78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
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//**********************************************************************
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// File name: idt.h
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//
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// Definition of CDropTarget
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//
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// Copyright (c) 1992 - 1993 Microsoft Corporation. All rights reserved.
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//**********************************************************************
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#if !defined( _IDT_H_ )
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#define _IDT_H_
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#include <assert.h>
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class CSimpleDoc;
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/* Flags to control direction for drag scrolling */
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typedef enum tagSCROLLDIR {
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SCROLLDIR_NULL = 0,
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SCROLLDIR_UP = 1,
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SCROLLDIR_DOWN = 2,
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SCROLLDIR_RIGHT = 3,
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SCROLLDIR_LEFT = 4
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} SCROLLDIR;
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interface CDropTarget : public IDropTarget
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{
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int m_nCount; // reference count
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CSimpleDoc FAR * m_pDoc;
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BOOL m_fCanDropCopy;
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BOOL m_fCanDropLink;
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DWORD m_dwSrcAspect;
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RECT m_rcDragRect;
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POINT m_ptLast;
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BOOL m_fDragFeedbackDrawn;
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DWORD m_dwTimeEnterScrollArea; // time of entering scroll border region
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DWORD m_dwLastScrollDir; // current dir for drag scroll
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DWORD m_dwNextScrollTime; // time for next scroll
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CDropTarget(CSimpleDoc FAR * pDoc) {
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TestDebugOut("In IDT's constructor\r\n");
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m_pDoc = pDoc;
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m_nCount = 0;
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m_fCanDropCopy = FALSE;
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m_fCanDropLink = FALSE;
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m_fDragFeedbackDrawn = FALSE;
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m_dwTimeEnterScrollArea = 0L;
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m_dwNextScrollTime = 0L;
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m_dwLastScrollDir = SCROLLDIR_NULL;
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};
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~CDropTarget() {
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TestDebugOut("In IDT's destructor\r\n");
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assert(m_nCount == 0);
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} ;
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STDMETHODIMP QueryInterface (REFIID riid, LPVOID FAR* ppv);
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STDMETHODIMP_(ULONG) AddRef ();
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STDMETHODIMP_(ULONG) Release ();
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// *** IDropTarget methods ***
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STDMETHODIMP DragEnter (LPDATAOBJECT pDataObj, DWORD grfKeyState,
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POINTL pt, LPDWORD pdwEffect);
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STDMETHODIMP DragOver (DWORD grfKeyState, POINTL pt, LPDWORD pdwEffect);
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STDMETHODIMP DragLeave ();
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STDMETHODIMP Drop (LPDATAOBJECT pDataObj, DWORD grfKeyState, POINTL pt,
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LPDWORD pdwEffect);
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private:
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// Drag/Drop support methods
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BOOL QueryDrop (DWORD grfKeyState, POINTL pointl, BOOL fDragScroll,
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LPDWORD lpdwEffect);
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BOOL DoDragScroll( POINTL pointl );
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void InitDragFeedback(LPDATAOBJECT pDataObj, POINTL pointl);
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void DrawDragFeedback( POINTL pointl );
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void UndrawDragFeedback( void );
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};
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#endif // _IDT_H_
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