WM_CTLCOLOR消息 .

参考文章:白乔原创:VC之美化界面篇

        在每个控件开始绘制之前,都会向其父窗口发送WM_CTLCOLOR通告消息,在该消息的处理函数中,可以设置控件显示文本的前景色、背景色以及字体。该消息处理函数还要求返回一个画刷的句柄,用于在控件具体的绘制之前擦除其客户区。

        WM_CTLCOLOR映射消息处理函数为afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)。
    常用代码为:

  1. pDC->SetTextColor(RGB(255, 0, 0));    //设置文本前景色   
  2. pDC->SetBkColor(RGB(255, 255, 255));  //设置文本背景色   
  3. pDC->SetBkMode(TRANSPARENT);          //TRANSPARENT或OPAQUE   
  4. pDC->SelectObject(...)  
pDC->SetTextColor(RGB(255, 0, 0));    //设置文本前景色
pDC->SetBkColor(RGB(255, 255, 255));  //设置文本背景色
pDC->SetBkMode(TRANSPARENT);          //TRANSPARENT或OPAQUE
pDC->SelectObject(...)

        简单示例如下:

  1. //   
  2. //m_font1与m_font2为CTestDlg的成员,类型为CFont   
  3. //   
  4. BOOL CTestDlg::OnInitDialog()  
  5. {  
  6.         ......  
  7.     // TODO: Add extra initialization here   
  8.         m_font1.CreatePointFont(120,  TEXT("Impact"));   
  9.         m_font2.CreatePointFont(120,  TEXT("Arial"));  
  10.         ......  
  11. }  
  12.   
  13. HBRUSH CTestDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)  
  14. {  
  15.     HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);  
  16.   
  17.     // TODO:  Change any attributes of the DC here   
  18.     if (nCtlColor == CTLCOLOR_STATIC)  
  19.     {  
  20.         switch (pWnd->GetDlgCtrlID())  
  21.         {  
  22.         case IDC_STATIC_1:  
  23.             pDC->SetTextColor(RGB(255, 0, 0));  
  24.             pDC->SetBkColor(RGB(255, 255, 255));  
  25.             pDC->SetBkMode(TRANSPARENT);  
  26.             pDC->SelectObject(&m_font1);  
  27.             return (HBRUSH)::GetStockObject(BLACK_BRUSH);  
  28.             break;  
  29.         case IDC_STATIC_2:  
  30.             pDC->SetTextColor(RGB(255, 255, 0));  
  31.             pDC->SetBkColor(RGB(255, 255, 255));  
  32.             pDC->SelectObject(&m_font2);  
  33.             return (HBRUSH)::GetStockObject(BLACK_BRUSH);  
  34.             break;  
  35.         default:  
  36.             break;  
  37.         }  
  38.     }  
  39.   
  40.     // TODO:  Return a different brush if the default is not desired   
  41.     return hbr;  
  42. }  
//
//m_font1与m_font2为CTestDlg的成员,类型为CFont
//
BOOL CTestDlg::OnInitDialog()
{
        ......
	// TODO: Add extra initialization here
        m_font1.CreatePointFont(120,  TEXT("Impact")); 
        m_font2.CreatePointFont(120,  TEXT("Arial"));
        ......
}

HBRUSH CTestDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

	// TODO:  Change any attributes of the DC here
	if (nCtlColor == CTLCOLOR_STATIC)
	{
		switch (pWnd->GetDlgCtrlID())
		{
		case IDC_STATIC_1:
			pDC->SetTextColor(RGB(255, 0, 0));
			pDC->SetBkColor(RGB(255, 255, 255));
			pDC->SetBkMode(TRANSPARENT);
			pDC->SelectObject(&m_font1);
			return (HBRUSH)::GetStockObject(BLACK_BRUSH);
			break;
		case IDC_STATIC_2:
			pDC->SetTextColor(RGB(255, 255, 0));
			pDC->SetBkColor(RGB(255, 255, 255));
			pDC->SelectObject(&m_font2);
			return (HBRUSH)::GetStockObject(BLACK_BRUSH);
			break;
		default:
			break;
		}
	}

	// TODO:  Return a different brush if the default is not desired
	return hbr;
}


        说明一

OnCtlColor中的nCtlColor可为:
    CTLCOLOR_BTN       Button control
    CTLCOLOR_DLG       Dialog box
    CTLCOLOR_EDIT      Edit control
    CTLCOLOR_LISTBOX    List-box control
    CTLCOLOR_MSGBOX     Message box
    CTLCOLOR_SCROLLBAR  Scroll-bar control
    CTLCOLOR_STATIC     Static control

        可见,WM_CTLCOLOR可作用于按钮控件CButton、编辑框控件CEdit、ListBox控件、Static控件、滚动条控件,也可作用于对话框本身。
        注意:前面讲WM_CTLCOLOR为通告消息,也即是子控件发送给父窗口的,但对于对话框本身,它能收到nCtlColor为CTLCOLOR_DLG的WM_CTLCOLOR消息,这是自身发给自身的,显然,这时不是通告消息。

示例:

  1. HBRUSH CTestDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)  
  2. {  
  3.     HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);  
  4.   
  5.     // TODO:  Change any attributes of the DC here   
  6.     if (nCtlColor == CTLCOLOR_DLG)  
  7.         return (HBRUSH)::GetStockObject(BLACK_BRUSH);  
  8.     else  
  9.         pDC->SetTextColor(RGB(255, 0, 0));  
  10.   
  11.     // TODO:  Return a different brush if the default is not desired   
  12.     return hbr;  
  13. }  
HBRUSH CTestDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

	// TODO:  Change any attributes of the DC here
	if (nCtlColor == CTLCOLOR_DLG)
		return (HBRUSH)::GetStockObject(BLACK_BRUSH);
	else
		pDC->SetTextColor(RGB(255, 0, 0));

	// TODO:  Return a different brush if the default is not desired
	return hbr;
}


    说明二
    OnCtlColor消息里面的处理对PushButton是不起作用的,由说明一中的示例效果也可以看出,而对CheckBox和RadioButton是OK的。附上CSDN给出的解释:
    Buttons with the BS_PUSHBUTTON, BS_DEFPUSHBUTTON, or BS_PUSHLIKE styles do not use the returned brush. Buttons with these styles are always drawn with the default system colors. Drawing push buttons requires several different brushes-face, highlight, and shadow-but the WM_CTLCOLORBTN message allows only one brush to be returned. To provide a custom appearance for push buttons, use an owner-drawn button.
    所以,对PushButton只能将其设置为owner-drawn button,然后响应控件通告消息WM_DRAWITEM来处理,该消息的响应函数原型为afx_msg void OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)。

    
    说明三:对ComboBox控件的应用
ComboBox控件包含一个EditBox,当单击展开的时候,会出现一个ListBox列出所有的项目,注意,这时ListBox控件的父窗口不是这个ComboBox,而是ComboBox的父窗口。
    所以,如果要在代码中设置某个ComboBox所显示文字的字体颜色为红色(EditBox以及下拉ListBox中的文字),假设该ComboBox的ID为IDC_COMBO,则使用如下代码将无任何作用。
  1. if (pWnd->GetDlgCtrlID() == IDC_COMBO)  
  2. {  
  3.     pDC->SetTextColor(RGB(255, 0, 0));  
  4. }  
if (pWnd->GetDlgCtrlID() == IDC_COMBO)
{
    pDC->SetTextColor(RGB(255, 0, 0));
}
EditBox以及下拉ListBox中的文字颜色均没有改变。
    以下对话框中有两个ComboBox控件m_combo1,m_combo2。现要使m_combo1中显示的文字颜色为红色,而m_combo2为默认。代码如下
  1. HBRUSH CTestDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)  
  2. {  
  3.     HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);  
  4.   
  5.     // TODO:  Change any attributes of the DC here   
  6.   
  7.     //对m_combo1的EditBox(该EditBox的父窗口为m_combo1)   
  8.     if (nCtlColor == CTLCOLOR_EDIT  
  9.         && pWnd->GetParent()->GetDlgCtrlID() == m_combo1.GetDlgCtrlID())  
  10.     {  
  11.         pDC->SetTextColor(RGB(255, 0, 0));  
  12.     }  
  13.   
  14.     //对m_combo1下拉的ListBox   
  15.     if (nCtlColor == CTLCOLOR_LISTBOX  
  16.         && m_combo1.GetParent()->GetDlgCtrlID() == pWnd->GetParent()->GetDlgCtrlID())  
  17.     {  
  18.         //获取ListBox和m_combo1的屏幕坐标范围   
  19.         RECT rectListBox;  
  20.         RECT rectComboBox;  
  21.         pWnd->GetWindowRect(&rectListBox);  
  22.         m_combo1.GetWindowRect(&rectComboBox);  
  23.         //如果该ListBox刚好在m_combo1的下面,则是单击m_combo1产生的下拉ListBox   
  24.         if (rectListBox.left == rectComboBox.left  
  25.             && rectListBox.top == rectComboBox.bottom)  
  26.         {  
  27.             pDC->SetTextColor(RGB(255, 0, 0));  
  28.         }  
  29.     }  
  30.   
  31.     // TODO:  Return a different brush if the default is not desired   
  32.     return hbr;  
  33. }  
HBRUSH CTestDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

	// TODO:  Change any attributes of the DC here

	//对m_combo1的EditBox(该EditBox的父窗口为m_combo1)
	if (nCtlColor == CTLCOLOR_EDIT
		&& pWnd->GetParent()->GetDlgCtrlID() == m_combo1.GetDlgCtrlID())
	{
		pDC->SetTextColor(RGB(255, 0, 0));
	}

	//对m_combo1下拉的ListBox
	if (nCtlColor == CTLCOLOR_LISTBOX
		&& m_combo1.GetParent()->GetDlgCtrlID() == pWnd->GetParent()->GetDlgCtrlID())
	{
		//获取ListBox和m_combo1的屏幕坐标范围
		RECT rectListBox;
		RECT rectComboBox;
		pWnd->GetWindowRect(&rectListBox);
		m_combo1.GetWindowRect(&rectComboBox);
		//如果该ListBox刚好在m_combo1的下面,则是单击m_combo1产生的下拉ListBox
		if (rectListBox.left == rectComboBox.left
			&& rectListBox.top == rectComboBox.bottom)
		{
			pDC->SetTextColor(RGB(255, 0, 0));
		}
	}

	// TODO:  Return a different brush if the default is not desired
	return hbr;
}

效果如下:

更简单的办法是:利用向导新增MFC类CMyComboBox : CComboBox,再增加WM_CTLCOLOR消息的响应函数。(注意:ComboBox下的EditBox和ListBox均会向ComboBox窗口发送WM_CTLCOLOR消息,如果在ComboBox对应的消息映射表没有找到对应的处理函数,再向CComboBox的父窗口发送WM_CTLCOLOR消息,具体可参考文章WM_NOTIFY消息流程实例分析
  1. BEGIN_MESSAGE_MAP(CMyComboBox, CComboBox)  
  2.     ON_WM_CTLCOLOR()  
  3. END_MESSAGE_MAP()  
  4.   
  5. HBRUSH CMyComboBox::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)  
  6. {  
  7.     HBRUSH hbr = CComboBox::OnCtlColor(pDC, pWnd, nCtlColor);  
  8.   
  9.     // TODO:  Change any attributes of the DC here   
  10.     pDC->SetTextColor(RGB(255, 255, 0));  
  11.   
  12.     // TODO:  Return a different brush if the default is not desired   
  13.     return hbr;  
  14. }  
BEGIN_MESSAGE_MAP(CMyComboBox, CComboBox)
	ON_WM_CTLCOLOR()
END_MESSAGE_MAP()

HBRUSH CMyComboBox::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CComboBox::OnCtlColor(pDC, pWnd, nCtlColor);

	// TODO:  Change any attributes of the DC here
	pDC->SetTextColor(RGB(255, 255, 0));

	// TODO:  Return a different brush if the default is not desired
	return hbr;
}
pDC->SetTextColor(RGB(255, 255, 0));一句代码就可以实现上面的功能。

    说明四、WM_CTLCOLOR为通告消息,所以也可以在反射消息中处理。
ON_WM_CTLCOLOR_REFLECT()


from:http://blog.csdn.net/wangyao1052/article/details/8070393
原文地址:https://www.cnblogs.com/lidabo/p/2804246.html