How to: Create a Custom Panel Element

How to: Create a Custom Panel Element

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
    Inherits Panel
    'Override the default Measure method of Panel. 

    Protected Overrides Function MeasureOverride(ByVal availableSize As System.Windows.Size) As System.Windows.Size

        Dim panelDesiredSize As New Size()

        For Each child As UIElement In InternalChildren
            panelDesiredSize = child.DesiredSize

        Return panelDesiredSize

    End Function 
    Protected Overrides Function ArrangeOverride(ByVal finalSize As System.Windows.Size) As System.Windows.Size
        For Each child As UIElement In InternalChildren
            Dim x As Double = 50
            Dim y As Double = 50
            child.Arrange(New Rect(New System.Windows.Point(x, y), child.DesiredSize))
        Return finalSize
    End Function 
End Class

For the complete sample, see Create a Simple Custom Panel Sample.

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