1 files changed, 45 insertions, 0 deletions
diff --git a/src/com/android/messaging/ui/animation/RectEvaluatorCompat.java b/src/com/android/messaging/ui/animation/RectEvaluatorCompat.java
new file mode 100644
index 0000000..e3c60fc
--- /dev/null
+++ b/src/com/android/messaging/ui/animation/RectEvaluatorCompat.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2015 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.messaging.ui.animation;
+
+import android.animation.RectEvaluator;
+import android.animation.TypeEvaluator;
+import android.graphics.Rect;
+
+import com.android.messaging.util.OsUtil;
+
+/**
+ * This evaluator can be used to perform type interpolation between <code>Rect</code> values.
+ * It's backward compatible to Api Level 11.
+ */
+public class RectEvaluatorCompat implements TypeEvaluator<Rect> {
+    public static TypeEvaluator<Rect> create() {
+        if (OsUtil.isAtLeastJB_MR2()) {
+            return new RectEvaluator();
+        } else {
+            return new RectEvaluatorCompat();
+        }
+    }
+
+    @Override
+    public Rect evaluate(float fraction, Rect startValue, Rect endValue) {
+        int left = startValue.left + (int) ((endValue.left - startValue.left) * fraction);
+        int top = startValue.top + (int) ((endValue.top - startValue.top) * fraction);
+        int right = startValue.right + (int) ((endValue.right - startValue.right) * fraction);
+        int bottom = startValue.bottom + (int) ((endValue.bottom - startValue.bottom) * fraction);
+        return new Rect(left, top, right, bottom);
+    }
+}