X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ffdbfc4a7647556f83b9534a1faad71136fcff2a..a02b2a9d31b9ebc9cb13e0ea744169bc355e2ea0:/src/msw/ole/droptgt.cpp?ds=sidebyside diff --git a/src/msw/ole/droptgt.cpp b/src/msw/ole/droptgt.cpp index be6d4fcdfb..e63e55038e 100644 --- a/src/msw/ole/droptgt.cpp +++ b/src/msw/ole/droptgt.cpp @@ -80,9 +80,9 @@ protected: HWND m_hwnd; // window we're associated with // get default drop effect for given keyboard flags - static DWORD GetDropEffect(DWORD flags, wxDragResult defaultAction); + static DWORD GetDropEffect(DWORD flags, wxDragResult defaultAction, DWORD pdwEffect); - DECLARE_NO_COPY_CLASS(wxIDropTarget) + wxDECLARE_NO_COPY_CLASS(wxIDropTarget); }; // ---------------------------------------------------------------------------- @@ -99,16 +99,39 @@ static DWORD ConvertDragResultToEffect(wxDragResult result); // Name : static wxIDropTarget::GetDropEffect // Purpose : determine the drop operation from keyboard/mouse state. // Returns : DWORD combined from DROPEFFECT_xxx constants -// Params : [in] DWORD flags kbd & mouse flags as passed to -// IDropTarget methods +// Params : [in] DWORD flags kbd & mouse flags as passed to +// IDropTarget methods +// [in] wxDragResult defaultAction the default action of the drop target +// [in] DWORD pdwEffect the supported actions of the drop +// source passed to IDropTarget methods // Notes : We do "move" normally and "copy" if is pressed, // which is the standard behaviour (currently there is no // way to redefine it) -DWORD wxIDropTarget::GetDropEffect(DWORD flags, wxDragResult defaultAction) +DWORD wxIDropTarget::GetDropEffect(DWORD flags, + wxDragResult defaultAction, + DWORD pdwEffect) { - if (defaultAction == wxDragCopy) - return flags & MK_SHIFT ? DROPEFFECT_MOVE : DROPEFFECT_COPY; - return flags & MK_CONTROL ? DROPEFFECT_COPY : DROPEFFECT_MOVE; + DWORD effectiveAction; + if ( defaultAction == wxDragCopy ) + effectiveAction = flags & MK_SHIFT ? DROPEFFECT_MOVE : DROPEFFECT_COPY; + else + effectiveAction = flags & MK_CONTROL ? DROPEFFECT_COPY : DROPEFFECT_MOVE; + + if ( !(effectiveAction & pdwEffect) ) + { + // the action is not supported by drag source, fall back to something + // that it does support + if ( pdwEffect & DROPEFFECT_MOVE ) + effectiveAction = DROPEFFECT_MOVE; + else if ( pdwEffect & DROPEFFECT_COPY ) + effectiveAction = DROPEFFECT_COPY; + else if ( pdwEffect & DROPEFFECT_LINK ) + effectiveAction = DROPEFFECT_LINK; + else + effectiveAction = DROPEFFECT_NONE; + } + + return effectiveAction; } wxIDropTarget::wxIDropTarget(wxDropTarget *pTarget) @@ -131,10 +154,12 @@ IMPLEMENT_IUNKNOWN_METHODS(wxIDropTarget) // Name : wxIDropTarget::DragEnter // Purpose : Called when the mouse enters the window (dragging something) // Returns : S_OK -// Params : [in] IDataObject *pIDataSource : source data -// [in] DWORD grfKeyState : kbd & mouse state -// [in] POINTL pt : mouse coordinates -// [out]DWORD *pdwEffect : effect flag +// Params : [in] IDataObject *pIDataSource : source data +// [in] DWORD grfKeyState : kbd & mouse state +// [in] POINTL pt : mouse coordinates +// [in/out]DWORD *pdwEffect : effect flag +// In: Supported effects +// Out: Resulting effect // Notes : STDMETHODIMP wxIDropTarget::DragEnter(IDataObject *pIDataSource, DWORD grfKeyState, @@ -144,7 +169,7 @@ STDMETHODIMP wxIDropTarget::DragEnter(IDataObject *pIDataSource, wxLogTrace(wxTRACE_OleCalls, wxT("IDropTarget::DragEnter")); wxASSERT_MSG( m_pIDataObject == NULL, - _T("drop target must have data object") ); + wxT("drop target must have data object") ); // show the list of formats supported by the source data object for the // debugging purposes, this is quite useful sometimes - please don't remove @@ -155,7 +180,7 @@ STDMETHODIMP wxIDropTarget::DragEnter(IDataObject *pIDataSource, FORMATETC fmt; while ( penumFmt->Next(1, &fmt, NULL) == S_OK ) { - wxLogDebug(_T("Drop source supports format %s"), + wxLogDebug(wxT("Drop source supports format %s"), wxDataObject::GetFormatName(fmt.cfFormat)); } @@ -163,17 +188,20 @@ STDMETHODIMP wxIDropTarget::DragEnter(IDataObject *pIDataSource, } else { - wxLogLastError(_T("IDataObject::EnumFormatEtc")); + wxLogLastError(wxT("IDataObject::EnumFormatEtc")); } #endif // 0 - if ( !m_pTarget->IsAcceptedData(pIDataSource) ) { + if ( !m_pTarget->MSWIsAcceptedData(pIDataSource) ) { // we don't accept this kind of data *pdwEffect = DROPEFFECT_NONE; return S_OK; } + // for use in OnEnter and OnDrag calls + m_pTarget->MSWSetDataSource(pIDataSource); + // get hold of the data object m_pIDataObject = pIDataSource; m_pIDataObject->AddRef(); @@ -187,7 +215,7 @@ STDMETHODIMP wxIDropTarget::DragEnter(IDataObject *pIDataSource, // give some visual feedback *pdwEffect = ConvertDragResultToEffect( m_pTarget->OnEnter(pt.x, pt.y, ConvertDragEffectToResult( - GetDropEffect(grfKeyState, m_pTarget->GetDefaultAction())) + GetDropEffect(grfKeyState, m_pTarget->GetDefaultAction(), *pdwEffect)) ) ); @@ -198,9 +226,9 @@ STDMETHODIMP wxIDropTarget::DragEnter(IDataObject *pIDataSource, // Purpose : Indicates that the mouse was moved inside the window represented // by this drop target. // Returns : S_OK -// Params : [in] DWORD grfKeyState kbd & mouse state -// [in] POINTL pt mouse coordinates -// [out]LPDWORD pdwEffect effect flag +// Params : [in] DWORD grfKeyState kbd & mouse state +// [in] POINTL pt mouse coordinates +// [in/out]LPDWORD pdwEffect current effect flag // Notes : We're called on every WM_MOUSEMOVE, so this function should be // very efficient. STDMETHODIMP wxIDropTarget::DragOver(DWORD grfKeyState, @@ -212,22 +240,27 @@ STDMETHODIMP wxIDropTarget::DragOver(DWORD grfKeyState, wxDragResult result; if ( m_pIDataObject ) { result = ConvertDragEffectToResult( - GetDropEffect(grfKeyState, m_pTarget->GetDefaultAction())); + GetDropEffect(grfKeyState, m_pTarget->GetDefaultAction(), *pdwEffect)); } else { // can't accept data anyhow normally result = wxDragNone; } - // we need client coordinates to pass to wxWin functions - if ( !ScreenToClient(m_hwnd, (POINT *)&pt) ) - { - wxLogLastError(wxT("ScreenToClient")); - } + if ( result != wxDragNone ) { + // we need client coordinates to pass to wxWin functions + if ( !ScreenToClient(m_hwnd, (POINT *)&pt) ) + { + wxLogLastError(wxT("ScreenToClient")); + } - *pdwEffect = ConvertDragResultToEffect( - m_pTarget->OnDragOver(pt.x, pt.y, result) - ); + *pdwEffect = ConvertDragResultToEffect( + m_pTarget->OnDragOver(pt.x, pt.y, result) + ); + } + else { + *pdwEffect = DROPEFFECT_NONE; + } return S_OK; } @@ -253,10 +286,10 @@ STDMETHODIMP wxIDropTarget::DragLeave() // Purpose : Instructs the drop target to paste data that was just now // dropped on it. // Returns : S_OK -// Params : [in] IDataObject *pIDataSource the data to paste -// [in] DWORD grfKeyState kbd & mouse state -// [in] POINTL pt where the drop occurred? -// [ouy]DWORD *pdwEffect operation effect +// Params : [in] IDataObject *pIDataSource the data to paste +// [in] DWORD grfKeyState kbd & mouse state +// [in] POINTL pt where the drop occurred? +// [in/out]DWORD *pdwEffect operation effect // Notes : STDMETHODIMP wxIDropTarget::Drop(IDataObject *pIDataSource, DWORD grfKeyState, @@ -269,9 +302,6 @@ STDMETHODIMP wxIDropTarget::Drop(IDataObject *pIDataSource, // that it's the same we've already got in DragEnter wxASSERT( m_pIDataObject == pIDataSource ); - // by default, nothing happens - *pdwEffect = DROPEFFECT_NONE; - // we need client coordinates to pass to wxWin functions if ( !ScreenToClient(m_hwnd, (POINT *)&pt) ) { @@ -281,19 +311,24 @@ STDMETHODIMP wxIDropTarget::Drop(IDataObject *pIDataSource, // first ask the drop target if it wants data if ( m_pTarget->OnDrop(pt.x, pt.y) ) { // it does, so give it the data source - m_pTarget->SetDataSource(pIDataSource); + m_pTarget->MSWSetDataSource(pIDataSource); // and now it has the data wxDragResult rc = ConvertDragEffectToResult( - GetDropEffect(grfKeyState, m_pTarget->GetDefaultAction())); + GetDropEffect(grfKeyState, m_pTarget->GetDefaultAction(), *pdwEffect)); rc = m_pTarget->OnData(pt.x, pt.y, rc); if ( wxIsDragResultOk(rc) ) { // operation succeeded *pdwEffect = ConvertDragResultToEffect(rc); } - //else: *pdwEffect is already DROPEFFECT_NONE + else { + *pdwEffect = DROPEFFECT_NONE; + } + } + else { + // OnDrop() returned false, no need to copy data + *pdwEffect = DROPEFFECT_NONE; } - //else: OnDrop() returned false, no need to copy data // release the held object RELEASE_AND_NULL(m_pIDataObject); @@ -400,7 +435,7 @@ bool wxDropTarget::OnDrop(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y)) // copy the data from the data source to the target data object bool wxDropTarget::GetData() { - wxDataFormat format = GetSupportedFormat(m_pIDataSource); + wxDataFormat format = MSWGetSupportedFormat(m_pIDataSource); if ( format == wxDF_INVALID ) { // this is strange because IsAcceptedData() succeeded previously! wxFAIL_MSG(wxT("strange - did supported formats list change?")); @@ -442,22 +477,27 @@ bool wxDropTarget::GetData() // ---------------------------------------------------------------------------- // we need a data source, so wxIDropTarget gives it to us using this function -void wxDropTarget::SetDataSource(IDataObject *pIDataSource) +void wxDropTarget::MSWSetDataSource(IDataObject *pIDataSource) { m_pIDataSource = pIDataSource; } // determine if we accept data of this type -bool wxDropTarget::IsAcceptedData(IDataObject *pIDataSource) const +bool wxDropTarget::MSWIsAcceptedData(IDataObject *pIDataSource) const { - return GetSupportedFormat(pIDataSource) != wxDF_INVALID; + return MSWGetSupportedFormat(pIDataSource) != wxDF_INVALID; } // ---------------------------------------------------------------------------- // helper functions // ---------------------------------------------------------------------------- -wxDataFormat wxDropTarget::GetSupportedFormat(IDataObject *pIDataSource) const +wxDataFormat wxDropTarget::GetMatchingPair() +{ + return MSWGetSupportedFormat( m_pIDataSource ); +} + +wxDataFormat wxDropTarget::MSWGetSupportedFormat(IDataObject *pIDataSource) const { // this strucutre describes a data of any type (first field will be // changing) being passed through global memory block.