突出显示AvalonEdit所选单词的所有实例 [英] Highlight all occurrences of selected word in AvalonEdit

问题描述

我要突出AvalonEdit所选单词的所有实例。我创建HihglinghtingRule类的一个实例：

I need to highlight all occurrences of selected word in AvalonEdit. I created an instance of HihglinghtingRule class:

 var rule = new HighlightingRule()
   {
       Regex = regex, //some regex for finding occurences
       Color = new HighlightingColor {Background = new SimpleHighlightingBrush(Colors.Red)}
   };

我应该后做什么？
感谢。

What should I do after it ? Thanks.

推荐答案

要使用 HighlightingRule ，你必须创建高亮引擎的另一个实例（ HighlightingColorizer 等）

To use that HighlightingRule, you would have to create another instance of the highlighting engine (HighlightingColorizer etc.)

它更容易和更高效的编写一个 DocumentColorizingTransformer ，突出你的话：

It's easier and more efficient to write a DocumentColorizingTransformer that highlights your word:

public class ColorizeAvalonEdit : DocumentColorizingTransformer
{
    protected override void ColorizeLine(DocumentLine line)
    {
        int lineStartOffset = line.Offset;
        string text = CurrentContext.Document.GetText(line);
        int start = 0;
        int index;
        while ((index = text.IndexOf("AvalonEdit", start)) >= 0) {
            base.ChangeLinePart(
                lineStartOffset + index, // startOffset
                lineStartOffset + index + 10, // endOffset
                (VisualLineElement element) => {
                    // This lambda gets called once for every VisualLineElement
                    // between the specified offsets.
                    Typeface tf = element.TextRunProperties.Typeface;
                    // Replace the typeface with a modified version of
                    // the same typeface
                    element.TextRunProperties.SetTypeface(new Typeface(
                        tf.FontFamily,
                        FontStyles.Italic,
                        FontWeights.Bold,
                        tf.Stretch
                    ));
                });
            start = index + 1; // search for next occurrence
        }
    }
}

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