Win32 对话框(4)

4.21 如何使用ENTER键控制对话框中控件的输入焦点

将键盘转回Tab建

BOOL CDemoDlg::PreTranslateMessage(MSG* pMsg) 
{
    //将按键为ENTER的WM_KEYDOWN消息转换成按键为TAB的消息
    if (pMsg->message == WM_KEYDOWN)
    {
        if (pMsg->wParam == VK_RETURN)
        {
            pMsg->wParam = VK_TAB;
        }
    }

    return CDialog::PreTranslateMessage(pMsg);
}

4.22 如何屏蔽对话框按ESC或ENTER键退出

还是一样,直接返回TRUE,什么事情也不发生

BOOL CDemoDlg::PreTranslateMessage(MSG* pMsg) 
{
    if (pMsg->message == WM_KEYDOWN)
    {
        if (pMsg->wParam == VK_RETURN || pMsg->wParam == VK_ESCAPE)
        {
            return TRUE;
        }
    }

    return CDialog::PreTranslateMessage(pMsg);
}

4.23 如何设置应用程序中对话框的默认颜色

http://blog.163.com/wenxianliang08@126/blog/static/8358326320101020173473/

//设置对话框的默认颜色
SetDialogBkColor(RGB(0x99, 0xCC, 0xFF), RGB(0xFF, 0x00, 0x00));

4.24 如何创建消息对话框

即MessageBox,没啥好说的

void CDemoDlg::OnShowDlg1() 
{
    MessageBox(_T("MessageBox函数创建的消息对话框"), 
        _T("Demo"), MB_ICONEXCLAMATION);    
}

void CDemoDlg::OnShowDlg2() 
{
    AfxMessageBox(_T("AfxMessageBox函数创建的消息对话框"));    
}

4.25 如何实现对话框在桌面工作区的停靠

一种思想,当左右pos少于50的时候就更改pos

void CDemoDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos) 
{
    CDialog::OnWindowPosChanging(lpwndpos);
    
    //获得桌面工作区大小
    CRect rect;
    SystemParametersInfo(SPI_GETWORKAREA, 0, &rect, 0);

    //左停靠
    if (abs(lpwndpos->x - rect.left) <= 50)
    {
        lpwndpos->x = rect.left;
        lpwndpos->y = rect.top;
        lpwndpos->cy = rect.Height();
    }
    //右停靠
    else if (abs(lpwndpos->x + lpwndpos->cx-rect.right) <= 50)
    {
        lpwndpos->x = rect.right - lpwndpos->cx;
        lpwndpos->y = rect.top;
        lpwndpos->cy = rect.Height();
    }
    else
    {
        lpwndpos->cy = m_nHeigh;
    }

    if (lpwndpos->y < rect.top)
    {
        lpwndpos->y = rect.top;
    }
}

4.26 如何在客户区中移动对话框