1 files changed, 27 insertions, 0 deletions
diff --git a/mobile/android/base/java/org/mozilla/gecko/animation/HeightChangeAnimation.java b/mobile/android/base/java/org/mozilla/gecko/animation/HeightChangeAnimation.java
new file mode 100644
index 000000000..bf8007bbf
--- /dev/null
+++ b/mobile/android/base/java/org/mozilla/gecko/animation/HeightChangeAnimation.java
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.animation;
+
+import android.view.View;
+import android.view.animation.Animation;
+import android.view.animation.Transformation;
+
+public class HeightChangeAnimation extends Animation {
+    int mFromHeight;
+    int mToHeight;
+    View mView;
+
+    public HeightChangeAnimation(View view, int fromHeight, int toHeight) {
+        mView = view;
+        mFromHeight = fromHeight;
+        mToHeight = toHeight;
+    }
+
+    @Override
+    protected void applyTransformation(float interpolatedTime, Transformation t) {
+        mView.getLayoutParams().height = Math.round((mFromHeight * (1 - interpolatedTime)) + (mToHeight * interpolatedTime));
+        mView.requestLayout();
+    }
+}