[gnome-documents] Update zoom actions to reflect zoom limits

[William Jon McCann <mccann src gnome org>]

commit ce4986e699e805582ec436bcad40d6ca44f136ae
Author: William Jon McCann <jmccann redhat com>
Date:   Wed Dec 19 15:53:48 2012 -0500

    Update zoom actions to reflect zoom limits
    
    https://bugzilla.gnome.org/show_bug.cgi?id=690511

 src/preview.js |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/src/preview.js b/src/preview.js
index 5e2573f..2dba493 100644
--- a/src/preview.js
+++ b/src/preview.js
@@ -119,11 +119,23 @@ const PreviewView = new Lang.Class({
             }));
     },
 
+    _onCanZoomInChanged: function() {
+        this._zoomIn.enabled = this.view.can_zoom_in;
+    },
+
+    _onCanZoomOutChanged: function() {
+        this._zoomOut.enabled = this.view.can_zoom_out;
+    },
+
     _createView: function() {
         this.view = EvView.View.new();
         this.widget.add(this.view);
         this.view.show();
 
+        this.view.connect('notify::can-zoom-in',
+                          Lang.bind(this, this._onCanZoomInChanged));
+        this.view.connect('notify::can-zoom-out',
+                          Lang.bind(this, this._onCanZoomOutChanged));
         this.view.connect('button-release-event',
                             Lang.bind(this, this._onButtonReleaseEvent));
         this.view.connect('key-press-event',