112 lines
4.3 KiB
C
112 lines
4.3 KiB
C
|
#ifndef _DROPTGT_H_
|
||
|
|
#define _DROPTGT_H_
|
||
|
|
|
||
|
|
// There are two drag-drop support objects:
|
||
|
|
//
|
||
|
|
// CDropTargetWrap - This object takes a collection of drop-target
|
||
|
|
// objects and wraps them as one drop-target
|
||
|
|
// handler. The first drop-target wins over the
|
||
|
|
// the last one if there is a conflict in who
|
||
|
|
// will take the drop.
|
||
|
|
//
|
||
|
|
// CDelegateDropTarget - This class implements IDropTarget given an
|
||
|
|
// IDelegateDropTargetCB interface. It handles
|
||
|
|
// all hit testing, caching, and scrolling for you.
|
||
|
|
// Use this class by inheriting it in your derived
|
||
|
|
// class; it is not intended to be instantiated alone.
|
||
|
|
//
|
||
|
|
|
||
|
|
// Event notifications for HitTestDDT
|
||
|
|
#define HTDDT_ENTER 0
|
||
|
|
#define HTDDT_OVER 1
|
||
|
|
#define HTDDT_LEAVE 2
|
||
|
|
|
||
|
|
class CDelegateDropTarget : public IDropTarget
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
// *** IDropTarget methods ***
|
||
|
|
virtual STDMETHODIMP DragEnter(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
|
||
|
|
virtual STDMETHODIMP DragOver(DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
|
||
|
|
virtual STDMETHODIMP DragLeave(void);
|
||
|
|
virtual STDMETHODIMP Drop(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
|
||
|
|
|
||
|
|
// *** Other methods to be implemented by derived class ***
|
||
|
|
|
||
|
|
virtual HRESULT GetWindowsDDT (HWND * phwndLock, HWND * phwndScroll) PURE;
|
||
|
|
virtual HRESULT HitTestDDT (UINT nEvent, LPPOINT ppt, DWORD_PTR * pdwId, DWORD *pdwEffect) PURE;
|
||
|
|
virtual HRESULT GetObjectDDT (DWORD_PTR dwId, REFIID riid, LPVOID * ppvObj) PURE;
|
||
|
|
virtual HRESULT OnDropDDT (IDropTarget *pdt, IDataObject *pdtobj,
|
||
|
|
DWORD * pgrfKeyState, POINTL pt, DWORD *pdwEffect) PURE;
|
||
|
|
|
||
|
|
friend IDropTarget* DropTargetWrap_CreateInstance(IDropTarget* pdtPrimary,
|
||
|
|
IDropTarget* pdtSecondary,
|
||
|
|
HWND hwnd, IDropTarget* pdt3 = NULL);
|
||
|
|
protected:
|
||
|
|
CDelegateDropTarget();
|
||
|
|
virtual ~CDelegateDropTarget();
|
||
|
|
|
||
|
|
BOOL IsValid() { return (_hwndLock && _hwndScroll); }
|
||
|
|
void SetCallback(IDelegateDropTargetCB* pdtcb);
|
||
|
|
HRESULT Init(); // init lock + scroll windows
|
||
|
|
friend IDropTarget* DelegateDropTarget_CreateInstance(IDelegateDropTargetCB* pdtcb);
|
||
|
|
|
||
|
|
private:
|
||
|
|
void _ReleaseCurrentDropTarget();
|
||
|
|
|
||
|
|
// the below are parameters we use to implement this IDropTarget
|
||
|
|
HWND _hwndLock;
|
||
|
|
HWND _hwndScroll;
|
||
|
|
|
||
|
|
// the object we are dragging
|
||
|
|
LPDATAOBJECT _pDataObj; // from DragEnter()/Drop()
|
||
|
|
|
||
|
|
// the below indicate the current drag state
|
||
|
|
BITBOOL _fPrime:1; // TRUE iff _itemOver/_grfKeyState is valid
|
||
|
|
DWORD_PTR _itemOver; // item we are visually dragging over
|
||
|
|
IDropTarget* _pdtCur; // drop target for _itemOver
|
||
|
|
DWORD _grfKeyState; // cached key state
|
||
|
|
DWORD _dwEffectOut; // last *pdwEffect out
|
||
|
|
POINT _ptLast; // last dragged position
|
||
|
|
|
||
|
|
// for scrolling
|
||
|
|
RECT _rcLockWindow; // WindowRect of hwnd for DAD_ENTER
|
||
|
|
AUTO_SCROLL_DATA _asd; // for auto scrolling
|
||
|
|
|
||
|
|
} ;
|
||
|
|
|
||
|
|
// dummy drop target to only call DAD_DragEnterEx() on DragEnter();
|
||
|
|
|
||
|
|
class CDropDummy : public IDropTarget
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
// *** IUnknown ***
|
||
|
|
virtual STDMETHODIMP_(ULONG) AddRef(void);
|
||
|
|
virtual STDMETHODIMP_(ULONG) Release(void);
|
||
|
|
virtual STDMETHODIMP QueryInterface(REFIID riid, LPVOID * ppvObj);
|
||
|
|
|
||
|
|
// *** IDropTarget methods ***
|
||
|
|
virtual STDMETHODIMP DragEnter(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
|
||
|
|
virtual STDMETHODIMP DragOver(DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
|
||
|
|
virtual STDMETHODIMP DragLeave(void)
|
||
|
|
{
|
||
|
|
DAD_DragLeave();
|
||
|
|
return(S_OK);
|
||
|
|
};
|
||
|
|
virtual STDMETHODIMP Drop(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect)
|
||
|
|
{
|
||
|
|
DragLeave();
|
||
|
|
return(S_OK);
|
||
|
|
};
|
||
|
|
|
||
|
|
CDropDummy(HWND hwndLock) : _hwndLock(hwndLock), _cRef(1) { return; };
|
||
|
|
protected:
|
||
|
|
~CDropDummy() { return; };
|
||
|
|
private:
|
||
|
|
HWND _hwndLock; // window for dummy drop target.
|
||
|
|
int _cRef;
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
#endif // _DROPTGT_H_
|