wpf textblock超出显示范围后显示tooltip
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原文:wpf textblock超出显示范围后显示tooltip
public static class TextTrmmingShowToolTip { public static readonly DependencyProperty IsToolTipProperty = DependencyProperty.RegisterAttached( "IsToolTip", typeof(bool), typeof(TextTrmmingShowToolTip), new PropertyMetadata(default(bool), TextPropertyChangedCallback)); public static void SetIsToolTip(DependencyObject element, bool value) { element.SetValue(IsToolTipProperty, value); } public static bool GetIsToolTip(DependencyObject element) { return (bool) element.GetValue(IsToolTipProperty); } private static void TextPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e) { var tb = d as TextBlock; if (tb == null) return; tb.SizeChanged -= TbOnSizeChanged; if (!(bool) e.NewValue) return; tb.SizeChanged += TbOnSizeChanged; } private static void TbOnSizeChanged(object sender, SizeChangedEventArgs e) { var tb = sender as TextBlock; if (tb == null) return; SetToolTip(tb); } private static void SetToolTip(TextBlock tb) { if (string.IsNullOrEmpty(tb.Text)) { tb.ToolTip = null; return; } var isTrim = IsTextTrimmed(tb); tb.ToolTip = isTrim ? tb.Text : null; } private static bool IsTextTrimmed(TextBlock textBlock) { Typeface typeface = new Typeface( textBlock.FontFamily, textBlock.FontStyle, textBlock.FontWeight, textBlock.FontStretch); FormattedText formattedText = new FormattedText( textBlock.Text, System.Threading.Thread.CurrentThread.CurrentCulture, textBlock.FlowDirection, typeface, textBlock.FontSize, textBlock.Foreground); bool isTrimmed = formattedText.Width >= textBlock.ActualWidth; return isTrimmed; } }
使用的时候这样调用:
<TextBlock
Text="{Binding Name}"
converter:TextTrmmingShowToolTip.IsToolTip="True" />
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