------------- |
| 143 | // wxDropSource implementation |
| 144 | // ---------------------------------------------------------------------------- |
| 145 | |
| 146 | // ctors |
| 147 | |
| 148 | // common part of all ctors |
| 149 | void wxDropSource::Init() |
| 150 | { |
| 151 | m_pIDropSource = new wxIDropSource(this); |
| 152 | m_pIDropSource->AddRef(); |
| 153 | } |
| 154 | |
| 155 | wxDropSource::wxDropSource(wxWindow* WXUNUSED(win), |
| 156 | const wxCursor &cursorCopy, |
| 157 | const wxCursor &cursorMove, |
| 158 | const wxCursor &cursorStop) |
| 159 | : wxDropSourceBase(cursorCopy, cursorMove, cursorStop) |
| 160 | { |
| 161 | Init(); |
| 162 | } |
| 163 | |
| 164 | wxDropSource::wxDropSource(wxDataObject& data, |
| 165 | wxWindow* WXUNUSED(win), |
| 166 | const wxCursor &cursorCopy, |
| 167 | const wxCursor &cursorMove, |
| 168 | const wxCursor &cursorStop) |
| 169 | : wxDropSourceBase(cursorCopy, cursorMove, cursorStop) |
| 170 | { |
| 171 | Init(); |
| 172 | SetData(data); |
| 173 | } |
| 174 | |
| 175 | wxDropSource::~wxDropSource() |
| 176 | { |
| 177 | m_pIDropSource->Release(); |
| 178 | } |
| 179 | |
| 180 | // Name : DoDragDrop |
| 181 | // Purpose : start drag and drop operation |
| 182 | // Returns : wxDragResult - the code of performed operation |
| 183 | // Params : [in] int flags: specifies if moving is allowe (or only copying) |
| 184 | // Notes : you must call SetData() before if you had used def ctor |
| 185 | wxDragResult wxDropSource::DoDragDrop(int flags) |
| 186 | { |
| 187 | wxCHECK_MSG( m_data != NULL, wxDragNone, wxT("No data in wxDropSource!") ); |
| 188 | |
| 189 | DWORD dwEffect; |
| 190 | HRESULT hr = ::DoDragDrop(m_data->GetInterface(), |
| 191 | m_pIDropSource, |
| 192 | (flags & wxDrag_AllowMove) |
| 193 | ? DROPEFFECT_COPY | DROPEFFECT_MOVE |
| 194 | : DROPEFFECT_COPY, |
| 195 | &dwEffect); |
| 196 | |
| 197 | if ( hr == DRAGDROP_S_CANCEL ) { |
| 198 | return wxDragCancel; |
| 199 | } |
| 200 | else if ( hr == DRAGDROP_S_DROP ) { |
| 201 | if ( dwEffect & DROPEFFECT_COPY ) { |
| 202 | return wxDragCopy; |
| 203 | } |
| 204 | else if ( dwEffect & DROPEFFECT_MOVE ) { |
| 205 | // consistency check: normally, we shouldn't get "move" at all |
| 206 | // here if we don't allow it, but in practice it does happen quite often |
| 207 | return (flags & wxDrag_AllowMove) ? wxDragMove : wxDragCopy; |
| 208 | } |
| 209 | else { |
| 210 | // not copy or move |
| 211 | return wxDragNone; |
| 212 | } |
| 213 | } |
| 214 | else { |
| 215 | if ( FAILED(hr) ) { |
| 216 | wxLogApiError(wxT("DoDragDrop"), hr); |
| 217 | wxLogError(wxT("Drag & drop operation failed.")); |
| 218 | } |
| 219 | else { |
| 220 | wxLogDebug(wxT("Unexpected success return code %08lx from DoDragDrop."), |
| 221 | hr); |
| 222 | } |
| 223 | |
| 224 | return wxDragError; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | // Name : wxDropSource::GiveFeedback |
| 229 | // Purpose : visually inform the user about d&d operation state |
| 230 | // Returns : bool: true if we do all ourselves or false for default feedback |
| 231 | // Params : [in] DragResult effect - what would happen if we dropped now |
| 232 | // Notes : here we just leave this stuff for default implementation |
| 233 | bool wxDropSource::GiveFeedback(wxDragResult effect) |
| 234 | { |
| 235 | const wxCursor& cursor = GetCursor(effect); |
| 236 | if ( cursor.Ok() ) |
| 237 | { |
| 238 | ::SetCursor((HCURSOR)cursor.GetHCURSOR()); |
| 239 | |
| 240 | return true; |
| 241 | } |
| 242 | else |
| 243 | { |
| 244 | return false; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | #endif //USE_DRAG_AND_DROP |