WPF richtextbox的冲突语言设置

Question

在具有文化设置"de-DE"(或"en-US"以外的任何其他设备)的计算机上,我希望启用一个启用了拼写检查的RichTextBox,并将选中的语言设置为英语("en-US").

<RichTextBox SpellCheck.IsEnabled="True" Language="en-US"/>

这可以进行拼写检查,但会检查"de-DE"文化,而不是"en-US".添加时也一样xml:lang="en-us".

然而,

<RichTextBox SpellCheck.IsEnabled="True" InputLanguageManager.InputLanguage="en-US"/>

正确启用英语拼写检查,但也将键盘布局更改为"en-US".

如何使用系统的键盘设置(在我的情况下为"de-DE"),但RichTextBox的拼写检查是英语？

(可能相关:我正在使用.NET Framework 4.5)

Answer 1

我试图重现您的问题，对我来说，我无法激活英语以外的其他语言的拼写检查器，尽管我在初始化组件之前更改了区域设置和线程区域性：

    Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("de-DE");
    Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture("de-DE");

根据此处提供的解决方案，我能够使其工作：

1）继承自RichTextBox：

class RichTextBoxEx : RichTextBox
{
    protected override void OnTextChanged(TextChangedEventArgs e)
    {
        var changeList = e.Changes.ToList();
        if (changeList.Count > 0)
        {
            foreach (var change in changeList)
            {
                TextPointer start = null;
                TextPointer end = null;
                if (change.AddedLength > 0)
                {
                    start = this.Document.ContentStart.GetPositionAtOffset(change.Offset);
                    end = this.Document.ContentStart.GetPositionAtOffset(change.Offset + change.AddedLength);
                }
                else
                {
                    int startOffset = Math.Max(change.Offset - change.RemovedLength, 0);
                    start = this.Document.ContentStart.GetPositionAtOffset(startOffset);
                    end = this.Document.ContentStart.GetPositionAtOffset(change.Offset);
                }

                if (start != null && end != null)
                {
                    var range = new TextRange(start, end);
                    range.ApplyPropertyValue(FrameworkElement.LanguageProperty, Document.Language);
                }
            }
        }
        base.OnTextChanged(e);
    }
}

2）在你的xaml中使用它

<local:RichTextBoxEx x:Name="richTextBox" HorizontalAlignment="Left" Height="100" Margin="33,100,0,0" VerticalAlignment="Top" Width="474" 
             xml:lang="de-DE" SpellCheck.IsEnabled="True">

[编辑]

我还尝试通过定义计时器并时不时地检查所有内容的拼写来避免为每个文本更改应用属性值。在我的电脑上，使用最长的维基百科文章内容时我看不到差异：

class RichTextBoxEx : RichTextBox
{
    DispatcherTimer timer;
    bool textChanged = false;

    public RichTextBoxEx()
    {
        if (DesignerProperties.GetIsInDesignMode(this))
            return;

        timer = new DispatcherTimer();
        timer.Interval = new TimeSpan(0, 0, 1);
        timer.Tick += timer_Tick;
        timer.Start();
    }

    void timer_Tick(object sender, EventArgs e)
    {
        try
        {
            var range = new TextRange(Document.ContentStart, Document.ContentEnd);
            range.ApplyPropertyValue(FrameworkElement.LanguageProperty, Document.Language);
        }
        finally
        {
            textChanged = false;
        }
    }

    protected override void OnTextChanged(TextChangedEventArgs e)
    {
        // TODO: remove if timer version works correctly
        //var changeList = e.Changes.ToList();
        //if (changeList.Count > 0)
        //{
        //    foreach (var change in changeList)
        //    {
        //        TextPointer start = null;
        //        TextPointer end = null;
        //        if (change.AddedLength > 0)
        //        {
        //            start = this.Document.ContentStart.GetPositionAtOffset(change.Offset);
        //            end = this.Document.ContentStart.GetPositionAtOffset(change.Offset + change.AddedLength);
        //        }
        //        else
        //        {
        //            int startOffset = Math.Max(change.Offset - change.RemovedLength, 0);
        //            start = this.Document.ContentStart.GetPositionAtOffset(startOffset);
        //            end = this.Document.ContentStart.GetPositionAtOffset(change.Offset);
        //        }

        //        if (start != null && end != null)
        //        {
        //            var range = new TextRange(start, end);
        //            range.ApplyPropertyValue(FrameworkElement.LanguageProperty, Document.Language);
        //        }
        //    }
        //}

        textChanged = true;
        base.OnTextChanged(e);
    }
}