XAML Unleashed

The Measure Step

In the measure step, parents ask their children how big they want to be, given the amount of space available. Panels (and children, when appropriate) do this by overriding the MeasureOverride method from FrameworkElement. Here’s an example:

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protected override Size MeasureOverride(Size availableSize){  ...  // Ask each child how big it would like to be, given a certain amount of space  foreach (UIElement child in this.Children)  {    child.Measure(new Size(...));    // The child's answer is now in child.DesiredSize    ...  }  ...  // Tell my parent how big I would like to be given the passed-in availableSize  return new Size(...);}

All children can be accessed via the panel’s Children collection (a ...