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/*******************************************************************************
 * Copyright (c) 2000, 2013 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.jface.viewers;

import org.eclipse.core.runtime.Assert;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;

/**
 * A cell editor that manages a checkbox.
 * The cell editor's value is a boolean.
 * 
 * This class may be instantiated; it is not intended to be subclassed.
 * 
 * 
 * Note that this implementation simply fakes it and does does not create
 * any new controls. The mere activation of this editor means that the value
 * of the check box is being toggled by the end users; the listener method
 * applyEditorValue is immediately called to signal the change.
 * 
 * @noextend This class is not intended to be subclassed by clients.
 */
public class CheckboxCellEditor extends CellEditor {

    /**
     * The checkbox value.
     */
    /* package */
    boolean value = false;

    /**
     * Default CheckboxCellEditor style
     */
    private static final int defaultStyle = SWT.NONE;

    /**
     * Creates a new checkbox cell editor with no control
     * @since 2.1
     */
    public CheckboxCellEditor() {
        setStyle(defaultStyle);
    }

    /**
     * Creates a new checkbox cell editor parented under the given control.
     * The cell editor value is a boolean value, which is initially false.
     * Initially, the cell editor has no cell validator.
     *
     * @param parent the parent control
     */
    public CheckboxCellEditor(Composite parent) {
        this(parent, defaultStyle);
    }

    /**
     * Creates a new checkbox cell editor parented under the given control.
     * The cell editor value is a boolean value, which is initially false.
     * Initially, the cell editor has no cell validator.
     *
     * @param parent the parent control
     * @param style the style bits
     * @since 2.1
     */
    public CheckboxCellEditor(Composite parent, int style) {
        super(parent, style);
    }

    /**
     * The CheckboxCellEditor implementation of
     * this CellEditor framework method simulates
     * the toggling of the checkbox control and notifies
     * listeners with ICellEditorListener.applyEditorValue.
     */
    @Override
	public void activate() {
        value = !value;
        fireApplyEditorValue();
    }

    /**
     * The CheckboxCellEditor implementation of
     * this CellEditor framework method does
     * nothing and returns null.
     */
    @Override
	protected Control createControl(Composite parent) {
        return null;
    }

    /**
     * The CheckboxCellEditor implementation of
     * this CellEditor framework method returns
     * the checkbox setting wrapped as a Boolean.
     *
     * @return the Boolean checkbox value
     */
    @Override
	protected Object doGetValue() {
        return value ? Boolean.TRUE : Boolean.FALSE;
    }

    @Override
	protected void doSetFocus() {
        // Ignore
    }

    /**
     * The CheckboxCellEditor implementation of
     * this CellEditor framework method accepts
     * a value wrapped as a Boolean.
     *
     * @param value a Boolean value
     */
    @Override
	protected void doSetValue(Object value) {
        Assert.isTrue(value instanceof Boolean);
        this.value = ((Boolean) value).booleanValue();
    }

    @Override
	public void activate(ColumnViewerEditorActivationEvent activationEvent) {
    	if (activationEvent.eventType != ColumnViewerEditorActivationEvent.TRAVERSAL) {
    		super.activate(activationEvent);
    	}
    }
}