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/*******************************************************************************
* Copyright (c) 2000, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.viewers;
/**
* Interface for objects that support elements with a checked state.
*
* @see ICheckStateListener
* @see CheckStateChangedEvent
*/
public interface ICheckable {
/**
* Adds a listener for changes to the checked state of elements
* in this viewer.
* Has no effect if an identical listener is already registered.
*
* @param listener a check state listener
*/
public void addCheckStateListener(ICheckStateListener listener);
/**
* Returns the checked state of the given element.
*
* @param element the element
* @return true if the element is checked,
* and false if not checked
*/
public boolean getChecked(Object element);
/**
* Removes the given check state listener from this viewer.
* Has no effect if an identical listener is not registered.
*
* @param listener a check state listener
*/
public void removeCheckStateListener(ICheckStateListener listener);
/**
* Sets the checked state for the given element in this viewer.
* Does not fire events to check state listeners.
*
* @param element the element
* @param state true if the item should be checked,
* and false if it should be unchecked
* @return true if the checked state could be set,
* and false otherwise
*/
public boolean setChecked(Object element, boolean state);
}