Android Open Source - AndroidImageViewZoom On Touch Single

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Back to project page AndroidImageViewZoom.

License

The source code is released under:

Copyright (c) 2011 Igor Crevar http://extrafull.com/igorcrevar/ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "...

Java Source Code

package com.rogicrew.imagezoom.ontouch;
//  w w w.  j  a  v  a 2s.com
import java.util.ArrayList;
import java.util.List;

import android.view.MotionEvent;

public class OnTouchSingle implements OnTouchInterface{
  private long mTimeForClick;
  private long mTimeForDoubleClick;
  
  private boolean mIsClick;
  private boolean mIsDoubleClick;
  private boolean mIsScroll;
  
  private long mTimeOfFirstPointerDown;
  private long mTimeOfLastClick;
  //holds pointers positions for last two clicks
  private Pointer[] mLastTwoClickPointers;
  private int mLastTwoClickPointersOffset; //0 or 1
  
  public OnTouchSingle()
  {
    mLastTwoClickPointers = new Pointer[] { new Pointer(0.0f, 0.0f, 0), new Pointer(0.0f, 0.0f, 0) };
    mLastTwoClickPointersOffset = 1;
  }
  
  @Override
  public void setTimes(long timeForClick, long timeForDoubleClick){
    mTimeForClick = timeForClick;
    mTimeForDoubleClick = timeForDoubleClick;
  }
  
  @Override
  public void init(){
    mTimeOfFirstPointerDown = mTimeOfLastClick = 0;
    mIsClick = mIsDoubleClick = mIsScroll = false;
  }
  
  @Override
  public void processEvent(MotionEvent event) {
    mIsClick = mIsDoubleClick = mIsScroll = false;
    
    final int action = event.getAction() & 255;    
    switch(action){
    case MotionEvent.ACTION_DOWN:
      mTimeOfFirstPointerDown = System.currentTimeMillis();
        mLastTwoClickPointersOffset = 1 - mLastTwoClickPointersOffset;
        mLastTwoClickPointers[mLastTwoClickPointersOffset].update(event.getX(), event.getY(), 0);
      break;
      
    case MotionEvent.ACTION_UP:
      if (System.currentTimeMillis() - mTimeOfFirstPointerDown <= mTimeForClick){               
             if (mTimeOfLastClick > 0  &&  
               System.currentTimeMillis() - mTimeOfLastClick <= mTimeForDoubleClick){
               mIsDoubleClick = true;
               mTimeOfLastClick = 0;
             }
             else{
               mTimeOfLastClick = System.currentTimeMillis();
               mIsClick = true;
             }
        }
      
    case MotionEvent.ACTION_MOVE:
      mLastTwoClickPointers[mLastTwoClickPointersOffset].update(event.getX(), event.getY(), 0);
         //if there is only one finger pressed
        mIsScroll = true;
      break;
      
    case MotionEvent.ACTION_CANCEL:
      init();
      break;
    }
  }

  @Override
  public boolean isDoubleClick() {
    return mIsDoubleClick;
  }

  @Override
  public boolean isSingleClick() {
    return mIsClick;
  }

  @Override
  public boolean isScroll() {
    return mIsScroll;
  }
  
  @Override
  public boolean isMove() {    
    return mIsScroll;
  }

  @Override
  public boolean isMultitouch() {    
    return false;
  }

  @Override
  public Pointer getClickPoint() {
    if (mIsClick || mIsScroll){
      return mLastTwoClickPointers[mLastTwoClickPointersOffset];
    }
    else if (mIsDoubleClick){
      return mLastTwoClickPointers[1 - mLastTwoClickPointersOffset];
    }
    
    return null;
  }

  @Override
  public List<Pointer> getAllPoints() {
    List<Pointer> rv = new ArrayList<Pointer>();
    rv.add(mLastTwoClickPointers[mLastTwoClickPointersOffset]);
    return rv;
  }
}

Java Source Code List

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