Add Z scaling during unfold to launcher

The unfold progresses are mapped to 0.85 - 1 range and set as a scale for launcher.

In case of multiple scale animations for workspace and hotseat, they are combined using MultiScaleProperty (e.g. opening an app while unfolding/going to all apps while unfolding). Note that this is a pretty difficult scenario to be in. If that happens, we multiply all values and bound the result between the max and min values.

Bug: 217368525
Test: atest MultiScalePropertyTest and manually
Change-Id: I6131c39f36deade0b7280c72edda2d72045344e9

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

@@ -0,0 +1,109 @@
+/*
+ * 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 com.android.launcher3.Utilities;
+
+/**
+ * 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 sets the multiplication of all values, bounded to the max and the min values.
+ *
+ * @param <T> Type where to apply the property.
+ */
+public abstract class MultiScalePropertyFactory<T> {
+
+    private final String mName;
+    private final ArrayMap<Integer, MultiScaleProperty> mProperties =
+            new ArrayMap<Integer, MultiScaleProperty>();
+
+    // This is an optimization for cases when set is called repeatedly with the same setterIndex.
+    private float mMinOfOthers = 0;
+    private float mMaxOfOthers = 0;
+    private float mMultiplicationOfOthers = 0;
+    private Integer mLastIndexSet = -1;
+    private float mLastAggregatedValue = 1.0f;
+
+    public MultiScalePropertyFactory(String name) {
+        mName = name;
+    }
+
+    /** Returns the [MultiFloatProperty] associated with [inx], creating it if not present. */
+    public MultiScaleProperty get(Integer index) {
+        return mProperties.computeIfAbsent(index,
+                (k) -> new MultiScaleProperty(index, mName + "_" + index));
+    }
+
+
+    /**
+     * Each [setValue] will be aggregated with the other properties values created by the
+     * corresponding factory.
+     */
+    class MultiScaleProperty extends FloatProperty<T> {
+        private final int mInx;
+        private float mValue = 1.0f;
+
+        MultiScaleProperty(int inx, String name) {
+            super(name);
+            mInx = inx;
+        }
+
+        @Override
+        public void setValue(T obj, float newValue) {
+            if (mLastIndexSet != mInx) {
+                mMinOfOthers = Float.MAX_VALUE;
+                mMaxOfOthers = Float.MIN_VALUE;
+                mMultiplicationOfOthers = 1.0f;
+                mProperties.forEach((key, property) -> {
+                    if (key != mInx) {
+                        mMinOfOthers = Math.min(mMinOfOthers, property.mValue);
+                        mMaxOfOthers = Math.max(mMaxOfOthers, property.mValue);
+                        mMultiplicationOfOthers *= property.mValue;
+                    }
+                });
+                mLastIndexSet = mInx;
+            }
+            float minValue = Math.min(mMinOfOthers, newValue);
+            float maxValue = Math.max(mMaxOfOthers, newValue);
+            float multValue = mMultiplicationOfOthers * newValue;
+            mLastAggregatedValue = Utilities.boundToRange(multValue, minValue, maxValue);
+            mValue = newValue;
+            apply(obj, mLastAggregatedValue);
+        }
+
+        @Override
+        public Float get(T t) {
+            return mLastAggregatedValue;
+        }
+
+        @Override
+        public String toString() {
+            return String.valueOf(mValue);
+        }
+    }
+
+    /** Applies value to object after setValue method is called. */
+    protected abstract void apply(T obj, float value);
+}