[gnome-builder] prefs: implement font button

[Christian Hergert <chergert src gnome org>]

commit c0459b340bb9d9cc9674730648d19dd5b53f8c50
Author: Christian Hergert <chergert redhat com>
Date:   Sat Nov 7 01:10:37 2015 -0800

    prefs: implement font button

 data/ui/ide-preferences-font-button.ui           |   31 ++++++-
 libide/preferences/ide-preferences-font-button.c |  118 ++++++++++++++++++++--
 2 files changed, 138 insertions(+), 11 deletions(-)
---
diff --git a/data/ui/ide-preferences-font-button.ui b/data/ui/ide-preferences-font-button.ui
index ccf5243..50ff3c4 100644
--- a/data/ui/ide-preferences-font-button.ui
+++ b/data/ui/ide-preferences-font-button.ui
@@ -3,7 +3,7 @@
   <!-- interface-requires gtk+ 3.18 -->
   <template class="IdePreferencesFontButton" parent="IdePreferencesContainer">
     <child>
-      <object class="GtkBox">
+      <object class="GtkBox" id="box">
         <property name="orientation">horizontal</property>
         <property name="spacing">18</property>
         <property name="visible">true</property>
@@ -34,4 +34,33 @@
       </object>
     </child>
   </template>
+  <object class="GtkPopover" id="popover">
+    <property name="relative-to">box</property>
+    <property name="position">bottom</property>
+    <property name="width-request">600</property>
+    <property name="border-width">12</property>
+    <child>
+      <object class="GtkBox">
+        <property name="orientation">vertical</property>
+        <property name="spacing">12</property>
+        <property name="visible">true</property>
+        <child>
+          <object class="GtkFontChooserWidget" id="chooser">
+            <property name="visible">true</property>
+          </object>
+        </child>
+        <child>
+          <object class="GtkButton" id="confirm">
+            <property name="halign">end</property>
+            <property name="label" translatable="yes">_Select</property>
+            <property name="use-underline">true</property>
+            <property name="visible">true</property>
+            <style>
+              <class name="suggested-action"/>
+            </style>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
 </interface>
diff --git a/libide/preferences/ide-preferences-font-button.c 
b/libide/preferences/ide-preferences-font-button.c
index ecb247d..dbf90d3 100644
--- a/libide/preferences/ide-preferences-font-button.c
+++ b/libide/preferences/ide-preferences-font-button.c
@@ -20,15 +20,18 @@
 
 struct _IdePreferencesFontButton
 {
-  GtkBin     parent_instance;
-
-  GSettings *settings;
-  gchar     *schema_id;
-  gchar     *key;
-
-  GtkLabel  *title;
-  GtkLabel  *font_family;
-  GtkLabel  *font_size;
+  GtkBin                parent_instance;
+
+  GSettings            *settings;
+  gchar                *schema_id;
+  gchar                *key;
+
+  GtkLabel             *title;
+  GtkLabel             *font_family;
+  GtkLabel             *font_size;
+  GtkPopover           *popover;
+  GtkButton            *confirm;
+  GtkFontChooserWidget *chooser;
 };
 
 G_DEFINE_TYPE (IdePreferencesFontButton, ide_preferences_font_button, IDE_TYPE_PREFERENCES_CONTAINER)
@@ -41,7 +44,36 @@ enum {
   LAST_PROP
 };
 
+enum {
+  ACTIVATE,
+  LAST_SIGNAL
+};
+
 static GParamSpec *properties [LAST_PROP];
+static guint signals [LAST_SIGNAL];
+
+static void
+ide_preferences_font_button_show (IdePreferencesFontButton *self)
+{
+  gchar *font = NULL;
+
+  g_assert (IDE_IS_PREFERENCES_FONT_BUTTON (self));
+
+  font = g_settings_get_string (self->settings, self->key);
+  g_object_set (self->chooser, "font", font, NULL);
+  g_free (font);
+
+  gtk_widget_show (GTK_WIDGET (self->popover));
+}
+
+static void
+ide_preferences_font_button_activate (IdePreferencesFontButton *self)
+{
+  g_assert (IDE_IS_PREFERENCES_FONT_BUTTON (self));
+
+  if (!gtk_widget_get_visible (GTK_WIDGET (self->popover)))
+    ide_preferences_font_button_show (self);
+}
 
 static void
 ide_preferences_font_button_changed (IdePreferencesFontButton *self,
@@ -183,6 +215,15 @@ ide_preferences_font_button_class_init (IdePreferencesFontButtonClass *klass)
   object_class->get_property = ide_preferences_font_button_get_property;
   object_class->set_property = ide_preferences_font_button_set_property;
 
+  signals [ACTIVATE] =
+    g_signal_new_class_handler ("activate",
+                                G_TYPE_FROM_CLASS (klass),
+                                G_SIGNAL_RUN_LAST,
+                                G_CALLBACK (ide_preferences_font_button_activate),
+                                NULL, NULL, NULL, G_TYPE_NONE, 0);
+
+  widget_class->activate_signal = signals [ACTIVATE];
+
   properties [PROP_KEY] =
     g_param_spec_string ("key",
                          "Key",
@@ -207,13 +248,70 @@ ide_preferences_font_button_class_init (IdePreferencesFontButtonClass *klass)
   g_object_class_install_properties (object_class, LAST_PROP, properties);
 
   gtk_widget_class_set_template_from_resource (widget_class, 
"/org/gnome/builder/ui/ide-preferences-font-button.ui");
-  gtk_widget_class_bind_template_child (widget_class, IdePreferencesFontButton, title);
+  gtk_widget_class_bind_template_child (widget_class, IdePreferencesFontButton, chooser);
+  gtk_widget_class_bind_template_child (widget_class, IdePreferencesFontButton, confirm);
   gtk_widget_class_bind_template_child (widget_class, IdePreferencesFontButton, font_family);
   gtk_widget_class_bind_template_child (widget_class, IdePreferencesFontButton, font_size);
+  gtk_widget_class_bind_template_child (widget_class, IdePreferencesFontButton, popover);
+  gtk_widget_class_bind_template_child (widget_class, IdePreferencesFontButton, title);
+}
+
+static gboolean
+transform_to (GBinding     *binding,
+              const GValue *value,
+              GValue       *to_value,
+              gpointer      user_data)
+{
+  g_value_set_boolean (to_value, !!g_value_get_boxed (value));
+  return TRUE;
+}
+
+static void
+ide_preferences_font_button_clicked (IdePreferencesFontButton *self,
+                                     GtkButton                *button)
+{
+  g_autofree gchar *font = NULL;
+
+  g_assert (IDE_IS_PREFERENCES_FONT_BUTTON (self));
+  g_assert (GTK_IS_BUTTON (button));
+
+  g_object_get (self->chooser, "font", &font, NULL);
+  g_settings_set_string (self->settings, self->key, font);
+  gtk_widget_hide (GTK_WIDGET (self->popover));
+}
+
+static void
+ide_preferences_font_button_font_activated (IdePreferencesFontButton *self,
+                                            const gchar              *font,
+                                            GtkFontChooser           *chooser)
+{
+  g_assert (IDE_IS_PREFERENCES_FONT_BUTTON (self));
+  g_assert (GTK_IS_FONT_CHOOSER (chooser));
+
+  g_settings_set_string (self->settings, self->key, font);
+  gtk_widget_hide (GTK_WIDGET (self->popover));
 }
 
 static void
 ide_preferences_font_button_init (IdePreferencesFontButton *self)
 {
   gtk_widget_init_template (GTK_WIDGET (self));
+
+  g_object_bind_property_full (self->chooser, "font-desc",
+                               self->confirm, "sensitive",
+                               G_BINDING_SYNC_CREATE,
+                               transform_to,
+                               NULL, NULL, NULL);
+
+  g_signal_connect_object (self->chooser,
+                           "font-activated",
+                           G_CALLBACK (ide_preferences_font_button_font_activated),
+                           self,
+                           G_CONNECT_SWAPPED);
+
+  g_signal_connect_object (self->confirm,
+                           "clicked",
+                           G_CALLBACK (ide_preferences_font_button_clicked),
+                           self,
+                           G_CONNECT_SWAPPED);
 }