Moving apps search related logic into a custom layout file

This will allow derivative projects to easily change the search behavior
by simply overriding the xml file

Bug: 37616877
Change-Id: Ib8d6a2dab06819a52611e9a3d97c70c5a49bbf97

src/com/android/launcher3/allapps/SearchUiManager.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2017 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.allapps;
+
+import android.view.KeyEvent;
+
+/**
+ * Interface for controlling the Apps search UI.
+ */
+public interface SearchUiManager {
+
+    /**
+     * Initializes the search manager.
+     */
+    void initialize(AlphabeticalAppsList appsList, AllAppsRecyclerView recyclerView);
+
+    /**
+     * Notifies the search manager that the apps-list has changed and the search UI should be
+     * updated accordingly.
+     */
+    void refreshSearchResult();
+
+    /**
+     * Notifies the search manager to close any active search session.
+     */
+    void reset();
+
+    /**
+     * Called before dispatching a key event, in case the search manager wants to initialize
+     * some UI beforehand.
+     */
+    void preDispatchKeyEvent(KeyEvent keyEvent);
+
+    /**
+     * Returns true if the IME should be brought back.
+     * TODO: Remove when removing support for opening all-apps in search mode.
+     */
+    boolean shouldRestoreImeState();
+
+    /**
+     * Starts the search UI
+     * TODO: Remove when removing support for opening all-apps in search mode.
+     */
+    void startAppsSearch();
+}