1 files changed, 93 insertions, 0 deletions
diff --git a/src/com/android/launcher3/anim/PropertySetter.java b/src/com/android/launcher3/anim/PropertySetter.java
new file mode 100644
index 000000000..51580b1ea
--- /dev/null
+++ b/src/com/android/launcher3/anim/PropertySetter.java
@@ -0,0 +1,93 @@
+/*
+ * 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.android.launcher3.anim;
+
+import static com.android.launcher3.compat.AccessibilityManagerCompat.isAccessibilityEnabled;
+
+import android.animation.Animator;
+import android.animation.ObjectAnimator;
+import android.animation.TimeInterpolator;
+import android.util.Property;
+import android.view.View;
+
+/**
+ * Utility class for setting a property with or without animation
+ */
+public class PropertySetter {
+
+    public static final PropertySetter NO_ANIM_PROPERTY_SETTER = new PropertySetter();
+
+    public void setViewAlpha(View view, float alpha, TimeInterpolator interpolator) {
+        view.setAlpha(alpha);
+        AlphaUpdateListener.updateVisibility(view, isAccessibilityEnabled(view.getContext()));
+    }
+
+    public <T> void setFloat(T target, Property<T, Float> property, float value,
+            TimeInterpolator interpolator) {
+        property.set(target, value);
+    }
+
+    public <T> void setInt(T target, Property<T, Integer> property, int value,
+            TimeInterpolator interpolator) {
+        property.set(target, value);
+    }
+
+    public static class AnimatedPropertySetter extends PropertySetter {
+
+        private final long mDuration;
+        private final AnimatorSetBuilder mStateAnimator;
+
+        public AnimatedPropertySetter(long duration, AnimatorSetBuilder builder) {
+            mDuration = duration;
+            mStateAnimator = builder;
+        }
+
+        @Override
+        public void setViewAlpha(View view, float alpha, TimeInterpolator interpolator) {
+            if (view.getAlpha() == alpha) {
+                return;
+            }
+            ObjectAnimator anim = ObjectAnimator.ofFloat(view, View.ALPHA, alpha);
+            anim.addListener(new AlphaUpdateListener(
+                    view, isAccessibilityEnabled(view.getContext())));
+            anim.setDuration(mDuration).setInterpolator(interpolator);
+            mStateAnimator.play(anim);
+        }
+
+        @Override
+        public <T> void setFloat(T target, Property<T, Float> property, float value,
+                TimeInterpolator interpolator) {
+            if (property.get(target) == value) {
+                return;
+            }
+            Animator anim = ObjectAnimator.ofFloat(target, property, value);
+            anim.setDuration(mDuration).setInterpolator(interpolator);
+            mStateAnimator.play(anim);
+        }
+
+        @Override
+        public <T> void setInt(T target, Property<T, Integer> property, int value,
+                TimeInterpolator interpolator) {
+            if (property.get(target) == value) {
+                return;
+            }
+            Animator anim = ObjectAnimator.ofInt(target, property, value);
+            anim.setDuration(mDuration).setInterpolator(interpolator);
+            mStateAnimator.play(anim);
+        }
+    }
+}