阻止用户在生成的文本之前输入

Question

我正在用 WPF（使用 C#）编写一个文本编辑器，它使用 RichTextBox 模拟聊天程序。当用户按下回车键时，相关的用户名会自动插入到下一行。但是，如果用户输入的速度足够快，在回车和其他按键之间交替，他们的文本可能会出现在生成的用户名之前。这是一个可能更好地证明这一点的屏幕截图：http://oi62.tinypic.com/fusv1j.jpg

这个问题以前比较严重，经过四处寻找后，我尝试手动将插入符号位置设置为插入后的末尾；不幸的是，如果你足够快的话，仍然有可能在首字母之前输入文本。

这是我用于 RichTextBox 的 KeyUp 事件的 C#，以及相关的辅助方法：

private void textBoxEnterPressed(object sender, KeyEventArgs e)
{
    if (e.Key != Key.Enter || initialsCheckBox.IsChecked == false)
        return;

    Chumhandle active = getActiveHandleBox().SelectedItem as Chumhandle;
    AppendText(mainTextBox, active.Initials + ": ", active.HexCode);

    TextPointer caretPos = mainTextBox.CaretPosition;
    caretPos = caretPos.DocumentEnd;
    mainTextBox.CaretPosition = caretPos;
}

private ComboBox getActiveHandleBox()
{
    if (activeBox == 1)
        return handleBox1;
    else
        return handleBox2;
}

public static void AppendText(RichTextBox box, string text, string color)
{
    BrushConverter bc = new BrushConverter();
    TextRange tr = new TextRange(box.Document.ContentEnd, box.Document.ContentEnd);
    tr.Text = text;
    try
    {
        tr.ApplyPropertyValue(TextElement.ForegroundProperty, bc.ConvertFromString(color));
    }
    catch (FormatException) { }

    box.Selection.ApplyPropertyValue(RichTextBox.ForegroundProperty, bc.ConvertFromString(color));
}

以及 RichTextBox 的 XAML：

<RichTextBox Name="mainTextBox" Grid.Row="3" FontFamily="Courier New" AcceptsReturn="True" VerticalScrollBarVisibility="Visible" BorderThickness="0" KeyUp="textBoxEnterPressed">
    <RichTextBox.Resources>
        <Style TargetType="{x:Type Paragraph}">
            <Setter Property="Margin" Value="0" />
        </Style>
    </RichTextBox.Resources>
</RichTextBox>

诚然，我不确定这是否可以解决，我只是希望用户不要那么快...

Answer 1

Adriano Repetti 在评论中得到它；我必须关闭文本框的 AcceptsReturn 并自己处理在输入键上插入新行。

You have a race with your box. Both want to handle Enter key: you in textBoxEnterPressed and RichTextBox to add a new line. I'd stop this competition setting AcceptsReturn to False. It shouldn't change anything here (unless you have a default button in your dialog) but I'd also set e.Handled to true.

Answer 2

我已经对你的代码进行了一些尝试，这就是我所管理的：

    private void textBoxEnterPressed(object sender, KeyEventArgs e)
    {
        if (e.Key != Key.Enter)
            return;

        // ADDED THIS TO SIMULATE AcceptsReturn = True
        if (initialsCheckBox.IsChecked == false)
        {
            AppendText(mainTextBox, Environment.NewLine, "#000000");
            return;
        }

        Chumhandle active = getActiveHandleBox().SelectedItem as Chumhandle;

        // ADDED Environment.NewLine TO INSERT LINE BREAKS
        AppendText(mainTextBox, Environment.NewLine + active.Initials + ": ", active.HexCode);

        // COMMENTED THIS BECAUSE IT WAS FORCING UNWANTED BEHAVIOR
        //TextPointer caretPos = mainTextBox.CaretPosition;
        //caretPos = caretPos.DocumentEnd;
        //mainTextBox.CaretPosition = caretPos;
    }

    public static void AppendText(RichTextBox box, string text, string color)
    {
        BrushConverter bc = new BrushConverter();

        // INSTEAD OF USING box.Document, I'VE USED box.Selection TO INSERT
        // THE TEXT WHEREVER THE CURSOR IS (OR IF YOU HAVE TEXT SELECTED)
        TextRange tr = new TextRange(box.Selection.Start, box.Selection.End);
        tr.Text = text;
        try
        {
            tr.ApplyPropertyValue(TextElement.ForegroundProperty, bc.ConvertFromString(color));
        }
        catch (FormatException) { }

        // I DON'T UNDERSTAND WHAT THIS IS DOING SO I KEPT IT -_^
        box.Selection.ApplyPropertyValue(RichTextBox.ForegroundProperty, bc.ConvertFromString(color));

        // FINALLY, I SET THE CARET TO THE END OF THE INSERTED TEXT
        box.CaretPosition = tr.End;
    }

阻止用户在生成的文本之前输入

Stop user from typing before generated text

c#

wpf

user-input

richtextbox