ReversableAnimChannelControl

package sneak.util;

import com.jme3.animation.AnimChannel;
import com.jme3.animation.AnimControl;
import com.jme3.animation.LoopMode;
import com.jme3.export.JmeExporter;
import com.jme3.export.JmeImporter;
import com.jme3.math.FastMath;
import com.jme3.renderer.RenderManager;
import com.jme3.renderer.ViewPort;
import com.jme3.scene.Spatial;
import com.jme3.scene.control.Control;
import java.io.IOException;

/**
 * Add this control to a spatial with an AnimControl. allows setting an animation to play in reverse by using hackery.
 *
 * to play an animation in reverse use a negative speed
 *
 * note: will not notify onAnimDone() to animaitonal listeners. though this could be added very easily. just choose your hack. reflection, or changing the package name.
 *
 * @author Daniel Strong
 * @see http://hub.jmonkeyengine.org/forum/topic/imported-blend-file-only-retains-1-animation/
 */
public class ReversableAnimChannelControl implements Control {

        private final AnimChannel animChannel;
        private final String animName0;
        private LoopMode negativeLoopMode = null;
        private float timer = 0;

        public ReversableAnimChannelControl(AnimControl animControl) {
                this(animControl.createChannel());
        }

        public ReversableAnimChannelControl(AnimChannel animChannel) {
                this.animChannel = animChannel;
                animName0 = animChannel.getControl().getAnimationNames().iterator().next();
        }

        @Override
        public void update(float tpf) {
                if (!animChannel.getControl().isEnabled() || negativeLoopMode == null) {
                        return;
                }

                timer -= tpf;
                if (timer < 0) {
                        switch (negativeLoopMode) {
                                case Loop:
                                        animChannel.setTime(animChannel.getAnimMaxTime());
                                        timer = animChannel.getAnimMaxTime();
                                        break;
                                case DontLoop:
                                        animChannel.reset(true);
                                        negativeLoopMode = null;
                                        break;
                                case Cycle:
                                        break;
                                default:
                                        throw new AssertionError(negativeLoopMode.name());

                        }
                }
        }

        public AnimControl getAnimControl() {
                return animChannel.getControl();
        }

        public AnimChannel getAnimChannel() {
                return animChannel;
        }

        public void setAnim() {
                setAnim(LoopMode.DontLoop, 1);
        }

        public void setAnim(LoopMode loopMode) {
                setAnim(loopMode, 1);
        }

        public void setAnim(float speed) {
                setAnim(LoopMode.DontLoop, speed);
        }

        public void setAnim(LoopMode loopMode, float speed) {
                setAnim(animName0, loopMode, speed);
        }

        public void setAnim(String animName, LoopMode loopMode, float speed) {
                animChannel.setAnim(animName);
                if (speed > 0) {
                        negativeLoopMode = null;
                        animChannel.setLoopMode(loopMode);
                        animChannel.setSpeed(speed);
                } else {
                        negativeLoopMode = loopMode;
                        animChannel.setLoopMode(LoopMode.Cycle);
                        animChannel.setSpeed(FastMath.abs(speed));
                        animChannel.setTime(animChannel.getAnimMaxTime());
                        timer = animChannel.getAnimMaxTime();
                }
        }

        @Override
        public Control cloneForSpatial(Spatial spatial) {
                return null;
        }

        @Override
        public void setSpatial(Spatial spatial) {
        }

        @Override
        public void render(RenderManager rm, ViewPort vp) {
        }

        @Override
        public void write(JmeExporter ex) throws IOException {
        }

        @Override
        public void read(JmeImporter im) throws IOException {
        }

}