Add AllAppsRow plugin interface

Bug: 115877296
Change-Id: I750941f220d08ca9ee14067253253f6d81417101

src_plugins/com/android/systemui/plugins/AllAppsRow.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2018 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.systemui.plugins;
+
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.android.systemui.plugins.annotations.ProvidesInterface;
+
+/**
+ * Implement this plugin interface to add a row of views to the top of the all apps drawer.
+ */
+@ProvidesInterface(action = AllAppsRow.ACTION, version = AllAppsRow.VERSION)
+public interface AllAppsRow extends Plugin {
+    String ACTION = "com.android.systemui.action.PLUGIN_ALL_APPS_ACTIONS";
+    int VERSION = 1;
+
+    /**
+     * Setup the row and return the parent view.
+     * @param parent The ViewGroup to which launcher will add this row.
+     */
+    View setup(ViewGroup parent);
+
+    /**
+     * @return The height to reserve in all apps for your views.
+     */
+    int getExpectedHeight();
+
+    /**
+     * Update launcher whenever {@link #getExpectedHeight()} changes.
+     */
+    void setOnHeightUpdatedListener(OnHeightUpdatedListener onHeightUpdatedListener);
+
+    interface OnHeightUpdatedListener {
+        void onHeightUpdated();
+    }
+}