InterceptingListView, an Android ListView to use with SlidingUpPanel

InterceptingListView.java

package com.doomonafireball.demo.android.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ListView;

/**
 * User: derek Date: 12/7/13 Time: 2:37 PM
 *
 * This ListView intercepts all gestures when enabled, except for events when it has already been scrolled to the
 * top.
 *
 * It is designed to work with the SlidingUpPanel.
 */
public class InterceptingListView extends ListView {

    private boolean mIsIntercepting = false;
    private float mCurrX = 0.0f;
    private float mCurrY = 0.0f;

    public InterceptingListView(Context context) {
        super(context);
    }

    public InterceptingListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public InterceptingListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        super.onInterceptTouchEvent(event);
        getParent().requestDisallowInterceptTouchEvent(mIsIntercepting);
        final int action = event.getAction();
        if (action == MotionEvent.ACTION_DOWN) {
            mCurrX = event.getX();
            mCurrY = event.getY();
        }
        return super.onInterceptTouchEvent(event);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        final int action = event.getAction();
        if (action == MotionEvent.ACTION_MOVE) {
            int index = getFirstVisiblePosition();
            View v = getChildAt(0);
            int top = (v == null) ? 0 : v.getTop();
            if ((event.getY() - mCurrY) > Math.abs(event.getX() - mCurrX) && (index == 0) && (top
                    >= 0) && mIsIntercepting) {
                // User scrolled vertically
                mIsIntercepting = false;
                getParent().requestDisallowInterceptTouchEvent(false);
            }
        }
        return super.onTouchEvent(event);
    }

    public void setIsIntercepting(boolean isIntercepting) {
        mIsIntercepting = isIntercepting;
        getParent().requestDisallowInterceptTouchEvent(isIntercepting);
    }
}