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Src/Xceed.Wpf.Toolkit/PropertyGrid/Implementation/TrimmedTextBlock.cs

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+/*************************************************************************************
+
+   Extended WPF Toolkit
+
+   Copyright (C) 2007-2013 Xceed Software Inc.
+
+   This program is provided to you under the terms of the Microsoft Public
+   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 
+
+   For more features, controls, and fast professional support,
+   pick up the Plus Edition at http://xceed.com/wpf_toolkit
+
+   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
+
+  ***********************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Xceed.Wpf.Toolkit.PropertyGrid
+{
+  public class TrimmedTextBlock : TextBlock
+  {
+    #region Constructor
+
+    public TrimmedTextBlock()
+    {
+      this.SizeChanged += this.TrimmedTextBlock_SizeChanged;
+    }
+
+    #endregion
+
+    #region IsTextTrimmed Property
+
+    public static readonly DependencyProperty IsTextTrimmedProperty = DependencyProperty.Register( "IsTextTrimmed", typeof( bool ), typeof( TrimmedTextBlock ), new PropertyMetadata( false, OnIsTextTrimmedChanged ) );
+    public bool IsTextTrimmed
+    {
+      get
+      {
+        return ( bool )GetValue( IsTextTrimmedProperty );
+      }
+      private set
+      {
+        SetValue( IsTextTrimmedProperty, value );
+      }
+    }
+
+    private static void OnIsTextTrimmedChanged( DependencyObject d, DependencyPropertyChangedEventArgs e )
+    {
+      var textBlock = d as TrimmedTextBlock;
+      if( textBlock != null )
+      {
+        textBlock.OnIsTextTrimmedChanged( ( bool )e.OldValue, ( bool )e.NewValue );
+      }
+    }
+
+    private void OnIsTextTrimmedChanged( bool oldValue, bool newValue )
+    {
+        this.ToolTip = ( newValue ) ? this.Text : null;
+    }
+
+    #endregion
+
+    #region Event Handler
+
+    private void TrimmedTextBlock_SizeChanged(object sender, SizeChangedEventArgs e)
+    {
+      var textBlock = sender as TextBlock;
+      if( textBlock != null )
+      {
+        this.IsTextTrimmed = this.GetIsTextTrimmed( textBlock );
+      }
+    }
+
+    #endregion
+
+    #region Private Methods
+
+    private bool GetIsTextTrimmed( TextBlock textBlock )
+    {
+      if( textBlock == null )
+        return false;
+      if( textBlock.TextTrimming == TextTrimming.None )
+        return false;
+      if( textBlock.TextWrapping != TextWrapping.NoWrap )
+        return false;
+
+      var textBlockActualWidth = textBlock.ActualWidth;
+      textBlock.Measure( new Size( double.MaxValue, double.MaxValue ) );
+      var textBlockDesiredWidth = textBlock.DesiredSize.Width;
+
+      return ( textBlockActualWidth < textBlockDesiredWidth );
+    }
+
+    #endregion
+  }
+}