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/AlphabeticalAppsList.java

@@ -235,11 +235,10 @@ public class AlphabeticalAppsList {
     private int mNumAppsPerRow;
     private int mNumPredictedAppsPerRow;
 
-    public AlphabeticalAppsList(Context context, int numAppsPerRow, int numPredictedAppsPerRow) {
+    public AlphabeticalAppsList(Context context) {
         mLauncher = (Launcher) context;
         mIndexer = new AlphabeticIndexCompat(context);
         mAppNameComparator = new AppNameComparator(context);
-        setNumAppsPerRow(numAppsPerRow, numPredictedAppsPerRow);
     }
 
     /**
@@ -249,10 +248,6 @@ public class AlphabeticalAppsList {
         mAdapterChangedCallback = cb;
     }
 
-    public SimpleAppSearchManagerImpl newSimpleAppSearchManager() {
-        return new SimpleAppSearchManagerImpl(mApps);
-    }
-
     /**
      * Sets the number of apps per row.  Used only for AppsContainerView.SECTIONED_GRID_COALESCED.
      */
@@ -269,7 +264,7 @@ public class AlphabeticalAppsList {
         mNumAppsPerRow = numAppsPerRow;
         mNumPredictedAppsPerRow = numPredictedAppsPerRow;
 
-        onAppsUpdated();
+        updateAdapterItems();
     }
 
     /**
@@ -279,6 +274,13 @@ public class AlphabeticalAppsList {
         mAdapter = adapter;
     }
 
+    /**
+     * Returns all the apps.
+     */
+    public List<AppInfo> getApps() {
+        return mApps;
+    }
+
     /**
      * Returns sections of all the current filtered applications.
      */
@@ -597,6 +599,11 @@ public class AlphabeticalAppsList {
      * Merges multiple sections to reduce visual raggedness.
      */
     private void mergeSections() {
+        // Ignore merging until we have a valid row size
+        if (mNumAppsPerRow == 0) {
+            return;
+        }
+
         // Go through each section and try and merge some of the sections
         if (AllAppsContainerView.GRID_MERGE_SECTIONS && !hasFilter()) {
             int sectionAppCount = 0;