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CHAP05
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SCHMOO
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POLYLINE.CPP
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C/C++ Source or Header
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1993-06-17
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30KB
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1,347 lines
/*
* POLYLINE.CPP
* Modified for Chapter 5.
*
* Implementation of the CPolyline class.
*
* Copyright (c)1993 Microsoft Corporation, All Rights Reserved
*
* Kraig Brockschmidt, Software Design Engineer
* Microsoft Systems Developer Relations
*
* Internet : kraigb@microsoft.com
* Compuserve: >INTERNET:kraigb@microsoft.com
*/
#include "schmoo.h"
/*
* CPolyline:CPolyline
* CPolyline::~CPolyline
*
* Constructor Parameters:
* hInst HINSTANCE of the application we're in.
*/
CPolyline::CPolyline(HINSTANCE hInst)
: CWindow(hInst)
{
m_pAdv=NULL;
m_hWnd=NULL;
return;
}
CPolyline::~CPolyline(void)
{
return;
}
/*
* CPolyline::FInit
*
* Purpose:
* Instantiates a polyline window within a given parent. The
* parent may be a main application window, could be an MDI child
* window. We really do not care.
*
* Parameters:
* hWndParent HWND of the parent of this window
* pRect LPRECT that this window should occupy
* dwStyle DWORD containing the window's style flags
* uID UINT ID to associate with this window
* pAdv LPCPolylineAdviseSink of the sink wanting our notifications.
*
* Return Value:
* BOOL TRUE if the function succeeded, FALSE otherwise.
*/
BOOL CPolyline::FInit(HWND hWndParent, LPRECT pRect, DWORD dwStyle, UINT uID
, LPCPolylineAdviseSink pAdv)
{
m_hWnd=CreateWindowEx(WS_EX_NOPARENTNOTIFY, SZCLASSPOLYLINE
, SZCLASSPOLYLINE, dwStyle, pRect->left, pRect->top
, pRect->right-pRect->left, pRect->bottom-pRect->top
, hWndParent, (HMENU)uID, m_hInst, (LPVOID)this);
if (NULL!=m_hWnd)
m_pAdv=pAdv;
return (NULL!=m_hWnd);
}
/*
* CPolyline::New
*
* Purpose:
* Cleans out and reinitializes the data to defaults.
*
* Parameters:
* None
*
* Return Value:
* None
*/
void CPolyline::New(void)
{
UINT i;
m_pl.wVerMaj=VERSIONMAJOR;
m_pl.wVerMin=VERSIONMINOR;
//Our rectangle is the size of our window's client area.
GetClientRect(m_hWnd, &m_pl.rc);
//Clean out the POLYLINE structure and repaint the window.
for (i=0; i< CPOLYLINEPOINTS; i++)
{
m_pl.rgpt[i].x=0;
m_pl.rgpt[i].y=0;
}
m_pl.cPoints =0;
m_pl.rgbBackground=GetSysColor(COLOR_WINDOW);
m_pl.rgbLine =GetSysColor(COLOR_WINDOWTEXT);
m_pl.iLineStyle =PS_SOLID;
InvalidateRect(m_hWnd, NULL, TRUE);
UpdateWindow(m_hWnd);
//Inform the advise sink of this data change.
if (NULL!=m_pAdv)
m_pAdv->OnDataChange();
return;
}
/*
* CPolyline::Undo
*
* Purpose:
* Reverses previous actions in a Polyline.
*
* Parameters:
* None
*
* Return Value:
* BOOL TRUE if we can Undo more, FALSE otherwise.
*/
BOOL CPolyline::Undo(void)
{
//Decrement the number of active points and repaint.
if (m_pl.cPoints > 0)
{
m_pl.cPoints--;
InvalidateRect(m_hWnd, NULL, TRUE);
UpdateWindow(m_hWnd);
}
if (NULL!=m_pAdv)
m_pAdv->OnPointChange();
//Return if we can undo any more.
return (0!=m_pl.cPoints);
}
//CHAPTER5MOD
/*
* CPolyline::ReadFromStorage
*
* Purpose:
* Loads our data (any known version) from an IStoraeg returning
* the version number of the data or an error value.
*
* Parameters:
* pIStorage LPSTORAGE from which we'll read.
*
* Return Value:
* LONG Version number or negative POLYLINE_E_* value.
*/
LONG CPolyline::ReadFromStorage(LPSTORAGE pIStorage)
{
POLYLINEDATA pl;
ULONG cb=-1;
ULONG cbExpect=0;
LPSTREAM pIStream;
HRESULT hr;
LARGE_INTEGER li;
if (NULL==pIStorage)
return POLYLINE_E_READFAILURE;
//Open the CONTENTS stream
hr=pIStorage->OpenStream("CONTENTS", 0, STGM_DIRECT | STGM_READ
| STGM_SHARE_EXCLUSIVE, 0, &pIStream);
if (FAILED(hr))
return POLYLINE_E_READFAILURE;
//Read version numbers and seek back to file beginning.
hr=pIStream->Read((LPVOID)&pl, 2*sizeof(WORD), &cb);
if (FAILED(hr) || 2*sizeof(WORD)!=cb)
{
pIStream->Release();
return POLYLINE_E_READFAILURE;
}
LISet32(li, 0);
pIStream->Seek(li, STREAM_SEEK_SET, NULL);
/*
* For version 2.0, read the entire file. For version 1.0 read
* the file up to CBPOLYLINEDATAVER10. For anything else, give an
* error.
*/
switch (pl.wVerMaj)
{
case VERSIONMAJOR: //2.x
switch (pl.wVerMin)
{
case VERSIONMINOR: //2.0
cbExpect=CBPOLYLINEDATA;
break;
default:
break;
}
break;
case 1: //1.x
switch (pl.wVerMin)
{
case 0: //1.0
cbExpect=CBPOLYLINEDATA10;
break;
default:
break;
}
break;
default:
break;
}
if (0==cbExpect)
{
pIStream->Release();
return POLYLINE_E_UNSUPPORTEDVERSION;
}
hr=pIStream->Read((LPVOID)&pl, cbExpect, &cb);
pIStream->Release();
if (cbExpect!=cb)
return POLYLINE_E_READFAILURE;
/*
* If we loaded successfully, make the data current. By using DataSet
* we centralize our version upgrading. We size the polyline window
* to the data AND notify the document so it sizes to the polyline.
*/
DataSet(&pl, TRUE, TRUE);
//Return what version we just loaded.
return MAKELONG(pl.wVerMin, pl.wVerMaj);
}
/*
* CPolyline::WriteToStorage
*
* Purpose:
* Ignorantly writes our current data into an storage in a particular
* version.
*
* Parameters:
* pIStorage LPSTORAGE in which to save.
* lVer LONG providing version number Major (HI) and Minor (Low)
*
* Return Value:
* LONG A POLYLINE_E_* value.
*/
LONG CPolyline::WriteToStorage(LPSTORAGE pIStorage, LONG lVer)
{
ULONG cb;
ULONG cbExpect=0;
WORD wVerMaj=HIWORD(lVer);
WORD wVerMin=LOWORD(lVer);
POLYLINEDATA pl;
LPSTREAM pIStream;
HRESULT hr;
if (NULL==pIStorage)
return POLYLINE_E_READFAILURE;
//Get a copy of our data in the version we're going to save.
DataGet(&pl, lVer);
switch (wVerMaj)
{
case VERSIONMAJOR: //2.x
switch (wVerMin)
{
case VERSIONMINOR: //2.0
cbExpect=CBPOLYLINEDATA;
break;
default:
break;
}
break;
case 1: //1.x
switch (wVerMin)
{
case 0: //1.0
cbExpect=CBPOLYLINEDATA10;
break;
default:
break;
}
break;
default:
break;
}
if (0==cbExpect)
return POLYLINE_E_UNSUPPORTEDVERSION;
hr=pIStorage->CreateStream("CONTENTS", STGM_DIRECT | STGM_CREATE
| STGM_WRITE | STGM_SHARE_EXCLUSIVE, 0, 0, &pIStream);
if (FAILED(hr))
return POLYLINE_E_WRITEFAILURE;
hr=pIStream->Write((LPVOID)&pl, cbExpect, &cb);
pIStream->Release();
if (FAILED(hr) || cbExpect!=cb)
return POLYLINE_E_WRITEFAILURE;
return POLYLINE_E_NONE;
}
//End CHAPTER5MOD
/*
* CPolyline::ReadFromFile
*
* Purpose:
* Loads our data (any known version) from a file handle returning
* the ver