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FrameworkElement.ArrangeOverride Method

When overridden in a derived class, positions child elements and determines a size for a FrameworkElement derived class.

Namespace:  System.Windows
Assembly:  PresentationFramework (in PresentationFramework.dll)

'Declaration
Protected Overridable Function ArrangeOverride ( _
	finalSize As Size _
) As Size

Parameters

finalSize
Type: System.Windows.Size
The final area within the parent that this element should use to arrange itself and its children.

Return Value

Type: System.Windows.Size
The actual size used.

Notes to Inheritors

Control authors who want to customize the arrange pass of layout processing should override this method. The implementation pattern should call Arrange on each visible child element, and pass the final desired size for each child element as the finalRect parameter. Parent elements should call Arrange on each child, otherwise the child elements will not be rendered.

Many derived classes offer implementations of this method. Prominent ones include: Window.ArrangeOverride, Page.ArrangeOverride and Control.ArrangeOverride.

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 Size = New Size()
        ' In our example, we just have one child. 
        ' Report that our panel requires just the size of its only child.
        For Each child As UIElement In InternalChildren
            child.Measure(availableSize)
            panelDesiredSize = child.DesiredSize
        Next
        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))
        Next
        Return finalSize
    End Function
End Class


.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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