157 lines
6.9 KiB
Java
157 lines
6.9 KiB
Java
package androidx.recyclerview.widget;
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import android.content.Context;
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import android.util.DisplayMetrics;
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import android.view.View;
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import android.view.animation.DecelerateInterpolator;
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import android.widget.Scroller;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.recyclerview.widget.RecyclerView;
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public abstract class SnapHelper extends RecyclerView.OnFlingListener {
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public static final float MILLISECONDS_PER_INCH = 100.0f;
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private Scroller mGravityScroller;
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public RecyclerView mRecyclerView;
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private final RecyclerView.OnScrollListener mScrollListener = new AnonymousClass1();
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/* renamed from: androidx.recyclerview.widget.SnapHelper$1 reason: invalid class name */
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public class AnonymousClass1 extends RecyclerView.OnScrollListener {
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public boolean mScrolled = false;
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public AnonymousClass1() {
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}
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@Override // androidx.recyclerview.widget.RecyclerView.OnScrollListener
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public void onScrollStateChanged(RecyclerView recyclerView, int i) {
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super.onScrollStateChanged(recyclerView, i);
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if (i == 0 && this.mScrolled) {
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this.mScrolled = false;
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SnapHelper.this.snapToTargetExistingView();
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}
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}
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@Override // androidx.recyclerview.widget.RecyclerView.OnScrollListener
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public void onScrolled(RecyclerView recyclerView, int i, int i2) {
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if (i != 0 || i2 != 0) {
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this.mScrolled = true;
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}
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}
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}
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/* renamed from: androidx.recyclerview.widget.SnapHelper$2 reason: invalid class name */
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public class AnonymousClass2 extends LinearSmoothScroller {
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public AnonymousClass2(Context context) {
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super(context);
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}
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@Override // androidx.recyclerview.widget.LinearSmoothScroller
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public float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
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return 100.0f / ((float) displayMetrics.densityDpi);
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}
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@Override // androidx.recyclerview.widget.LinearSmoothScroller, androidx.recyclerview.widget.RecyclerView.SmoothScroller
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public void onTargetFound(View view, RecyclerView.State state, RecyclerView.SmoothScroller.Action action) {
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SnapHelper snapHelper = SnapHelper.this;
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RecyclerView recyclerView = snapHelper.mRecyclerView;
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if (recyclerView != null) {
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int[] calculateDistanceToFinalSnap = snapHelper.calculateDistanceToFinalSnap(recyclerView.getLayoutManager(), view);
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int i = calculateDistanceToFinalSnap[0];
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int i2 = calculateDistanceToFinalSnap[1];
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int calculateTimeForDeceleration = calculateTimeForDeceleration(Math.max(Math.abs(i), Math.abs(i2)));
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if (calculateTimeForDeceleration > 0) {
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action.update(i, i2, calculateTimeForDeceleration, this.mDecelerateInterpolator);
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}
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}
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}
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}
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private void destroyCallbacks() {
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this.mRecyclerView.removeOnScrollListener(this.mScrollListener);
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this.mRecyclerView.setOnFlingListener(null);
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}
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private void setupCallbacks() throws IllegalStateException {
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if (this.mRecyclerView.getOnFlingListener() == null) {
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this.mRecyclerView.addOnScrollListener(this.mScrollListener);
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this.mRecyclerView.setOnFlingListener(this);
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return;
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}
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throw new IllegalStateException("An instance of OnFlingListener already set.");
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}
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private boolean snapFromFling(@NonNull RecyclerView.LayoutManager layoutManager, int i, int i2) {
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RecyclerView.SmoothScroller createScroller;
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int findTargetSnapPosition;
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if (!(layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider) || (createScroller = createScroller(layoutManager)) == null || (findTargetSnapPosition = findTargetSnapPosition(layoutManager, i, i2)) == -1) {
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return false;
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}
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createScroller.setTargetPosition(findTargetSnapPosition);
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layoutManager.startSmoothScroll(createScroller);
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return true;
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}
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public void attachToRecyclerView(@Nullable RecyclerView recyclerView) throws IllegalStateException {
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RecyclerView recyclerView2 = this.mRecyclerView;
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if (recyclerView2 != recyclerView) {
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if (recyclerView2 != null) {
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destroyCallbacks();
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}
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this.mRecyclerView = recyclerView;
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if (recyclerView != null) {
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setupCallbacks();
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this.mGravityScroller = new Scroller(this.mRecyclerView.getContext(), new DecelerateInterpolator());
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snapToTargetExistingView();
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}
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}
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}
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@Nullable
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public abstract int[] calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager, @NonNull View view);
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public int[] calculateScrollDistance(int i, int i2) {
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this.mGravityScroller.fling(0, 0, i, i2, Integer.MIN_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE, Integer.MAX_VALUE);
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return new int[]{this.mGravityScroller.getFinalX(), this.mGravityScroller.getFinalY()};
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}
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@Nullable
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public RecyclerView.SmoothScroller createScroller(RecyclerView.LayoutManager layoutManager) {
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return createSnapScroller(layoutManager);
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}
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@Nullable
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@Deprecated
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public LinearSmoothScroller createSnapScroller(RecyclerView.LayoutManager layoutManager) {
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if (!(layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider)) {
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return null;
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}
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return new AnonymousClass2(this.mRecyclerView.getContext());
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}
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@Nullable
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public abstract View findSnapView(RecyclerView.LayoutManager layoutManager);
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public abstract int findTargetSnapPosition(RecyclerView.LayoutManager layoutManager, int i, int i2);
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@Override // androidx.recyclerview.widget.RecyclerView.OnFlingListener
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public boolean onFling(int i, int i2) {
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RecyclerView.LayoutManager layoutManager = this.mRecyclerView.getLayoutManager();
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if (layoutManager == null || this.mRecyclerView.getAdapter() == null) {
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return false;
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}
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int minFlingVelocity = this.mRecyclerView.getMinFlingVelocity();
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return (Math.abs(i2) > minFlingVelocity || Math.abs(i) > minFlingVelocity) && snapFromFling(layoutManager, i, i2);
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}
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public void snapToTargetExistingView() {
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RecyclerView.LayoutManager layoutManager;
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View findSnapView;
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RecyclerView recyclerView = this.mRecyclerView;
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if (recyclerView != null && (layoutManager = recyclerView.getLayoutManager()) != null && (findSnapView = findSnapView(layoutManager)) != null) {
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int[] calculateDistanceToFinalSnap = calculateDistanceToFinalSnap(layoutManager, findSnapView);
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if (calculateDistanceToFinalSnap[0] != 0 || calculateDistanceToFinalSnap[1] != 0) {
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this.mRecyclerView.smoothScrollBy(calculateDistanceToFinalSnap[0], calculateDistanceToFinalSnap[1]);
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}
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}
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}
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}
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