1 files changed, 53 insertions, 0 deletions
diff --git a/samples/browseable/WearNotifications/Wearable/src/com.example.android.wearable.wear.wearnotifications/ScalingOffsettingHelper.java b/samples/browseable/WearNotifications/Wearable/src/com.example.android.wearable.wear.wearnotifications/ScalingOffsettingHelper.java
new file mode 100644
index 000000000..84ec2fd33
--- /dev/null
+++ b/samples/browseable/WearNotifications/Wearable/src/com.example.android.wearable.wear.wearnotifications/ScalingOffsettingHelper.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.example.android.wearable.wear.wearnotifications;
+
+import android.support.wearable.view.DefaultOffsettingHelper;
+import android.support.wearable.view.WearableRecyclerView;
+import android.view.View;
+
+/**
+ * Customizes all items (children) in a {@link WearableRecyclerView} to align to left side of
+ * surface/watch and shrinks each item (child) as you scroll away from it.
+ */
+public class ScalingOffsettingHelper extends DefaultOffsettingHelper {
+
+    // Max we scale the child View
+    private static final float MAX_CHILD_SCALE = 0.65f;
+
+    private float mProgressToCenter;
+
+    public ScalingOffsettingHelper() {}
+
+    // Shrinks icons/text and you scroll away
+    @Override
+    public void updateChild(View child, WearableRecyclerView parent) {
+        super.updateChild(child, parent);
+
+        // Figure out % progress from top to bottom
+        float centerOffset = ((float) child.getHeight() / 2.0f) /  (float) parent.getHeight();
+        float yRelativeToCenterOffset = (child.getY() / parent.getHeight()) + centerOffset;
+
+        // Normalize for center
+        mProgressToCenter = Math.abs(0.5f - yRelativeToCenterOffset);
+
+        // Adjust to the maximum scale
+        mProgressToCenter = Math.min(mProgressToCenter, MAX_CHILD_SCALE);
+
+        child.setScaleX(1 - mProgressToCenter);
+        child.setScaleY(1 - mProgressToCenter);
+    }
+}
+\ No newline at end of file