Refactoring all apps search to support external search bar.

- Adding support for an external search bar that can be used
  to search a container view.  This adds a new interface
  AllAppsSearchController which manages the external search
  bar.  Each controller will have its own search implementation
  which means that we no longer need a common AppSearchManager
  interface.
- Removing elevation controller as we no longer have a builtin
  search bar in all apps
- Refactoring container view insets so that they behave
  the same in all containers.
- Refactoring apps view to ensure that we only update the number
  of columns with the available width
- Cleaning up LauncherCallbacks interface

Bug: 20127840
Bug: 21494973

Change-Id: I710b8e18196961d77d8a29f0c345531d480936fe

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

@@ -0,0 +1,91 @@
+/*
+ * 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;
+
+import android.content.ComponentName;
+import android.os.Handler;
+import com.android.launcher3.AppInfo;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+/**
+ * The default search implementation.
+ */
+public class DefaultAppSearchAlgorithm {
+
+    private static final Pattern SPLIT_PATTERN = Pattern.compile("[\\s|\\p{javaSpaceChar}]+");
+
+    private final List<AppInfo> mApps;
+    private final Handler mResultHandler;
+
+    public DefaultAppSearchAlgorithm(List<AppInfo> apps) {
+        mApps = apps;
+        mResultHandler = new Handler();
+    }
+
+    public void cancel(boolean interruptActiveRequests) {
+        if (interruptActiveRequests) {
+            mResultHandler.removeCallbacksAndMessages(null);
+        }
+    }
+
+    public void doSearch(final String query,
+            final AllAppsSearchBarController.Callbacks callback) {
+        // Do an intersection of the words in the query and each title, and filter out all the
+        // apps that don't match all of the words in the query.
+        final String queryTextLower = query.toLowerCase();
+        final String[] queryWords = SPLIT_PATTERN.split(queryTextLower);
+        final ArrayList<ComponentName> result = new ArrayList<>();
+        int total = mApps.size();
+
+        for (int i = 0; i < total; i++) {
+            AppInfo info = mApps.get(i);
+            if (!result.contains(info.componentName) && matches(info, queryWords)) {
+                result.add(info.componentName);
+            }
+        }
+        mResultHandler.post(new Runnable() {
+
+            @Override
+            public void run() {
+                callback.onSearchResult(query, result);
+            }
+        });
+    }
+
+    private boolean matches(AppInfo info, String[] queryWords) {
+        String title = info.title.toString();
+        String[] words = SPLIT_PATTERN.split(title.toLowerCase());
+        for (int qi = 0; qi < queryWords.length; qi++) {
+            boolean foundMatch = false;
+            for (int i = 0; i < words.length; i++) {
+                if (words[i].startsWith(queryWords[qi])) {
+                    foundMatch = true;
+                    break;
+                }
+            }
+            if (!foundMatch) {
+                // If there is a word in the query that does not match any words in this
+                // title, so skip it.
+                return false;
+            }
+        }
+        return true;
+    }
+
+}