private static void OnEllipsisPositionChanged(TextBlock textBlock, EllipsisPosition ellipsisPosition)
{
var data = TextBlockTrimming.GetData(textBlock);
data.EllipsisPosition = ellipsisPosition;
TextBlockTrimming.TrimText(textBlock);
}
private static void TextBlock_TextChanged(object sender, EventArgs e)
{
var textBlock = (TextBlock)sender;
var data = TextBlockTrimming.GetData(textBlock);
data.OriginalText = textBlock.Text;
TextBlockTrimming.TrimText(textBlock);
}
private static void OnEllipsisPositionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var textBlock = d as TextBlock;
if (textBlock == null)
{
return;
}
var ellipsisPosition = (EllipsisPosition)e.NewValue;
TextBlockTrimming.OnEllipsisPositionChanged(textBlock, ellipsisPosition);
}
private static void TextBlock_SizeChanged(object sender, SizeChangedEventArgs e)
{
TextBlockTrimming.TrimText((TextBlock)sender);
}
private static void TrimText(TextBlock textBlock)
{
if (DesignerProperties.GetIsInDesignMode(textBlock))
{
return;
}
if (textBlock.TextTrimming != TextTrimming.CharacterEllipsis || textBlock.TextWrapping != TextWrapping.NoWrap)
{
return;
}
// ReSharper disable once CompareOfFloatsByEqualityOperator
if (textBlock.ActualWidth == 0)
{
return;
}
using (TextBlockTrimming.BlockTextChangedEvent(textBlock))
{
var data = TextBlockTrimming.GetData(textBlock);
// this actually sets textBlock's text back to its original value
var desiredSize = textBlock.MeasureString(data.OriginalText);
if (desiredSize <= textBlock.ActualWidth)
{
return;
}
var ellipsisSize = textBlock.MeasureString(ELLIPSIS);
var freeSize = textBlock.ActualWidth - ellipsisSize;
var segments = new List <string>();
var epsilon = ellipsisSize / 3;
var builder = new StringBuilder();
var text = data.OriginalText;
switch (data.EllipsisPosition)
{
case EllipsisPosition.End:
TextBlockTrimming.TrimText(textBlock, text, freeSize, segments, epsilon, false);
foreach (var segment in segments)
{
builder.Append(segment);
}
builder.Append(ELLIPSIS);
break;
case EllipsisPosition.Start:
TextBlockTrimming.TrimText(textBlock, text, freeSize, segments, epsilon, true);
builder.Append(ELLIPSIS);
foreach (var segment in ((IEnumerable <string>)segments).Reverse())
{
builder.Append(segment);
}
break;
case EllipsisPosition.Middle:
var textLength = text.Length / 2;
var firstHalf = text.Substring(0, textLength);
var secondHalf = text.Substring(textLength);
freeSize /= 2;
TextBlockTrimming.TrimText(textBlock, firstHalf, freeSize, segments, epsilon, false);
foreach (var segment in segments)
{
builder.Append(segment);
}
builder.Append(ELLIPSIS);
segments.Clear();
TextBlockTrimming.TrimText(textBlock, secondHalf, freeSize, segments, epsilon, true);
foreach (var segment in ((IEnumerable <string>)segments).Reverse())
{
builder.Append(segment);
}
break;
default:
throw new NotSupportedException();
}
textBlock.Text = builder.ToString();
}
}
