Android Open Source - GameEngine Multi Touch Handler

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Back to project page GameEngine.
License

The source code is released under:
# Copyright 2013 JK Wood <joshuakwood@gmail.com> # This framework is released under the Dog-on-Fire License: # If use of this framework causes your dog to catch on fire, # you agree to send me five d...
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Java Source Code

package com.slaxer.framework.implementation;
// w  w w  .  ja v  a 2 s.c o m
import java.util.ArrayList;
import java.util.List;

import android.view.MotionEvent;
import android.view.View;

import com.slaxer.framework.Input.TouchEvent;
import com.slaxer.framework.Pool;
import com.slaxer.framework.Pool.PoolObjectFactory;

public class MultiTouchHandler implements TouchHandler {
  private static final int MAX_TOUCHPOINTS = 10;
  
  boolean[] isTouched = new boolean[MAX_TOUCHPOINTS];
  int[] touchX = new int[MAX_TOUCHPOINTS];
  int[] touchY = new int[MAX_TOUCHPOINTS];
  int[] id = new int[MAX_TOUCHPOINTS];
  Pool<TouchEvent> touchEventPool;
  List<TouchEvent> touchEvents = new ArrayList<TouchEvent>();
  List<TouchEvent> touchEventsBuffer = new ArrayList<TouchEvent>();
  float scaleX;
  float scaleY;

  public MultiTouchHandler(View view, float scaleX, float scaleY) {
    PoolObjectFactory<TouchEvent> factory = new PoolObjectFactory<TouchEvent>(){
      @Override
      public TouchEvent createObject(){
        return new TouchEvent();
      }
    };
    
    touchEventPool = new Pool<TouchEvent> (factory, 100);
    view.setOnTouchListener(this);
    
    this.scaleX = scaleX;
    this.scaleY = scaleY;
  }

  @Override
  public boolean onTouch(View v, MotionEvent event) {
    synchronized(this){
      int action = event.getAction() & MotionEvent.ACTION_MASK;
      int pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_ID_MASK) >> MotionEvent.ACTION_POINTER_ID_SHIFT;
      int pointerCount = event.getPointerCount();
      TouchEvent touchEvent;
      for(int touchEventIndex = 0; touchEventIndex < MAX_TOUCHPOINTS; touchEventIndex++){
        if(touchEventIndex >= pointerCount){
          isTouched[touchEventIndex] = false;
          id[touchEventIndex] = -1;
          continue;
        }
        int pointerId = event.getPointerId(touchEventIndex);
        if(event.getAction() != MotionEvent.ACTION_MOVE && touchEventIndex != pointerIndex){
          // if it's an up/down/cancel/out event, mask the id to see if we should process it for this touch point
          continue;
        }
        switch(action){
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_POINTER_DOWN:
          touchEvent = touchEventPool.newObject();
          touchEvent.type = TouchEvent.TOUCH_DOWN;
          touchEvent.pointer = pointerId;
          touchEvent.x = touchX[touchEventIndex] = (int)(event.getX(touchEventIndex) * scaleX);
          touchEvent.y = touchY[touchEventIndex] = (int)(event.getY(touchEventIndex)* scaleY);
          isTouched[touchEventIndex] = true;
          id[touchEventIndex] = pointerId;
          touchEventsBuffer.add(touchEvent);
          break;
        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_POINTER_UP:
        case MotionEvent.ACTION_CANCEL:
          touchEvent = touchEventPool.newObject();
          touchEvent.type = TouchEvent.TOUCH_UP;
          touchEvent.pointer = pointerId;
          touchEvent.x = touchX[touchEventIndex] = (int)(event.getX(touchEventIndex) * scaleX);
          touchEvent.y = touchY[touchEventIndex] = (int)(event.getY(touchEventIndex)* scaleY);
          isTouched[touchEventIndex] = false;
          id[touchEventIndex] = -1;
          touchEventsBuffer.add(touchEvent);
          break;
        case MotionEvent.ACTION_MOVE:
          touchEvent = touchEventPool.newObject();
          touchEvent.type = TouchEvent.TOUCH_DRAGGED;
          touchEvent.pointer = pointerId;
          touchEvent.x = touchX[touchEventIndex] = (int)(event.getX(touchEventIndex) * scaleX);
          touchEvent.y = touchY[touchEventIndex] = (int)(event.getY(touchEventIndex)* scaleY);
          isTouched[touchEventIndex] = true;
          id[touchEventIndex] = pointerId;
          touchEventsBuffer.add(touchEvent);
          break;
        }
      }
      return true;
    }
  }

  @Override
  public boolean isTouchDown(int pointer) {
    synchronized(this){
      int index = getIndex(pointer);
      if(index < 0 || index >= MAX_TOUCHPOINTS)
        return false;
      else
        return isTouched[index];
    }
  }

  @Override
  public int getTouchX(int pointer) {
    synchronized(this){
      int index = getIndex(pointer);
      if(index < 0 || index >= MAX_TOUCHPOINTS)
        return 0;
      else
        return touchX[index];
    }
  }

  @Override
  public int getTouchY(int pointer) {
    synchronized(this){
      int index = getIndex(pointer);
      if(index < 0 || index >= MAX_TOUCHPOINTS)
        return 0;
      else
        return touchY[index];
    }
  }

  @Override
  public List<TouchEvent> getTouchEvents() {
    synchronized(this){
      int length = touchEvents.size();
      for(int touchEventIndex = 0; touchEventIndex < length; touchEventIndex++){
        touchEventPool.free(touchEvents.get(touchEventIndex));
      }
      touchEvents.clear();
      touchEvents.addAll(touchEventsBuffer);
      touchEventsBuffer.clear();
      return touchEvents;
    }
  }
  
  private int getIndex(int pointerId){
    for(int index = 0; index < MAX_TOUCHPOINTS; index++){
      if(id[index] == pointerId)
        return index;
    }
    // No index? Can't have a negative index!
    return -1;
  }

}
Java Source Code List
