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 (i.e. to use in WM_COMMAND, SendMessage() with WM_SETFONT).
On changing text color I think that I need an interaction betweenWM_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.

I can't really see anything blatantly wong with the logic -- try putting in debug statements and/or breakpoints to see the values of variables and why it is always showing blue? — Edward Clements
– Edward Clements, Commented Mar 24, 2014 at 12:16
That was my mess , variables were not declared as static. Thanks for reply. — dimmg
– dimmg, Commented Mar 24, 2014 at 22:36

Edward Clements · Accepted Answer · 2021-08-31 13:47:51Z

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; }

@rhauder_ - indeed. Just create a variable that will serve as a boolean flag. If flag set and if ((HWND)lParam == hWndEdit) then you run the code. Just set/toggle/clear the flag in your button handler, then invalidate the edit control.

aquirdturtle · Accepted Answer · 2016-01-10 04:08:25Z

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.

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