ADD week 5

02-Easy5/E5/sources/androidx/viewpager2/widget/CompositeOnPageChangeCallback.java

@@ -0,0 +1,64 @@
+package androidx.viewpager2.widget;
+
+import androidx.viewpager2.widget.ViewPager2;
+import java.util.ArrayList;
+import java.util.ConcurrentModificationException;
+import java.util.Iterator;
+import java.util.List;
+
+/* loaded from: classes.dex */
+final class CompositeOnPageChangeCallback extends ViewPager2.OnPageChangeCallback {
+    private final List<ViewPager2.OnPageChangeCallback> mCallbacks;
+
+    CompositeOnPageChangeCallback(int i) {
+        this.mCallbacks = new ArrayList(i);
+    }
+
+    void addOnPageChangeCallback(ViewPager2.OnPageChangeCallback onPageChangeCallback) {
+        this.mCallbacks.add(onPageChangeCallback);
+    }
+
+    void removeOnPageChangeCallback(ViewPager2.OnPageChangeCallback onPageChangeCallback) {
+        this.mCallbacks.remove(onPageChangeCallback);
+    }
+
+    @Override // androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback
+    public void onPageScrolled(int i, float f, int i2) {
+        try {
+            Iterator<ViewPager2.OnPageChangeCallback> it = this.mCallbacks.iterator();
+            while (it.hasNext()) {
+                it.next().onPageScrolled(i, f, i2);
+            }
+        } catch (ConcurrentModificationException e) {
+            throwCallbackListModifiedWhileInUse(e);
+        }
+    }
+
+    @Override // androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback
+    public void onPageSelected(int i) {
+        try {
+            Iterator<ViewPager2.OnPageChangeCallback> it = this.mCallbacks.iterator();
+            while (it.hasNext()) {
+                it.next().onPageSelected(i);
+            }
+        } catch (ConcurrentModificationException e) {
+            throwCallbackListModifiedWhileInUse(e);
+        }
+    }
+
+    @Override // androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback
+    public void onPageScrollStateChanged(int i) {
+        try {
+            Iterator<ViewPager2.OnPageChangeCallback> it = this.mCallbacks.iterator();
+            while (it.hasNext()) {
+                it.next().onPageScrollStateChanged(i);
+            }
+        } catch (ConcurrentModificationException e) {
+            throwCallbackListModifiedWhileInUse(e);
+        }
+    }
+
+    private void throwCallbackListModifiedWhileInUse(ConcurrentModificationException concurrentModificationException) {
+        throw new IllegalStateException("Adding and removing callbacks during dispatch to callbacks is not supported", concurrentModificationException);
+    }
+}