当 RichTextBox 刚加载/为空时，WPF EditingCommands 不起作用? [英] WPF EditingCommands is not working when RichTextBox is just load/empty?

问题描述

这是一个非常简单的代码示例:

Here is a very simple code example:

<DockPanel>
    <ToolBar DockPanel.Dock="Top" IsTabStop="False">
         <ToggleButton MinWidth="40"  Command="EditingCommands.ToggleBold" CommandTarget="{Binding ElementName=XAMLRichBox}" TextBlock.FontWeight="Bold" IsTabStop="False">B</ToggleButton>
    </ToolBar>
    <RichTextBox x:Name="XAMLRichBox" SpellCheck.IsEnabled="True" MinHeight="100"/>
</DockPanel>

当我运行它时，在 RichTextBox 中输入一些东西后，我可以使用 ToggleButton 来获得 BOLD 效果，一切都是美好的.

when I run it, after typing something into the RichTextBox, I can use the ToggleButton to get the BOLD effect, and everything is fine.

但是如果我在将任何内容输入到 RichTextBox 之前单击 ToggleButton(无论 RichTextBox 是否获得焦点)，尽管 ToggleButton 变成了 Checked，我的 RichTextBox 仍然使用正常样式(不是 BOLD)，直到我点击 ToggleButton再次.这是一个错误吗?我怎样才能四处走动?谢谢！

But if I click ToggleButton before typing in anything into RichTextBox (no matter RichTextBox get focus or not), although ToggleButton became Checked, my RichTextBox still using the normal style (not BOLD) until I click ToggleButton again. Is this a bug? how can I get around? Thanks!

推荐答案

我找到了一个半解决方案，我想我会分享，因为网络上的任何地方都没有回答这个问题，而且我认为很多人都遇到了这个问题.

I found a semi-solution and I thought I would share since this problem is not answered anywhere on the web and I think many people are having issues with it.

我在构造函数中设置了一个变量 NewInput.当 RichTextBox 中的第一个输入被触发时，我将应用我需要的所有格式并将其传递给控件.

I set a Variable NewInput in the constructor. When the first input in the richTextBox will be fired, I'll just apply every formating I need to it and pass it to the control.

private bool NewInput;
private void richTxt_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
    if (NewInput)
    {
        richTxt.BeginChange();
        TextPointer startPosition = richTxt.Selection.Start;
        Run r = new Run(e.Text, startPosition);
        if (IsSelectionBold)
        {
            r.FontWeight = FontWeights.Bold;
        }
        if (IsSelectionItalic)
        {
            r.FontStyle = FontStyles.Italic;
        }
        if (IsSelectionUnderlined)
        {
            r.TextDecorations = TextDecorations.Underline;
        }
        r.FontSize = double.Parse(SelectedFontHeight);
        r.FontFamily = new FontFamily(SelectedFont);

        richTxt.EndChange();


        NewInput = false;
        e.Handled = true;
        richTxt.CaretPosition = richTxt.CaretPosition.GetPositionAtOffset(1);
    }
}

然后我在正确的位置更换了carret.这样，即使 RichTextBox 中没有任何内容，格式也会保留.

I then replace the carret at the right place. Like this, the formating is kept even if there is nothing in the RichTextBox.

我相信有一天它会帮助某人.

I'm sure it'll help somebody one day.

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