com.netease.hearttouch.htimagepicker.core.view.photoview.PhotoViewPager.java Source code

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Here is the source code for com.netease.hearttouch.htimagepicker.core.view.photoview.PhotoViewPager.java

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/*
 * Copyright by Netease (c) 2016.
 * This source code is licensed under the MIT-style license found in the LICENSE file
 *  in the root directory of this source tree.
 */

package com.netease.hearttouch.htimagepicker.core.view.photoview;

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

/**
 * Created by liuhongtao on 15/7/23.
 */
public class PhotoViewPager extends ViewPager {
    public PhotoViewPager(Context context) {
        super(context);
    }

    public PhotoViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        addOnPageChangeListener(new InnerOnPageChangeListenerImp());
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        try {
            return super.onInterceptTouchEvent(ev);
        } catch (Exception e) {
            // ignore it
        }

        return false;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        try {
            return super.onTouchEvent(ev);
        } catch (IllegalArgumentException ex) {
            // ignore it
        }
        return false;
    }

    private boolean mIsDisallowIntercept = false;

    @Override
    public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
        mIsDisallowIntercept = disallowIntercept;
        super.requestDisallowInterceptTouchEvent(disallowIntercept);
    }

    @Override
    public boolean dispatchTouchEvent(@NonNull MotionEvent ev) {
        if (ev.getPointerCount() > 1 && mIsDisallowIntercept) {
            requestDisallowInterceptTouchEvent(false);
            boolean handled = super.dispatchTouchEvent(ev);
            requestDisallowInterceptTouchEvent(true);
            return handled;
        } else {
            return super.dispatchTouchEvent(ev);
        }
    }

    private class InnerOnPageChangeListenerImp implements OnPageChangeListener {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        }

        @Override
        public void onPageSelected(int position) {
            PagerAdapter adapter = getAdapter();
            if (adapter instanceof ViewPagerAdapter) {
                ((ViewPagerAdapter) adapter).resetPhotoViews();
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    }
}