Android Open Source - Aviary-Android-SDK Scroller Runnable

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Java Source Code

package com.aviary.android.feather.widget;
/*from  w w  w  .  j a va2s . c om*/
import android.annotation.TargetApi;
import android.view.View;
import android.view.animation.Interpolator;
import android.widget.OverScroller;
import android.widget.Scroller;

public class ScrollerRunnable implements Runnable {

  public static interface ScrollableView {

    boolean removeCallbacks( Runnable action );

    boolean post( Runnable action );

    void scrollIntoSlots();

    void trackMotionScroll( int newX );

    int getMinX();

    int getMaxX();
  }

  protected int mLastFlingX;
  protected boolean mShouldStopFling;
  protected ScrollableView mParent;
  protected int mAnimationDuration;
  protected int mPreviousX;
  protected boolean mHasMore;

  private OverScroller mScroller;
  private int mOverscrollDistance;

  /**
   * ScrollerRunnable acts like a {@link Scroller} adding some help methods
   * 
   * @param parent
   *            the parent view
   * @param animationDuration
   *            the default animation duration
   * @param overscrollDistance
   *            the overscroller distance
   * @param interpolator
   *            the default interpolator, can be null
   */
  public ScrollerRunnable ( ScrollableView parent, int animationDuration, int overscrollDistance, Interpolator interpolator ) {
    if ( null == interpolator ) {
      mScroller = new OverScroller( ( (View) parent ).getContext() );
    } else {
      mScroller = new OverScroller( ( (View) parent ).getContext(), interpolator );
    }

    mOverscrollDistance = overscrollDistance;
    mParent = parent;
    mAnimationDuration = animationDuration;
  }

  public int getLastFlingX() {
    return mLastFlingX;
  }

  protected void startCommon() {
    mParent.removeCallbacks( this );
  }

  public void stop( boolean scrollIntoSlots ) {
    mParent.removeCallbacks( this );
    endFling( scrollIntoSlots );
  }

  public void endFling( boolean scrollIntoSlots ) {
    abortAnimation();
    mLastFlingX = 0;
    mHasMore = false;

    if ( scrollIntoSlots ) {
      mParent.scrollIntoSlots();
    }
  }

  public void startUsingDistance( int initialX, int distance ) {
    if ( distance == 0 ) return;
    startCommon();
    mLastFlingX = initialX;
    mScroller.startScroll( initialX, 0, distance, 0, mAnimationDuration );
    mParent.post( this );
  }

  public void startUsingVelocity( int initialX, int initialVelocity ) {
    if ( initialVelocity == 0 ) return;
    startCommon();
    mLastFlingX = initialX;
    mScroller.fling( initialX, 0, initialVelocity, 0, mParent.getMinX(), mParent.getMaxX(), 0, Integer.MAX_VALUE, mOverscrollDistance, 0 );
    mParent.post( this );
  }

  public int getPreviousX() {
    return mPreviousX;
  }

  public boolean hasMore() {
    return mHasMore;
  }

  @TargetApi ( 14 )
  public float getCurrVelocity() {
    return mScroller.getCurrVelocity();
  }

  public boolean isFinished() {
    return mScroller.isFinished();
  }

  public boolean springBack( int startX, int startY, int minX, int maxX, int minY, int maxY ) {
    return mScroller.springBack( startX, startY, minX, maxX, minY, maxY );
  }

  public boolean computeScrollOffset() {
    return mScroller.computeScrollOffset();
  }

  public int getCurrX() {
    return mScroller.getCurrX();
  }

  protected void abortAnimation() {
    mScroller.abortAnimation();
  }

  @Override
  public void run() {
    mShouldStopFling = false;
    mPreviousX = getCurrX();
    mHasMore = computeScrollOffset();
    int x = getCurrX();
    mParent.trackMotionScroll( x );

    if ( mHasMore && !mShouldStopFling ) {
      mLastFlingX = x;
      mParent.post( this );
    } else {
      endFling( true );
    }
  }

}

Java Source Code List