MFC - 更改cstatic文本控件的文本颜色

Question

如何更改CStatic文本控件的文本颜色？有没有一种简单的方法使用CDC :: SetTextColor？

谢谢...

Answer 1

您可以ON_WM_CTLCOLOR在对话框类中实现,而无需创建新的CStatic派生类:

BEGIN_MESSAGE_MAP(CMyDialog, CDialog)
    //{{AFX_MSG_MAP(CMyDialog)
    ON_WM_CTLCOLOR()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

HBRUSH CMyDialog::OnCtlColor(CDC* pDC, CWnd *pWnd, UINT nCtlColor)
{
    switch (nCtlColor)
    {
    case CTLCOLOR_STATIC:
        pDC->SetTextColor(RGB(255, 0, 0));
        return (HBRUSH)GetStockObject(NULL_BRUSH);
    default:
        return CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
    }
}

请注意,上面的代码设置了对话框中所有静态控件的文本.但您可以使用该pWnd变量来过滤所需的控件.

Answer 2

不幸的是,你不会在CStatic类中找到SetTextColor方法.如果要更改CStatic的文本颜色,则必须进行更多编码.

在我看来,最好的方法是创建自己的CStatic派生类(CMyStatic)并在那里发布ON_WM_CTLCOLOR_REFLECT通知消息.

BEGIN_MESSAGE_MAP(CMyStatic, CStatic)
    //{{AFX_MSG_MAP(CMyStatic)
    ON_WM_CTLCOLOR_REFLECT()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

HBRUSH CColorStatic::CtlColor(CDC* pDC, UINT nCtlColor) 
{
    pDC->SetTextColor(RGB(255,0,0)); 

    return (HBRUSH)GetStockObject(NULL_BRUSH);  
}

显然,您可以使用成员变量和setter方法来替换红色(RGB(255,0,0)).

问候.

Answer 3

只是跟踪绘画问题(透明背景),由*return(HBRUSH)GetStockObject(NULL_BRUSH)引起;*

易于更改如下:

HBRUSH hBrush = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

if (nCtlColor == CTLCOLOR_STATIC &&
    pWnd->GetSafeHwnd() == GetDlgItem(XXX)->GetSafeHwnd()
) pDC->SetTextColor(RGB(255, 0, 0));    

return hBrush;

希望这可以帮助.

Answer 4

从这里和其他地方给出的答案来看，如何创建一个派生类来代替处理着色本身的 CStatic 并不明显。

所以以下是对我有用的，使用 MSVS 2013 版本 12.0.40629.00 更新 5。我可以在资源编辑器中放置一个“静态文本”控件，然后用 TColorText 替换成员变量的类型。

在 .h 文件中：

class TColorText : public CStatic
{
protected:
  DECLARE_MESSAGE_MAP( )

public:
  // make the background transparent (or if ATransparent == true, restore the previous background color)
  void setTransparent( bool ATransparent = true );
  // set background color and make the background opaque
  void SetBackgroundColor( COLORREF );
  void SetTextColor( COLORREF );

protected:
  HBRUSH CtlColor( CDC* pDC, UINT nCtlColor );

private:
  bool MTransparent = true;
  COLORREF MBackgroundColor = RGB( 255, 255, 255 );  // default is white (in case someone sets opaque without setting a color)
  COLORREF MTextColor = RGB( 0, 0, 0 );  // default is black. it would be more clean 
                                         // to not use the color before set with SetTextColor(..), but whatever...
};

在 .cpp 文件中：

void TColorText::setTransparent( bool ATransparent )
{
  MTransparent = ATransparent;
  Invalidate( );
}

void TColorText::SetBackgroundColor( COLORREF AColor )
{
  MBackgroundColor = AColor;
  MTransparent = false;
  Invalidate( );
}

void TColorText::SetTextColor( COLORREF AColor )
{
  MTextColor = AColor;
  Invalidate( );
}

BEGIN_MESSAGE_MAP( TColorText, CStatic )
  ON_WM_CTLCOLOR_REFLECT( )
END_MESSAGE_MAP( )

HBRUSH TColorText::CtlColor( CDC* pDC, UINT nCtlColor )
{
  pDC->SetTextColor( MTextColor );
  pDC->SetBkMode( TRANSPARENT );  // we do not want to draw background when drawing text. 
                                  // background color comes from drawing the control background.
  if( MTransparent )
    return nullptr;  // return nullptr to indicate that the parent object 
                     // should supply the brush. it has the appropriate background color.
  else
    return (HBRUSH) CreateSolidBrush( MBackgroundColor );  // color for the empty area of the control
}