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POSilverlight /WPF: DependencyProperty.AddOwner & Render on change
 

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  1. POSilverlight /WPF: DependencyProperty.AddOwner & Render on change
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    <p>I need to implement a Ruler and I have a CustomControl RangeSlider which is derived from Control and has several DependencyProperties (e.g. Minimum, Maximum, LowerValue, UpperValue).</p> <pre><code>public static readonly DependencyProperty LowerValueProperty = DependencyProperty.Register("LowerValue", typeof(double), typeof(RangeSlider), new FrameworkPropertyMetadata(0d, OnLowerValueChanged, CoerceLowerValue)); public double LowerValue { get { return (double)base.GetValue(LowerValueProperty); } set { base.SetValue(LowerValueProperty, value); } } </code></pre> <p>In Xaml, the Ruler has a sub control Scale (derived from Canvas), which needs the same Properties to draw the Scaling. If LowerValue or UpperValue changed, the Scale should repaint. So I add </p> <pre><code>public static readonly DependencyProperty LowerValueProperty = RangeSlider.LowerValueProperty.AddOwner(typeof(Scale), new FrameworkPropertyMetadata(1d)); </code></pre> <p>When I move the thumb, something should raised in Scale. First I implemented OnRender(DrawingContext) and added to the LowerValueProperty in RangeSlider FrameworkPropertyMetadataOptions. But it doesn't matter, nothing happens. Moreover I do not want to use OnRender(DrawingContext), because it's not available in Silverlight.</p> <p>Furthermore I wonder why the OnLowerValueChanged-Method in RangeSlider is raised but not the setter of LowerValue (at least the debugger does not break in there).</p> <p>So, is there a way for Silverlight &amp; WPF to raise a method automatically in Scale, when LowerValue in RangeSlider changed (except raising from OnLowerValueChanged)?</p> <p>Note: The above code is the WPF-Code. In Silverlight there are of course some difference, because Silverlight does not support among other things Coercion.<br> Because the code should run in Silverlight and WPF, I do not want to use OnRender(DrawingContext).</p>
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    1. CORe Setters not firing: Binding to dependency properties is via SetValue() behind the scenes. The Setter/Getter is there as a helper for you (and I think also for use by the Xaml parser).
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