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