cdiskwizdisksizepage.cpp

vc环境下的pgp源码

		ex->Delete();
	}

}

// SetPGPdiskSize sets the size edit box and the slider to the given size.

void 
CDiskWizDiskSizePage::SetPGPdiskSize(PGPUInt32 kbSize)
{
	// Set size to legal value.
	if (kbSize < kMinPGPdiskKbSize)
	{
		kbSize = kMinPGPdiskKbSize;
	}
	else if (kbSize > mLocalMaxKbSize)
	{
		kbSize = mLocalMaxKbSize;
	}

	// More than or less than 1 meg in size?
	if (kbSize >= kKbPerMeg)
	{
		mSizeValue = kbSize/kKbPerMeg;
		UpdateData(FALSE);

		ConvertControlsToMb();
	}
	else
	{
		mSizeValue = kbSize;
		UpdateData(FALSE);

		ConvertControlsToKb();
	}
}

// GetPGPdiskSizeFromRegistry initializes the size from the value we
// previously stored in the registry.

void 
CDiskWizDiskSizePage::GetPGPdiskSizeFromRegistry()
{
	PGPdiskWin32Prefs	prefs;

	derr = GetPGPdiskWin32Prefs(prefs);

	if (derr.IsntError())
		SetPGPdiskSize(prefs.lastCreateSize);
}

// SetPGPdiskSizeInRegistry stores the current PGPdisk size in the registry.

DualErr 
CDiskWizDiskSizePage::SetPGPdiskSizeInRegistry()
{
	DualErr				derr;
	PGPdiskWin32Prefs	prefs;
	PGPUInt32			kbSize;

	UpdateData(TRUE);

	kbSize = mSizeValue;

	if (mIsSizeInMb)
		kbSize *= kKbPerMeg;

	derr = GetPGPdiskWin32Prefs(prefs);

	if (derr.IsntError())
	{
		prefs.lastCreateSize = kbSize;
		derr = SetPGPdiskWin32Prefs(prefs);
	}

	return derr;
}

// UpdateSizeFromSlider updates the size edit box from the slider position.

void 
CDiskWizDiskSizePage::UpdateSizeFromSlider()
{
	PGPInt32 pos;
	
	pos = mSizeSlider.GetPos();

	mSizeValue	= (PGPUInt32) floor((double) pos*mUnitsPerTick + 0.5);
	mSizeValue	+= (mIsSizeInMb ? 1 : kMinPGPdiskKbSize);

	UpdateData(FALSE);
}

// UpdateSliderFromSize updates the slider position from the size edit box.

void 
CDiskWizDiskSizePage::UpdateSliderFromSize()
{
	PGPUInt32 temp;

	UpdateData(TRUE);

	temp	= mSizeValue;
	temp	-= (mIsSizeInMb ? 1 : kMinPGPdiskKbSize);

	mSizeSlider.SetPos((PGPUInt32) floor((double) temp/mUnitsPerTick + 0.5));
}

// The CDiskWizDiskSizePage data exchange function.

void 
CDiskWizDiskSizePage::DoDataExchange(CDataExchange *pDX)
{
	try
	{
		CString		text;
		PGPBoolean	skipDDX	= FALSE;

		CPropertyPage::DoDataExchange(pDX);

		// Our goal is to coax MFC into accepting NULL fields for our size
		// box.

		if (mSizeEditBox.GetSafeHwnd())
			mSizeEditBox.GetWindowText(text);

		// Don't overwrite a null field with a 0.
		if (!pDX->m_bSaveAndValidate && text.IsEmpty && (mSizeValue == 0))
		{
			skipDDX = TRUE;
		}

		// Note the way the second if statement ends within the AFX_DATA_MAP.
		// This is done so our variable will still appear in the ClassWizard,
		// but allows us to skip the DDX_Text when we want to. Kewl!

		if (pDX->m_bSaveAndValidate && text.IsEmpty())
		{
			skipDDX = TRUE;
			mSizeValue = 0;
		}

		if (!skipDDX)		
		//{{AFX_DATA_MAP(CDiskWizDiskSizePage)
			DDX_Text(pDX, IDC_SIZE_EDIT, mSizeValue);
		DDX_Control(pDX, IDC_SIDEBAR, mSidebarGraphic);
		DDX_Control(pDX, IDC_SIZE_SPIN, mSizeSpin);
		DDX_Control(pDX, IDC_SIZE_EDIT, mSizeEditBox);
		DDX_Control(pDX, IDC_SIZE_SLIDER, mSizeSlider);
		DDX_Text(pDX, IDC_MAXSIZE, mMaxSizeText);
		DDX_Text(pDX, IDC_MINSIZE, mMinSizeText);
		DDX_Text(pDX, IDC_FREESIZE_TEXT, mFreeSizeText);
		//}}AFX_DATA_MAP
	}
	catch (CMemoryException *ex)
	{
		ex->Delete();
	}
}

// OnChangeSizeEdit is called when the user enters a new size in the size
// edit box. We update the slider bar accordingly.

void 
CDiskWizDiskSizePage::OnChangeSizeEdit() 
{
	if (mSizeEditBox.GetSafeHwnd())
		UpdateSliderFromSize();
}

// OnKbCheck is called when the kB button is clicked.

void 
CDiskWizDiskSizePage::OnKbCheck() 
{
	ConvertControlsToKb();	
}

// OnMbCheck is called when the MB button is clicked.

void 
CDiskWizDiskSizePage::OnMbCheck() 
{
	ConvertControlsToMb();	
}


//////////////////////////////////////////////////////////
// CDiskWizDiskSizePage protected default message handlers
//////////////////////////////////////////////////////////

// OnHelpInfo handles context-sensitive help.

BOOL 
CDiskWizDiskSizePage::OnHelpInfo(HELPINFO *pHelpInfo)
{
	if ((pHelpInfo->iContextType == HELPINFO_WINDOW) &&
		(pHelpInfo->iCtrlId != ((PGPUInt16) IDC_STATIC)))
	{
		::WinHelp((HWND) pHelpInfo->hItemHandle, App->m_pszHelpFilePath, 
			HELP_WM_HELP, (PGPUInt32) HelpIds);
	}

	return TRUE;
}

// OnHScroll is called when the user drags the slider thumb.

void 
CDiskWizDiskSizePage::OnHScroll(
	UINT		nSBCode, 
	UINT		nPos, 
	CScrollBar	*pScrollBar) 
{
	CPropertyPage::OnHScroll(nSBCode, nPos, pScrollBar);
	UpdateSizeFromSlider();
}

// OnInitDialog is overwritten to perform property page initialization.

BOOL 
CDiskWizDiskSizePage::OnInitDialog() 
{
	DualErr		dummyErr;
	File		existingFile;
	PGPUInt32	bytesFile;
	PGPUInt64	bytesFree;

	CPropertyPage::OnInitDialog();

	// This must be called first to make MFC happy.
	UpdateData(FALSE);

	// Classwizard won't subclasss our radio buttons (sniff).
	mKbButton.SubclassWindow(GetDlgItem(IDC_KB_CHECK)->GetSafeHwnd());
	mMbButton.SubclassWindow(GetDlgItem(IDC_MB_CHECK)->GetSafeHwnd());

	// How much space do we have available?
	dummyErr = App->HowMuchFreeSpace(mParentDiskWiz->mPath, &bytesFree);

	// Don't fail if the disk free call fails, but make note of it.
	if (dummyErr.IsntError())
	{
		mAreWeFailingDiskFree = FALSE;
		mKbFree = (PGPUInt32) (bytesFree / kBytesPerKb);
	}
	else
	{
		mAreWeFailingDiskFree = TRUE;
		mKbFree = kMaxPGPdiskKbSize*2;		// fake max amount of space
	}

	// If the pathname contains the name of an existing file, the user wants
	// to replace it, so add its size to the amount of free space.

	dummyErr = existingFile.mInitErr;

	if (dummyErr.IsntError())
	{
		dummyErr = existingFile.Open(mParentDiskWiz->mPath, 
			kOF_MustExist | kOF_ReadOnly);
	}

	if (dummyErr.IsntError())
	{
		existingFile.GetLength(&bytesFile);
	}

	if (dummyErr.IsntError())
	{
		mKbFree += bytesFile/kBytesPerKb;
	}

	if (existingFile.Opened())
	{
		existingFile.Close();
	}

	// Estimate roughly what size PGPdisk we can handle.
	mLocalMaxKbSize = (PGPUInt32) min(EstimateDataSizeFromDiskSize(mKbFree), 
		kMaxPGPdiskKbSize);

	// If this is less than one meg, disable the Mb button.
	if (mLocalMaxKbSize < kKbPerMeg)
		mMbButton.EnableWindow(FALSE);

	pgpAssert(mLocalMaxKbSize >= kMinPGPdiskKbSize);	// should've been checked

	// Set PGPdisk size to what we remember it as in the registry.
	GetPGPdiskSizeFromRegistry();

	try
	{
		CString freeSpaceStr, maxPGPdiskStr;

		FormatSizeString(mKbFree, freeSpaceStr.GetBuffer(kMaxStringSize), 
			kMaxStringSize);

		freeSpaceStr.ReleaseBuffer();

		FormatSizeString(mLocalMaxKbSize, 
			maxPGPdiskStr.GetBuffer(kMaxStringSize), kMaxStringSize);

		maxPGPdiskStr.ReleaseBuffer();
 
		// Update the contents of the free size message shown to the user.
		if (mAreWeFailingDiskFree)
		{
			mFreeSizeText.Format(kFreeSize3MsgString, maxPGPdiskStr);
		}
		else if (mLocalMaxKbSize == kMaxPGPdiskKbSize)
		{
			mFreeSizeText.Format(kFreeSize2MsgString, freeSpaceStr, 
				maxPGPdiskStr);
		}
		else
		{
			mFreeSizeText.Format(kFreeSize1MsgString, freeSpaceStr);
		}
	}
	catch (CMemoryException *ex)
	{
		ex->Delete();
	}

	UpdateData(FALSE);

	return TRUE;
}

// We override OnPaint to draw the sidebar graphic at the correct depth.

void 
CDiskWizDiskSizePage::OnPaint() 
{
	CDC			memDC;
	CPaintDC	DC(this);
	HBITMAP		oldBitmap;
	RECT		sidebarRect;

	DC.SelectPalette(&mParentDiskWiz->mSidebarPalette, FALSE);
	DC.RealizePalette();

	memDC.CreateCompatibleDC(&DC);
	memDC.SelectPalette(&mParentDiskWiz->mSidebarPalette, FALSE);
	memDC.RealizePalette();

	mSidebarGraphic.GetWindowRect(&sidebarRect);
	ScreenToClient(&sidebarRect);
	
	// MFC bug - CDC::SelectObject returns incorrect pointers/handles so don't
	// fool with it.

	oldBitmap = (HBITMAP) 
		::SelectObject(memDC, mParentDiskWiz->mSidebarBitmap);

	DC.BitBlt(sidebarRect.left, sidebarRect.top, sidebarRect.right, 
		sidebarRect.bottom, &memDC, 0, 0, SRCCOPY);

	memDC.SelectObject(oldBitmap);
	memDC.DeleteDC();
}