public void FormatBlock(RichTextBlock richTextBlock)
{
var text = richTextBlock.Text;
if (string.IsNullOrEmpty(text))
{
return;
}
if (richTextBlock.Rules.Any())
{
FormatCache.Clear();
FormatterImpl.SetUpRichTextHost(richTextBlock);
BuildFormatText(richTextBlock, FormatterImpl.Format());
}
else
{
var formatText = richTextBlock.BuildFormattedText(text);
FormatCache.Add(new TextFormatCache(formatText, new Point()));
}
}
private void BuildFormatText(RichTextBlock richTextBlock, List <RuleText> tempRules)
{
var offset = new Point(0, 0);
foreach (var tempRule in tempRules)
{
var formatText = richTextBlock.BuildFormattedText(tempRule.Value, tempRule);
var ftext = formatText.Text;
if (offset.X + formatText.Width > richTextBlock.ActualWidth)
{
if (richTextBlock.AutoWrap)
{
while (offset.X + formatText.Width > richTextBlock.ActualWidth)
{
var eachWidths = formatText.GetCharWidths(richTextBlock, tempRule).ToArray();
double width = 0;
var needRemoveCount = eachWidths.Length;
do
{
needRemoveCount--;
width = eachWidths.Take(needRemoveCount).Sum();
if (needRemoveCount < 0)
{
break;
}
} while (offset.X + width > richTextBlock.ActualWidth);
var renderText = ftext.Substring(0, needRemoveCount);
formatText = richTextBlock.BuildFormattedText(renderText, tempRule);
FormatCache.Add(new TextFormatCache(formatText, offset));
offset.Offset(formatText.Width, 0);
formatText = null;
ftext = ftext.Substring(needRemoveCount, ftext.Length - needRemoveCount);
if (string.IsNullOrEmpty(ftext))
{
break;
}
formatText = richTextBlock.BuildFormattedText(ftext, tempRule);
offset.Offset(-offset.X, formatText.Height);
}
if (formatText != null)
{
FormatCache.Add(new TextFormatCache(formatText, offset));
offset.Offset(formatText.Width, 0);
}
}
else
{
offset.Offset(-offset.X, formatText.Height);
FormatCache.Add(new TextFormatCache(formatText, offset));
offset.Offset(formatText.Width, 0);
}
}
else
{
FormatCache.Add(new TextFormatCache(formatText, offset));
offset.Offset(formatText.Width, 0);
}
}
}