ADD week 5

02-Easy5/E5/sources/com/google/android/material/shape/InterpolateOnScrollPositionChangeHelper.java

@@ -0,0 +1,69 @@
+package com.google.android.material.shape;
+
+import android.view.View;
+import android.view.ViewTreeObserver;
+import android.widget.ScrollView;
+
+/* loaded from: classes.dex */
+public class InterpolateOnScrollPositionChangeHelper {
+    private ScrollView containingScrollView;
+    private MaterialShapeDrawable materialShapeDrawable;
+    private View shapedView;
+    private final int[] scrollLocation = new int[2];
+    private final int[] containerLocation = new int[2];
+    private final ViewTreeObserver.OnScrollChangedListener scrollChangedListener = new ViewTreeObserver.OnScrollChangedListener() { // from class: com.google.android.material.shape.InterpolateOnScrollPositionChangeHelper.1
+        @Override // android.view.ViewTreeObserver.OnScrollChangedListener
+        public void onScrollChanged() {
+            InterpolateOnScrollPositionChangeHelper.this.updateInterpolationForScreenPosition();
+        }
+    };
+
+    public void setContainingScrollView(ScrollView scrollView) {
+        this.containingScrollView = scrollView;
+    }
+
+    public void setMaterialShapeDrawable(MaterialShapeDrawable materialShapeDrawable) {
+        this.materialShapeDrawable = materialShapeDrawable;
+    }
+
+    public InterpolateOnScrollPositionChangeHelper(View view, MaterialShapeDrawable materialShapeDrawable, ScrollView scrollView) {
+        this.shapedView = view;
+        this.materialShapeDrawable = materialShapeDrawable;
+        this.containingScrollView = scrollView;
+    }
+
+    public void startListeningForScrollChanges(ViewTreeObserver viewTreeObserver) {
+        viewTreeObserver.addOnScrollChangedListener(this.scrollChangedListener);
+    }
+
+    public void stopListeningForScrollChanges(ViewTreeObserver viewTreeObserver) {
+        viewTreeObserver.removeOnScrollChangedListener(this.scrollChangedListener);
+    }
+
+    public void updateInterpolationForScreenPosition() {
+        ScrollView scrollView = this.containingScrollView;
+        if (scrollView == null) {
+            return;
+        }
+        if (scrollView.getChildCount() == 0) {
+            throw new IllegalStateException("Scroll bar must contain a child to calculate interpolation.");
+        }
+        this.containingScrollView.getLocationInWindow(this.scrollLocation);
+        this.containingScrollView.getChildAt(0).getLocationInWindow(this.containerLocation);
+        int top = (this.shapedView.getTop() - this.scrollLocation[1]) + this.containerLocation[1];
+        int height = this.shapedView.getHeight();
+        int height2 = this.containingScrollView.getHeight();
+        if (top < 0) {
+            this.materialShapeDrawable.setInterpolation(Math.max(0.0f, Math.min(1.0f, (top / height) + 1.0f)));
+            this.shapedView.invalidate();
+            return;
+        }
+        if (top + height > height2) {
+            this.materialShapeDrawable.setInterpolation(Math.max(0.0f, Math.min(1.0f, 1.0f - ((r0 - height2) / height))));
+            this.shapedView.invalidate();
+        } else if (this.materialShapeDrawable.getInterpolation() != 1.0f) {
+            this.materialShapeDrawable.setInterpolation(1.0f);
+            this.shapedView.invalidate();
+        }
+    }
+}