66 lines
2.4 KiB
Java
66 lines
2.4 KiB
Java
package com.xscm.moduleutil.widget;
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import android.view.View;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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public class InfintLinearLayoutManager extends LinearLayoutManager {
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public InfintLinearLayoutManager(RecyclerView recyclerView) {
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super(recyclerView.getContext(), HORIZONTAL, false);
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}
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@Override
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public boolean canScrollHorizontally() {
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return true; // 允许水平滑动
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}
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@Override
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public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {
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return super.scrollVerticallyBy(dy, recycler, state);
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}
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@Override
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public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, RecyclerView.State state) {
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// 获取最后一个和第一个可见 item 的位置
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int first = findFirstVisibleItemPosition();
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int last = findLastVisibleItemPosition();
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if (first == 0 && dx > 0) {
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// 滑动到了最左边，现在往右滑，把最后一个 item 移动到前面复用
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View lastView = getChildAt(last);
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if (lastView != null) {
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layoutScrapView(lastView, last, -1);
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offsetChildrenHorizontal(-getDecoratedMeasuredWidth(lastView));
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return dx;
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}
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} else if (last == getItemCount() - 1 && dx < 0) {
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// 滑动到了最右边，现在往左滑，把第一个 item 移动到最后面复用
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View firstView = getChildAt(first);
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if (firstView != null) {
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layoutScrapView(firstView, first, +1);
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offsetChildrenHorizontal(+getDecoratedMeasuredWidth(firstView));
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return dx;
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}
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}
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return super.scrollHorizontallyBy(dx, recycler, state);
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}
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private void layoutScrapView(View view, int position, int direction) {
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removeView(view);
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// 复用的 item 设置为新的位置
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int newPosition = direction > 0 ? getItemCount() - 1 : 0;
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addView(view, direction > 0 ? getChildCount() : 0);
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// 更新 adapter 的 position
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RecyclerView.LayoutParams lp = (RecyclerView.LayoutParams) view.getLayoutParams();
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layoutDecoratedWithMargins(view,
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0,
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0,
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getDecoratedMeasuredWidth(view),
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getDecoratedMeasuredHeight(view));
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}
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}
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