c++ - 更改按钮按下时的文本颜色 WIN32

Question

如何在按下按钮时更改编辑框中的文本颜色？ (Win32/C++)。我知道如何更改文本字体(即在 WM_COMMAND、SendMessage() 中使用WM_SETFONT)。
关于更改文本颜色，我认为我需要在WM_COMMAND、WM_CTLCOLOREDIT 和SendMessage() 之间进行交互，但不知道用什么样的参数。谢谢你。

我已经想出如何在单个按钮上执行此操作。请再问一个问题。如果我将上面的代码用于 3 个不同的按钮，它不会按预期运行。有一个片段:

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;
}

并且在 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;

永远是蓝色。

Answer 1

你需要

a) 一个全局 bool 值，指示是否需要更改颜色(比如 bEditRed)

b) 按下按钮时:设置/切换 bEditRed 并使编辑框无效 InvalidateRect(hWndEdit, NULL, TRUE)

c) 在对话过程中处理“WM_CTLCOLOREDIT”消息:

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;
}