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/search/AllAppsSearchBarController.java

@@ -0,0 +1,220 @@
+/*
+ * 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.launcher3.allapps.search;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.text.Editable;
+import android.text.TextUtils;
+import android.text.TextWatcher;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+import com.android.launcher3.ExtendedEditText;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.Utilities;
+import com.android.launcher3.allapps.AlphabeticalAppsList;
+import com.android.launcher3.discovery.AppDiscoveryItem;
+import com.android.launcher3.discovery.AppDiscoveryUpdateState;
+import com.android.launcher3.util.ComponentKey;
+import com.android.launcher3.util.PackageManagerHelper;
+
+import java.util.ArrayList;
+
+/**
+ * An interface to a search box that AllApps can command.
+ */
+public class AllAppsSearchBarController
+        implements TextWatcher, OnEditorActionListener, ExtendedEditText.OnBackKeyListener {
+
+    protected Launcher mLauncher;
+    protected AlphabeticalAppsList mApps;
+    protected Callbacks mCb;
+    protected ExtendedEditText mInput;
+    protected String mQuery;
+
+    protected DefaultAppSearchAlgorithm mSearchAlgorithm;
+    protected InputMethodManager mInputMethodManager;
+
+    public void setVisibility(int visibility) {
+        mInput.setVisibility(visibility);
+    }
+    /**
+     * Sets the references to the apps model and the search result callback.
+     */
+    public final void initialize(
+            AlphabeticalAppsList apps, ExtendedEditText input,
+            Launcher launcher, Callbacks cb) {
+        mApps = apps;
+        mCb = cb;
+        mLauncher = launcher;
+
+        mInput = input;
+        mInput.addTextChangedListener(this);
+        mInput.setOnEditorActionListener(this);
+        mInput.setOnBackKeyListener(this);
+
+        mInputMethodManager = (InputMethodManager)
+                mInput.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
+
+        mSearchAlgorithm = onInitializeSearch();
+
+        onInitialized();
+    }
+
+    /**
+     * You can override this method to perform custom initialization.
+     */
+    protected void onInitialized() {
+    }
+
+    /**
+     * This method will get called when the controller is set.
+     */
+    public DefaultAppSearchAlgorithm onInitializeSearch() {
+        return new DefaultAppSearchAlgorithm(mApps.getApps());
+    }
+
+    @Override
+    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+        // Do nothing
+    }
+
+    @Override
+    public void onTextChanged(CharSequence s, int start, int before, int count) {
+        // Do nothing
+    }
+
+    @Override
+    public void afterTextChanged(final Editable s) {
+        mQuery = s.toString();
+        if (mQuery.isEmpty()) {
+            mSearchAlgorithm.cancel(true);
+            mCb.clearSearchResult();
+        } else {
+            mSearchAlgorithm.cancel(false);
+            mSearchAlgorithm.doSearch(mQuery, mCb);
+        }
+    }
+
+    public void refreshSearchResult() {
+        if (TextUtils.isEmpty(mQuery)) {
+            return;
+        }
+        // If play store continues auto updating an app, we want to show partial result.
+        mSearchAlgorithm.cancel(false);
+        mSearchAlgorithm.doSearch(mQuery, mCb);
+    }
+
+    @Override
+    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
+        // Skip if it's not the right action
+        if (actionId != EditorInfo.IME_ACTION_SEARCH) {
+            return false;
+        }
+
+        // Skip if the query is empty
+        String query = v.getText().toString();
+        if (query.isEmpty()) {
+            return false;
+        }
+        return mLauncher.startActivitySafely(v,
+                PackageManagerHelper.getMarketSearchIntent(mLauncher, query), null);
+    }
+
+    @Override
+    public boolean onBackKey() {
+        // Only hide the search field if there is no query
+        String query = Utilities.trim(mInput.getEditableText().toString());
+        if (query.isEmpty()) {
+            reset();
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Resets the search bar state.
+     */
+    public void reset() {
+        unfocusSearchField();
+        mCb.clearSearchResult();
+        mInput.setText("");
+        mQuery = null;
+        hideKeyboard();
+    }
+
+    protected void hideKeyboard() {
+        mInputMethodManager.hideSoftInputFromWindow(mInput.getWindowToken(), 0);
+    }
+
+    protected void unfocusSearchField() {
+        View nextFocus = mInput.focusSearch(View.FOCUS_DOWN);
+        if (nextFocus != null) {
+            nextFocus.requestFocus();
+        }
+    }
+
+    /**
+     * Focuses the search field to handle key events.
+     */
+    public void focusSearchField() {
+        mInput.showKeyboard();
+    }
+
+    /**
+     * Returns whether the search field is focused.
+     */
+    public boolean isSearchFieldFocused() {
+        return mInput.isFocused();
+    }
+
+    /**
+     * Callback for getting search results.
+     */
+    public interface Callbacks {
+
+        /**
+         * Called when the search is complete.
+         *
+         * @param apps sorted list of matching components or null if in case of failure.
+         */
+        void onSearchResult(String query, ArrayList<ComponentKey> apps);
+
+        /**
+         * Called when the search results should be cleared.
+         */
+        void clearSearchResult();
+
+        /**
+         * Called when the app discovery is providing an update of search, which can either be
+         * START for starting a new discovery,
+         * UPDATE for providing a new search result, can be called multiple times,
+         * END for indicating the end of results.
+         *
+         * @param app result item if UPDATE, else null
+         * @param app the update state, START, UPDATE or END
+         */
+        void onAppDiscoverySearchUpdate(@Nullable AppDiscoveryItem app,
+                @NonNull AppDiscoveryUpdateState state);
+    }
+
+}