ADD week 5
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package androidx.recyclerview.widget;
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import android.content.Context;
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import android.graphics.PointF;
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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.view.animation.LinearInterpolator;
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import androidx.recyclerview.widget.RecyclerView;
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/* loaded from: classes.dex */
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public class LinearSmoothScroller extends RecyclerView.SmoothScroller {
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private static final boolean DEBUG = false;
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private static final float MILLISECONDS_PER_INCH = 25.0f;
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public static final int SNAP_TO_ANY = 0;
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public static final int SNAP_TO_END = 1;
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public static final int SNAP_TO_START = -1;
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private static final float TARGET_SEEK_EXTRA_SCROLL_RATIO = 1.2f;
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private static final int TARGET_SEEK_SCROLL_DISTANCE_PX = 10000;
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private final DisplayMetrics mDisplayMetrics;
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private float mMillisPerPixel;
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protected PointF mTargetVector;
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protected final LinearInterpolator mLinearInterpolator = new LinearInterpolator();
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protected final DecelerateInterpolator mDecelerateInterpolator = new DecelerateInterpolator();
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private boolean mHasCalculatedMillisPerPixel = false;
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protected int mInterimTargetDx = 0;
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protected int mInterimTargetDy = 0;
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private int clampApplyScroll(int i, int i2) {
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int i3 = i - i2;
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if (i * i3 <= 0) {
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return 0;
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}
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return i3;
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}
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@Override // androidx.recyclerview.widget.RecyclerView.SmoothScroller
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protected void onStart() {
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}
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@Override // androidx.recyclerview.widget.RecyclerView.SmoothScroller
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protected void onStop() {
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this.mInterimTargetDy = 0;
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this.mInterimTargetDx = 0;
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this.mTargetVector = null;
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}
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public LinearSmoothScroller(Context context) {
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this.mDisplayMetrics = context.getResources().getDisplayMetrics();
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}
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@Override // androidx.recyclerview.widget.RecyclerView.SmoothScroller
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protected void onTargetFound(View view, RecyclerView.State state, RecyclerView.SmoothScroller.Action action) {
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int calculateDxToMakeVisible = calculateDxToMakeVisible(view, getHorizontalSnapPreference());
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int calculateDyToMakeVisible = calculateDyToMakeVisible(view, getVerticalSnapPreference());
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int calculateTimeForDeceleration = calculateTimeForDeceleration((int) Math.sqrt((calculateDxToMakeVisible * calculateDxToMakeVisible) + (calculateDyToMakeVisible * calculateDyToMakeVisible)));
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if (calculateTimeForDeceleration > 0) {
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action.update(-calculateDxToMakeVisible, -calculateDyToMakeVisible, calculateTimeForDeceleration, this.mDecelerateInterpolator);
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}
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}
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@Override // androidx.recyclerview.widget.RecyclerView.SmoothScroller
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protected void onSeekTargetStep(int i, int i2, RecyclerView.State state, RecyclerView.SmoothScroller.Action action) {
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if (getChildCount() == 0) {
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stop();
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return;
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}
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this.mInterimTargetDx = clampApplyScroll(this.mInterimTargetDx, i);
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int clampApplyScroll = clampApplyScroll(this.mInterimTargetDy, i2);
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this.mInterimTargetDy = clampApplyScroll;
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if (this.mInterimTargetDx == 0 && clampApplyScroll == 0) {
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updateActionForInterimTarget(action);
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}
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}
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protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
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return MILLISECONDS_PER_INCH / displayMetrics.densityDpi;
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}
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private float getSpeedPerPixel() {
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if (!this.mHasCalculatedMillisPerPixel) {
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this.mMillisPerPixel = calculateSpeedPerPixel(this.mDisplayMetrics);
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this.mHasCalculatedMillisPerPixel = true;
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}
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return this.mMillisPerPixel;
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}
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protected int calculateTimeForDeceleration(int i) {
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return (int) Math.ceil(calculateTimeForScrolling(i) / 0.3356d);
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}
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protected int calculateTimeForScrolling(int i) {
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return (int) Math.ceil(Math.abs(i) * getSpeedPerPixel());
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}
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protected int getHorizontalSnapPreference() {
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PointF pointF = this.mTargetVector;
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if (pointF == null || pointF.x == 0.0f) {
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return 0;
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}
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return this.mTargetVector.x > 0.0f ? 1 : -1;
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}
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protected int getVerticalSnapPreference() {
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PointF pointF = this.mTargetVector;
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if (pointF == null || pointF.y == 0.0f) {
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return 0;
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}
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return this.mTargetVector.y > 0.0f ? 1 : -1;
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}
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protected void updateActionForInterimTarget(RecyclerView.SmoothScroller.Action action) {
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PointF computeScrollVectorForPosition = computeScrollVectorForPosition(getTargetPosition());
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if (computeScrollVectorForPosition == null || (computeScrollVectorForPosition.x == 0.0f && computeScrollVectorForPosition.y == 0.0f)) {
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action.jumpTo(getTargetPosition());
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stop();
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return;
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}
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normalize(computeScrollVectorForPosition);
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this.mTargetVector = computeScrollVectorForPosition;
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this.mInterimTargetDx = (int) (computeScrollVectorForPosition.x * 10000.0f);
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this.mInterimTargetDy = (int) (computeScrollVectorForPosition.y * 10000.0f);
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action.update((int) (this.mInterimTargetDx * TARGET_SEEK_EXTRA_SCROLL_RATIO), (int) (this.mInterimTargetDy * TARGET_SEEK_EXTRA_SCROLL_RATIO), (int) (calculateTimeForScrolling(TARGET_SEEK_SCROLL_DISTANCE_PX) * TARGET_SEEK_EXTRA_SCROLL_RATIO), this.mLinearInterpolator);
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}
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public int calculateDtToFit(int i, int i2, int i3, int i4, int i5) {
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if (i5 == -1) {
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return i3 - i;
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}
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if (i5 != 0) {
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if (i5 == 1) {
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return i4 - i2;
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}
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throw new IllegalArgumentException("snap preference should be one of the constants defined in SmoothScroller, starting with SNAP_");
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}
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int i6 = i3 - i;
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if (i6 > 0) {
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return i6;
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}
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int i7 = i4 - i2;
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if (i7 < 0) {
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return i7;
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}
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return 0;
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}
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public int calculateDyToMakeVisible(View view, int i) {
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RecyclerView.LayoutManager layoutManager = getLayoutManager();
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if (layoutManager == null || !layoutManager.canScrollVertically()) {
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return 0;
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}
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RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) view.getLayoutParams();
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return calculateDtToFit(layoutManager.getDecoratedTop(view) - layoutParams.topMargin, layoutManager.getDecoratedBottom(view) + layoutParams.bottomMargin, layoutManager.getPaddingTop(), layoutManager.getHeight() - layoutManager.getPaddingBottom(), i);
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}
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public int calculateDxToMakeVisible(View view, int i) {
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RecyclerView.LayoutManager layoutManager = getLayoutManager();
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if (layoutManager == null || !layoutManager.canScrollHorizontally()) {
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return 0;
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}
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RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) view.getLayoutParams();
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return calculateDtToFit(layoutManager.getDecoratedLeft(view) - layoutParams.leftMargin, layoutManager.getDecoratedRight(view) + layoutParams.rightMargin, layoutManager.getPaddingLeft(), layoutManager.getWidth() - layoutManager.getPaddingRight(), i);
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}
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}
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