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/*******************************************************************************
* Copyright (c) 2000, 2017 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.events;
import java.util.function.*;
import org.eclipse.swt.internal.*;
/**
* Classes which implement this interface provide methods
* that deal with the expanding and collapsing of <code>ExpandItem</code>s.
*
* <p>
* After creating an instance of a class that implements
* this interface it can be added to a <code>ExpandBar</code>
* control using the <code>addExpandListener</code> method and
* removed using the <code>removeExpandListener</code> method.
* When a item of the <code>ExpandBar</code> is expanded or
* collapsed, the appropriate method will be invoked.
* </p>
*
* @see ExpandAdapter
* @see ExpandEvent
*
* @since 3.2
*/
public interface ExpandListener extends SWTEventListener {
/**
* Sent when an item is collapsed.
*
* @param e an event containing information about the operation
*/
void itemCollapsed(ExpandEvent e);
/**
* Sent when an item is expanded.
*
* @param e an event containing information about the operation
*/
void itemExpanded(ExpandEvent e);
/**
* Static helper method to create a <code>ExpandListener</code> for the
* {@link #itemCollapsed(ExpandEvent e)}) method, given a lambda expression or a method reference.
*
* @param c the consumer of the event
* @return ExpandListener
* @since 3.107
*/
static ExpandListener itemCollapsedAdapter(Consumer<ExpandEvent> c) {
return new ExpandAdapter() {
@Override
public void itemCollapsed(ExpandEvent e) {
c.accept(e);
}
};
}
/**
* Static helper method to create a <code>ExpandListener</code> for the
* {@link #itemExpanded(ExpandEvent e)}) method, given a lambda expression or a method reference.
*
* @param c the consumer of the event
* @return ExpandListener
* @since 3.107
*/
static ExpandListener itemExpandedAdapter(Consumer<ExpandEvent> c) {
return new ExpandAdapter() {
@Override
public void itemExpanded(ExpandEvent e) {
c.accept(e);
}
};
}
}
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