# Package org.eclipse.gef.zest.fx.policies

This package provides policy implementations to support hiding/unhiding of nodes and related edges ( `HidePolicy`, `ShowHiddenNeighborsPolicy`), as well as semantic zooming ( `SemanticZoomPolicy`), and label transformation.

Class Summary
HidePolicy: The `HidePolicy` can be installed on `NodePart` to hide the contents.
SemanticZoomPolicy: The `SemanticZoomPolicy` extends the `ViewportPolicy` for associating semantic changes with viewport changes, i.e. opening of nested/nesting graphs when the zoom level is changed below/above a certain threshold.
ShowHiddenNeighborsPolicy: The `ShowHiddenNeighborsPolicy` can be installed on `NodePart` to show its hidden neighbours
TransformLabelPolicy: The `TransformLabelPolicy` is a specialization of the `TransformPolicy` that chains a `ChangeAttributeOperation` to affect the underlying model when transforming nodes.