[recipes/temperature-settings: 3/3] Add a temperature button on the details page

[Matthias Clasen <matthiasc src gnome org>]

commit d44afd13b2ad47b82c05ef12cbe6d10a6f2b7fa3
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Mar 12 19:08:45 2017 -0400

    Add a temperature button on the details page
    
    Just an idea, and probably not a good one.

 src/gr-details-page.c  |   35 +++++++++++++++++++++++++++++++++++
 src/gr-details-page.ui |   11 +++++++++++
 2 files changed, 46 insertions(+), 0 deletions(-)
---
diff --git a/src/gr-details-page.c b/src/gr-details-page.c
index fadd4da..72d522a 100644
--- a/src/gr-details-page.c
+++ b/src/gr-details-page.c
@@ -87,6 +87,7 @@ struct _GrDetailsPage
         GtkWidget *export_button;
         GtkWidget *error_label;
         GtkWidget *error_revealer;
+        GtkWidget *temperature_button;
 
         guint save_timeout;
 
@@ -362,10 +363,42 @@ dismiss_error (GrDetailsPage *page)
 }
 
 static void
+update_temperature_label (GrDetailsPage *page)
+{
+        g_autoptr(GSettings) settings = g_settings_new ("org.gnome.Recipes");
+
+        if (g_settings_get_enum (settings, "temperature-unit") == 1)
+                gtk_button_set_label (GTK_BUTTON (page->temperature_button), "🌡℉");
+        else
+                gtk_button_set_label (GTK_BUTTON (page->temperature_button), "🌡℃");
+}
+
+static char * process_instructions (const char *instructions);
+
+static void
+toggle_temperature (GtkButton     *button,
+                    GrDetailsPage *page)
+{
+        g_autoptr(GSettings) settings = g_settings_new ("org.gnome.Recipes");
+        int value;
+        const char *instructions;
+        g_autofree char *processed;
+
+        value = g_settings_get_enum (settings, "temperature-unit");
+        g_settings_set_enum (settings, "temperature-unit", value == 0 ? 1 : 0);
+        update_temperature_label (page);
+
+        instructions = gr_recipe_get_translated_instructions (page->recipe);
+        processed = process_instructions (instructions);
+        gtk_label_set_label (GTK_LABEL (page->instructions_label), processed);
+}
+
+static void
 gr_details_page_init (GrDetailsPage *page)
 {
         gtk_widget_set_has_window (GTK_WIDGET (page), FALSE);
         gtk_widget_init_template (GTK_WIDGET (page));
+        update_temperature_label (page);
         connect_store_signals (page);
 
         g_signal_connect (gtk_text_view_get_buffer (GTK_TEXT_VIEW (page->notes_field)), "changed", 
G_CALLBACK (schedule_save), page);
@@ -424,6 +457,7 @@ gr_details_page_class_init (GrDetailsPageClass *klass)
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, export_button);
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, error_label);
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, error_revealer);
+        gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, temperature_button);
 
         gtk_widget_class_bind_template_callback (widget_class, edit_recipe);
         gtk_widget_class_bind_template_callback (widget_class, delete_recipe);
@@ -436,6 +470,7 @@ gr_details_page_class_init (GrDetailsPageClass *klass)
         gtk_widget_class_bind_template_callback (widget_class, activate_link);
         gtk_widget_class_bind_template_callback (widget_class, dismiss_error);
         gtk_widget_class_bind_template_callback (widget_class, activate_image);
+        gtk_widget_class_bind_template_callback (widget_class, toggle_temperature);
 }
 
 GtkWidget *
diff --git a/src/gr-details-page.ui b/src/gr-details-page.ui
index 882d01f..e108945 100644
--- a/src/gr-details-page.ui
+++ b/src/gr-details-page.ui
@@ -495,6 +495,17 @@
           </object>
         </child>
         <child>
+          <object class="GtkButton" id="temperature_button">
+            <property name="visible">1</property>
+            <property name="use-underline">1</property>
+            <property name="relief">none</property>
+            <property name="focus-on-click">0</property>
+            <property name="label" translatable="yes">🌡</property>
+            <property name="tooltip-text" translatable="yes">Temperature Display Unit</property>
+            <signal name="clicked" handler="toggle_temperature"/>
+          </object>
+        </child>
+        <child>
           <object class="GtkButton" id="export_button">
             <property name="focus-on-click">0</property>
             <property name="use-underline">1</property>