Android Open Source - TileView Tween Handler

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Back to project page TileView.

License

The source code is released under:

MIT License

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Java Source Code

package com.qozix.animation;
//w ww.  j av a2s.c o m
import java.util.ArrayList;

import android.os.Handler;
import android.os.Message;

public class TweenHandler extends Handler {

  private static final int RENDER = 1;
  
  private static TweenHandler instance = null;
  public static TweenHandler getInstance(){
    if(instance == null){
      instance = new TweenHandler();
    }
    return instance;
  }
  
  private ArrayList<Tween> tweens = new ArrayList<Tween>();
  
  public void addTween( Tween tween ) {
    tweens.add( tween );
    sendEmptyMessage( RENDER );
  }
  
  public void removeTween( Tween tween ) {
    tweens.remove( tween );
    if( tweens.size() == 0 ) {
      if( hasMessages( RENDER ) ) {
        removeMessages( RENDER );
      }
    }
  }
  
  @Override
  public void handleMessage( final Message message ) {
    boolean tweensAreRunning = false;
    ArrayList<Tween> condemned = new ArrayList<Tween>();
    for( Tween tween : tweens ) {
      boolean tweenIsComplete = runTween( tween );
      if( !tweensAreRunning ) {
        if( !tweenIsComplete ) {
          tweensAreRunning = true;
        }
      }
      if( tweenIsComplete ){
        condemned.add( tween );
      }
    }
    if( tweensAreRunning ) {
      sendEmptyMessage( RENDER );
    } else {
      if( hasMessages( RENDER ) ) {
        removeMessages( RENDER );
      }
    }
    tweens.removeAll( condemned );
  }
  
  private boolean runTween( Tween tween ) {
    double ellapsed = System.currentTimeMillis() - tween.getStartTime();
    ellapsed = Math.min( ellapsed, tween.getDuration() );
    tween.setEllapsed( ellapsed );
    double progress = tween.getProgress();
    double eased = tween.getEasedProgress();
    for ( TweenListener l : tween.getTweenListeners() ) {
      l.onTweenProgress( progress, eased );
    }
    boolean complete = ellapsed >= tween.getDuration();
    if ( complete ) {      
      for ( TweenListener l : tween.getTweenListeners() ) {
        l.onTweenComplete();
      }
    }    
    return complete;    
  }
}

Java Source Code List