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How to: Create a Custom Panel Element

Example

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: 
   ref class PlotPanel : Panel {

   public: 
      PlotPanel () {};

   protected: 
      // Override the default Measure method of Panel

      virtual Size MeasureOverride (Size availableSize) override 
      {
         Size childSize = availableSize;
         for each (UIElement^ child in InternalChildren)
         {
            child->Measure(childSize);
         }
         return availableSize;
      };

   protected: 
      virtual System::Windows::Size ArrangeOverride (Size finalSize) override 
      {
         for each (UIElement^ child in InternalChildren)
         {
            double x = 50;
            double y = 50;
            child->Arrange(Rect(Point(x, y), child->DesiredSize));
         }
         return finalSize;
      };
   };

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

See Also

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