X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e4db172a3b318df9aff178eb6c5da149d56e0859..508b6523350b4b1c4b2518b6c8c69e5d161f26c5:/src/msw/ole/droptgt.cpp diff --git a/src/msw/ole/droptgt.cpp b/src/msw/ole/droptgt.cpp index 1301f08d47..4601d19be4 100644 --- a/src/msw/ole/droptgt.cpp +++ b/src/msw/ole/droptgt.cpp @@ -27,6 +27,7 @@ #if wxUSE_OLE && wxUSE_DRAG_AND_DROP #ifndef WX_PRECOMP + #include "wx/msw/wrapwin.h" #include "wx/log.h" #endif @@ -39,9 +40,6 @@ #ifdef __WIN32__ #if !defined(__GNUWIN32__) || wxUSE_NORLANDER_HEADERS - #if wxCHECK_W32API_VERSION( 1, 0 ) - #include "wx/msw/wrapwin.h" - #endif #include // for DROPFILES structure #endif #else @@ -82,7 +80,7 @@ protected: HWND m_hwnd; // window we're associated with // get default drop effect for given keyboard flags - static inline DWORD GetDropEffect(DWORD flags, wxDragResult defaultAction); + static DWORD GetDropEffect(DWORD flags, wxDragResult defaultAction, DWORD pdwEffect); DECLARE_NO_COPY_CLASS(wxIDropTarget) }; @@ -101,16 +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) @@ -133,10 +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, @@ -189,7 +212,7 @@ 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)) ) ); @@ -200,9 +223,9 @@ 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, @@ -214,7 +237,7 @@ 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 @@ -255,10 +278,10 @@ 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, @@ -271,9 +294,6 @@ 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) ) { @@ -287,15 +307,20 @@ STDMETHODIMP wxIDropTarget::Drop(IDataObject *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);