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FrameworkElement.ArrangeOverride, méthode

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

Espace de noms: System.Windows
Assembly : PresentationFramework (dans presentationframework.dll)

protected virtual Size ArrangeOverride (
	Size finalSize
)
protected Size ArrangeOverride (
	Size finalSize
)
protected function ArrangeOverride (
	finalSize : Size
) : Size
Vous ne pouvez pas utiliser des méthodes dans XAML.

Paramètres

finalSize

The final area within the parent that this element should use to arrange itself and its children.

Valeur de retour

The actual size used.

Remarques à l'attention des héritiers : 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 : Panel
{
    // Default public constructor
    public PlotPanel()
        : base()
    {
    }

    // Override the default Measure method of Panel
    protected override Size MeasureOverride(Size availableSize)
    {
        Size childSize = availableSize;
        foreach (UIElement child in InternalChildren)
        {
            child.Measure(childSize);
        }
        return availableSize;
    }
    protected override Size ArrangeOverride(Size finalSize)
    {
        foreach (UIElement child in InternalChildren)
        {
            double x = 50;
            double y = 50;

            child.Arrange(new Rect(new Point(x, y), child.DesiredSize));
        }
        return finalSize; // Returns the final Arranged size
    }
}

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

Microsoft .NET Framework 3.0 est pris en charge sur Windows Vista, Microsoft Windows XP SP2 et Windows Server 2003 SP1.

.NET Framework

Prise en charge dans : 3.0

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