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honour the drag effect supported by the drag source in wxIDropTarget (Tim Kosse)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44229 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2007-01-15 19:02:29 +00:00
parent 4d1f840337
commit c25db58432
1 changed files with 35 additions and 13 deletions
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48
src/msw/ole/droptgt.cpp
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@ -80,7 +80,7 @@ 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)
};
@ -104,11 +104,31 @@ static DWORD ConvertDragResultToEffect(wxDragResult result);
// Notes : We do "move" normally and "copy" if <Ctrl> 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)
@ -187,7 +207,7 @@ 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))
)
);
@ -212,7 +232,7 @@ 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
@ -269,9 +289,6 @@ 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) )
{
@ -285,15 +302,20 @@ 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);