package ua.gov.dp.econtact.view;

/**
 * Found at http://stackoverflow.com/questions/7814017/is-it-possible-to-disable-scrolling-on-a-viewpager.
 * Convenient way to temporarily disable ViewPager navigation while interacting with ImageView.
 *
 * Julia Zudikova
 */

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;

/**
 * Hacky fix for Issue #4 and
 * http://code.google.com/p/android/issues/detail?id=18990
 * <p/>
 * ScaleGestureDetector seems to mess up the touch events, which means that
 * ViewGroups which make use of onInterceptTouchEvent throw a lot of
 * IllegalArgumentException: pointerIndex out of range.
 * <p/>
 * There's not much I can do in my code for now, but we can mask the result by
 * just catching the problem and ignoring it.
 *
 * @author Chris Banes
 */
public class ImageViewPager extends ViewPager {

    private boolean isLocked;

    public ImageViewPager(final Context context) {
        super(context);
        isLocked = false;
    }

    public ImageViewPager(final Context context, final AttributeSet attrs) {
        super(context, attrs);
        isLocked = false;
    }

    @Override
    public boolean onInterceptTouchEvent(final MotionEvent ev) {
        if (!isLocked) {
            try {
                return super.onInterceptTouchEvent(ev);
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
                return false;
            }
        }
        return false;
    }

    @Override
    public boolean onTouchEvent(final MotionEvent event) {
        return !isLocked && super.onTouchEvent(event);
    }

    public void toggleLock() {
        isLocked = !isLocked;
    }

    public void setLocked(final boolean isLocked) {
        this.isLocked = isLocked;
    }

    public boolean isLocked() {
        return isLocked;
    }

}
