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module com {  module sun {  module star {  module awt {  module tree {


/** An instance of this interface can get notifications from a TreeControl
    when nodes are expanded or collapsed.

    @see XTreeControl::addTreeExpansionListener
    @see XTreeControl::removeTreeExpansionListener
 */
interface XTreeExpansionListener: com::sun::star::lang::XEventListener
{
    /** Invoked when a node with children on demand is about to be expanded.

        <p>This event is invoked before the treeExpanding()
        event.</p>
    */
    void requestChildNodes( [in] TreeExpansionEvent Event );

    /** Invoked whenever a node in the tree is about to be expanded.

        @throws ExpandVetoException
            to notify the calling XTreeControl that expanding
            TreeExpansionEvent::Node should fail.
    */
    void treeExpanding( [in] TreeExpansionEvent Event )
        raises ( ExpandVetoException );

    /** Invoked whenever a node in the tree is about to be collapsed.

        @throws ExpandVetoException
            to notify the calling XTreeControl that collapsing
            TreeExpansionEvent::Node should fail.
    */
    void treeCollapsing( [in] TreeExpansionEvent Event )
        raises ( ExpandVetoException );

    /** Called whenever a node in the tree has been successfully expanded. */
    void treeExpanded( [in] TreeExpansionEvent Event );

    /** Called whenever a node in the tree has been successfully collapsed. */
    void treeCollapsed( [in] TreeExpansionEvent Event );
};


}; }; }; }; };

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