Font chooser widget: add option to specify the level of font selectio…

…n. (#16)

A filter function was added in the case where the style level is not set because gtk's built in filter for that case is currently broken (see comment in the code).

xapp/SettingsWidgets.py

@@ -429,7 +429,7 @@ class FontButton(SettingsWidget):
     bind_prop = "font-name"
     bind_dir = Gio.SettingsBindFlags.DEFAULT
 
-    def __init__(self, label, size_group=None, dep_key=None, tooltip=""):
+    def __init__(self, label, level=(Gtk.FontChooserLevel.STYLE | Gtk.FontChooserLevel.SIZE), size_group=None, dep_key=None, tooltip=""):
         super(FontButton, self).__init__(dep_key=dep_key)
 
         self.label = SettingsLabel(label)
@@ -445,6 +445,27 @@ def __init__(self, label, size_group=None, dep_key=None, tooltip=""):
         if size_group:
             self.add_to_size_group(size_group)
 
+        if not (level & Gtk.FontChooserLevel.STYLE):
+            # the level mechanism is broken in gtk - choosing a level that doesn't include styles (italics, bold, etc)
+            # results in a list that only has one variant per family, but in many cases the selected font is bold or
+            # italicized (but not consistenly), which is not only confusing, but kind of defeats the purpose. To work
+            # around that, we supply our own filter function that removes the variants correctly. If it ever gets fixed
+            # in gtk, this parsing function can be removed and the level argument added directly to the font button.
+            def filter_func(fam, face):
+                face_text = face.get_face_name().lower()
+                for keyword in ['bold', 'italic', 'oblique']:
+                    if keyword in face_text:
+                        return False
+
+                return True
+
+            self.content_widget.set_filter_func(filter_func)
+
+            # add the style level to avoid the issues above - it's because we're already filtering them out manually
+            level |= Gtk.FontChooserLevel.STYLE
+
+        self.content_widget.set_level(level)
+
 class Range(SettingsWidget):
     bind_prop = "value"
     bind_dir = Gio.SettingsBindFlags.GET | Gio.SettingsBindFlags.NO_SENSITIVITY