#1,170 – Custom Panel, part II (Simple Arrangement of Child Elements)

You create a class that derives from Panel in order to create a panel control with custom behavior.  Below, we expand on the earlier example to create a simple panel that stacks its child elements vertically, stretching them to fit the available space.

Here’s what happens:

  • In the Measure phase, we tell each element how big it should be, dividing the vertical space by the # child elements
  • In the Arrange phase, we position the elements
    public class MyPanel : Panel
    {
        protected override Size MeasureOverride(Size availableSize)
        {
            Size childSize = new Size(availableSize.Width, availableSize.Height / InternalChildren.Count);

            foreach (UIElement elem in InternalChildren)
                elem.Measure(childSize);

            return availableSize;
        }

        protected override Size ArrangeOverride(Size finalSize)
        {
            double childHeight = finalSize.Height / InternalChildren.Count;
            Size childSize = new Size(finalSize.Width, childHeight);

            double top = 0.0;
            for (int i = 0; i < InternalChildren.Count; i++)
            {
                Rect r = new Rect(new Point(0.0, top), childSize);
                InternalChildren[i].Arrange(r);
                top += childHeight;
            }

            return finalSize;
        }
    }

1170-001

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #1,170 – Custom Panel, part II (Simple Arrangement of Child Elements)

  1. Pingback: Dew Drop – October 1, 2014 (#1867) | Morning Dew

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