CODEWITHSUNDEEP
winapilabelbackground-color
Jack
Jack

Reputation: 16724

Is InvalidateRect() enough to ask system to redraw a static control background?

I need to change the font color and background color of a static control. That colors is set by handling the WM_CTLCOLORSTATIC message:

   case WM_CTLCOLORSTATIC:
    {
        HDC hdcStatic = (HDC) wParam;
        SetTextColor(hdcStatic, RGB(fColor.R, fColor.G,fColor.B));  
        SetBkMode(hdcStatic, TRANSPARENT);
        if(hBrush) DeleteObject(hBruash); // free previous brush
        hBrush = CreateSolidBrush(RGB(bColor.R, bColor.G, bColor.B));
        return (LRESULT) hBrush;
    }

I'm calling InvalidateRect() like this, from a button click:

case WM_COMMAND:
    
    switch(LOWORD(wParam))
    {
      case BUTTONA_ID:
         InvalidateRect(hLabel, NULL, TRUE);
      break;
    }

break;

It this the proper way to ask to the label to be redraw and change its font and background colors?

Upvotes: 0

Views: 269

Answers (1)

Zeus
Zeus

Reputation: 3890

It this the proper way to ask to the label to be redraw and change its font and background colors?

Yes,a static control doesn't necessarily erase its background prior to drawing the text.

So you can force the control to be invalid, so that you can easily redraw the text without having to perform other additional calls.

More reference: CStatic does not invalidate every time its text is changed

Upvotes: 1

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