Change text color on button push WIN32

Question

How do I change the text color from an edit box on button push? (Win32/C++). I know how to change the text font (ie to use in WM_COMMAND , SendMessage() with WM_SETFONT ).
On changing text color I think that I need an interaction between WM_COMMAND , WM_CTLCOLOREDIT , and SendMessage() but don't know with what kind of parameter . Thank you.

I've figured how to do this on single button. One more question please. If I use the code above for 3 different buttons, it doesn't behave as expected . There is a snippet :
case IDC_BUTTON3: textFlagRed = textFlagRed; textFlagBlue = !textFlagBlue; textFlagGreen = !textFlagGreen; InvalidateRect(textArea2, NULL, TRUE); break; case IDC_BUTTON4: textFlagGreen = textFlagGreen; textFlagBlue = !textFlagBlue; textFlagRed = !textFlagRed; InvalidateRect(textArea2, NULL, TRUE); break; case IDC_BUTTON5: textFlagBlue = textFlagBlue; textFlagRed = !textFlagRed; textFlagGreen = !textFlagGreen; InvalidateRect(textArea2, NULL, TRUE); break;

and in WM_CTLCOLORSTATIC

if (textFlagRed && (HWND)lParam == textArea2) { HBRUSH hbr = (HBRUSH) DefWindowProc(hwnd, message, wParam, lParam); SetTextColor((HDC) wParam, RGB(255, 0, 0)); return (BOOL) hbr; } else if (textFlagBlue && (HWND)lParam == textArea2) { HBRUSH hbr = (HBRUSH) DefWindowProc(hwnd, message, wParam, lParam); SetTextColor((HDC) wParam, RGB(0, 0, 255)); return (BOOL) hbr; } else if (textFlagGreen && (HWND)lParam == textArea2) { HBRUSH hbr = (HBRUSH) DefWindowProc(hwnd, message, wParam, lParam); SetTextColor((HDC) wParam, RGB(0, 255, 0)); return (BOOL) hbr; } break;

Always is the blue color.

Answer 1

You need to

a) a global boolean to indicate if the colour needs to be chaanged (say bEditRed )

b) on button push: set/toggle bEditRed and invalidate the edit box InvalidateRect(hWndEdit, NULL, TRUE)

c) handle the `WM_CTLCOLOREDIT' message in your dialog proc:

case WM_CTLCOLOREDIT:
    if (bEditRed && (HWND)lParam == hWndEdit)
    {   HBRUSH hbr = (HBRUSH) DefWindowProc(hDlg, iMessage, wParam, lParam);
        SetTextColor((HDC) wParam, RGB(255, 0, 0));
        return (BOOL) hbr;
    }
    return FALSE;

Answer 2

An alternative to Edward's answer is to use

RedrawWindow(windowHandle, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW);

instead of

InvalidateRect(windowHandle, NULL, TRUE)

The former will immediately redraw your window, while the latter will not redraw it until the main window is available again.