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POAdd Label in the middle of the line
 

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    <p>i created a custom control which represents an edge of a graph. In the middle of the is the weight displayed.</p> <p><img src="https://i.stack.imgur.com/lFLZH.jpg" alt="enter image description here"> (Circules are vertices and the connecting line are the edges)</p> <p>I made this by drawing the weight with the overriden OnRender method. But this isn't a nice solution.</p> <p>There is no way to make the the weight editable for example by a textbox. So it would be great if I could add a TextBox or a ContentPresenter to the overriden OnRender method in order to make the weight editable. But I dont' know how to do this.</p> <p>Anyway, this is my current state:</p> <pre><code> &lt;Style TargetType="{x:Type local:Edge}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type local:Edge}"&gt; &lt;DockPanel&gt; &lt;Line Stroke="{TemplateBinding Foreground}" X1="{Binding Mode=TwoWay,Path=PositionU.X,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type local:Edge}}}" Y1="{Binding Mode=TwoWay,Path=PositionU.Y,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type local:Edge}}}" X2="{Binding Mode=TwoWay,Path=PositionV.X,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type local:Edge}}}" Y2="{Binding Mode=TwoWay,Path=PositionV.Y,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type local:Edge}}}" &gt; &lt;/Line&gt; &lt;/DockPanel&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <p>CODEBehind for the control:</p> <pre><code> public class Edge : Control { static Edge() { DefaultStyleKeyProperty.OverrideMetadata(typeof(Edge), new FrameworkPropertyMetadata(typeof(Edge))); } protected override void OnRender(DrawingContext drawingContext) { base.OnRender(drawingContext); Point p = new Point((PositionV.X + PositionU.X) / 2 + 4, (PositionV.Y + PositionU.Y) / 2); drawingContext.DrawText(new FormattedText(Weight != null ? Weight.ToString() : "", System.Globalization.CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface(this.FontFamily.ToString()), this.FontSize, this.Foreground), p); } public int Weight { get { return (int)GetValue(WeightProperty); } set { SetValue(WeightProperty, value); } } // Using a DependencyProperty as the backing store for Weight. This enables animation, styling, binding, etc... public static readonly DependencyProperty WeightProperty = DependencyProperty.Register("Weight", typeof(int), typeof(Edge), new UIPropertyMetadata(0)); /// &lt;summary&gt; /// Gets or sets the value of the position from the correspondending U Vertex control /// &lt;/summary&gt; public Point PositionU { get { return (Point)GetValue(PositionUProperty); } set { SetValue(PositionUProperty, value); } } // Using a DependencyProperty as the backing store for PositionU. This enables animation, styling, binding, etc... public static readonly DependencyProperty PositionUProperty = DependencyProperty.Register("PositionU", typeof(Point), typeof(Edge), new UIPropertyMetadata(new Point())); /// &lt;summary&gt; /// Gets or sets the value of the position from the correspondending V Vertex control /// &lt;/summary&gt; public Point PositionV { get { return (Point)GetValue(PositionVProperty); } set { SetValue(PositionVProperty, value); } } // Using a DependencyProperty as the backing store for PositionV. This enables animation, styling, binding, etc... public static readonly DependencyProperty PositionVProperty = DependencyProperty.Register("PositionV", typeof(Point), typeof(Edge), new UIPropertyMetadata(null)); } </code></pre> <p>How can I display the weight with a TextBlock/TextBox in the middle of the line?</p>
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    1. CODon't override `OnRender()` in WPF. This is not winforms. Why don't you just add the desired UI elements in the ControlTemplate?
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    2. COI don't know how to add the UI Element beside the line. Also the UI Element should be placed horizontal at half of the line.
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