import com.facebook.rebound.SpringListener; //导入依赖的package包/类
/**
 * @param spring
 * 		the underlying {@link com.facebook.rebound.Spring}.
 * @param eventImitator
 * 		maps an event to a {@link com.facebook.rebound.Spring}
 * @param performers
 * 		map the {@link com.facebook.rebound.Spring} to a
 * 		{@link android.view.View}
 * @param springListeners
 * 		additional listeners to attach
 * @return the builder for chaining
 */
@NonNull
public Builder addMotion(@NonNull final Spring spring, @NonNull final EventImitator eventImitator,
                         @NonNull final Performer[] performers, final SpringListener[] springListeners) {

	// create struct
	final Motion motion = new Motion(spring, eventImitator, performers, springListeners);

	// connect actors
	motion.imitators[0].setSpring(motion.spring);

	for (Performer performer : motion.performers) {
		performer.setTarget(mView);
	}

	mMotions.add(motion);

	return this;
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
/**
 * Creations a new motion object.
 *
 * @param spring
 * 		the spring to use
 * @param motionProperties
 * 		the properties of the event to track
 * @param springListeners
 * 		additional spring listeners to add
 * @param trackStrategy
 * 		the tracking strategy
 * @param followStrategy
 * 		the follow strategy
 * @param restValue
 * 		the spring rest value
 * @return a motion object
 */
@Nullable
private Motion createMotionFromProperties(@NonNull final Spring spring,
                                          @NonNull final MotionProperty[] motionProperties,
                                          @Nullable final SpringListener[] springListeners,
                                          final int trackStrategy, final int followStrategy,
                                          final int restValue) {

	final MotionImitator[] motionImitators = new MotionImitator[motionProperties.length];
	final Performer[] performers = new Performer[motionProperties.length];

	for (int i = 0; i < motionProperties.length; i++) {

		final MotionProperty property = motionProperties[i];

		motionImitators[i] = new MotionImitator(spring, property, restValue, trackStrategy, followStrategy);
		performers[i] = new Performer(mView, property.getViewProperty());
	}

	return new Motion(spring, motionImitators, performers, springListeners);
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public SpringConfiguratorView(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);

  SpringSystem springSystem = SpringSystem.create();
  springConfigRegistry = SpringConfigRegistry.getInstance();
  spinnerAdapter = new SpinnerAdapter(context);

  Resources resources = getResources();
  mRevealPx = dpToPx(40, resources);
  mStashPx = dpToPx(280, resources);

  mRevealerSpring = springSystem.createSpring();
  SpringListener revealerSpringListener = new RevealerSpringListener();
  mRevealerSpring
      .setCurrentValue(1)
      .setEndValue(1)
      .addListener(revealerSpringListener);

  addView(generateHierarchy(context));

  SeekbarListener seekbarListener = new SeekbarListener();
  mTensionSeekBar.setMax(MAX_SEEKBAR_VAL);
  mTensionSeekBar.setOnSeekBarChangeListener(seekbarListener);

  mFrictionSeekBar.setMax(MAX_SEEKBAR_VAL);
  mFrictionSeekBar.setOnSeekBarChangeListener(seekbarListener);

  mSpringSelectorSpinner.setAdapter(spinnerAdapter);
  mSpringSelectorSpinner.setOnItemSelectedListener(new SpringSelectedListener());
  refreshSpringConfigurations();

  this.setTranslationY(mStashPx);
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
private Motion(@NonNull final Spring spring, @NonNull final Performer[] performers,
               @Nullable final SpringListener[] springListeners) {
	this.imitators = new MotionImitator[0];
	this.performers = performers;
	this.spring = spring;
	this.springListeners = springListeners;
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
/**
 * Removes all spring listeners controlled by this {@link Actor}.
 */
public void removeAllListeners() {
	for (Motion motion : mMotions) {
		for (Performer performer : motion.performers) {
			motion.spring.removeListener(performer);
		}

		if (motion.springListeners != null) {
			for (SpringListener listener : motion.springListeners) {
				motion.spring.removeListener(listener);
			}
		}
	}
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
/**
 * Adds all spring listeners back.
 */
public void addAllListeners() {
	for (Motion motion : mMotions) {
		for (Performer performer : motion.performers) {
			motion.spring.addListener(performer);
		}

		if (motion.springListeners != null) {
			for (SpringListener listener : motion.springListeners) {
				motion.spring.addListener(listener);
			}
		}
	}
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public SpringConfiguratorView(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);

  SpringSystem springSystem = SpringSystem.create();
  springConfigRegistry = SpringConfigRegistry.getInstance();
  spinnerAdapter = new SpinnerAdapter(context);

  Resources resources = getResources();
  mRevealPx = dpToPx(40, resources);
  mStashPx = dpToPx(280, resources);

  mRevealerSpring = springSystem.createSpring();
  SpringListener revealerSpringListener = new RevealerSpringListener();
  mRevealerSpring
      .setCurrentValue(1)
      .setEndValue(1)
      .addListener(revealerSpringListener);

  addView(generateHierarchy(context));

  SeekbarListener seekbarListener = new SeekbarListener();
  mTensionSeekBar.setMax(MAX_SEEKBAR_VAL);
  mTensionSeekBar.setOnSeekBarChangeListener(seekbarListener);

  mFrictionSeekBar.setMax(MAX_SEEKBAR_VAL);
  mFrictionSeekBar.setOnSeekBarChangeListener(seekbarListener);

  mSpringSelectorSpinner.setAdapter(spinnerAdapter);
  mSpringSelectorSpinner.setOnItemSelectedListener(new SpringSelectedListener());
  refreshSpringConfigurations();

  //this.setTranslationY(mStashPx);
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
public Spring createSpringFromBouncinessAndSpeed(double bounciness, double speed, SpringListener springListener){
    return mSpringSystem.createSpring().setSpringConfig(
            SpringConfig.fromBouncinessAndSpeed(bounciness,speed))
            .addListener(springListener);
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
public SpringListener getHorizontalPositionListener() {
    return xPositionListener;
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
public SpringListener getVerticalPositionListener() {
    return yPositionListener;
}
 

import com.facebook.rebound.SpringListener; //导入依赖的package包/类
/**
 * Uses the default {@link com.facebook.rebound.SpringConfig} to animate the view.
 *
 * @param property
 * 		the event field to imitate and the view property to animate.
 * @param listener
 * 		a listener to call
 * @return this builder for chaining
 */
@NonNull
public Builder addTranslateMotion(final MotionProperty property, final SpringListener listener) {
	return addMotion(mSpringSystem.createSpring(), Imitator.TRACK_ABSOLUTE,
			Imitator.FOLLOW_EXACT, new MotionProperty[] { property },
			new SpringListener[] { listener });
}