public static string ProcessTrimming(Control control, string text, double availableWidth)
{
TextTrimming trimming = GetTextTrimming(control);
TrimmingSource source = GetTrimmingSource(control);
string wordSeparators = GetWordSeparators(control);
return(ProcessTrimming(control, text, availableWidth, trimming, source, wordSeparators));
}
/// <summary>
/// Sets the value of the <see cref="TrimmingSource"/> dependency property attached to the given <see cref="DependencyObject"/>.
/// </summary>
/// <param name="target">The target <see cref="DependencyObject"/>.</param>
/// <param name="value">The value to set.</param>
public static void SetTrimmingSource([NotNull] DependencyObject target, TrimmingSource value)
{
target.SetValue(TrimmingSourceProperty, value);
}
private static string ProcessTrimming(string text, [NotNull] Typeface typeface, double fontSize, TextTrimming trimming, TrimmingSource source, string wordSeparators, double availableWidth)
{
if (trimming == TextTrimming.None)
{
return(text);
}
var textWidth = GetTextWidth(text, trimming, typeface, fontSize, wordSeparators, out double[] sizes);
if (availableWidth >= textWidth)
{
return(text);
}
if (sizes.Length == 0)
{
return(text);
}
List <string> words;
switch (trimming)
{
case TextTrimming.CharacterEllipsis:
words = text.ToCharArray().Select(c => c.ToString(CultureInfo.InvariantCulture)).ToList();
break;
case TextTrimming.WordEllipsis:
words = SplitWords(text, wordSeparators);
break;
default:
throw new ArgumentException("Invalid 'TextTrimming' argument.");
}
var firstWord = true;
switch (source)
{
case TrimmingSource.Begin:
{
var currentWidth = GetTextWidth(Ellipsis, trimming, typeface, fontSize, wordSeparators, out _);
var ending = new StringBuilder();
for (var i = words.Count - 1; i >= 0; --i)
{
var test = currentWidth + sizes[i];
if (test > availableWidth)
{
// If there's not enough room for a single word, fall back on character trimming from the beginning
if (trimming == TextTrimming.WordEllipsis && firstWord)
{
return(ProcessTrimming(words[i], typeface, fontSize, TextTrimming.CharacterEllipsis, TrimmingSource.Begin, wordSeparators, availableWidth));
}
break;
}
ending.Insert(0, words[i]);
currentWidth = test;
firstWord = false;
}
return($"{Ellipsis}{ending}");
}
case TrimmingSource.Middle:
{
var currentWidth = GetTextWidth(Ellipsis, trimming, typeface, fontSize, wordSeparators, out _);
var begin = new StringBuilder();
var ending = new StringBuilder();
for (int i = 0, j = words.Count - 1; i <= j; ++i, --j)
{
var test = currentWidth + sizes[i] + (i != j ? sizes[j] : 0);
if (test > availableWidth)
{
// If there's not enough room for a single word, fall back on character trimming from the end
if (trimming == TextTrimming.WordEllipsis && firstWord)
{
return(ProcessTrimming(words[j], typeface, fontSize, TextTrimming.CharacterEllipsis, TrimmingSource.End, wordSeparators, availableWidth));
}
break;
}
begin.Append(words[i]);
if (i != j)
{
ending.Insert(0, words[j]);
}
currentWidth = test;
firstWord = false;
}
return(string.Format("{0}{2}{1}", begin, ending, Ellipsis));
}
case TrimmingSource.End:
{
var currentWidth = GetTextWidth(Ellipsis, trimming, typeface, fontSize, wordSeparators, out _);
var begin = new StringBuilder();
for (var i = 0; i < words.Count; ++i)
{
var test = currentWidth + sizes[i];
if (test > availableWidth)
{
// If there's not enough room for a single word, fall back on character trimming from the end
if (trimming == TextTrimming.WordEllipsis && firstWord)
{
return(ProcessTrimming(words[i], typeface, fontSize, TextTrimming.CharacterEllipsis, TrimmingSource.Begin, wordSeparators, availableWidth));
}
break;
}
begin.Append(words[i]);
currentWidth = test;
firstWord = false;
}
return($"{begin}{Ellipsis}");
}
default:
throw new ArgumentOutOfRangeException();
}
}
public static string ProcessTrimming([NotNull] TextBlock textBlock, string text, TextTrimming trimming, TrimmingSource source, string wordSeparators, double availableWidth)
{
var typeface = new Typeface(textBlock.FontFamily, textBlock.FontStyle, textBlock.FontWeight, textBlock.FontStretch);
return(ProcessTrimming(text, typeface, textBlock.FontSize, trimming, source, wordSeparators, availableWidth));
}
/// <summary>
/// Sets the value of the <see cref="TrimmingSource"/> dependency property attached to the given <see cref="DependencyObject"/>.
/// </summary>
/// <param name="target">The target <see cref="DependencyObject"/>.</param>
/// <param name="value">The value to set.</param>
public static void SetTrimmingSource(DependencyObject target, TrimmingSource value)
{
target.SetValue(TrimmingSourceProperty, value);
}
private static string ProcessTrimming(Control control, string text, double availableWidth, TextTrimming trimming, TrimmingSource source, string wordSeparators)
{
if (trimming == TextTrimming.None)
{
return text;
}
double[] sizes;
var textWidth = GetTextWidth(control, text, trimming, out sizes);
if (availableWidth >= textWidth)
{
return text;
}
if (sizes.Length == 0)
{
return text;
}
List<string> words;
switch (trimming)
{
case TextTrimming.CharacterEllipsis:
words = text.ToCharArray().Select(c => c.ToString(CultureInfo.InvariantCulture)).ToList();
break;
case TextTrimming.WordEllipsis:
words = SplitWords(text, wordSeparators);
break;
default:
throw new ArgumentException("Invalid 'TextTrimming' argument.");
}
bool firstWord = true;
switch (source)
{
case TrimmingSource.Begin:
{
var currentWidth = GetTextWidth(control, Ellipsis, trimming);
var ending = new StringBuilder();
for (int i = words.Count - 1; i >= 0; --i)
{
var test = currentWidth + sizes[i];
if (test > availableWidth)
{
// If there's not enough room for a single word, fall back on character trimming from the beginning
if (trimming == TextTrimming.WordEllipsis && firstWord)
{
return ProcessTrimming(control, words[i], availableWidth, TextTrimming.CharacterEllipsis, TrimmingSource.Begin, wordSeparators);
}
break;
}
ending.Insert(0, words[i]);
currentWidth = test;
firstWord = false;
}
return string.Format("{0}{1}", Ellipsis, ending);
}
case TrimmingSource.Middle:
{
var currentWidth = GetTextWidth(control, Ellipsis, trimming);
var begin = new StringBuilder();
var ending = new StringBuilder();
for (int i = 0, j = words.Count - 1; i <= j; ++i, --j)
{
var test = currentWidth + sizes[i] + (i != j ? sizes[j] : 0);
if (test > availableWidth)
{
// If there's not enough room for a single word, fall back on character trimming from the end
if (trimming == TextTrimming.WordEllipsis && firstWord)
{
return ProcessTrimming(control, words[j], availableWidth, TextTrimming.CharacterEllipsis, TrimmingSource.End, wordSeparators);
}
break;
}
begin.Append(words[i]);
if (i != j)
ending.Insert(0, words[j]);
currentWidth = test;
firstWord = false;
}
return string.Format("{0}{2}{1}", begin, ending, Ellipsis);
}
case TrimmingSource.End:
{
var currentWidth = GetTextWidth(control, Ellipsis, trimming);
var begin = new StringBuilder();
for (int i = 0; i < words.Count; ++i)
{
var test = currentWidth + sizes[i];
if (test > availableWidth)
{
// If there's not enough room for a single word, fall back on character trimming from the end
if (trimming == TextTrimming.WordEllipsis && firstWord)
{
return ProcessTrimming(control, words[i], availableWidth, TextTrimming.CharacterEllipsis, TrimmingSource.Begin, wordSeparators);
}
break;
}
begin.Append(words[i]);
currentWidth = test;
firstWord = false;
}
return string.Format("{0}{1}", begin, Ellipsis);
}
default:
throw new ArgumentOutOfRangeException();
}
}
