Android Open Source - AndroidFramework Multi Touch Handler

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This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a co...

Java Source Code

package com.mdobbins.implementation.framework;
/*from  w ww.ja v  a 2  s .co  m*/
import java.util.ArrayList;
import java.util.List;

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

import com.mdobbins.framework.Pool;
import com.mdobbins.framework.Input.TouchEvent;
import com.mdobbins.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 i = 0; i < MAX_TOUCHPOINTS; i++) {
                if (i >= pointerCount) {
                    isTouched[i] = false;
                    id[i] = -1;
                    continue;
                }
                int pointerId = event.getPointerId(i);
                if (event.getAction() != MotionEvent.ACTION_MOVE && i != 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[i] = (int) (event.getX(i) * scaleX);
                    touchEvent.y = touchY[i] = (int) (event.getY(i) * scaleY);
                    isTouched[i] = true;
                    id[i] = 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[i] = (int) (event.getX(i) * scaleX);
                    touchEvent.y = touchY[i] = (int) (event.getY(i) * scaleY);
                    isTouched[i] = false;
                    id[i] = -1;
                    touchEventsBuffer.add(touchEvent);
                    break;

                case MotionEvent.ACTION_MOVE:
                    touchEvent = touchEventPool.newObject();
                    touchEvent.type = TouchEvent.TOUCH_DRAGGED;
                    touchEvent.pointer = pointerId;
                    touchEvent.x = touchX[i] = (int) (event.getX(i) * scaleX);
                    touchEvent.y = touchY[i] = (int) (event.getY(i) * scaleY);
                    isTouched[i] = true;
                    id[i] = 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 len = touchEvents.size();
            for (int i = 0; i < len; i++)
                touchEventPool.free(touchEvents.get(i));
            touchEvents.clear();
            touchEvents.addAll(touchEventsBuffer);
            touchEventsBuffer.clear();
            return touchEvents;
        }
    }
   
    // returns the index for a given pointerId or -1 if no index.
    private int getIndex(int pointerId) {
        for (int i = 0; i < MAX_TOUCHPOINTS; i++) {
            if (id[i] == pointerId) {
                return i;
            }
        }
        return -1;
    }
}

Java Source Code List

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