SRE/02-Easy5/E5/sources/androidx/recyclerview/widget/SnapHelper.java

package androidx.recyclerview.widget;

import android.util.DisplayMetrics;
import android.view.View;
import android.view.animation.DecelerateInterpolator;
import android.widget.Scroller;
import androidx.recyclerview.widget.RecyclerView;

/* loaded from: classes.dex */
public abstract class SnapHelper extends RecyclerView.OnFlingListener {
    static final float MILLISECONDS_PER_INCH = 100.0f;
    private Scroller mGravityScroller;
    RecyclerView mRecyclerView;
    private final RecyclerView.OnScrollListener mScrollListener = new RecyclerView.OnScrollListener() { // from class: androidx.recyclerview.widget.SnapHelper.1
        boolean mScrolled = false;

        @Override // androidx.recyclerview.widget.RecyclerView.OnScrollListener
        public void onScrolled(RecyclerView recyclerView, int i, int i2) {
            if (i == 0 && i2 == 0) {
                return;
            }
            this.mScrolled = true;
        }

        @Override // androidx.recyclerview.widget.RecyclerView.OnScrollListener
        public void onScrollStateChanged(RecyclerView recyclerView, int i) {
            super.onScrollStateChanged(recyclerView, i);
            if (i == 0 && this.mScrolled) {
                this.mScrolled = false;
                SnapHelper.this.snapToTargetExistingView();
            }
        }
    };

    public abstract int[] calculateDistanceToFinalSnap(RecyclerView.LayoutManager layoutManager, View view);

    public abstract View findSnapView(RecyclerView.LayoutManager layoutManager);

    public abstract int findTargetSnapPosition(RecyclerView.LayoutManager layoutManager, int i, int i2);

    @Override // androidx.recyclerview.widget.RecyclerView.OnFlingListener
    public boolean onFling(int i, int i2) {
        RecyclerView.LayoutManager layoutManager = this.mRecyclerView.getLayoutManager();
        if (layoutManager == null || this.mRecyclerView.getAdapter() == null) {
            return false;
        }
        int minFlingVelocity = this.mRecyclerView.getMinFlingVelocity();
        return (Math.abs(i2) > minFlingVelocity || Math.abs(i) > minFlingVelocity) && snapFromFling(layoutManager, i, i2);
    }

    public void attachToRecyclerView(RecyclerView recyclerView) throws IllegalStateException {
        RecyclerView recyclerView2 = this.mRecyclerView;
        if (recyclerView2 == recyclerView) {
            return;
        }
        if (recyclerView2 != null) {
            destroyCallbacks();
        }
        this.mRecyclerView = recyclerView;
        if (recyclerView != null) {
            setupCallbacks();
            this.mGravityScroller = new Scroller(this.mRecyclerView.getContext(), new DecelerateInterpolator());
            snapToTargetExistingView();
        }
    }

    private void setupCallbacks() throws IllegalStateException {
        if (this.mRecyclerView.getOnFlingListener() != null) {
            throw new IllegalStateException("An instance of OnFlingListener already set.");
        }
        this.mRecyclerView.addOnScrollListener(this.mScrollListener);
        this.mRecyclerView.setOnFlingListener(this);
    }

    private void destroyCallbacks() {
        this.mRecyclerView.removeOnScrollListener(this.mScrollListener);
        this.mRecyclerView.setOnFlingListener(null);
    }

    public int[] calculateScrollDistance(int i, int i2) {
        this.mGravityScroller.fling(0, 0, i, i2, Integer.MIN_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE, Integer.MAX_VALUE);
        return new int[]{this.mGravityScroller.getFinalX(), this.mGravityScroller.getFinalY()};
    }

    private boolean snapFromFling(RecyclerView.LayoutManager layoutManager, int i, int i2) {
        RecyclerView.SmoothScroller createScroller;
        int findTargetSnapPosition;
        if (!(layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider) || (createScroller = createScroller(layoutManager)) == null || (findTargetSnapPosition = findTargetSnapPosition(layoutManager, i, i2)) == -1) {
            return false;
        }
        createScroller.setTargetPosition(findTargetSnapPosition);
        layoutManager.startSmoothScroll(createScroller);
        return true;
    }

    void snapToTargetExistingView() {
        RecyclerView.LayoutManager layoutManager;
        View findSnapView;
        RecyclerView recyclerView = this.mRecyclerView;
        if (recyclerView == null || (layoutManager = recyclerView.getLayoutManager()) == null || (findSnapView = findSnapView(layoutManager)) == null) {
            return;
        }
        int[] calculateDistanceToFinalSnap = calculateDistanceToFinalSnap(layoutManager, findSnapView);
        int i = calculateDistanceToFinalSnap[0];
        if (i == 0 && calculateDistanceToFinalSnap[1] == 0) {
            return;
        }
        this.mRecyclerView.smoothScrollBy(i, calculateDistanceToFinalSnap[1]);
    }

    protected RecyclerView.SmoothScroller createScroller(RecyclerView.LayoutManager layoutManager) {
        return createSnapScroller(layoutManager);
    }

    @Deprecated
    protected LinearSmoothScroller createSnapScroller(RecyclerView.LayoutManager layoutManager) {
        if (layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider) {
            return new LinearSmoothScroller(this.mRecyclerView.getContext()) { // from class: androidx.recyclerview.widget.SnapHelper.2
                @Override // androidx.recyclerview.widget.LinearSmoothScroller, androidx.recyclerview.widget.RecyclerView.SmoothScroller
                protected void onTargetFound(View view, RecyclerView.State state, RecyclerView.SmoothScroller.Action action) {
                    if (SnapHelper.this.mRecyclerView == null) {
                        return;
                    }
                    SnapHelper snapHelper = SnapHelper.this;
                    int[] calculateDistanceToFinalSnap = snapHelper.calculateDistanceToFinalSnap(snapHelper.mRecyclerView.getLayoutManager(), view);
                    int i = calculateDistanceToFinalSnap[0];
                    int i2 = calculateDistanceToFinalSnap[1];
                    int calculateTimeForDeceleration = calculateTimeForDeceleration(Math.max(Math.abs(i), Math.abs(i2)));
                    if (calculateTimeForDeceleration > 0) {
                        action.update(i, i2, calculateTimeForDeceleration, this.mDecelerateInterpolator);
                    }
                }

                @Override // androidx.recyclerview.widget.LinearSmoothScroller
                protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
                    return SnapHelper.MILLISECONDS_PER_INCH / displayMetrics.densityDpi;
                }
            };
        }
        return null;
    }
}