[gnome-boxes] Do not enable 'continue' button until url is not empty

[Marc-Andre Lureau <malureau src gnome org>]

commit eae1fac72234ac6b63f782cbdbcc78eb58caab7b
Author: Marc-Andrà Lureau <marcandre lureau gmail com>
Date:   Thu Nov 3 00:56:57 2011 +0100

    Do not enable 'continue' button until url is not empty

 src/wizard-source.vala |    4 +++-
 src/wizard.vala        |   20 ++++++++++++++++++--
 2 files changed, 21 insertions(+), 3 deletions(-)
---
diff --git a/src/wizard-source.vala b/src/wizard-source.vala
index d6adf59..18e5aae 100644
--- a/src/wizard-source.vala
+++ b/src/wizard-source.vala
@@ -18,6 +18,8 @@ private class Boxes.WizardSource: GLib.Object {
         set {
             _page = value;
             notebook.set_current_page (page);
+            if (page == SourcePage.URL)
+                url_entry.changed ();
         }
     }
     public string uri {
@@ -26,7 +28,7 @@ private class Boxes.WizardSource: GLib.Object {
     }
 
     private Gtk.Notebook notebook;
-    private Gtk.Entry url_entry;
+    public Gtk.Entry url_entry;
 
     public WizardSource () {
         notebook = new Gtk.Notebook ();
diff --git a/src/wizard.vala b/src/wizard.vala
index 24fecf2..6ac7399 100644
--- a/src/wizard.vala
+++ b/src/wizard.vala
@@ -36,6 +36,15 @@ private class Boxes.Wizard: Boxes.UI {
         get { return _page; }
         set {
             switch (value) {
+            case WizardPage.INTRODUCTION:
+                next_button.sensitive = true;
+                break;
+
+            case WizardPage.SOURCE:
+                // reset page to notify deeply widgets states
+                wizard_source.page = wizard_source.page;
+                break;
+
             case WizardPage.PREPARATION:
                 try {
                     prepare ();
@@ -72,8 +81,8 @@ private class Boxes.Wizard: Boxes.UI {
             /* highlight in white current page label */
             steps.get (page).modify_fg (Gtk.StateType.NORMAL, get_color ("white"));
 
-            back_button.set_sensitive (page != WizardPage.INTRODUCTION);
-            next_button.set_label (page != WizardPage.REVIEW ? _("Continue") : _("Create"));
+            back_button.sensitive = page != WizardPage.INTRODUCTION;
+            next_button.label = page != WizardPage.REVIEW ? _("Continue") : _("Create");
         }
     }
 
@@ -81,6 +90,13 @@ private class Boxes.Wizard: Boxes.UI {
         steps = new GenericArray<Gtk.Label> ();
         steps.length = WizardPage.LAST;
         wizard_source = new Boxes.WizardSource ();
+        wizard_source.notify["page"].connect(() => {
+            if (wizard_source.page == Boxes.SourcePage.MAIN)
+                next_button.sensitive = false;
+        });
+        wizard_source.url_entry.changed.connect (() => {
+            next_button.sensitive = wizard_source.uri.len () != 0;
+        });
     }
 
     public Wizard (App app) {