searchDisplay: Add a base class for common parts of search results

Right now, this doesn't give us very much, since IconGrid and StBoxLayout
have different APIs. But since we want to introduce result caching, it
makes to reduce the duplication we already have so we don't need to add
the code to do so in both places.

https://bugzilla.gnome.org/show_bug.cgi?id=693836

js/ui/searchDisplay.js

@@ -180,12 +180,38 @@ const GridSearchResult = new Lang.Class({
     }
 });
 
-const ListSearchResults = new Lang.Class({
+const SearchResultsBase = new Lang.Class({
-    Name: 'ListSearchResults',
+    Name: 'SearchResultsBase',
 
     _init: function(provider) {
         this.provider = provider;
 
+        this._notDisplayedResult = [];
+        this._terms = [];
+    },
+
+    hasMoreResults: function() {
+        return this._notDisplayedResult.length > 0;
+    },
+
+    _keyFocusIn: function(icon) {
+        this.emit('key-focus-in', icon);
+    },
+
+    setResults: function(results, terms) {
+        // copy the lists
+        this._notDisplayedResult = results.slice(0);
+        this._terms = terms.slice(0);
+    }
+});
+
+const ListSearchResults = new Lang.Class({
+    Name: 'ListSearchResults',
+    Extends: SearchResultsBase,
+
+    _init: function(provider) {
+        this.parent(provider);
+
         this.actor = new St.BoxLayout({ style_class: 'search-section-content' });
         this.providerIcon = new ProviderIcon(provider);
         this.providerIcon.connect('clicked', Lang.bind(this,
@@ -202,9 +228,6 @@ const ListSearchResults = new Lang.Class({
         this._content = new St.BoxLayout({ style_class: 'list-search-results',
                                            vertical: true });
         this.actor.add(this._content, { expand: true });
-
-        this._notDisplayedResult = [];
-        this._terms = [];
     },
 
     getResultsForDisplay: function() {
@@ -217,20 +240,6 @@ const ListSearchResults = new Lang.Class({
         return this._content.get_n_children();
     },
 
-    hasMoreResults: function() {
-        return this._notDisplayedResult.length > 0;
-    },
-
-    setResults: function(results, terms) {
-        // copy the lists
-        this._notDisplayedResult = results.slice(0);
-        this._terms = terms.slice(0);
-    },
-
-    _keyFocusIn: function(icon) {
-        this.emit('key-focus-in', icon);
-    },
-
     renderResults: function(metas) {
         for (let i = 0; i < metas.length; i++) {
             let display = new ListSearchResult(this.provider, metas[i], this._terms);
@@ -254,18 +263,16 @@ Signals.addSignalMethods(ListSearchResults.prototype);
 
 const GridSearchResults = new Lang.Class({
     Name: 'GridSearchResults',
+    Extends: SearchResultsBase,
 
     _init: function(provider) {
-        this.provider = provider;
+        this.parent(provider);
 
         this._grid = new IconGrid.IconGrid({ rowLimit: MAX_GRID_SEARCH_RESULTS_ROWS,
                                              xAlign: St.Align.START });
         this.actor = new St.Bin({ x_align: St.Align.MIDDLE });
 
         this.actor.set_child(this._grid.actor);
-
-        this._notDisplayedResult = [];
-        this._terms = [];
     },
 
     getResultsForDisplay: function() {
@@ -278,20 +285,6 @@ const GridSearchResults = new Lang.Class({
         return this._grid.visibleItemsCount();
     },
 
-    hasMoreResults: function() {
-        return this._notDisplayedResult.length > 0;
-    },
-
-    setResults: function(results, terms) {
-        // copy the lists
-        this._notDisplayedResult = results.slice(0);
-        this._terms = terms.slice(0);
-    },
-
-    _keyFocusIn: function(icon) {
-        this.emit('key-focus-in', icon);
-    },
-
     renderResults: function(metas) {
         for (let i = 0; i < metas.length; i++) {
             let display = new GridSearchResult(this.provider, metas[i], this._terms);