SelectionProviderIntermediate.java 文件源码

/**
 * Sets a new selection provider to delegate to. Selection listeners registered with the previous delegate
 * are removed before.
 * 
 * @param newDelegate
 *            new selection provider
 */
public void setSelectionProviderDelegate(ISelectionProvider newDelegate) {
    if (delegate != newDelegate) {
        if (delegate != null) {
            delegate.removeSelectionChangedListener(selectionListener);
            if (delegate instanceof IPostSelectionProvider) {
                ((IPostSelectionProvider)delegate).removePostSelectionChangedListener(
                        postSelectionListener);
            }
        }
        delegate = newDelegate;
        if (newDelegate != null) {
            newDelegate.addSelectionChangedListener(selectionListener);
            if (newDelegate instanceof IPostSelectionProvider) {
                ((IPostSelectionProvider)newDelegate).addPostSelectionChangedListener(
                        postSelectionListener);
            }
            fireSelectionChanged(newDelegate.getSelection());
            firePostSelectionChanged(newDelegate.getSelection());
        }
    }
}