[eog] EogWindow: Disable zoom button if no image is loaded

[Felix Riemann <friemann src gnome org>]

commit 366b3b1a62a1022116430b6ac17ecf2e3c77048e
Author: Felix Riemann <friemann gnome org>
Date:   Wed Jan 28 20:49:03 2015 +0100

    EogWindow: Disable zoom button if no image is loaded

 src/eog-window.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/src/eog-window.c b/src/eog-window.c
index 7e1ed47..13eddbc 100644
--- a/src/eog-window.c
+++ b/src/eog-window.c
@@ -4315,6 +4315,11 @@ eog_window_construct_ui (EogWindow *window)
                          G_CALLBACK (eog_window_zoom_button_toggled_cb),
                          window);
        gtk_header_bar_pack_start (GTK_HEADER_BAR (headerbar), zoom_button);
+       /* disable zoom button if no image is loaded */
+       g_object_bind_property (g_action_map_lookup_action (G_ACTION_MAP(window),
+                                                           "zoom-normal"),
+                               "enabled", zoom_button, "sensitive",
+                               G_BINDING_DEFAULT);
        gtk_widget_show (zoom_button);
 
        priv->zoom_revealer = gtk_revealer_new ();