Change wallpaper depth in widget picker

- Also changed widget picker open/close duration, refactored the values into DeviceProfile
- Generalized MultiAdditivePropertyFactory to accept aggregator as parameter

Bug: 240580498
Test: manual
Change-Id: I6886ca514593e404b8d7b0e8ed44f20ec2b77c73

src/com/android/launcher3/util/MultiPropertyFactory.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2022 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.android.launcher3.util;
+
+import android.util.ArrayMap;
+import android.util.FloatProperty;
+import android.util.Log;
+import android.util.Property;
+
+/**
+ * Allows to combine multiple values set by several sources.
+ *
+ * The various sources are meant to use [set], providing different `setterIndex` params. When it is
+ * not set, 0 is used. This is meant to cover the case multiple animations are going on at the same
+ * time.
+ *
+ * This class behaves similarly to [MultiValueAlpha], but is meant to be more abstract and reusable.
+ * It aggregate all values using the provided [aggregator].
+ *
+ * @param <T> Type where to apply the property.
+ */
+public class MultiPropertyFactory<T> {
+
+    private static final boolean DEBUG = false;
+    private static final String TAG = "MultiPropertyFactory";
+    private final String mName;
+    private final ArrayMap<Integer, MultiProperty> mProperties = new ArrayMap<>();
+
+    // This is an optimization for cases when set is called repeatedly with the same setterIndex.
+    private float mAggregationOfOthers = 0f;
+    private Integer mLastIndexSet = -1;
+    private final Property<T, Float> mProperty;
+    private final FloatBiFunction mAggregator;
+
+    /**
+     * Represents a function that accepts two float and produces a float.
+     */
+    public interface FloatBiFunction {
+        /**
+         * Applies this function to the given arguments.
+         */
+        float apply(float a, float b);
+    }
+
+    public MultiPropertyFactory(String name, Property<T, Float> property,
+            FloatBiFunction aggregator) {
+        mName = name;
+        mProperty = property;
+        mAggregator = aggregator;
+    }
+
+    /** Returns the [MultiFloatProperty] associated with [inx], creating it if not present. */
+    public MultiProperty get(Integer index) {
+        return mProperties.computeIfAbsent(index,
+                (k) -> new MultiProperty(index, mName + "_" + index));
+    }
+
+    /**
+     * Each [setValue] will be aggregated with the other properties values created by the
+     * corresponding factory.
+     */
+    class MultiProperty extends FloatProperty<T> {
+        private final int mInx;
+        private float mValue = 0f;
+
+        MultiProperty(int inx, String name) {
+            super(name);
+            mInx = inx;
+        }
+
+        @Override
+        public void setValue(T obj, float newValue) {
+            if (mLastIndexSet != mInx) {
+                mAggregationOfOthers = 0f;
+                mProperties.forEach((key, property) -> {
+                    if (key != mInx) {
+                        mAggregationOfOthers =
+                                mAggregator.apply(mAggregationOfOthers, property.mValue);
+                    }
+                });
+                mLastIndexSet = mInx;
+            }
+            float lastAggregatedValue = mAggregator.apply(mAggregationOfOthers, newValue);
+            mValue = newValue;
+            apply(obj, lastAggregatedValue);
+
+            if (DEBUG) {
+                Log.d(TAG, "name=" + mName
+                        + " newValue=" + newValue + " mInx=" + mInx
+                        + " aggregated=" + lastAggregatedValue + " others= " + mProperties);
+            }
+        }
+
+        @Override
+        public Float get(T object) {
+            // The scale of the view should match mLastAggregatedValue. Still, if it has been
+            // changed without using this property, it can differ. As this get method is usually
+            // used to set the starting point on an animation, this would result in some jumps
+            // when the view scale is different than the last aggregated value. To stay on the
+            // safe side, let's return the real view scale.
+            return mProperty.get(object);
+        }
+
+        @Override
+        public String toString() {
+            return String.valueOf(mValue);
+        }
+    }
+
+    protected void apply(T object, float value) {
+        mProperty.set(object, value);
+    }
+}