385 lines
9.8 KiB
C++
385 lines
9.8 KiB
C++
//**********************************************************************
|
||
// File name: IDS.CPP
|
||
//
|
||
// Implementation file for CDropSource
|
||
//
|
||
// Functions:
|
||
//
|
||
// See IDS.H for class definition
|
||
//
|
||
// Copyright (c) 1992 - 1993 Microsoft Corporation. All rights reserved.
|
||
//**********************************************************************
|
||
|
||
#include "pre.h"
|
||
#include "app.h"
|
||
#include "doc.h"
|
||
#include "site.h"
|
||
#include "dxferobj.h"
|
||
|
||
|
||
|
||
|
||
//+-------------------------------------------------------------------------
|
||
//
|
||
// Member: CSimpleDoc::FailureNotifyHelper(
|
||
//
|
||
// Synopsis: Report a drag drop error
|
||
//
|
||
// Arguments: [pszMsg] - Message
|
||
// [dwData] - Data to print out
|
||
//
|
||
// Algorithm: Print a message box for fatal errors during drag drop
|
||
// operation.
|
||
//
|
||
// History: dd-mmm-yy Author Comment
|
||
// 06-May-94 Ricksa author
|
||
//
|
||
//--------------------------------------------------------------------------
|
||
void CSimpleDoc::FailureNotifyHelper(TCHAR *pszMsg, DWORD dwData)
|
||
{
|
||
TCHAR pszBuf[256];
|
||
|
||
wsprintf(pszBuf, TEXT("%s %lx"), pszMsg, dwData);
|
||
|
||
MessageBox(m_hDocWnd, pszBuf, TEXT("Drag/Drop Error"), MB_OK);
|
||
}
|
||
|
||
|
||
|
||
//**********************************************************************
|
||
//
|
||
// CSimpleDoc::QueryDrag
|
||
//
|
||
// Purpose:
|
||
//
|
||
// Check to see if Drag operation should be initiated based on the
|
||
// current position of the mouse.
|
||
//
|
||
// Parameters:
|
||
//
|
||
// POINT pt - position of mouse
|
||
//
|
||
// Return Value:
|
||
//
|
||
// BOOL - TRUE if drag should take place,
|
||
// else FALSE
|
||
//
|
||
// Function Calls:
|
||
// Function Location
|
||
//
|
||
// CSimpleSite::GetObjRect SITE.CPP
|
||
// PtInRect Windows API
|
||
//
|
||
//
|
||
//********************************************************************
|
||
|
||
BOOL CSimpleDoc::QueryDrag(POINT pt)
|
||
{
|
||
// if pt is within rect of object, then start drag
|
||
if (m_lpSite)
|
||
{
|
||
RECT rect;
|
||
m_lpSite->GetObjRect(&rect);
|
||
return ( PtInRect(&rect, pt) ? TRUE : FALSE );
|
||
}
|
||
else
|
||
return FALSE;
|
||
}
|
||
|
||
|
||
//**********************************************************************
|
||
//
|
||
// CSimpleDoc::DoDragDrop
|
||
//
|
||
// Purpose:
|
||
//
|
||
// Actually perform a drag/drop operation with the current
|
||
// selection in the source document.
|
||
//
|
||
// Parameters:
|
||
//
|
||
// none.
|
||
//
|
||
// Return Value:
|
||
//
|
||
// DWORD - returns the result effect of the
|
||
// drag/drop operation:
|
||
// DROPEFFECT_NONE,
|
||
// DROPEFFECT_COPY,
|
||
// DROPEFFECT_MOVE, or
|
||
// DROPEFFECT_LINK
|
||
//
|
||
// Function Calls:
|
||
// Function Location
|
||
//
|
||
// CDataXferObj::Create DXFEROBJ.CPP
|
||
// CDataXferObj::QueryInterface DXFEROBJ.CPP
|
||
// CDataXferObj::Release DXFEROBJ.CPP
|
||
// DoDragDrop OLE API
|
||
// TestDebugOut Windows API
|
||
// MessageBox Windows API
|
||
//
|
||
//
|
||
//********************************************************************
|
||
|
||
DWORD CSimpleDoc::DoDragDrop (void)
|
||
{
|
||
DWORD dwEffect = 0;
|
||
LPDATAOBJECT lpDataObj;
|
||
|
||
TestDebugOut("In CSimpleDoc::DoDragDrop\r\n");
|
||
|
||
// Create a data transfer object by cloning the existing OLE object
|
||
CDataXferObj FAR* pDataXferObj = CDataXferObj::Create(m_lpSite,NULL);
|
||
|
||
if (! pDataXferObj)
|
||
{
|
||
MessageBox(NULL, TEXT("Out-of-memory"), TEXT("SimpDnD"),
|
||
MB_SYSTEMMODAL | MB_ICONHAND);
|
||
return DROPEFFECT_NONE;
|
||
}
|
||
|
||
// initially obj is created with 0 refcnt. this QI will make it go to 1.
|
||
pDataXferObj->QueryInterface(IID_IDataObject, (LPVOID FAR*)&lpDataObj);
|
||
assert(lpDataObj);
|
||
|
||
m_fLocalDrop = FALSE;
|
||
m_fLocalDrag = TRUE;
|
||
|
||
HRESULT hRes;
|
||
hRes=::DoDragDrop(lpDataObj,
|
||
&m_DropSource,
|
||
m_lpApp->m_dwSourceEffect, // we only allow copy
|
||
&dwEffect);
|
||
|
||
if (hRes!=ResultFromScode(S_OK)
|
||
&& hRes!=ResultFromScode(DRAGDROP_S_DROP)
|
||
&& hRes!=ResultFromScode(DRAGDROP_S_CANCEL))
|
||
{
|
||
FailureNotifyHelper(
|
||
TEXT("Unexpected error from DoDragDrop"), hRes);
|
||
}
|
||
|
||
// Validate the responses
|
||
if (hRes == ResultFromScode(DRAGDROP_S_DROP))
|
||
{
|
||
// Drop was successful so make sure the effects make sense
|
||
if (((dwEffect & m_lpApp->m_dwSourceEffect) == 0)
|
||
&& (dwEffect != DROPEFFECT_NONE))
|
||
{
|
||
FailureNotifyHelper(
|
||
TEXT("Unexpected Effect on DRAGDROP_S_DROP from DoDragDrop"),
|
||
dwEffect);
|
||
}
|
||
}
|
||
else if ((hRes == ResultFromScode(DRAGDROP_S_CANCEL))
|
||
|| (hRes == ResultFromScode(S_OK)))
|
||
{
|
||
// Drop was cancelled/or never happened so the effect s/b none
|
||
if (dwEffect != DROPEFFECT_NONE)
|
||
{
|
||
FailureNotifyHelper(
|
||
TEXT("Unexpected Effect on S_OK or Cancel from DoDragDrop"),
|
||
dwEffect);
|
||
}
|
||
}
|
||
|
||
m_fLocalDrag = FALSE;
|
||
|
||
/* if after the Drag/Drop modal (mouse capture) loop is finished
|
||
** and a drag MOVE operation was performed, then we must delete
|
||
** the selection that was dragged.
|
||
*/
|
||
if ( (dwEffect & DROPEFFECT_MOVE) != 0 )
|
||
{
|
||
// Dump our object - we never save it.
|
||
m_lpApp->lCreateDoc(m_lpApp->m_hAppWnd, 0, 0, 0);
|
||
}
|
||
|
||
pDataXferObj->Release(); // this should destroy the DataXferObj
|
||
return dwEffect;
|
||
}
|
||
|
||
|
||
|
||
//**********************************************************************
|
||
//
|
||
// CDropSource::QueryInterface
|
||
//
|
||
// Purpose:
|
||
//
|
||
// Return a pointer to a requested interface
|
||
//
|
||
// Parameters:
|
||
//
|
||
// REFIID riid - ID of interface to be returned
|
||
// LPVOID FAR* ppvObj - Location to return the interface
|
||
//
|
||
// Return Value:
|
||
//
|
||
// S_OK - Interface supported
|
||
// E_NOINTERFACE - Interface NOT supported
|
||
//
|
||
// Function Calls:
|
||
// Function Location
|
||
//
|
||
// TestDebugOut Windows API
|
||
// CSimpleDoc::QueryInterface DOC.CPP
|
||
//
|
||
//
|
||
//********************************************************************
|
||
|
||
STDMETHODIMP CDropSource::QueryInterface(REFIID riid, LPVOID FAR* ppvObj)
|
||
{
|
||
TestDebugOut("In IDS::QueryInterface\r\n");
|
||
|
||
// delegate to the document
|
||
return m_pDoc->QueryInterface(riid, ppvObj);
|
||
}
|
||
|
||
|
||
//**********************************************************************
|
||
//
|
||
// CDropSource::AddRef
|
||
//
|
||
// Purpose:
|
||
//
|
||
// Increments the reference count of CSimpleDoc. Since CDropSource is
|
||
// a nested class of CSimpleDoc, we don't need a separate reference
|
||
// count for the CDropSource. We can safely use the reference count
|
||
// of CSimpleDoc here.
|
||
//
|
||
// Parameters:
|
||
//
|
||
// None
|
||
//
|
||
// Return Value:
|
||
//
|
||
// The new reference count of CSimpleDoc
|
||
//
|
||
// Function Calls:
|
||
// Function Location
|
||
//
|
||
// CSimpleDoc::AddRef DOC.CPP
|
||
// TestDebugOut Windows API
|
||
//
|
||
//
|
||
//********************************************************************
|
||
|
||
STDMETHODIMP_(ULONG) CDropSource::AddRef()
|
||
{
|
||
TestDebugOut("In IDS::AddRef\r\n");
|
||
|
||
// delegate to the document Object
|
||
return m_pDoc->AddRef();
|
||
}
|
||
|
||
//**********************************************************************
|
||
//
|
||
// CDropSource::Release
|
||
//
|
||
// Purpose:
|
||
//
|
||
// Decrements the reference count of CSimpleDoc. Since CDropSource is
|
||
// a nested class of CSimpleDoc, we don't need a separate reference
|
||
// count for the CDropSource. We can safely use the reference count
|
||
// of CSimpleDoc here.
|
||
//
|
||
// Parameters:
|
||
//
|
||
// None
|
||
//
|
||
// Return Value:
|
||
//
|
||
// The new reference count of CSimpleDoc
|
||
//
|
||
// Function Calls:
|
||
// Function Location
|
||
//
|
||
// CSimpleDoc::Release DOC.CPP
|
||
// TestDebugOut Windows API
|
||
//
|
||
//
|
||
//********************************************************************
|
||
|
||
STDMETHODIMP_(ULONG) CDropSource::Release()
|
||
{
|
||
TestDebugOut("In IDS::Release\r\n");
|
||
|
||
// delegate to the document object
|
||
return m_pDoc->Release();
|
||
}
|
||
|
||
//**********************************************************************
|
||
//
|
||
// CDropSource::QueryContinueDrag
|
||
//
|
||
// Purpose:
|
||
//
|
||
// Called to determine if a drop should take place or be canceled.
|
||
//
|
||
// Parameters:
|
||
//
|
||
// BOOL fEscapePressed - TRUE if ESCAPE key has been pressed
|
||
// DWORD grfKeyState - key state
|
||
//
|
||
// Return Value:
|
||
//
|
||
// DRAGDROP_S_CANCEL - drag operation should be canceled
|
||
// DRAGDROP_S_DROP - drop operation should be performed
|
||
// S_OK - dragging should continue
|
||
//
|
||
//
|
||
// Function Calls:
|
||
// Function Location
|
||
//
|
||
// ResultFromScode OLE API
|
||
//
|
||
//
|
||
//********************************************************************
|
||
|
||
STDMETHODIMP CDropSource::QueryContinueDrag (
|
||
BOOL fEscapePressed,
|
||
DWORD grfKeyState
|
||
)
|
||
{
|
||
if (fEscapePressed)
|
||
return ResultFromScode(DRAGDROP_S_CANCEL);
|
||
else
|
||
if (!(grfKeyState & MK_LBUTTON))
|
||
return ResultFromScode(DRAGDROP_S_DROP);
|
||
else
|
||
return NOERROR;
|
||
}
|
||
|
||
|
||
//**********************************************************************
|
||
//
|
||
// CDropSource::GiveFeedback
|
||
//
|
||
// Purpose:
|
||
//
|
||
// Called to set cursor feedback
|
||
//
|
||
// Parameters:
|
||
//
|
||
// DWORD dwEffect - drop operation to give feedback for
|
||
//
|
||
// Return Value:
|
||
//
|
||
// DRAGDROP_S_USEDEFAULTCURSORS - tells OLE to use standard cursors
|
||
//
|
||
// Function Calls:
|
||
// Function Location
|
||
//
|
||
// ResultFromScode OLE API
|
||
//
|
||
//
|
||
//********************************************************************
|
||
|
||
STDMETHODIMP CDropSource::GiveFeedback (DWORD dwEffect)
|
||
{
|
||
return ResultFromScode(DRAGDROP_S_USEDEFAULTCURSORS);
|
||
}
|
||
|