[gnome-documents/wip/split-view: 2/14] Don't clear DocumentManager on every TrackerController refresh

[Debarshi Ray <debarshir src gnome org>]

commit 633a2c3e64ace86c9a88368c6c5cdfdc8f3232eb
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Sep 25 14:40:36 2014 +0200

    Don't clear DocumentManager on every TrackerController refresh
    
    We were clearing DocumentManager on every refresh of the
    TrackerController. This will be problematic when we implement the new
    split view designs because DocumentManager will have items spanning
    across multiple views. Refreshing the TrackerController for one view
    should not clear DocumentManager because it might have items for some
    other view.
    
    Instead, we can add some filtering to ViewModel so that it only picks
    those items that are relevant to the view for which it is a model.
    
    Since we are not clearing DocumentManager on every refresh, we will
    find some items that are already part of the manager. Avoid emitting
    an extra "object-removed" / "object-added" pair in these cases.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=686461

 src/documents.js         |   14 ++++++++++----
 src/trackerController.js |    2 --
 src/view.js              |   11 ++++++++---
 3 files changed, 18 insertions(+), 9 deletions(-)
---
diff --git a/src/documents.js b/src/documents.js
index eca77e7..08e74af 100644
--- a/src/documents.js
+++ b/src/documents.js
@@ -1155,11 +1155,17 @@ const DocumentManager = new Lang.Class({
     },
 
     addDocumentFromCursor: function(cursor) {
-        let doc = this.createDocumentFromCursor(cursor);
-        this.addItem(doc);
+        let id = cursor.get_string(Query.QueryColumns.URN)[0];
+        let doc = this.getItemById(id);
 
-        if (doc.collection)
-            Application.collectionManager.addItem(doc);
+        if (doc) {
+            this.emit('item-added', doc);
+        } else {
+            doc = this.createDocumentFromCursor(cursor);
+            this.addItem(doc);
+            if (doc.collection)
+                Application.collectionManager.addItem(doc);
+        }
 
         return doc;
     },
diff --git a/src/trackerController.js b/src/trackerController.js
index 2bf227b..e2107b9 100644
--- a/src/trackerController.js
+++ b/src/trackerController.js
@@ -242,8 +242,6 @@ const TrackerController = new Lang.Class({
         }
 
         this._setQueryStatus(true);
-        Application.documentManager.clear();
-
         this._performCurrentQuery();
     },
 
diff --git a/src/view.js b/src/view.js
index ad671f3..c84424b 100644
--- a/src/view.js
+++ b/src/view.js
@@ -125,8 +125,13 @@ const ViewModel = new Lang.Class({
             Lang.bind(this, this._onItemAdded));
         Application.documentManager.connect('item-removed',
             Lang.bind(this, this._onItemRemoved));
-        Application.documentManager.connect('clear',
-            Lang.bind(this, this._onClear));
+
+        Application.trackerController.connect('query-status-changed', Lang.bind(this,
+            function(o, status) {
+                if (!status)
+                    return;
+                this._clear();
+            }));
 
         // populate with the intial items
         let items = Application.documentManager.getItems();
@@ -135,7 +140,7 @@ const ViewModel = new Lang.Class({
         }
     },
 
-    _onClear: function() {
+    _clear: function() {
         this.model.clear();
     },