/**
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* Copyright 2015 bingoogolapple
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* <p/>
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* <p/>
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* http://www.apache.org/licenses/LICENSE-2.0
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* <p/>
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.hdl.photovoltaic.widget.refreshlayout;
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import android.content.Context;
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import android.graphics.Rect;
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import android.util.DisplayMetrics;
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import android.view.View;
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import android.view.ViewParent;
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import android.view.WindowManager;
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import android.webkit.WebView;
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import android.widget.AbsListView;
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import android.widget.ScrollView;
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import androidx.core.view.ViewCompat;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.recyclerview.widget.StaggeredGridLayoutManager;
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import java.lang.reflect.Field;
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/**
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* 作者:王浩 邮件:bingoogolapple@gmail.com
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* 创建时间:15/10/28 上午2:26
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* 描述:
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*/
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public class BGARefreshScrollingUtil {
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private BGARefreshScrollingUtil() {
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}
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public static boolean isScrollViewOrWebViewToTop(View view) {
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return view != null && view.getScrollY() == 0;
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}
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public static boolean isAbsListViewToTop(AbsListView absListView) {
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if (absListView != null) {
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int firstChildTop = 0;
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if (absListView.getChildCount() > 0) {
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// 如果AdapterView的子控件数量不为0，获取第一个子控件的top
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firstChildTop = absListView.getChildAt(0).getTop() - absListView.getPaddingTop();
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}
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if (absListView.getFirstVisiblePosition() == 0 && firstChildTop == 0) {
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return true;
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}
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}
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return false;
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}
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public static boolean isRecyclerViewToTop(RecyclerView recyclerView) {
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if (recyclerView != null) {
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RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
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if (manager == null) {
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return true;
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}
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if (manager.getItemCount() == 0) {
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return true;
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}
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if (manager instanceof LinearLayoutManager) {
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LinearLayoutManager layoutManager = (LinearLayoutManager) manager;
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int firstChildTop = 0;
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if (recyclerView.getChildCount() > 0) {
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// 处理item高度超过一屏幕时的情况
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View firstVisibleChild = recyclerView.getChildAt(0);
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if (firstVisibleChild != null && firstVisibleChild.getMeasuredHeight() >= recyclerView.getMeasuredHeight()) {
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if (android.os.Build.VERSION.SDK_INT < 14) {
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return !(ViewCompat.canScrollVertically(recyclerView, -1) || recyclerView.getScrollY() > 0);
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} else {
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return !ViewCompat.canScrollVertically(recyclerView, -1);
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}
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}
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// 如果RecyclerView的子控件数量不为0，获取第一个子控件的top
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// 解决item的topMargin不为0时不能触发下拉刷新
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View firstChild = recyclerView.getChildAt(0);
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RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) firstChild.getLayoutParams();
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firstChildTop = firstChild.getTop() - layoutParams.topMargin - getRecyclerViewItemTopInset(layoutParams) - recyclerView.getPaddingTop();
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}
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if (layoutManager.findFirstCompletelyVisibleItemPosition() < 1 && firstChildTop == 0) {
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return true;
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}
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} else if (manager instanceof StaggeredGridLayoutManager) {
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StaggeredGridLayoutManager layoutManager = (StaggeredGridLayoutManager) manager;
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int[] out = layoutManager.findFirstCompletelyVisibleItemPositions(null);
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if (out[0] < 1) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* 通过反射获取RecyclerView的item的topInset
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*
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* @param layoutParams
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* @return
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*/
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private static int getRecyclerViewItemTopInset(RecyclerView.LayoutParams layoutParams) {
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try {
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Field field = RecyclerView.LayoutParams.class.getDeclaredField("mDecorInsets");
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field.setAccessible(true);
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// 开发者自定义的滚动监听器
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Rect decorInsets = (Rect) field.get(layoutParams);
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return decorInsets.top;
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} catch (Exception e) {
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e.printStackTrace();
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}
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return 0;
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}
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public static boolean isStickyNavLayoutToTop(BGAStickyNavLayout stickyNavLayout) {
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return isScrollViewOrWebViewToTop(stickyNavLayout) && stickyNavLayout.isContentViewToTop();
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}
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public static boolean isWebViewToBottom(WebView webView) {
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return webView != null && webView.getContentHeight() * webView.getScale() == (webView.getScrollY() + webView.getMeasuredHeight());
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}
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public static boolean isScrollViewToBottom(ScrollView scrollView) {
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if (scrollView != null) {
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int scrollContentHeight = scrollView.getScrollY() + scrollView.getMeasuredHeight() - scrollView.getPaddingTop() - scrollView.getPaddingBottom();
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int realContentHeight = scrollView.getChildAt(0).getMeasuredHeight();
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if (scrollContentHeight == realContentHeight) {
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return true;
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}
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}
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return false;
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}
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public static boolean isNestedScrollLayoutToBottom(NestedScrollLayout nestedScrollLayout) {
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if (nestedScrollLayout != null) {
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int scrollContentHeight = nestedScrollLayout.getScrollY() + nestedScrollLayout.getMeasuredHeight() - nestedScrollLayout.getPaddingTop() - nestedScrollLayout.getPaddingBottom();
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int realContentHeight = nestedScrollLayout.getChildAt(0).getMeasuredHeight();
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if (scrollContentHeight == realContentHeight) {
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return true;
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}
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}
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return false;
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}
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public static boolean isAbsListViewToBottom(AbsListView absListView) {
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if (absListView != null && absListView.getAdapter() != null && absListView.getChildCount() > 0 && absListView.getLastVisiblePosition() == absListView.getAdapter().getCount() - 1) {
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View lastChild = absListView.getChildAt(absListView.getChildCount() - 1);
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BGAStickyNavLayout stickyNavLayout = getStickyNavLayout(absListView);
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if (stickyNavLayout != null) {
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// 处理BGAStickyNavLayout中lastChild.getBottom() <= absListView.getMeasuredHeight()失效问题
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// 0表示x，1表示y
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int[] location = new int[2];
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lastChild.getLocationOnScreen(location);
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int lastChildBottomOnScreen = location[1] + lastChild.getMeasuredHeight();
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stickyNavLayout.getLocationOnScreen(location);
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int stickyNavLayoutBottomOnScreen = location[1] + stickyNavLayout.getMeasuredHeight();
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return lastChildBottomOnScreen + absListView.getPaddingBottom() <= stickyNavLayoutBottomOnScreen;
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} else {
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return lastChild.getBottom() <= absListView.getMeasuredHeight();
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}
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}
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return false;
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}
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public static boolean isRecyclerViewToBottom(RecyclerView recyclerView) {
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if (recyclerView != null) {
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RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
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if (manager == null || manager.getItemCount() == 0) {
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return false;
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}
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if (manager instanceof LinearLayoutManager) {
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// 处理item高度超过一屏幕时的情况
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View lastVisibleChild = recyclerView.getChildAt(recyclerView.getChildCount() - 1);
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if (lastVisibleChild != null && lastVisibleChild.getMeasuredHeight() >= recyclerView.getMeasuredHeight()) {
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if (android.os.Build.VERSION.SDK_INT < 14) {
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return !(ViewCompat.canScrollVertically(recyclerView, 1) || recyclerView.getScrollY() < 0);
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} else {
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return !ViewCompat.canScrollVertically(recyclerView, 1);
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}
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}
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LinearLayoutManager layoutManager = (LinearLayoutManager) manager;
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if (layoutManager.findLastCompletelyVisibleItemPosition() == layoutManager.getItemCount() - 1) {
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BGAStickyNavLayout stickyNavLayout = getStickyNavLayout(recyclerView);
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if (stickyNavLayout != null) {
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// 处理BGAStickyNavLayout中findLastCompletelyVisibleItemPosition失效问题
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View lastCompletelyVisibleChild = layoutManager.getChildAt(layoutManager.findLastCompletelyVisibleItemPosition());
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if (lastCompletelyVisibleChild == null) {
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return true;
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} else {
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// 0表示x，1表示y
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int[] location = new int[2];
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lastCompletelyVisibleChild.getLocationOnScreen(location);
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int lastChildBottomOnScreen = location[1] + lastCompletelyVisibleChild.getMeasuredHeight();
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stickyNavLayout.getLocationOnScreen(location);
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int stickyNavLayoutBottomOnScreen = location[1] + stickyNavLayout.getMeasuredHeight();
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return lastChildBottomOnScreen <= stickyNavLayoutBottomOnScreen;
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}
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} else {
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return true;
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}
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}
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} else if (manager instanceof StaggeredGridLayoutManager) {
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StaggeredGridLayoutManager layoutManager = (StaggeredGridLayoutManager) manager;
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int[] out = layoutManager.findLastCompletelyVisibleItemPositions(null);
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int lastPosition = layoutManager.getItemCount() - 1;
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for (int position : out) {
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if (position == lastPosition) {
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return true;
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}
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}
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}
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}
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return false;
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}
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public static void scrollToBottom(final ScrollView scrollView) {
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if (scrollView != null) {
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scrollView.post(new Runnable() {
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@Override
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public void run() {
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scrollView.fullScroll(ScrollView.FOCUS_DOWN);
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}
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});
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}
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}
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public static void scrollToBottom(final AbsListView absListView) {
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if (absListView != null) {
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if (absListView.getAdapter() != null && absListView.getAdapter().getCount() > 0) {
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absListView.post(new Runnable() {
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@Override
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public void run() {
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absListView.setSelection(absListView.getAdapter().getCount() - 1);
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}
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});
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}
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}
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}
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public static void scrollToBottom(final RecyclerView recyclerView) {
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if (recyclerView != null) {
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if (recyclerView.getAdapter() != null && recyclerView.getAdapter().getItemCount() > 0) {
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recyclerView.post(new Runnable() {
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@Override
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public void run() {
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recyclerView.smoothScrollToPosition(recyclerView.getAdapter().getItemCount() - 1);
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}
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});
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}
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}
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}
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public static BGAStickyNavLayout getStickyNavLayout(View view) {
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ViewParent viewParent = view.getParent();
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while (viewParent != null) {
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if (viewParent instanceof BGAStickyNavLayout) {
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return (BGAStickyNavLayout) viewParent;
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}
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viewParent = viewParent.getParent();
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}
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return null;
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}
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public static int getScreenHeight(Context context) {
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WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
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DisplayMetrics dm = new DisplayMetrics();
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windowManager.getDefaultDisplay().getMetrics(dm);
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return dm.heightPixels;
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}
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}
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