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/*
* vim:ts=8:sw=3:sts=8:noexpandtab:cino=>5n-3f0^-2{2
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "ecore_win32_dnd_drop_target.h"
#include "ecore_win32_private.h"
// structors
DropTarget::DropTarget(HWND window, Ecore_Win32_Dnd_DropTarget_Callback callback, void *window_obj_ptr)
: ref_count_(1)
, window_(window)
, allow_drop_(false)
, drop_callback_(callback)
,drop_callback_ptr_(window_obj_ptr)
{ }
// IUnknown
HRESULT DropTarget::QueryInterface(REFIID iid, void **ppvObject)
{
// check to see what interface has been requested
if (iid == IID_IDropTarget || iid == IID_IUnknown)
{
AddRef();
*ppvObject = this;
return S_OK;
}
*ppvObject = 0;
return E_NOINTERFACE;
}
ULONG DropTarget::AddRef()
{
return InterlockedIncrement(&ref_count_);
}
ULONG DropTarget::Release()
{
LONG count = InterlockedDecrement(&ref_count_);
if (count == 0)
{
delete this;
return 0;
}
return count;
}
// IDropTarget
HRESULT DropTarget::DragEnter(IDataObject *pDataObject, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect)
{
// does the dataobject contain data we want?
allow_drop_ = QueryDataObject(pDataObject) &&
(drop_callback_ == NULL ||
(drop_callback_(drop_callback_ptr_, ECORE_WIN32_DND_EVENT_DRAG_ENTER, pt.x, pt.y, NULL, 0) != 0));
if (allow_drop_)
{
// get the dropeffect based on keyboard state
*pdwEffect = DropEffect(grfKeyState, pt, *pdwEffect);
SetFocus(window_);
//PositionCursor(_hwnd, pt);
}
else
*pdwEffect = DROPEFFECT_NONE;
return S_OK;
}
HRESULT DropTarget::DragOver(DWORD grfKeyState, POINTL pt, DWORD * pdwEffect)
{
allow_drop_ =
(drop_callback_ == NULL) ||
(drop_callback_(drop_callback_ptr_, ECORE_WIN32_DND_EVENT_DRAG_OVER, pt.x, pt.y, NULL, 0) != 0);
if (allow_drop_)
{
*pdwEffect = DropEffect(grfKeyState, pt, *pdwEffect);
//PositionCursor(m_hWnd, pt);
}
else
{
*pdwEffect = DROPEFFECT_NONE;
}
return S_OK;
}
HRESULT DropTarget::DragLeave()
{
POINT pt;
GetCursorPos(&pt);
if (drop_callback_ != NULL)
drop_callback_(drop_callback_ptr_, ECORE_WIN32_DND_EVENT_DRAG_LEAVE, pt.x, pt.y, NULL, 0);
return S_OK;
}
HRESULT DropTarget::Drop(IDataObject *pDataObject, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect)
{
if (allow_drop_)
{
// construct a FORMATETC object
FORMATETC fmtetc = { CF_TEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
STGMEDIUM stgmed;
// See if the dataobject contains any TEXT stored as a HGLOBAL
if (pDataObject->QueryGetData(&fmtetc) == S_OK)
{
// Yippie! the data is there, so go get it!
if (pDataObject->GetData(&fmtetc, &stgmed) == S_OK)
{
// we asked for the data as a HGLOBAL, so access it appropriately
PVOID data = GlobalLock(stgmed.hGlobal);
UINT size = GlobalSize(stgmed.hGlobal);
if (drop_callback_ != NULL)
{
drop_callback_(drop_callback_ptr_,
ECORE_WIN32_DND_EVENT_DROP,
pt.x, pt.y,
data, size);
}
GlobalUnlock(stgmed.hGlobal);
// release the data using the COM API
ReleaseStgMedium(&stgmed);
}
}
*pdwEffect = DropEffect(grfKeyState, pt, *pdwEffect);
}
else
{
*pdwEffect = DROPEFFECT_NONE;
}
return S_OK;
}
// internal helper function
DWORD DropTarget::DropEffect(DWORD grfKeyState, POINTL pt EINA_UNUSED, DWORD dwAllowed)
{
DWORD dwEffect = 0;
// 1. check "pt" -> do we allow a drop at the specified coordinates?
// 2. work out that the drop-effect should be based on grfKeyState
if (grfKeyState & MK_CONTROL)
{
dwEffect = dwAllowed & DROPEFFECT_COPY;
}
else if (grfKeyState & MK_SHIFT)
{
dwEffect = dwAllowed & DROPEFFECT_MOVE;
}
// 3. no key-modifiers were specified (or drop effect not allowed), so
// base the effect on those allowed by the dropsource
if (dwEffect == 0)
{
if (dwAllowed & DROPEFFECT_COPY) dwEffect = DROPEFFECT_COPY;
if (dwAllowed & DROPEFFECT_MOVE) dwEffect = DROPEFFECT_MOVE;
}
return dwEffect;
}
bool DropTarget::QueryDataObject(IDataObject *pDataObject)
{
FORMATETC fmtetc = { CF_TEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
// does the data object support CF_TEXT using a HGLOBAL?
return pDataObject->QueryGetData(&fmtetc) == S_OK;
}
// ecore_win32 private functions
void *_ecore_win32_dnd_register_drop_window(HWND hwnd, Ecore_Win32_Dnd_DropTarget_Callback callback, void *ptr)
{
DropTarget *pDropTarget = new DropTarget(hwnd, callback, ptr);
if (pDropTarget == NULL)
return NULL;
// acquire a strong lock
if (FAILED(CoLockObjectExternal(pDropTarget, TRUE, FALSE)))
{
delete pDropTarget;
return NULL;
}
// tell OLE that the window is a drop target
if (FAILED(RegisterDragDrop(hwnd, pDropTarget)))
{
delete pDropTarget;
return NULL;
}
return pDropTarget;
}
void _ecore_win32_dnd_unregister_drop_window(HWND hwnd, void *drop_target)
{
IDropTarget *pDropTarget = (IDropTarget *)drop_target;
if (drop_target == NULL)
return;
// remove drag+drop
RevokeDragDrop(hwnd);
// remove the strong lock
CoLockObjectExternal(pDropTarget, FALSE, TRUE);
// release our own reference
pDropTarget->Release();
}
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