/*
 * Copyright (c) 2015 [1076559197@qq.com | tchen0707@gmail.com]
 *
 * Licensed under the Apache License, Version 2.0 (the "License”);
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.library.widgets;

import android.content.Context;
import android.support.v4.view.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) {
		if (!isLocked) {
			return super.onTouchEvent(event);
		}
		return false;
	}

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

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

	public boolean isLocked() {
		return isLocked;
	}

}