X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9a83f860948059b0273b5cc6d9e43fadad3ebfca..4a2d030adfa836f6ada1830c9057170d053bcc64:/src/msw/ole/droptgt.cpp diff --git a/src/msw/ole/droptgt.cpp b/src/msw/ole/droptgt.cpp index 4b978f8695..182ae4e3d0 100644 --- a/src/msw/ole/droptgt.cpp +++ b/src/msw/ole/droptgt.cpp @@ -4,7 +4,6 @@ // Author: Vadim Zeitlin // Modified by: // Created: -// RCS-ID: $Id$ // Copyright: (c) 1998 Vadim Zeitlin // Licence: wxWindows licence /////////////////////////////////////////////////////////////////////////////// @@ -50,6 +49,32 @@ #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 +88,7 @@ public: virtual ~wxIDropTarget(); // accessors for wxDropTarget + HWND GetHWND() const { return m_hwnd; } void SetHwnd(HWND hwnd) { m_hwnd = hwnd; } // IDropTarget methods @@ -102,7 +128,7 @@ 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 @@ -192,36 +218,43 @@ STDMETHODIMP wxIDropTarget::DragEnter(IDataObject *pIDataSource, } #endif // 0 - 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(); - // 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. @@ -262,6 +295,10 @@ STDMETHODIMP wxIDropTarget::DragOver(DWORD grfKeyState, *pdwEffect = DROPEFFECT_NONE; } + // update drag image + m_pTarget->MSWUpdateDragImageOnDragOver(pt.x, pt.y, + ConvertDragEffectToResult(*pdwEffect)); + return S_OK; } @@ -279,6 +316,9 @@ STDMETHODIMP wxIDropTarget::DragLeave() // release the held object RELEASE_AND_NULL(m_pIDataObject); + // update drag image + m_pTarget->MSWUpdateDragImageOnLeave(); + return S_OK; } @@ -333,6 +373,10 @@ 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; } @@ -345,7 +389,8 @@ 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. @@ -396,6 +441,8 @@ bool wxDropTarget::Register(WXHWND hwnd) // we will need the window handle for coords transformation later m_pIDropTarget->SetHwnd((HWND)hwnd); + MSWInitDragImageSupport(); + return true; #endif } @@ -417,6 +464,9 @@ void wxDropTarget::Revoke(WXHWND hwnd) ::CoLockObjectExternal(m_pIDropTarget, FALSE, TRUE); #endif + MSWEndDragImageSupport(); + + // remove window reference m_pIDropTarget->SetHwnd(0); #endif } @@ -437,9 +487,6 @@ bool wxDropTarget::GetData() { 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; } @@ -539,6 +586,81 @@ wxDataFormat wxDropTarget::MSWGetSupportedFormat(IDataObject *pIDataSource) cons 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 // ----------------------------------------------------------------------------