LayoutAction.java

/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.scenes.scene2d.actions;

import com.badlogic.gdx.scenes.scene2d.Action;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.utils.Layout;
import com.badlogic.gdx.utils.GdxRuntimeException;

/**
 * Sets an actor's {@link Layout#setLayoutEnabled(boolean) layout} to enabled or disabled. The actor must implements
 * {@link Layout}.
 * 
 * @author Nathan Sweet
 */
public class LayoutAction extends Action {
	private boolean enabled;

	public void setActor(Actor actor) {
		if (actor != null && !(actor instanceof Layout))
			throw new GdxRuntimeException("Actor must implement layout: " + actor);
		super.setActor(actor);
	}

	public boolean act(float delta) {
		((Layout) actor).setLayoutEnabled(enabled);
		return true;
	}

	public boolean isEnabled() {
		return enabled;
	}

	public void setLayoutEnabled(boolean enabled) {
		this.enabled = enabled;
	}
}