package com.zfdang.zsmth_android;

import android.content.Context;
import androidx.viewpager.widget.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;

/**
 * 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
 */

/**
 * 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 HackyViewPager extends ViewPager {

  private boolean isLocked;

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

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

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

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

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

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

  public boolean isLocked() {
    return isLocked;
  }
}