/// <summary> /// 将 HighlightText 依赖项属性的值设置为指定元素。 /// </summary> /// <param name="obj">对其设置属性值的元素。</param> /// <param name="value">要设置的值。</param> public static void SetHighlightText(TextBlock textBlock, TextBlockHighlightSource value) => textBlock.SetValue(HighlightTextProperty, value);
private static void MarkHighlight(TextBlock target, TextBlockHighlightSource highlightSource)
{
var text = target.Text;
target.Inlines.Clear();
if (string.IsNullOrWhiteSpace(text))
{
return;
}
if (string.IsNullOrWhiteSpace(highlightSource.Text))
{
target.Inlines.Add(new Run {
Text = text
});
return;
}
while (text.Length > 0)
{
var runText = string.Empty;
var index = text.IndexOf(highlightSource.Text, StringComparison.InvariantCultureIgnoreCase);
if (index > 0)
{
runText = text.Substring(0, index);
var run = new Run
{
Text = runText,
};
if (highlightSource.LowlightForeground != null)
{
run.Foreground = highlightSource.LowlightForeground;
}
target.Inlines.Add(run);
}
else if (index == 0)
{
runText = text.Substring(0, highlightSource.Text.Length);
var run = new Run {
Text = runText
};
if (highlightSource.HighlightForeground != null)
{
run.Foreground = highlightSource.HighlightForeground;
}
if (highlightSource.HighlightBackground != null)
{
run.Background = highlightSource.HighlightBackground;
}
target.Inlines.Add(run);
}
else if (index == -1)
{
runText = text;
var run = new Run
{
Text = runText,
};
if (highlightSource.LowlightForeground != null)
{
run.Foreground = highlightSource.LowlightForeground;
}
target.Inlines.Add(run);
}
text = text.Substring(runText.Length);
}
}