diff --git a/go/quickstep/res/layout/icon_recents_root_view.xml b/go/quickstep/res/layout/icon_recents_root_view.xml
index 122fadf245..82d58909e5 100644
--- a/go/quickstep/res/layout/icon_recents_root_view.xml
+++ b/go/quickstep/res/layout/icon_recents_root_view.xml
@@ -14,11 +14,17 @@
See the License for the specific language governing permissions and
limitations under the License.
-->
-
-
\ No newline at end of file
+ android:gravity="center">
+
+
+
\ No newline at end of file
diff --git a/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java b/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
new file mode 100644
index 0000000000..e4741e9d50
--- /dev/null
+++ b/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2019 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.quickstep.views;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.FloatProperty;
+import android.view.ViewDebug;
+import android.widget.FrameLayout;
+
+/**
+ * Root view for the icon recents view.
+ */
+public final class IconRecentsView extends FrameLayout {
+
+ public static final FloatProperty TRANSLATION_Y_FACTOR =
+ new FloatProperty("translationYFactor") {
+
+ @Override
+ public void setValue(IconRecentsView view, float v) {
+ view.setTranslationYFactor(v);
+ }
+
+ @Override
+ public Float get(IconRecentsView view) {
+ return view.mTranslationYFactor;
+ }
+ };
+
+ public static final FloatProperty CONTENT_ALPHA =
+ new FloatProperty("contentAlpha") {
+ @Override
+ public void setValue(IconRecentsView view, float v) {
+ ALPHA.set(view, v);
+ }
+
+ @Override
+ public Float get(IconRecentsView view) {
+ return ALPHA.get(view);
+ }
+ };
+
+ /**
+ * A ratio representing the view's relative placement within its padded space. For example, 0
+ * is top aligned and 0.5 is centered vertically.
+ */
+ @ViewDebug.ExportedProperty(category = "launcher")
+ private float mTranslationYFactor;
+
+ public IconRecentsView(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ }
+
+ public void setTranslationYFactor(float translationFactor) {
+ mTranslationYFactor = translationFactor;
+ setTranslationY(computeTranslationYForFactor(mTranslationYFactor));
+ }
+
+ private float computeTranslationYForFactor(float translationYFactor) {
+ return translationYFactor * (getPaddingBottom() - getPaddingTop());
+ }
+}
diff --git a/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java b/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
index 7389d65a65..722c721f9e 100644
--- a/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
@@ -67,6 +67,10 @@ public class LauncherRecentsView extends RecentsView {
}
};
+ /**
+ * A ratio representing the view's relative placement within its padded space. For example, 0
+ * is top aligned and 0.5 is centered vertically.
+ */
@ViewDebug.ExportedProperty(category = "launcher")
private float mTranslationYFactor;