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## echopointng.model
Interface ExpansionModel

All Known Implementing Classes:
  DefaultExpansionModel

    public interface ExpansionModel

A model that supports at most one indexed selection.

Method Summary
`void` | `addChangeListener(ChangeListener listener)` Adds listener as a listener to changes in the model.
`boolean` | `isExpanded()` Returns the model's expansion.
`void` | `removeChangeListener(ChangeListener listener)` Removes listener as a listener to changes in the model.
`void` | `setExpanded(boolean isExpanded)` Sets the model's expansion Notifies any listeners if the model changes

Method Detail

### addChangeListener

    void addChangeListener(ChangeListener listener)

  Adds listener as a listener to changes in the model.

  Parameters:
    `listener` - the ChangeListener to add

### isExpanded

    boolean isExpanded()

  Returns the model's expansion.

### removeChangeListener

    void removeChangeListener(ChangeListener listener)

  Removes listener as a listener to changes in the model.

  Parameters:
    `listener` - the ChangeListener to remove

### setExpanded

    void setExpanded(boolean isExpanded)

  Sets the model's expansion
  Notifies any listeners if the model changes

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