331 lines
7.8 KiB
C++
331 lines
7.8 KiB
C++
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//**********************************************************************
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// File name: IDS.CPP
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//
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// Implementation file for CDropSource
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//
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// Functions:
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//
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// See IDS.H for class definition
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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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#include "pre.h"
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#include "doc.h"
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#include "site.h"
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#include "dxferobj.h"
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//**********************************************************************
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//
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// CSimpleDoc::QueryDrag
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//
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// Purpose:
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//
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// Check to see if Drag operation should be initiated based on the
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// current position of the mouse.
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//
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// Parameters:
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//
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// POINT pt - position of mouse
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//
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// Return Value:
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//
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// BOOL - TRUE if drag should take place,
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// else FALSE
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//
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// Function Calls:
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// Function Location
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//
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// CSimpleSite::GetObjRect SITE.CPP
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// PtInRect Windows API
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//
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// Comments:
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//
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//********************************************************************
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BOOL CSimpleDoc::QueryDrag(POINT pt)
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{
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// if pt is within rect of object, then start drag
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if (m_lpSite)
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{
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RECT rect;
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m_lpSite->GetObjRect(&rect);
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return ( PtInRect(&rect, pt) ? TRUE : FALSE );
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}
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else
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return FALSE;
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}
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//**********************************************************************
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//
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// CSimpleDoc::DoDragDrop
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//
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// Purpose:
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//
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// Actually perform a drag/drop operation with the current
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// selection in the source document.
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//
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// Parameters:
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//
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// none.
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//
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// Return Value:
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//
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// DWORD - returns the result effect of the
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// drag/drop operation:
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// DROPEFFECT_NONE,
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// DROPEFFECT_COPY,
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// DROPEFFECT_MOVE, or
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// DROPEFFECT_LINK
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//
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// Function Calls:
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// Function Location
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//
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// CDataXferObj::Create DXFEROBJ.CPP
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// CDataXferObj::QueryInterface DXFEROBJ.CPP
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// CDataXferObj::Release DXFEROBJ.CPP
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// DoDragDrop OLE API
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// TestDebugOut Windows API
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//
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// Comments:
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//
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//********************************************************************
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DWORD CSimpleDoc::DoDragDrop (void)
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{
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DWORD dwEffect = 0;
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LPDATAOBJECT lpDataObj;
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TestDebugOut("In CSimpleDoc::DoDragDrop\r\n");
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// Create a data transfer object by cloning the existing OLE object
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CDataXferObj FAR* pDataXferObj = CDataXferObj::Create(m_lpSite,NULL);
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if (! pDataXferObj) {
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MessageBox(NULL,"Out-of-memory","SimpDnD",MB_SYSTEMMODAL|MB_ICONHAND);
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return DROPEFFECT_NONE;
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}
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// initially obj is created with 0 refcnt. this QI will make it go to 1.
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pDataXferObj->QueryInterface(IID_IDataObject, (LPVOID FAR*)&lpDataObj);
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assert(lpDataObj);
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m_fLocalDrop = FALSE;
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m_fLocalDrag = TRUE;
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::DoDragDrop ( lpDataObj,
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&m_DropSource,
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DROPEFFECT_COPY, // we only allow copy
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&dwEffect
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);
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m_fLocalDrag = FALSE;
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/* if after the Drag/Drop modal (mouse capture) loop is finished
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** and a drag MOVE operation was performed, then we must delete
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** the selection that was dragged.
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*/
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if ( (dwEffect & DROPEFFECT_MOVE) != 0 ) {
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// ... delete source object here (we do NOT support MOVE)
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}
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pDataXferObj->Release(); // this should destroy the DataXferObj
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return dwEffect;
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}
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//**********************************************************************
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//
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// CDropSource::QueryInterface
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//
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// Purpose:
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//
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// Return a pointer to a requested interface
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//
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// Parameters:
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//
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// REFIID riid - ID of interface to be returned
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// LPVOID FAR* ppvObj - Location to return the interface
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//
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// Return Value:
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//
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// S_OK - Interface supported
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// E_NOINTERFACE - Interface NOT supported
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//
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// Function Calls:
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// Function Location
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//
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// TestDebugOut Windows API
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// CSimpleDoc::QueryInterface DOC.CPP
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//
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// Comments:
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//
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//********************************************************************
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STDMETHODIMP CDropSource::QueryInterface(REFIID riid, LPVOID FAR* ppvObj)
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{
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TestDebugOut("In IDS::QueryInterface\r\n");
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// delegate to the document
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return m_pDoc->QueryInterface(riid, ppvObj);
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}
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//**********************************************************************
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//
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// CDropSource::AddRef
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//
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// Purpose:
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//
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// Increments the reference count on this interface
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//
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// Parameters:
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//
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// None
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//
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// Return Value:
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//
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// The current reference count on this interface.
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//
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// Function Calls:
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// Function Location
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//
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// CSimpleObj::AddReff OBJ.CPP
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// TestDebugOut Windows API
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//
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// Comments:
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//
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// This function adds one to the ref count of the interface,
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// and calls then calls CSimpleDoc to increment its ref.
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// count.
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//
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//********************************************************************
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STDMETHODIMP_(ULONG) CDropSource::AddRef()
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{
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TestDebugOut("In IDS::AddRef\r\n");
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// increment the interface reference count (for debugging only)
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++m_nCount;
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// delegate to the document Object
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return m_pDoc->AddRef();
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}
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//**********************************************************************
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//
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// CDropSource::Release
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//
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// Purpose:
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//
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// Decrements the reference count on this interface
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//
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// Parameters:
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//
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// None
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//
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// Return Value:
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//
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// The current reference count on this interface.
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//
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// Function Calls:
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// Function Location
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//
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// CSimpleObj::Release OBJ.CPP
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// TestDebugOut Windows API
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//
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// Comments:
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//
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// This function subtracts one from the ref count of the interface,
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// and calls then calls CSimpleDoc to decrement its ref.
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// count.
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//
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//********************************************************************
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STDMETHODIMP_(ULONG) CDropSource::Release()
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{
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TestDebugOut("In IDS::Release\r\n");
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// decrement the interface reference count (for debugging only)
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--m_nCount;
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// delegate to the document object
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return m_pDoc->Release();
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}
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//**********************************************************************
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//
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// CDropSource::QueryContinueDrag
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//
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// Purpose:
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//
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// Called to determine if a drop should take place or be canceled.
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//
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// Parameters:
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//
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// BOOL fEscapePressed - TRUE if ESCAPE key has been pressed
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// DWORD grfKeyState - key state
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//
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// Return Value:
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//
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// DRAGDROP_S_CANCEL - drag operation should be canceled
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// DRAGDROP_S_DROP - drop operation should be performed
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// S_OK - dragging should continue
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//
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//
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// Function Calls:
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// Function Location
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//
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// ResultFromScode OLE API
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//
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// Comments:
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//
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//********************************************************************
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STDMETHODIMP CDropSource::QueryContinueDrag (
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BOOL fEscapePressed,
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DWORD grfKeyState
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)
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{
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if (fEscapePressed)
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return ResultFromScode(DRAGDROP_S_CANCEL);
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else if (!(grfKeyState & MK_LBUTTON))
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return ResultFromScode(DRAGDROP_S_DROP);
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else
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return NOERROR;
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}
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//**********************************************************************
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//
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// CDropSource::GiveFeedback
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//
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// Purpose:
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//
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// Called to set cursor feedback
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//
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// Parameters:
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//
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// DWORD dwEffect - drop operation to give feedback for
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//
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// Return Value:
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//
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// DRAGDROP_S_USEDEFAULTCURSORS - tells OLE to use standard cursors
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//
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// Function Calls:
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// Function Location
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//
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// ResultFromScode OLE API
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//
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// Comments:
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//
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//********************************************************************
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STDMETHODIMP CDropSource::GiveFeedback (DWORD dwEffect)
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{
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return ResultFromScode(DRAGDROP_S_USEDEFAULTCURSORS);
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}
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