ADD week 5

02-Easy5/E5/sources/com/google/android/material/carousel/CarouselSnapHelper.java

@@ -0,0 +1,166 @@
+package com.google.android.material.carousel;
+
+import android.graphics.PointF;
+import android.util.DisplayMetrics;
+import android.view.View;
+import androidx.recyclerview.widget.LinearSmoothScroller;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.SnapHelper;
+
+/* loaded from: classes.dex */
+public class CarouselSnapHelper extends SnapHelper {
+    private static final float HORIZONTAL_SNAP_SPEED = 100.0f;
+    private static final float VERTICAL_SNAP_SPEED = 50.0f;
+    private final boolean disableFling;
+    private RecyclerView recyclerView;
+
+    public CarouselSnapHelper() {
+        this(true);
+    }
+
+    public CarouselSnapHelper(boolean z) {
+        this.disableFling = z;
+    }
+
+    @Override // androidx.recyclerview.widget.SnapHelper
+    public void attachToRecyclerView(RecyclerView recyclerView) {
+        super.attachToRecyclerView(recyclerView);
+        this.recyclerView = recyclerView;
+    }
+
+    @Override // androidx.recyclerview.widget.SnapHelper
+    public int[] calculateDistanceToFinalSnap(RecyclerView.LayoutManager layoutManager, View view) {
+        return calculateDistanceToSnap(layoutManager, view, false);
+    }
+
+    /* JADX INFO: Access modifiers changed from: private */
+    public int[] calculateDistanceToSnap(RecyclerView.LayoutManager layoutManager, View view, boolean z) {
+        if (!(layoutManager instanceof CarouselLayoutManager)) {
+            return new int[]{0, 0};
+        }
+        int distanceToFirstFocalKeyline = distanceToFirstFocalKeyline(view, (CarouselLayoutManager) layoutManager, z);
+        return layoutManager.canScrollHorizontally() ? new int[]{distanceToFirstFocalKeyline, 0} : layoutManager.canScrollVertically() ? new int[]{0, distanceToFirstFocalKeyline} : new int[]{0, 0};
+    }
+
+    private int distanceToFirstFocalKeyline(View view, CarouselLayoutManager carouselLayoutManager, boolean z) {
+        return carouselLayoutManager.getOffsetToScrollToPositionForSnap(carouselLayoutManager.getPosition(view), z);
+    }
+
+    @Override // androidx.recyclerview.widget.SnapHelper
+    public View findSnapView(RecyclerView.LayoutManager layoutManager) {
+        return findViewNearestFirstKeyline(layoutManager);
+    }
+
+    private View findViewNearestFirstKeyline(RecyclerView.LayoutManager layoutManager) {
+        int childCount = layoutManager.getChildCount();
+        View view = null;
+        if (childCount != 0 && (layoutManager instanceof CarouselLayoutManager)) {
+            CarouselLayoutManager carouselLayoutManager = (CarouselLayoutManager) layoutManager;
+            int i = Integer.MAX_VALUE;
+            for (int i2 = 0; i2 < childCount; i2++) {
+                View childAt = layoutManager.getChildAt(i2);
+                int abs = Math.abs(carouselLayoutManager.getOffsetToScrollToPositionForSnap(layoutManager.getPosition(childAt), false));
+                if (abs < i) {
+                    view = childAt;
+                    i = abs;
+                }
+            }
+        }
+        return view;
+    }
+
+    @Override // androidx.recyclerview.widget.SnapHelper
+    public int findTargetSnapPosition(RecyclerView.LayoutManager layoutManager, int i, int i2) {
+        int itemCount;
+        if (!this.disableFling || (itemCount = layoutManager.getItemCount()) == 0) {
+            return -1;
+        }
+        int childCount = layoutManager.getChildCount();
+        View view = null;
+        View view2 = null;
+        int i3 = Integer.MIN_VALUE;
+        int i4 = Integer.MAX_VALUE;
+        for (int i5 = 0; i5 < childCount; i5++) {
+            View childAt = layoutManager.getChildAt(i5);
+            if (childAt != null) {
+                int distanceToFirstFocalKeyline = distanceToFirstFocalKeyline(childAt, (CarouselLayoutManager) layoutManager, false);
+                if (distanceToFirstFocalKeyline <= 0 && distanceToFirstFocalKeyline > i3) {
+                    view2 = childAt;
+                    i3 = distanceToFirstFocalKeyline;
+                }
+                if (distanceToFirstFocalKeyline >= 0 && distanceToFirstFocalKeyline < i4) {
+                    view = childAt;
+                    i4 = distanceToFirstFocalKeyline;
+                }
+            }
+        }
+        boolean isForwardFling = isForwardFling(layoutManager, i, i2);
+        if (isForwardFling && view != null) {
+            return layoutManager.getPosition(view);
+        }
+        if (!isForwardFling && view2 != null) {
+            return layoutManager.getPosition(view2);
+        }
+        if (isForwardFling) {
+            view = view2;
+        }
+        if (view == null) {
+            return -1;
+        }
+        int position = layoutManager.getPosition(view) + (isReverseLayout(layoutManager) == isForwardFling ? -1 : 1);
+        if (position < 0 || position >= itemCount) {
+            return -1;
+        }
+        return position;
+    }
+
+    private boolean isForwardFling(RecyclerView.LayoutManager layoutManager, int i, int i2) {
+        return layoutManager.canScrollHorizontally() ? i > 0 : i2 > 0;
+    }
+
+    /* JADX WARN: Multi-variable type inference failed */
+    private boolean isReverseLayout(RecyclerView.LayoutManager layoutManager) {
+        PointF computeScrollVectorForPosition;
+        int itemCount = layoutManager.getItemCount();
+        if (!(layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider) || (computeScrollVectorForPosition = ((RecyclerView.SmoothScroller.ScrollVectorProvider) layoutManager).computeScrollVectorForPosition(itemCount - 1)) == null) {
+            return false;
+        }
+        return computeScrollVectorForPosition.x < 0.0f || computeScrollVectorForPosition.y < 0.0f;
+    }
+
+    @Override // androidx.recyclerview.widget.SnapHelper
+    protected RecyclerView.SmoothScroller createScroller(final RecyclerView.LayoutManager layoutManager) {
+        if (layoutManager instanceof RecyclerView.SmoothScroller.ScrollVectorProvider) {
+            return new LinearSmoothScroller(this.recyclerView.getContext()) { // from class: com.google.android.material.carousel.CarouselSnapHelper.1
+                @Override // androidx.recyclerview.widget.LinearSmoothScroller, androidx.recyclerview.widget.RecyclerView.SmoothScroller
+                protected void onTargetFound(View view, RecyclerView.State state, RecyclerView.SmoothScroller.Action action) {
+                    if (CarouselSnapHelper.this.recyclerView != null) {
+                        CarouselSnapHelper carouselSnapHelper = CarouselSnapHelper.this;
+                        int[] calculateDistanceToSnap = carouselSnapHelper.calculateDistanceToSnap(carouselSnapHelper.recyclerView.getLayoutManager(), view, true);
+                        int i = calculateDistanceToSnap[0];
+                        int i2 = calculateDistanceToSnap[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) {
+                    float f;
+                    float f2;
+                    if (layoutManager.canScrollVertically()) {
+                        f = displayMetrics.densityDpi;
+                        f2 = 50.0f;
+                    } else {
+                        f = displayMetrics.densityDpi;
+                        f2 = CarouselSnapHelper.HORIZONTAL_SNAP_SPEED;
+                    }
+                    return f2 / f;
+                }
+            };
+        }
+        return null;
+    }
+}