X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/08291defc22aaa6bdfb16fa5c45f4da0ed420a12..bb996f289574defb0ae4339ae8e46ff3cf6fa54c:/src/msw/ole/droptgt.cpp diff --git a/src/msw/ole/droptgt.cpp b/src/msw/ole/droptgt.cpp index 4601d19be4..4f0b716dde 100644 --- a/src/msw/ole/droptgt.cpp +++ b/src/msw/ole/droptgt.cpp @@ -50,6 +50,32 @@ #include "wx/msw/ole/oleutils.h" +#include + +// Some (very) old SDKs don't define IDropTargetHelper, so define our own +// version of it here. +struct wxIDropTargetHelper : public IUnknown +{ + virtual HRESULT STDMETHODCALLTYPE DragEnter(HWND hwndTarget, + IDataObject *pDataObject, + POINT *ppt, + DWORD dwEffect) = 0; + virtual HRESULT STDMETHODCALLTYPE DragLeave() = 0; + virtual HRESULT STDMETHODCALLTYPE DragOver(POINT *ppt, DWORD dwEffect) = 0; + virtual HRESULT STDMETHODCALLTYPE Drop(IDataObject *pDataObject, + POINT *ppt, + DWORD dwEffect) = 0; + virtual HRESULT STDMETHODCALLTYPE Show(BOOL fShow) = 0; +}; + +namespace +{ + DEFINE_GUID(wxCLSID_DragDropHelper, + 0x4657278A,0x411B,0x11D2,0x83,0x9A,0x00,0xC0,0x4F,0xD9,0x18,0xD0); + DEFINE_GUID(wxIID_IDropTargetHelper, + 0x4657278B,0x411B,0x11D2,0x83,0x9A,0x00,0xC0,0x4F,0xD9,0x18,0xD0); +} + // ---------------------------------------------------------------------------- // IDropTarget interface: forward all interesting things to wxDropTarget // (the name is unfortunate, but wx_I_DropTarget is not at all the same thing @@ -63,6 +89,7 @@ public: virtual ~wxIDropTarget(); // accessors for wxDropTarget + HWND GetHWND() const { return m_hwnd; } void SetHwnd(HWND hwnd) { m_hwnd = hwnd; } // IDropTarget methods @@ -82,7 +109,7 @@ protected: // get default drop effect for given keyboard flags static DWORD GetDropEffect(DWORD flags, wxDragResult defaultAction, DWORD pdwEffect); - DECLARE_NO_COPY_CLASS(wxIDropTarget) + wxDECLARE_NO_COPY_CLASS(wxIDropTarget); }; // ---------------------------------------------------------------------------- @@ -102,7 +129,7 @@ static DWORD ConvertDragResultToEffect(wxDragResult result); // 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 +// [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 @@ -169,7 +196,7 @@ 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 @@ -180,7 +207,7 @@ 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)); } @@ -188,37 +215,47 @@ STDMETHODIMP wxIDropTarget::DragEnter(IDataObject *pIDataSource, } else { - wxLogLastError(_T("IDataObject::EnumFormatEtc")); + wxLogLastError(wxT("IDataObject::EnumFormatEtc")); } #endif // 0 - if ( !m_pTarget->IsAcceptedData(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(); - // we need client coordinates to pass to wxWin functions - if ( !ScreenToClient(m_hwnd, (POINT *)&pt) ) + if ( !m_pTarget->MSWIsAcceptedData(pIDataSource) ) { + // we don't accept this kind of data + *pdwEffect = DROPEFFECT_NONE; + } + else { - wxLogLastError(wxT("ScreenToClient")); + // we need client coordinates to pass to wxWin functions + if ( !ScreenToClient(m_hwnd, (POINT *)&pt) ) + { + wxLogLastError(wxT("ScreenToClient")); + } + + // give some visual feedback + *pdwEffect = ConvertDragResultToEffect( + m_pTarget->OnEnter(pt.x, pt.y, ConvertDragEffectToResult( + GetDropEffect(grfKeyState, m_pTarget->GetDefaultAction(), *pdwEffect)) + ) + ); } - // give some visual feedback - *pdwEffect = ConvertDragResultToEffect( - m_pTarget->OnEnter(pt.x, pt.y, ConvertDragEffectToResult( - GetDropEffect(grfKeyState, m_pTarget->GetDefaultAction(), *pdwEffect)) - ) - ); + // update drag image + const wxDragResult res = ConvertDragEffectToResult(*pdwEffect); + m_pTarget->MSWUpdateDragImageOnEnter(pt.x, pt.y, res); + m_pTarget->MSWUpdateDragImageOnDragOver(pt.x, pt.y, res); return S_OK; } + + // Name : wxIDropTarget::DragOver // Purpose : Indicates that the mouse was moved inside the window represented // by this drop target. @@ -244,15 +281,24 @@ STDMETHODIMP wxIDropTarget::DragOver(DWORD grfKeyState, 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) + ); + } + else { + *pdwEffect = DROPEFFECT_NONE; } - *pdwEffect = ConvertDragResultToEffect( - m_pTarget->OnDragOver(pt.x, pt.y, result) - ); + // update drag image + m_pTarget->MSWUpdateDragImageOnDragOver(pt.x, pt.y, + ConvertDragEffectToResult(*pdwEffect)); return S_OK; } @@ -271,6 +317,9 @@ STDMETHODIMP wxIDropTarget::DragLeave() // release the held object RELEASE_AND_NULL(m_pIDataObject); + // update drag image + m_pTarget->MSWUpdateDragImageOnLeave(); + return S_OK; } @@ -303,7 +352,7 @@ 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( @@ -325,6 +374,10 @@ STDMETHODIMP wxIDropTarget::Drop(IDataObject *pIDataSource, // release the held object RELEASE_AND_NULL(m_pIDataObject); + // update drag image + m_pTarget->MSWUpdateDragImageOnData(pt.x, pt.y, + ConvertDragEffectToResult(*pdwEffect)); + return S_OK; } @@ -337,7 +390,8 @@ STDMETHODIMP wxIDropTarget::Drop(IDataObject *pIDataSource, // ---------------------------------------------------------------------------- wxDropTarget::wxDropTarget(wxDataObject *dataObj) - : wxDropTargetBase(dataObj) + : wxDropTargetBase(dataObj), + m_dropTargetHelper(NULL) { // create an IDropTarget implementation which will notify us about d&d // operations. @@ -388,6 +442,8 @@ bool wxDropTarget::Register(WXHWND hwnd) // we will need the window handle for coords transformation later m_pIDropTarget->SetHwnd((HWND)hwnd); + MSWInitDragImageSupport(); + return true; #endif } @@ -409,6 +465,9 @@ void wxDropTarget::Revoke(WXHWND hwnd) ::CoLockObjectExternal(m_pIDropTarget, FALSE, TRUE); #endif + MSWEndDragImageSupport(); + + // remove window reference m_pIDropTarget->SetHwnd(0); #endif } @@ -427,11 +486,8 @@ 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?")); - return false; } @@ -469,22 +525,27 @@ 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. @@ -526,6 +587,81 @@ wxDataFormat wxDropTarget::GetSupportedFormat(IDataObject *pIDataSource) const return n < nFormats ? format : wxFormatInvalid; } +// ---------------------------------------------------------------------------- +// drag image functions +// ---------------------------------------------------------------------------- + +void +wxDropTarget::MSWEndDragImageSupport() +{ + // release drop target helper + if ( m_dropTargetHelper != NULL ) + { + m_dropTargetHelper->Release(); + m_dropTargetHelper = NULL; + } +} + +void +wxDropTarget::MSWInitDragImageSupport() +{ + // Use the default drop target helper to show shell drag images + CoCreateInstance(wxCLSID_DragDropHelper, NULL, CLSCTX_INPROC_SERVER, + wxIID_IDropTargetHelper, (LPVOID*)&m_dropTargetHelper); +} + +void +wxDropTarget::MSWUpdateDragImageOnData(wxCoord x, + wxCoord y, + wxDragResult dragResult) +{ + // call corresponding event on drop target helper + if ( m_dropTargetHelper != NULL ) + { + POINT pt = {x, y}; + DWORD dwEffect = ConvertDragResultToEffect(dragResult); + m_dropTargetHelper->Drop(m_pIDataSource, &pt, dwEffect); + } +} + +void +wxDropTarget::MSWUpdateDragImageOnDragOver(wxCoord x, + wxCoord y, + wxDragResult dragResult) +{ + // call corresponding event on drop target helper + if ( m_dropTargetHelper != NULL ) + { + POINT pt = {x, y}; + DWORD dwEffect = ConvertDragResultToEffect(dragResult); + m_dropTargetHelper->DragOver(&pt, dwEffect); + } +} + +void +wxDropTarget::MSWUpdateDragImageOnEnter(wxCoord x, + wxCoord y, + wxDragResult dragResult) +{ + // call corresponding event on drop target helper + if ( m_dropTargetHelper != NULL ) + { + POINT pt = {x, y}; + DWORD dwEffect = ConvertDragResultToEffect(dragResult); + m_dropTargetHelper->DragEnter(m_pIDropTarget->GetHWND(), m_pIDataSource, &pt, dwEffect); + } +} + +void +wxDropTarget::MSWUpdateDragImageOnLeave() +{ + // call corresponding event on drop target helper + if ( m_dropTargetHelper != NULL ) + { + m_dropTargetHelper->DragLeave(); + } +} + // ---------------------------------------------------------------------------- // private functions // ----------------------------------------------------------------------------