Package dk.gtz.graphedit.util

Class VetoChangeListener<T>

java.lang.Object
dk.gtz.graphedit.util.VetoChangeListener<T>
Type Parameters:
T - The type of the wrapped value
All Implemented Interfaces:
javafx.beans.value.ChangeListener<T>
public abstract class VetoChangeListener<T> extends Object implements javafx.beans.value.ChangeListener<T>
Change listener that can veto a change if it was not a valid change.

  • Constructor Summary

    Constructors
    Constructor
    Description
    VetoChangeListener(javafx.scene.control.SelectionModel<T> selectionModel)
    Construct a new instance

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    changed(javafx.beans.value.ObservableValue<? extends T> observable, T oldValue, T newValue)
     
    protected abstract boolean
    isInvalidChange(T oldValue, T newValue)
    Checks if the change was a valid one or not.
    protected abstract void
    onChanged(T oldValue, T newValue)
    Callback for when the change was valid and accepted.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • VetoChangeListener

      public VetoChangeListener(javafx.scene.control.SelectionModel<T> selectionModel)
      Construct a new instance
      Parameters:
      selectionModel - The selection to listen for changes in

  • Method Details

    • changed

      public void changed(javafx.beans.value.ObservableValue<? extends T> observable, T oldValue, T newValue)
      Specified by:
      changed in interface javafx.beans.value.ChangeListener<T>

    • isInvalidChange

      protected abstract boolean isInvalidChange(T oldValue, T newValue)
      Checks if the change was a valid one or not. If the change is invalid, the selection will be reverted
      Parameters:
      oldValue - The old value
      newValue - The new value
      Returns:
      true if the change was considered valid, false otherwise

    • onChanged

      protected abstract void onChanged(T oldValue, T newValue)
      Callback for when the change was valid and accepted.
      Parameters:
      oldValue - The old value
      newValue - The new value