package com.doumee.lib_coremodel.view.swipmenu;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import androidx.viewpager.widget.PagerAdapter;
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import androidx.viewpager.widget.ViewPager;
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/**
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* Intro: 解决 滑动冲突的 ViewPager
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* <p>
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* 因为ViewPager 和 SwipMenuLayout都是水平方向滑动的控件。
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* 所以在一起使用时会有冲突，
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* 使用本控件(CstViewPager)，可以在ViewPager的第一页使用左滑。在ViewPager的最后一页使用右滑菜单。
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* <p>
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* Author: zhangxutong
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* E-mail: mcxtzhang@163.com
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* Home Page: http://blog.csdn.net/zxt0601
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* Created: 2017/9/27.
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* History:
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*/
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public class CstViewPager extends ViewPager {
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private static final String TAG = "zxt/CstViewPager";
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private int mLastX, mLastY;
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public CstViewPager(Context context) {
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super(context);
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}
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public CstViewPager(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent ev) {
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//Log.i(TAG, "onInterceptTouchEvent() called with: ev = [" + ev + "]");
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int x = (int) ev.getX();
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int y = (int) ev.getY();
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boolean intercept = false;
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switch (ev.getAction()) {
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case MotionEvent.ACTION_DOWN:
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break;
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case MotionEvent.ACTION_MOVE:
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if (isHorizontalScroll(x, y)) {
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//除了在 第一页的手指向右滑 ， 最后一页的左滑，其他时刻都是父控件需要拦截事件
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if (isReactFirstPage() && isScrollRight(x)) {
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//Log.e(TAG, "第一页的手指向右滑]");
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intercept = false;
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} else if (isReachLastPage() && isScrollLeft(x)) {
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//Log.e(TAG, "最后一页的左滑");
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intercept = false;
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} else {
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//Log.e(TAG, "其他情况");
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intercept = true;
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}
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} else {
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}
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break;
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case MotionEvent.ACTION_UP:
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break;
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default:
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break;
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}
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mLastX = x;
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mLastY = y;
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boolean onInterceptTouchEvent = super.onInterceptTouchEvent(ev);
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return intercept || onInterceptTouchEvent;
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}
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@Override
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public boolean onTouchEvent(MotionEvent ev) {
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//Log.i(TAG, "onTouchEvent() called with: ev = [" + ev + "]");
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return super.onTouchEvent(ev);
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}
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//是否在水平滑动
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private boolean isHorizontalScroll(int x, int y) {
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return Math.abs(y - mLastY) < Math.abs(x - mLastX);
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}
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//是否未到达最后一页
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private boolean isReachLastPage() {
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PagerAdapter adapter = getAdapter();
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if (null != adapter && adapter.getCount() - 1 == getCurrentItem()) {
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return true;
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} else {
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return false;
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}
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}
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//是否在第一页
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private boolean isReactFirstPage() {
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if (getCurrentItem() == 0) {
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return true;
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} else {
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return false;
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}
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}
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//是否左滑
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private boolean isScrollLeft(int x) {
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return x - mLastX < 0;
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}
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private boolean isScrollRight(int x) {
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return x - mLastX > 0;
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}
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}
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