97 lines
3.0 KiB
Java
97 lines
3.0 KiB
Java
package com.topjohnwu.magisk.adapters;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.recyclerview.widget.RecyclerView;
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public abstract class SectionedAdapter<S extends RecyclerView.ViewHolder, C extends RecyclerView.ViewHolder>
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extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
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private static final int SECTION_TYPE = Integer.MIN_VALUE;
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@NonNull
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@Override
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final public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
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if (viewType == SECTION_TYPE)
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return onCreateSectionViewHolder(parent);
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return onCreateItemViewHolder(parent, viewType);
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}
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@Override
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@SuppressWarnings("unchecked")
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final public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
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PositionInfo info = getPositionInfo(position);
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if (info.position == -1)
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onBindSectionViewHolder((S) holder, info.section);
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else
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onBindItemViewHolder((C) holder, info.section, info.position);
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}
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@Override
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final public int getItemCount() {
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int size, sec;
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size = sec = getSectionCount();
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for (int i = 0; i < sec; ++i){
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size += getItemCount(i);
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}
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return size;
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}
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@Override
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final public int getItemViewType(int position) {
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PositionInfo info = getPositionInfo(position);
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if (info.position == -1)
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return SECTION_TYPE;
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else
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return getItemViewType(info.section, info.position);
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}
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public int getItemViewType(int section, int position) {
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return 0;
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}
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protected int getSectionPosition(int section) {
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return getItemPosition(section, -1);
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}
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protected int getItemPosition(int section, int position) {
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int realPosition = 0;
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// Previous sections
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for (int i = 0; i < section; ++i) {
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realPosition += getItemCount(i) + 1;
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}
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// Current section
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realPosition += position + 1;
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return realPosition;
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}
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private PositionInfo getPositionInfo(int position) {
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int section = 0;
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while (true) {
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if (position == 0)
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return new PositionInfo(section, -1);
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position -= 1;
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if (position < getItemCount(section))
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return new PositionInfo(section, position);
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position -= getItemCount(section++);
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}
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}
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private static class PositionInfo {
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int section;
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int position;
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PositionInfo(int section, int position) {
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this.section = section;
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this.position = position;
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}
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}
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public abstract int getSectionCount();
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public abstract int getItemCount(int section);
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public abstract S onCreateSectionViewHolder(ViewGroup parent);
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public abstract C onCreateItemViewHolder(ViewGroup parent, int viewType);
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public abstract void onBindSectionViewHolder(S holder, int section);
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public abstract void onBindItemViewHolder(C holder, int section, int position);
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}
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