How to use

TreeExpansionEvent

in

org.eclipse.jface.viewers

  @Override
  public void treeExpanded(TreeExpansionEvent event) {
    expandTreeElement(event.getElement());
  }
}

/**
 * Handles a tree collapse event from the SWT widget.
 *
 * @param event
 *            the SWT tree event
 */
protected void handleTreeCollapse(TreeEvent event) {
  if (event.item.getData() != null) {
    fireTreeCollapsed(new TreeExpansionEvent(this, event.item.getData()));
  }
}

/**
 * Handles a tree collapse event from the SWT widget.
 *
 * @param event
 *            the SWT tree event
 */
protected void handleTreeCollapse(TreeEvent event) {
  if (event.item.getData() != null) {
    fireTreeCollapsed(new TreeExpansionEvent(this, event.item.getData()));
  }
}

  @Override
  public void treeExpanded(TreeExpansionEvent event) {
    autoExpand(viewer, event.getElement());
  }
});

/**
 * Handles a tree collapse event from the SWT widget.
 *
 * @param event
 *            the SWT tree event
 */
protected void handleTreeCollapse(TreeEvent event) {
  if (event.item.getData() != null) {
    fireTreeCollapsed(new TreeExpansionEvent(this, event.item.getData()));
  }
}

  public void treeExpanded(TreeExpansionEvent event) {
    Widget item = findItem(event.getElement());
    if (item instanceof TreeItem) {
      initializeItem((TreeItem) item);
    }
  }
});

/**
 * Handles a tree expand event from the SWT widget.
 *
 * @param event
 *            the SWT tree event
 */
protected void handleTreeExpand(TreeEvent event) {
  createChildren(event.item);
  if (event.item.getData() != null) {
    fireTreeExpanded(new TreeExpansionEvent(this, event.item.getData()));
  }
}

  @Override
  public void treeExpanded(TreeExpansionEvent event) {
    Widget item = findItem(event.getElement());
    if (item instanceof TreeItem) {
      initializeItem((TreeItem) item);
    }
  }
});

/**
 * Handles a tree expand event from the SWT widget.
 *
 * @param event
 *            the SWT tree event
 */
protected void handleTreeExpand(TreeEvent event) {
  createChildren(event.item);
  if (event.item.getData() != null) {
    fireTreeExpanded(new TreeExpansionEvent(this, event.item.getData()));
  }
}

public void treeExpanded(TreeExpansionEvent event) {
      if( event.getElement() instanceof SearchQuery ) {
     search((SearchQuery)event.getElement(), true);
   }
}

/**
 * Handles a tree expand event from the SWT widget.
 *
 * @param event
 *            the SWT tree event
 */
protected void handleTreeExpand(TreeEvent event) {
  createChildren(event.item);
  if (event.item.getData() != null) {
    fireTreeExpanded(new TreeExpansionEvent(this, event.item.getData()));
  }
}

  public void treeExpanded(TreeExpansionEvent event) {
    Object obj = event.getElement();
    if (obj instanceof IToc) {
      postUpdate(event.getElement());
    }
  }
});

protected void handleTreeExpand(TreeEvent event) {
  // Fix for Bug 271744 because windows expanding doesn't fire a focus lost
  if( isCellEditorActive() ) {
    applyEditorValue();
  }
  
  if (contentProviderIsLazy) {
    if (event.item.getData() != null) {
      Item[] children = getChildren(event.item);
      if (children.length == 1 && children[0].getData()==null) {
        // we have a dummy child node, ask for an updated child
        // count
        virtualLazyUpdateChildCount(event.item, children.length);
      }
      fireTreeExpanded(new TreeExpansionEvent(this, event.item
          .getData()));
    }
    return;
  }
  super.handleTreeExpand(event);
}

  public void treeExpanded(TreeExpansionEvent event) {
    Object element= event.getElement();
    if (element instanceof ICompilationUnit || 
      element instanceof IClassFile)
      expandMainType(element);
  }
};

@Override
protected void handleTreeExpand(TreeEvent event) {
  // Fix for Bug 271744 because windows expanding doesn't fire a focus lost
  if( isCellEditorActive() ) {
    applyEditorValue();
  }
  if (contentProviderIsLazy) {
    if (event.item.getData() != null) {
      Item[] children = getChildren(event.item);
      if (children.length == 1 && children[0].getData()==null) {
        // we have a dummy child node, ask for an updated child
        // count
        virtualLazyUpdateChildCount(event.item, children.length);
      }
      fireTreeExpanded(new TreeExpansionEvent(this, event.item
          .getData()));
    }
    return;
  }
  super.handleTreeExpand(event);
}

  @Override
  public void treeExpanded(TreeExpansionEvent event) {
    Object element= event.getElement();
    if (element instanceof ICompilationUnit ||
      element instanceof IClassFile)
      expandMainType(element);
  }
};

@Override
protected void handleTreeExpand(TreeEvent event) {
  // Fix for Bug 271744 because windows expanding doesn't fire a focus lost
  if( isCellEditorActive() ) {
    applyEditorValue();
  }
  if (contentProviderIsLazy) {
    if (event.item.getData() != null) {
      Item[] children = getChildren(event.item);
      if (children.length == 1 && children[0].getData()==null) {
        // we have a dummy child node, ask for an updated child
        // count
        virtualLazyUpdateChildCount(event.item, children.length);
      }
      fireTreeExpanded(new TreeExpansionEvent(this, event.item
          .getData()));
    }
    return;
  }
  super.handleTreeExpand(event);
}

  @Override
  public void treeExpanded(TreeExpansionEvent event) {
    Object element= event.getElement();
    if (element instanceof ICompilationUnit ||
      element instanceof IClassFile)
      expandMainType(element);
  }
};

public void treeCollapsed(TreeExpansionEvent event) {
  Object obj = event.getElement();
  if (obj instanceof IToc) {
    postUpdate(obj);
  }
}

/**
 * Handle the expansion of an element in a tree viewer.
 *
 * @param event the expansion event
 */
public void treeExpanded(TreeExpansionEvent event) {
  expandTreeElement(event.getElement());
}