wzddlg.cpp

《vc++扩展编程实例》源码。运用Visual C++ 5.0或6.0的高级编程技巧

// WzdDlg.cpp : implementation file
//

#include "stdafx.h"
#include "wzd.h"
#include "WzdDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CWzdDialog dialog


CWzdDialog::CWzdDialog(CWnd* pParent /*=NULL*/)
	: CDialog(CWzdDialog::IDD, pParent)
{
	//{{AFX_DATA_INIT(CWzdDialog)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	m_bPressed=FALSE;
	m_bitmapPressed.LoadBitmapEx(IDB_PRESSED_BITMAP,TRUE);
	m_bitmapUnpressed.LoadBitmapEx(IDB_UNPRESSED_BITMAP,TRUE);
}


void CWzdDialog::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CWzdDialog)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CWzdDialog, CDialog)
	//{{AFX_MSG_MAP(CWzdDialog)
	ON_WM_NCPAINT()
	ON_WM_NCLBUTTONDOWN()
	ON_WM_ACTIVATE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWzdDialog message handlers


void CWzdDialog::OnNcPaint() 
{
	// draw caption first
	CDialog::OnNcPaint();

	// then draw button on top
	DrawButton();
}

// caption is also redrawn with WM_ACTIVATE message for color change
void CWzdDialog::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized) 
{
	CDialog::OnActivate(nState, pWndOther, bMinimized);
	
	DrawButton();
}

void CWzdDialog::OnNcLButtonDown(UINT nHitTest, CPoint point) 
{
	if (nHitTest == HTCAPTION)
	{
		// see if in area we reserved for button
		CRect rect;
		GetButtonRect(rect);
		if (rect.PtInRect(point))
		{
			m_bPressed = !m_bPressed;
			DrawButton();
		}
	}
	CDialog::OnNcLButtonDown(nHitTest, point);
}

void CWzdDialog::GetButtonRect(CRect& rect) 
{
	GetWindowRect(&rect);

	rect.top += GetSystemMetrics(SM_CYFRAME)+1;						// for small caption use SM_CYDLGFRAME
	rect.bottom = rect.top + GetSystemMetrics(SM_CYSIZE)-4;			// for small caption use SM_CYSMSIZE
	rect.left = rect.right - GetSystemMetrics(SM_CXFRAME) - 		// for small caption use SM_CXDLGFRAME
								( 2 * 								// set to number of buttons already in caption + 1
							 GetSystemMetrics(SM_CXSIZE))-1;		// for small caption use SM_CXSMSIZE
	rect.right = rect.left + GetSystemMetrics(SM_CXSIZE)-3;			// for small caption use SM_CXSMSIZE
}

void CWzdDialog::DrawButton() 
{
	// if window isn't visible or is minimized, skip
	if (!IsWindowVisible() || IsIconic())
		return;

	// get appropriate bitmap
	CDC memDC;
	CDC* pDC = GetWindowDC();
	memDC.CreateCompatibleDC(pDC);
	memDC.SelectObject(m_bPressed ? &m_bitmapPressed : &m_bitmapUnpressed);

	// get button rect and convert into non-client area coordinates
	CRect rect, rectWnd;
	GetButtonRect(rect);
	GetWindowRect(rectWnd);
	rect.OffsetRect(-rectWnd.left, -rectWnd.top);

	// draw it
	pDC->StretchBlt( rect.left, rect.top, rect.Width(), rect.Height(), 
				 &memDC, 0, 0, m_bitmapPressed.m_Width, m_bitmapPressed.m_Height, SRCCOPY );

	memDC.DeleteDC();
	ReleaseDC(pDC);
}