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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.action;

import org.eclipse.pde.api.tools.annotations.NoExtend;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.CoolBar;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.ToolBar;

/**
 * A SubContributionItem is a wrapper for an IContributionItem.
 * It is used within a SubContributionManager to control the visibility
 * of items.
 * 
 * This class is not intended to be subclassed.
 * 
 */
@NoExtend
public class SubContributionItem implements IContributionItem {
	/**
	 * The visibility of the item.
	 */
	private boolean visible;

	/**
	 * The inner item for this contribution.
	 */
	private IContributionItem innerItem;

	/**
	 * Creates a new SubContributionItem.
	 * @param item the contribution item to be wrapped
	 */
	public SubContributionItem(IContributionItem item) {
		innerItem = item;
	}

	/**
	 * The default implementation of this IContributionItem
	 * delegates to the inner item. Subclasses may override.
	 */
	@Override
	public void dispose() {
		innerItem.dispose();
	}

	@Override
	public void fill(Composite parent) {
		if (visible) {
			innerItem.fill(parent);
		}
	}

	@Override
	public void fill(Menu parent, int index) {
		if (visible) {
			innerItem.fill(parent, index);
		}
	}

	@Override
	public void fill(ToolBar parent, int index) {
		if (visible) {
			innerItem.fill(parent, index);
		}
	}

	@Override
	public String getId() {
		return innerItem.getId();
	}

	/**
	 * Returns the inner contribution item.
	 *
	 * @return the inner contribution item
	 */
	public IContributionItem getInnerItem() {
		return innerItem;
	}

	@Override
	public boolean isEnabled() {
		return innerItem.isEnabled();
	}

	@Override
	public boolean isDirty() {
		return innerItem.isDirty();
	}

	@Override
	public boolean isDynamic() {
		return innerItem.isDynamic();
	}

	@Override
	public boolean isGroupMarker() {
		return innerItem.isGroupMarker();
	}

	@Override
	public boolean isSeparator() {
		return innerItem.isSeparator();
	}

	@Override
	public boolean isVisible() {
		return visible && innerItem.isVisible();
	}

	@Override
	public void setParent(IContributionManager parent) {
		// do nothing, the parent of our inner item
		// is its SubContributionManager
	}

	@Override
	public void setVisible(boolean visible) {
		this.visible = visible;
	}

	@Override
	public void update() {
		innerItem.update();
	}

	@Override
	public void update(String id) {
		innerItem.update(id);
	}

	@Override
	public void fill(CoolBar parent, int index) {
		if (visible) {
			innerItem.fill(parent, index);
		}
	}

	@Override
	public void saveWidgetState() {
	}

	@Override
	public String toString() {
		StringBuilder builder = new StringBuilder();
		builder.append("SubContributionItem [visible="); //$NON-NLS-1$
		builder.append(visible);
		builder.append(", "); //$NON-NLS-1$
		if (innerItem != null) {
			builder.append("innerItem="); //$NON-NLS-1$
			builder.append(innerItem);
		}
		builder.append("]"); //$NON-NLS-1$
		return builder.toString();
	}

}