/// <summary>
/// Initialize new instance of ElasticTabstopsSizeManager for IWpfTextView
/// </summary>
private ElasticTabstopsSizeManager(IWpfTextView textView)
{
_textView = textView;
_textMeasureService = TextMeasureService.Create(_textView);
InvalidateTabstops();
}
private static TextMeasureService GetOrCreateProperty(IWpfTextView textView)
{
TextMeasureService tms = textView.Properties.GetOrCreateSingletonProperty(() => new TextMeasureService
{
_textView = textView,
_defaultTextRunProperties = textView.FormattedLineSource.DefaultTextProperties
});
return(tms);
}
public static TextMeasureService Create(IWpfTextView textView)
{
TextMeasureService tms = GetOrCreateProperty(textView);
//font was changed, refresh cache
if (tms._defaultTextRunProperties != textView.FormattedLineSource.DefaultTextProperties)
{
textView.Properties.RemoveProperty(typeof(TextMeasureService));
tms = GetOrCreateProperty(textView);
}
return(tms);
}