POLYLINE.CPP
/*
* POLYLINE.CPP
* Polyline Component Chapter 10
*
* Implementation of the CPolyline class that we expose as a
* component object.
*
* Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
*
* Kraig Brockschmidt, Microsoft
* Internet : kraigb@microsoft.com
* Compuserve: >INTERNET:kraigb@microsoft.com
*/
#include "polyline.h"
/*
* CPolyline:CPolyline
* CPolyline::~CPolyline
*
* Constructor Parameters:
* pUnkOuter LPUNKNOWN of the controlling unknown.
* pfnDestroy PFNDESTROYED to call when an object is
* destroyed.
* hInst HINSTANCE of the application we're in.
*/
CPolyline::CPolyline(LPUNKNOWN pUnkOuter, PFNDESTROYED pfnDestroy
, HINSTANCE hInst)
{
m_hWnd=NULL;
m_hInst=hInst;
m_cRef=0;
m_pUnkOuter=pUnkOuter;
m_pfnDestroy=pfnDestroy;
m_fDirty=FALSE;
m_pImpIPolyline=NULL;
m_pImpIConnPtCont=NULL;
m_pAdv=NULL;
m_pConnPt=NULL;
m_pST =NULL;
m_cf =0;
//CHAPTER10MOD
m_clsID=CLSID_Polyline10;
//End CHAPTER10MOD
m_pIStorage=NULL;
m_pIStream =NULL;
m_pImpIPersistStorage=NULL;
m_pImpIPersistStreamInit=NULL;
//CHAPTER10MOD
m_pImpIDataObject =NULL;
m_pIDataAdviseHolder=NULL;
//End CHAPTER10MOD
return;
}
CPolyline::~CPolyline(void)
{
if (NULL!=m_pST)
delete m_pST;
//CHAPTER10MOD
ReleaseInterface(m_pIDataAdviseHolder);
DeleteInterfaceImp(m_pImpIDataObject);
//End CHAPTER10MOD
DeleteInterfaceImp(m_pImpIPersistStreamInit);
DeleteInterfaceImp(m_pImpIPersistStorage);
ReleaseInterface(m_pIStream);
ReleaseInterface(m_pIStorage);
DeleteInterfaceImp(m_pImpIConnPtCont);
DeleteInterfaceImp(m_pImpIPolyline);
ReleaseInterface(m_pAdv);
ReleaseInterface(m_pConnPt);
return;
}
/*
* CPolyline::Init
*
* Purpose:
* Performs any intiailization of a CPolyline that's prone to
* failure that we also use internally before exposing the
* object outside this DLL.
*
* Parameters:
* None
*
* Return Value:
* BOOL TRUE if the function is successful,
* FALSE otherwise.
*/
BOOL CPolyline::Init(void)
{
LPUNKNOWN pIUnknown=this;
if (NULL!=m_pUnkOuter)
pIUnknown=m_pUnkOuter;
m_pST=new CStringTable(m_hInst);
if (!m_pST->Init(IDS_POLYLINEMIN, IDS_POLYLINEMAX))
return FALSE;
m_cf=RegisterClipboardFormat(SZPOLYLINECLIPFORMAT);
m_pImpIPersistStorage=new CImpIPersistStorage(this, pIUnknown);
if (NULL==m_pImpIPersistStorage)
return FALSE;
m_pImpIPersistStreamInit=new CImpIPersistStreamInit(this
, pIUnknown);
if (NULL==m_pImpIPersistStreamInit)
return FALSE;
m_pImpIPolyline=new CImpIPolyline(this, pIUnknown);
if (NULL==m_pImpIPolyline)
return FALSE;
m_pImpIConnPtCont=new CImpIConnPtCont(this, pIUnknown);
if (NULL==m_pImpIConnPtCont)
return FALSE;
m_pConnPt=new CConnectionPoint(this);
if (NULL==m_pConnPt)
return FALSE;
m_pConnPt->AddRef(); //Reversed in destructor
//CHAPTER10MOD
m_pImpIDataObject=new CImpIDataObject(this, pIUnknown);
if (NULL==m_pImpIDataObject)
return FALSE;
//End CHAPTER10MOD
return TRUE;
}
/*
* CPolyline::QueryInterface
* CPolyline::AddRef
* CPolyline::Release
*
* Purpose:
* IUnknown members for CPolyline object.
*/
STDMETHODIMP CPolyline::QueryInterface(REFIID riid, PPVOID ppv)
{
*ppv=NULL;
if (IID_IUnknown==riid)
*ppv=this;
if (IID_IConnectionPointContainer==riid)
*ppv=m_pImpIConnPtCont;
//CHAPTER10MOD
if (IID_IPolyline10==riid)
*ppv=m_pImpIPolyline;
//End CHAPTER10MOD
if (IID_IPersistStorage==riid)
*ppv=m_pImpIPersistStorage;
if (IID_IPersist==riid || IID_IPersistStream==riid
|| IID_IPersistStreamInit==riid)
*ppv=m_pImpIPersistStreamInit;
//CHAPTER10MOD
if (IID_IDataObject==riid)
*ppv=m_pImpIDataObject;
//End CHAPTER10MOD
if (NULL!=*ppv)
{
((LPUNKNOWN)*ppv)->AddRef();
return NOERROR;
}
return ResultFromScode(E_NOINTERFACE);
}
STDMETHODIMP_(ULONG) CPolyline::AddRef(void)
{
return ++m_cRef;
}
STDMETHODIMP_(ULONG) CPolyline::Release(void)
{
if (0L!=--m_cRef)
return m_cRef;
if (NULL!=m_pfnDestroy)
(*m_pfnDestroy)();
delete this;
return 0L;
}
/*
* CPolyline::RectConvertMappings
*
* Purpose:
* Converts the contents of a rectangle from device (MM_TEXT) or
* HIMETRIC to the other.
*
* Parameters:
* pRect LPRECT containing the rectangle to convert.
* fToDevice BOOL TRUE to convert from HIMETRIC to device,
* FALSE to convert device to HIMETRIC.
*
* Return Value:
* None
*/
void CPolyline::RectConvertMappings(LPRECT pRect, BOOL fToDevice)
{
HDC hDC;
int iLpx, iLpy;
if (NULL==pRect)
return;
hDC=GetDC(NULL);
iLpx=GetDeviceCaps(hDC, LOGPIXELSX);
iLpy=GetDeviceCaps(hDC, LOGPIXELSY);
ReleaseDC(NULL, hDC);
if (fToDevice)
{
pRect->left=MulDiv(iLpx, pRect->left, HIMETRIC_PER_INCH);
pRect->top =MulDiv(iLpy, pRect->top , HIMETRIC_PER_INCH);
pRect->right =MulDiv(iLpx, pRect->right, HIMETRIC_PER_INCH);
pRect->bottom=MulDiv(iLpy, pRect->bottom,HIMETRIC_PER_INCH);
}
else
{
pRect->left=MulDiv(pRect->left, HIMETRIC_PER_INCH, iLpx);
pRect->top =MulDiv(pRect->top , HIMETRIC_PER_INCH, iLpy);
pRect->right =MulDiv(pRect->right, HIMETRIC_PER_INCH, iLpx);
pRect->bottom=MulDiv(pRect->bottom,HIMETRIC_PER_INCH, iLpy);
}
return;
}
//CHAPTER10MOD
//Functions now internal due to IDataObject
/*
* CPolyline::DataSet
*
* Purpose:
* Sets the current data in this Polyline to a given structure.
*
* Parameters:
* pplIn PPOLYLINEDATA to initialize to.
* fSizeToData BOOL indicating if we're to size to the data
* or scale it.
* fNotify BOOL indicating if we're to send an advise
* on this change.
*
* Return Value:
* HRESULT NOERROR if successful, otherwise a
* POLYLINE_E_ value.
*/
STDMETHODIMP CPolyline::DataSet(PPOLYLINEDATA pplIn
, BOOL fSizeToData, BOOL fNotify)
{
RECT rc;
/*
* Copy the structure in pplIn and repaint to reflect the
* new point set. Note that unlike the RectSet message, we
* do no scaling, assuming that the rect in the structure
* is appropriate for the data.
*/
if (NULL==pplIn)
return ResultFromScode(POLYLINE_E_INVALIDPOINTER);
m_pl=*pplIn;
//CHAPTER10MOD
m_fDirty=TRUE;
//Inform our parent of the data change
if (NULL!=m_pIDataAdviseHolder)
{
m_pIDataAdviseHolder->SendOnDataChange(m_pImpIDataObject
, DVASPECT_CONTENT, ADVF_NODATA);
}
//End CHAPTER10MOD
/*
* If we're scaling the window to fit the data, then use
* RectSet passing our current rectangle as the new one.
* That makes sure that the data won't change but that the
* window is resized.
*/
if (fSizeToData)
{
POINT pt;
/*
* Get our offset in the parent window so we can RectSet
* to the right place since RectSet expects rectangle in
* parent coordinates and we get it in client coordinates.
*/
GetWindowRect(m_hWnd, &rc);
pt.x=rc.left;
pt.y=rc.top;
ScreenToClient(GetParent(m_hWnd), &pt);
RECTSTORECT(m_pl.rc, rc);
OffsetRect(&rc, pt.x, pt.y);
//This will also cause a repaint.
m_pImpIPolyline->RectSet(&rc, fNotify);
}
else
{
//Make sure we're updated.
InvalidateRect(m_hWnd, NULL, TRUE);
UpdateWindow(m_hWnd);
}
return NOERROR;
}
/*
* CPolyline::DataGet
*
* Purpose:
* Retrieves the Polyline's current data.
*
* Parameters:
* pplIn PPOLYLINEDATA into which we copy the data.
*
* Return Value:
* HRESULT NOERROR if successful, otherwise a
* POLYLINE_E_ value.
*/
STDMETHODIMP CPolyline::DataGet(PPOLYLINEDATA pplIn)
{
if (NULL==pplIn)
return ResultFromScode(POLYLINE_E_INVALIDPOINTER);
*pplIn=m_pl;
return NOERROR;
}
/*
* DataGet/SetMem eliminated: no need with IDataObject.
* DataGetMem is somewhat like RenderNative below.
*/
/*
* CPolyline::RenderNative
*
* Purpose:
* Retrieves the Polyline's data in a global memory handle.
*
* Parameters:
* phMem HGLOBAL * in which to store the handle.
*
* Return Value:
* HRESULT NOERROR if successful, otherwise a
* POLYLINE_E_ value.
*/
STDMETHODIMP CPolyline::RenderNative(HGLOBAL *phMem)
{
HGLOBAL hMem;
PPOLYLINEDATA ppl;
HRESULT hr=ResultFromScode(POLYLINE_E_INVALIDPOINTER);
if (NULL==phMem)
return ResultFromScode(POLYLINE_E_INVALIDPOINTER);
hMem=GlobalAlloc(GMEM_DDESHARE | GMEM_MOVEABLE, CBPOLYLINEDATA);
if (NULL!=hMem)
{
ppl=(PPOLYLINEDATA)GlobalLock(hMem);
hr=DataGet(ppl);
GlobalUnlock(hMem);
if (FAILED(hr))
{
GlobalFree(hMem);
hMem=NULL;
}
}
*phMem=hMem;
return hr;
}
/*
* CPolyline::RenderBitmap
*
* Purpose:
* Creates a bitmap image of the current Polyline.
*
* Parameters:
* phBmp HBITMAP * in which to return the bitmap.
*
* Return Value:
* HRESULT NOERROR if successful, otherwise a
* POLYLINE_E_ value.
*/
STDMETHODIMP CPolyline::RenderBitmap(HBITMAP *phBmp)
{
HDC hDC;
HDC hMemDC;
HBITMAP hBmp;
RECT rc;
HGDIOBJ hObj;
if (NULL==phBmp)
return ResultFromScode(POLYLINE_E_INVALIDPOINTER);
//Render a bitmap the size of the current rectangle.
hDC=GetDC(m_hWnd);
hMemDC=CreateCompatibleDC(hDC);
GetClientRect(m_hWnd, &rc);
hBmp=CreateCompatibleBitmap(hDC, rc.right, rc.bottom);
if (NULL!=hBmp)
{
//Draw the POLYLINEDATA into the bitmap.
hObj=SelectObject(hMemDC, hBmp);
Draw(hMemDC, FALSE, TRUE);
SelectObject(hMemDC, hObj);
}
DeleteDC(hMemDC);
ReleaseDC(m_hWnd, hDC);
*phBmp=hBmp;
return NOERROR;
}
//RenderMetafile not necessary--now part of RenderMetafilePict.
/*
* CPolyline::RenderMetafilePict
*
* Purpose:
* Renders the current Polyline into a METAFILEPICT structure in
* global memory.
*
* Parameters:
* phMem HGLOBAL * in which to return the
* METAFILEPICT.
*
* Return Value:
* HRESULT NOERROR if successful, otherwise a
* POLYLINE_E_ value.
*/
STDMETHODIMP CPolyline::RenderMetafilePict(HGLOBAL *phMem)
{
HGLOBAL hMem;
HMETAFILE hMF;
LPMETAFILEPICT pMF;
RECT rc;
HDC hDC;
if (NULL==phMem)
return ResultFromScode(POLYLINE_E_INVALIDPOINTER);
//Create a memory metafile and return its handle.
hDC=(HDC)CreateMetaFile(NULL);
if (NULL==hDC)
return ResultFromScode(STG_E_MEDIUMFULL);
SetMapMode(hDC, MM_ANISOTROPIC);
GetClientRect(m_hWnd, &rc);
SetWindowOrgEx(hDC, 0, 0, NULL);
SetWindowExtEx(hDC, rc.right, rc.bottom, NULL);
Draw(hDC, TRUE, TRUE);
hMF=CloseMetaFile(hDC);
if (NULL==hMF)
return ResultFromScode(STG_E_MEDIUMFULL);
//Allocate the METAFILEPICT structure.
hMem=GlobalAlloc(GMEM_DDESHARE | GMEM_MOVEABLE
, sizeof(METAFILEPICT));
if (NULL==hMem)
{
DeleteMetaFile(hMF);
return ResultFromScode(E_FAIL);
}
/*
* Global lock only fails in PMODE if the selector is invalid
* (like it was discarded) or references a 0 length segment,
* neither of which can happen here.
*/
pMF=(LPMETAFILEPICT)GlobalLock(hMem);
pMF->hMF=hMF;
pMF->mm=MM_ANISOTROPIC;
//Insert the extents in MM_HIMETRIC units.
GetClientRect(m_hWnd, &rc);
RectConvertMappings(&rc, FALSE);
pMF->xExt=rc.right;
pMF->yExt=rc.bottom;
GlobalUnlock(hMem);
*phMem=hMem;
return NOERROR;
}
//End CHAPTER10MOD