Bi-directional coupling. The ViewportWidget's axis will be equal to its child's axis. Use this if the axis being tied isn't meant to be scrollable.
Uni-directional coupling, from the child to the parent. The child's resolved axis length will be used as the ViewportWidget's minimum axis length. Useful when combined with Widget#flexShrink.
Default axis coupling mode for TextArea.
Doesn't couple a ViewportWidget's axis to its child; the viewport's axis length is completely separate from the child's axis length.
Default axis coupling mode for ViewportWidget.
Uni-directional coupling, from the parent to the child. The ViewportWidget's axis will be resolved as a regular Widget, but the result will be transferred to the child's minimum axis length constraint.
Default axis coupling mode for TextArea.
An axis coupling mode is a mode that is applied to a ViewportWidget on a per-axis basis. The mode controls how a ViewportWidget's axis length relates to a ViewportWidget child's axis length.
If two axes are not coupled, then they do not affect each other's length in any way. If two axes are bi-directionally coupled, then they will always have the same length. If two axes are uni-directionally coupled, then one axis will affect the length of another axis, but not the other way around.