325 lines
9.6 KiB
Java
325 lines
9.6 KiB
Java
package androidx.recyclerview.widget;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.recyclerview.widget.RecyclerView;
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import java.util.ArrayList;
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import java.util.List;
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public class ChildHelper {
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private static final boolean DEBUG = false;
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private static final String TAG = "ChildrenHelper";
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public final Bucket mBucket = new Bucket();
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public final Callback mCallback;
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public final List<View> mHiddenViews = new ArrayList();
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public static class Bucket {
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public static final int BITS_PER_WORD = 64;
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public static final long LAST_BIT = Long.MIN_VALUE;
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public long mData = 0;
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public Bucket mNext;
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private void ensureNext() {
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if (this.mNext == null) {
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this.mNext = new Bucket();
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}
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}
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public void clear(int i) {
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if (i >= 64) {
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Bucket bucket = this.mNext;
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if (bucket != null) {
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bucket.clear(i - 64);
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return;
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}
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return;
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}
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this.mData &= ~(1 << i);
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}
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public int countOnesBefore(int i) {
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Bucket bucket = this.mNext;
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if (bucket == null) {
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return i >= 64 ? Long.bitCount(this.mData) : Long.bitCount(this.mData & ((1 << i) - 1));
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}
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if (i < 64) {
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return Long.bitCount(this.mData & ((1 << i) - 1));
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}
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return Long.bitCount(this.mData) + bucket.countOnesBefore(i - 64);
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}
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public boolean get(int i) {
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if (i < 64) {
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return (this.mData & (1 << i)) != 0;
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}
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ensureNext();
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return this.mNext.get(i - 64);
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}
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public void insert(int i, boolean z2) {
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if (i >= 64) {
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ensureNext();
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this.mNext.insert(i - 64, z2);
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return;
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}
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long j = this.mData;
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boolean z3 = (Long.MIN_VALUE & j) != 0;
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long j2 = (1 << i) - 1;
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this.mData = ((j & (~j2)) << 1) | (j & j2);
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if (z2) {
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set(i);
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} else {
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clear(i);
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}
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if (z3 || this.mNext != null) {
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ensureNext();
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this.mNext.insert(0, z3);
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}
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}
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public boolean remove(int i) {
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if (i >= 64) {
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ensureNext();
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return this.mNext.remove(i - 64);
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}
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long j = 1 << i;
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long j2 = this.mData;
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boolean z2 = (j2 & j) != 0;
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long j3 = j2 & (~j);
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this.mData = j3;
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long j4 = j - 1;
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this.mData = (j3 & j4) | Long.rotateRight((~j4) & j3, 1);
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Bucket bucket = this.mNext;
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if (bucket != null) {
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if (bucket.get(0)) {
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set(63);
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}
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this.mNext.remove(0);
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}
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return z2;
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}
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public void reset() {
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this.mData = 0;
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Bucket bucket = this.mNext;
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if (bucket != null) {
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bucket.reset();
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}
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}
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public void set(int i) {
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if (i >= 64) {
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ensureNext();
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this.mNext.set(i - 64);
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return;
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}
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this.mData |= 1 << i;
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}
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public String toString() {
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if (this.mNext == null) {
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return Long.toBinaryString(this.mData);
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}
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return this.mNext.toString() + "xx" + Long.toBinaryString(this.mData);
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}
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}
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public interface Callback {
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void addView(View view, int i);
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void attachViewToParent(View view, int i, ViewGroup.LayoutParams layoutParams);
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void detachViewFromParent(int i);
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View getChildAt(int i);
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int getChildCount();
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RecyclerView.ViewHolder getChildViewHolder(View view);
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int indexOfChild(View view);
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void onEnteredHiddenState(View view);
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void onLeftHiddenState(View view);
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void removeAllViews();
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void removeViewAt(int i);
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}
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public ChildHelper(Callback callback) {
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this.mCallback = callback;
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}
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private int getOffset(int i) {
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if (i < 0) {
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return -1;
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}
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int childCount = this.mCallback.getChildCount();
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int i2 = i;
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while (i2 < childCount) {
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int countOnesBefore = i - (i2 - this.mBucket.countOnesBefore(i2));
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if (countOnesBefore == 0) {
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while (this.mBucket.get(i2)) {
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i2++;
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}
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return i2;
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}
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i2 += countOnesBefore;
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}
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return -1;
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}
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private void hideViewInternal(View view) {
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this.mHiddenViews.add(view);
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this.mCallback.onEnteredHiddenState(view);
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}
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private boolean unhideViewInternal(View view) {
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if (!this.mHiddenViews.remove(view)) {
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return false;
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}
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this.mCallback.onLeftHiddenState(view);
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return true;
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}
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public void addView(View view, int i, boolean z2) {
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int childCount = i < 0 ? this.mCallback.getChildCount() : getOffset(i);
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this.mBucket.insert(childCount, z2);
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if (z2) {
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hideViewInternal(view);
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}
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this.mCallback.addView(view, childCount);
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}
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public void addView(View view, boolean z2) {
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addView(view, -1, z2);
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}
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public void attachViewToParent(View view, int i, ViewGroup.LayoutParams layoutParams, boolean z2) {
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int childCount = i < 0 ? this.mCallback.getChildCount() : getOffset(i);
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this.mBucket.insert(childCount, z2);
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if (z2) {
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hideViewInternal(view);
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}
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this.mCallback.attachViewToParent(view, childCount, layoutParams);
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}
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public void detachViewFromParent(int i) {
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int offset = getOffset(i);
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this.mBucket.remove(offset);
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this.mCallback.detachViewFromParent(offset);
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}
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public View findHiddenNonRemovedView(int i) {
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int size = this.mHiddenViews.size();
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for (int i2 = 0; i2 < size; i2++) {
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View view = this.mHiddenViews.get(i2);
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RecyclerView.ViewHolder childViewHolder = this.mCallback.getChildViewHolder(view);
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if (!(childViewHolder.getLayoutPosition() != i || childViewHolder.isInvalid() || childViewHolder.isRemoved())) {
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return view;
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}
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}
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return null;
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}
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public View getChildAt(int i) {
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return this.mCallback.getChildAt(getOffset(i));
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}
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public int getChildCount() {
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return this.mCallback.getChildCount() - this.mHiddenViews.size();
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}
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public View getUnfilteredChildAt(int i) {
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return this.mCallback.getChildAt(i);
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}
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public int getUnfilteredChildCount() {
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return this.mCallback.getChildCount();
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}
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public void hide(View view) {
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int indexOfChild = this.mCallback.indexOfChild(view);
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if (indexOfChild >= 0) {
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this.mBucket.set(indexOfChild);
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hideViewInternal(view);
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return;
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}
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throw new IllegalArgumentException("view is not a child, cannot hide " + view);
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}
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public int indexOfChild(View view) {
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int indexOfChild = this.mCallback.indexOfChild(view);
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if (indexOfChild != -1 && !this.mBucket.get(indexOfChild)) {
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return indexOfChild - this.mBucket.countOnesBefore(indexOfChild);
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}
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return -1;
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}
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public boolean isHidden(View view) {
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return this.mHiddenViews.contains(view);
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}
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public void removeAllViewsUnfiltered() {
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this.mBucket.reset();
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for (int size = this.mHiddenViews.size() - 1; size >= 0; size--) {
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this.mCallback.onLeftHiddenState(this.mHiddenViews.get(size));
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this.mHiddenViews.remove(size);
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}
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this.mCallback.removeAllViews();
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}
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public void removeView(View view) {
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int indexOfChild = this.mCallback.indexOfChild(view);
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if (indexOfChild >= 0) {
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if (this.mBucket.remove(indexOfChild)) {
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unhideViewInternal(view);
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}
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this.mCallback.removeViewAt(indexOfChild);
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}
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}
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public void removeViewAt(int i) {
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int offset = getOffset(i);
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View childAt = this.mCallback.getChildAt(offset);
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if (childAt != null) {
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if (this.mBucket.remove(offset)) {
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unhideViewInternal(childAt);
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}
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this.mCallback.removeViewAt(offset);
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}
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}
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public boolean removeViewIfHidden(View view) {
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int indexOfChild = this.mCallback.indexOfChild(view);
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if (indexOfChild == -1) {
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unhideViewInternal(view);
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return true;
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} else if (!this.mBucket.get(indexOfChild)) {
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return false;
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} else {
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this.mBucket.remove(indexOfChild);
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unhideViewInternal(view);
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this.mCallback.removeViewAt(indexOfChild);
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return true;
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}
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}
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public String toString() {
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return this.mBucket.toString() + ", hidden list:" + this.mHiddenViews.size();
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}
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public void unhide(View view) {
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int indexOfChild = this.mCallback.indexOfChild(view);
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if (indexOfChild < 0) {
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throw new IllegalArgumentException("view is not a child, cannot hide " + view);
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} else if (this.mBucket.get(indexOfChild)) {
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this.mBucket.clear(indexOfChild);
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unhideViewInternal(view);
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} else {
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throw new RuntimeException("trying to unhide a view that was not hidden" + view);
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}
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}
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}
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