Demonstrates how to use ExplicitLayout to:
- Control the layout behaviour when a component is invisible
This example demonstrates the use of the widthZeroIfInvisible and
heightZeroIfInvisible flags of an ExplicitConstraints object.
These flags control whether the width and height of a component is
set to zero when the component is invisible.
The container has buttons labelled 'One' to 'Six' and some check boxes
that allow you to change the visibility of some of the components. All buttons except
'Five' have both the widthZeroIfInvisible=true and heightZeroIfInvisible=true.
Button five has its widthZeroIfInvisible=false. See source code for details
of layout.
Notice the following behaviour (when running Demonstration Application):
- 'Three' moves left when 'Two' is set invisible. This is because the width of
'Two' is set to zero when it is invisible.
- 'Six' does not move when 'Five' is set invisible. This is because the width of
'Five' is unchanged when it is invisible.
For more sophisticated behaviour when components are made invisible, it is possible
to modify the constraints at runtime (see Ratio Trigger example)
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