ctrltrans demodlg.cpp

MFC 使控件透明。很小的一个例子

// CtrlTrans DemoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "CtrlTrans Demo.h"
#include "CtrlTrans DemoDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CCtrlTransDemoDlg dialog

CCtrlTransDemoDlg::CCtrlTransDemoDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCtrlTransDemoDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CCtrlTransDemoDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
    m_Back.LoadBitmap(IDB_BACK);
}

void CCtrlTransDemoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCtrlTransDemoDlg)
	DDX_Control(pDX, IDC_EDIT1, m_edtTrans);
	DDX_Control(pDX, IDC_STATIC1, m_stcTrans);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCtrlTransDemoDlg, CDialog)
	//{{AFX_MSG_MAP(CCtrlTransDemoDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BTN_TEXT, OnBtnText)
	ON_BN_CLICKED(IDC_BTN_BACK, OnBtnBack)
	ON_BN_CLICKED(IDC_BTN_BACK_TRAN, OnBtnBackTran)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCtrlTransDemoDlg message handlers

BOOL CCtrlTransDemoDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	m_stcTrans.SetWindowText("StaticTrans sample");
    
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CCtrlTransDemoDlg::OnPaint() 
{
    CPaintDC dc(this); // device context for painting
    CDC      MemDC;
    BITMAP   bit;
    
    m_Back.GetBitmap(&bit);
    MemDC.CreateCompatibleDC(&dc);
    MemDC.SelectObject(m_Back); 
    dc.BitBlt(0, 0, bit.bmWidth, bit.bmHeight, &MemDC, 0, 0, SRCCOPY);
    
    if (IsIconic())
	{
		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CCtrlTransDemoDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}


void CCtrlTransDemoDlg::OnBtnText() 
{
    if (m_ColDlg.DoModal() == IDOK) {
        m_edtTrans.SetTextColor(m_ColDlg.GetColor());    
        m_stcTrans.SetTextColor(m_ColDlg.GetColor());    
    }
}

void CCtrlTransDemoDlg::OnBtnBack() 
{
    if (m_ColDlg.DoModal() == IDOK) {
        m_edtTrans.SetBackColor(m_ColDlg.GetColor());	
        m_stcTrans.SetBackColor(m_ColDlg.GetColor());	
    }
}

void CCtrlTransDemoDlg::OnBtnBackTran() 
{
    m_edtTrans.SetBackColor(TRANS_BACK);	
    m_stcTrans.SetBackColor(TRANS_BACK);	
}