WM_CTLCOLOR和OnCtlColor消息的用法_界面技术

WM_CTLCOLOR和OnCtlColor消息的用法

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杂谈

WM_CTLCOLOR消息用来完成对EDIT、STATIC、BUTTON等控件设置背景和字体颜色，其用法如下：

1.首先在自己需要设置界面的对话框上点击右键-->建立类向导-->加入WM_CTLCOLOR消息-->自动生成OnCtlColor（）函数，此函数可以对本对话框的控件的界面外观做修饰，用法如下：
将类向导产生的函数做如下修改：

 HBRUSH CDialogColor::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
HBRUSH hbr = CDialog::OnCtlColor(pDC,pWnd, nCtlColor);
// TODO: Change any attributes of theDC here
//设置显示字体
CFont * cFont=new CFont;
cFont->CreateFont(16,0,0,0,FW_SEMIBOLD,FALSE,FALSE,0, 
ANSI_CHARSET,OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,
DEFAULT_PITCH&FF_SWISS,"Arial");
//对特定的控件做修改
switch(nCtlColor)
{
case CTLCOLOR_STATIC: //对所有静态文本控件的设置
{
pDC->SetBkMode(TRANSPARENT); 
//设置背景为透明
pDC->SetTextColor(RGB(255,255,0)); //设置字体颜色
pWnd->SetFont(cFont); //设置字体
HBRUSH B = CreateSolidBrush(RGB(125,125,255)); 
//创建画刷
return (HBRUSH) B; //返回画刷句柄
}
case CTLCOLOR_EDIT: //对所有编辑框的设置
{
pDC->SetBkMode(TRANSPARENT); 
pDC->SetTextColor(RGB(255,255,0)); 
pWnd->SetFont(cFont); 
HBRUSH B = CreateSolidBrush(RGB(125,125,255)); 
return (HBRUSH) B; 
}
default:
return CDialog::OnCtlColor(pDC,pWnd, nCtlColor);
}
}

 
 
switch (pWnd->GetDlgCtrlID()) 
{ 
//针对ID为IDC_CTL1、IDC_CTL2和IDC_CTL3的控件进行同样的设置
case IDC_CTL1:
case IDC_CTL2:
case IDC_CTL3: 
{
pDC->SetBkMode(TRANSPARENT);
pDC->SetTextColor(RGB(255,255, 0));
pWnd->SetFont(cFont);
HBRUSH B = CreateSolidBrush(RGB(125,125,255));
return (HBRUSH) B;
}
default:
return CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
}

 通过消息WM_CTLCOLOR我们可以改变对话框或一些特殊控件的背景颜色
1、添加WM_CTLCOLOR消息映射。
2、在CWnd::OnCtlColor里面作相应的处理
HRESULT CWnd::OnCtlColor(CDC *pDC, CWnd *pWnd, UINT nCtlColor)
{
     switch (nCtlColor)
     {
         case CTLCOLOR_BTN:                 // Button control 
         {
             pDC->SetBkColor( RGB( 255, 0, 0) );
         }
         break;
         case CTLCOLOR_DLG:                 // Dialog box 
         break;
         case CTLCOLOR_EDIT:                 // Edit control 
         {
             COLORREF bkColor = RGB(255,0,0);
             CRect rect;
             pWnd->GetClientRect(&rect); 
CBrush br;
             br.CreateSolidBrush(bkColor);
             pDC->FillRect(rect, &br);*/
             pDC->SetBkColor(bkColor);
         }
         break;
         case CTLCOLOR_LISTBOX:         // List-box control 
         break;
         case CTLCOLOR_MSGBOX:         // Message box    
         break;
         case CTLCOLOR_SCROLLBAR:   // Scroll-bar control 
         break;
         case CTLCOLOR_STATIC:             // Static control  
         break;
         default:
         break;
     }    
     return CWnd::OnCtlColor(pDC, pWnd, nCtlColor);
}