[sushi] evince: make the prev/next buttons insensitive when necessary

[Cosimo Cecchi <cosimoc src gnome org>]

commit 029eeff9cf97281f719bb603873df81bc4bf9969
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Tue May 10 13:40:28 2011 -0400

    evince: make the prev/next buttons insensitive when necessary
    
    I.e. when there's no previous or next pages to jump to.

 src/js/viewers/evince.js |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/js/viewers/evince.js b/src/js/viewers/evince.js
index 896b191..8f4ec8c 100644
--- a/src/js/viewers/evince.js
+++ b/src/js/viewers/evince.js
@@ -57,6 +57,9 @@ EvinceRenderer.prototype = {
 
         curPage = this._model.get_page();
         totPages = this._document.get_n_pages();
+
+        this._toolbarBack.set_sensitive(curPage > 0);
+        this._toolbarForward.set_sensitive(curPage < totPages - 1);
         
         this._pageLabel.set_text(_("%d of %d").format(curPage + 1, totPages));
     },