Create a Custom Panel

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This example shows how to override the default layout behavior of the Panel element and create custom layout elements that are derived from Panel.
The example defines a simple custom Panel element called PlotPanel, which positions child elements according to two hard-coded x- and y-coordinates. In this example, x and y are both set to 50; therefore, all child elements are positioned at that location on the x and y axes.
To implement custom Panel behaviors, the example uses the MeasureOverride and ArrangeOverride methods. Each method returns the Size data that is necessary to position and render child elements.
public class PlotPanel : Panel
{
    // Override the default Measure method of Panel
    protected override Size MeasureOverride(Size availableSize)
    {
        var panelDesiredSize = new Size();
​
        // In our example, we just have one child. 
        // Report that our panel requires just the size of its only child.
        foreach (var child in Children)
        {
            child.Measure(availableSize);
            panelDesiredSize = child.DesiredSize;
        }
​
        return panelDesiredSize;
    }
​
    protected override Size ArrangeOverride(Size finalSize)
    {
        foreach (var child in Children)
        {
            double x = 50;
            double y = 50;
​
            child.Arrange(new Rect(new Point(x, y), child.DesiredSize));
        }
        
        return finalSize; // Returns the final Arranged size
    }
}

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