在RichEdit Winapi中隐藏插入符号

问题描述

我想用指定的ES_READONLY样式从RichEdit(50W)中隐藏插入记号.当插入符号闪烁且用户无法键入时，这对于用户来说非常令人困惑.
我尝试使用 HideCaret隐藏隐藏符号()函数，
但是，使用以下代码对我不起作用:

I would like to hide a caret from a RichEdit(50W) with ES_READONLY style specified.It's pretty confusing for the user, when the caret is blinking and the user can't type.
I tried to hide the caret using HideCaret() function,
however it doesn't work for me with following code:

LRESULT CALLBACK ChatMessaegsSubclassProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) // Subclassed control
{
    LRESULT ret = CallWindowProc(WndProc_ChatMessages, hwnd, msg, wParam, lParam);
    switch(msg)
    {
    //Also tried with EN_SETFOCUS
    case WM_SETFOCUS:
    {
        ret = CallWindowProc(WndProc_ChatMessages, hwnd, msg, wParam, lParam);
        HideCaret(ChatMessages); //Returns 5 (Access denied.)
        break;
    }

    //According the documentation:
    //If your application calls HideCaret five times in a row,
    //it must also call ShowCaret five times before the caret is displayed.
    case WM_KILLFOCUS: //The message is called when the RichEdit get focus, however nothing happens.
    {
        ret = CallWindowProc(WndProc_ChatMessages, hwnd, msg, wParam, lParam);
        ShowCaret(ChatMessages);
        break;
    }
    }
    return ret;
}

推荐答案

以下是解决方法:

LRESULT CALLBACK ChatMessaegsSubclassProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    LRESULT ret = CallWindowProc(WndProc_ChatMessages, hwnd, msg, wParam, lParam);
    switch(msg)
    {
    case WM_LBUTTONDOWN:
    {
        HideCaret(ChatMessages);
        break;
    }
    case WM_KILLFOCUS:
    {
        ShowCaret(ChatMessages);
        break;
    }
    }
    return ret;
}

注意仅在用户用鼠标吸引焦点时有效.因此，如果有人知道如何正确处理它，请随时回答，我会很高兴.

NOTE this only works when user induces the focus with mouse. Therefore if anyone knows how to deal with it correctly, feel free to answer, I'll be glad.

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