[recipes] chef dialog: Manage save button sensitivity

[Matthias Clasen <matthiasc src gnome org>]

commit 229fa0f8ef574b613f329e05abef2228d326c8f0
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Feb 6 16:12:05 2017 +0100

    chef dialog: Manage save button sensitivity
    
    Only make the save button sensitive (and thus blue) when we
    have reason to believe that some field has changed.

 src/gr-chef-dialog.c  |   16 ++++++++++++++++
 src/gr-chef-dialog.ui |    7 +++++++
 2 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/src/gr-chef-dialog.c b/src/gr-chef-dialog.c
index d6349f9..af437db 100644
--- a/src/gr-chef-dialog.c
+++ b/src/gr-chef-dialog.c
@@ -82,6 +82,12 @@ update_image (GrChefDialog *self)
 }
 
 static void
+field_changed (GrChefDialog *self)
+{
+        gtk_widget_set_sensitive (self->save_button, TRUE);
+}
+
+static void
 file_chooser_response (GtkNativeDialog *self,
                        gint             response_id,
                        GrChefDialog   *prefs)
@@ -90,6 +96,8 @@ file_chooser_response (GtkNativeDialog *self,
                 g_free (prefs->image_path);
                 prefs->image_path = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (self));
                 update_image (prefs);
+
+                field_changed (prefs);
         }
 }
 
@@ -226,6 +234,8 @@ static void
 gr_chef_dialog_set_chef (GrChefDialog *self,
                          GrChef       *chef)
 {
+        g_autoptr(GrChef) old_chef = self->chef;
+
         if (g_set_object (&self->chef, chef)) {
                 const char *fullname;
                 const char *name;
@@ -259,6 +269,11 @@ gr_chef_dialog_set_chef (GrChefDialog *self,
 
                 update_image (self);
         }
+
+        if (old_chef != NULL && old_chef != chef)
+                gtk_widget_set_sensitive (self->save_button, TRUE);
+        else
+                gtk_widget_set_sensitive (self->save_button, FALSE);
 }
 
 static void
@@ -308,6 +323,7 @@ gr_chef_dialog_class_init (GrChefDialogClass *klass)
         gtk_widget_class_bind_template_callback (widget_class, chef_selected);
         gtk_widget_class_bind_template_callback (widget_class, save_chef);
         gtk_widget_class_bind_template_callback (widget_class, close_dialog);
+        gtk_widget_class_bind_template_callback (widget_class, field_changed);
 }
 
 GrChefDialog *
diff --git a/src/gr-chef-dialog.ui b/src/gr-chef-dialog.ui
index 6a1a3cf..d7a3bc1 100644
--- a/src/gr-chef-dialog.ui
+++ b/src/gr-chef-dialog.ui
@@ -19,6 +19,7 @@
         <child>
           <object class="GtkButton" id="save_button">
             <property name="visible">1</property>
+            <property name="sensitive">0</property>
             <property name="label" translatable="yes">_Save</property>
             <property name="use-underline">1</property>
             <signal name="clicked" handler="save_chef" swapped="yes"/>
@@ -135,6 +136,7 @@
                       <object class="GtkEntry" id="fullname">
                         <property name="visible">1</property>
                         <property name="placeholder-text" translatable="yes">Name…</property>
+                        <signal name="notify::text" handler="field_changed" swapped="yes"/>
                       </object>
                       <packing>
                         <property name="left-attach">1</property>
@@ -145,6 +147,7 @@
                       <object class="GtkEntry" id="name">
                         <property name="visible">1</property>
                         <property name="placeholder-text" translatable="yes">Short Name…</property>
+                        <signal name="notify::text" handler="field_changed" swapped="yes"/>
                       </object>
                       <packing>
                         <property name="left-attach">1</property>
@@ -164,6 +167,7 @@
                             <property name="left-margin">10</property>
                             <property name="right-margin">10</property>
                             <property name="bottom-margin">10</property>
+                            <property name="buffer">buffer</property>
                           </object>
                         </child>
                       </object>
@@ -219,4 +223,7 @@
       </object>
     </child>
   </object>
+  <object class="GtkTextBuffer" id="buffer">
+    <signal name="changed" handler="field_changed" swapped="yes"/>
+  </object>
 </interface>