public static double[] GetCharWidths(this FormattedText formattedText, RichTextBlock richTextBlock, RuleText rule)
{
richTextBlock.ValidateDefaultRule(rule);
var text = formattedText.Text;
var result = new double[text.Length];
for (int i = 0; i < text.Length; i++)
{
var ft = new FormattedText(text[i].ToString(), CultureInfo.CurrentUICulture, richTextBlock.FlowDirection, new Typeface(rule.FontFamily, rule.FontStyle, rule.FontWeight, rule.FontStretch), rule.FontSize, rule.Foreground);
result[i] = ft.Width;
}
return(result);
}
public static FormattedText BuildFormattedText(this RichTextBlock richTextBlock, string value, RuleText currentRule = null)
{
if (currentRule == null)
{
currentRule = richTextBlock.BuildDefaultRule();
}
else
{
richTextBlock.ValidateDefaultRule(currentRule);
}
return(new FormattedText(value, CultureInfo.InvariantCulture,
richTextBlock.FlowDirection,
new Typeface(currentRule.FontFamily, currentRule.FontStyle,
currentRule.FontWeight, currentRule.FontStretch),
currentRule.FontSize, currentRule.Foreground));
}
public void SetUpRichTextHost(RichTextBlock block)
{
host = block;
var rulesSource = host.Rules;
RichText = host.Text;
if (ParserDic == null)
{
ParserDic = new Dictionary <RichTextRule, RichTextRuleParser>();
}
else
{
ParserDic.Clear();
}
foreach (var richTextRule in rulesSource)
{
var parser = new RichTextRuleParser(richTextRule);
ParserDic.Add(richTextRule, parser);
}
}
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()));
}
}
public static RuleText ValidateDefaultRule(this RichTextBlock richTextBlock, RuleText currentRule)
{
if (currentRule == null)
{
currentRule = new RuleText();
currentRule.IsUnMatched = true;
}
if (!currentRule.FontStyleSet)
{
currentRule.FontStyle = richTextBlock.FontStyle;
}
if (!currentRule.FontWeightSet)
{
currentRule.FontWeight = richTextBlock.FontWeight;
}
if (currentRule.FontFamily == null)
{
currentRule.FontFamily = richTextBlock.FontFamily;
}
if (!currentRule.FontStretchSet)
{
currentRule.FontStretch = richTextBlock.FontStretch;
}
if (currentRule.Background == null)
{
currentRule.Background = richTextBlock.Background;
}
if (currentRule.Foreground == null)
{
currentRule.Foreground = richTextBlock.Foreground;
}
if (!currentRule.FontSizeSet)
{
currentRule.FontSize = richTextBlock.FontSize;
}
return(currentRule);
}
public static RuleText BuildDefaultRule(this RichTextBlock richTextBlock)
{
return(richTextBlock.ValidateDefaultRule(null));
}
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);
}
}
}
