#1,167 – Layout in Action, part IV

The previous example showed how layout works when a child element needs less space than what it is available.  Below, we walk through the case when the child needs more space than what’s available.

Assume that we have a Label with more content than will fit into a containing StackPanel (which sizes to fit a containing window).  At run-time, the measure/arrange process is:

  • StackPanel calls Measure on the label, passing in its own width as a constraint width and infinity as a constraint height.
  • Label can’t fit into specified constraint width, so it returns a size from MeasureOverride with width equal to constraint width (it takes what it can get) and height to fit its desired height
  • StackPanel gives the label this requested height and width
  • StackPanel calls Arrange on MyLabel, which uses specified size to render label

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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.

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