Move property handling to settings.py

As requested by Kai, removed style-scheme property handling from
filediff.py and moved it to meld.settings. Now meld.buffer just listens
to the changed signal of meld.settings and just changes scheme as a
response. Also moved scheme lookup to meld.settings.

Author: mrpdaemon

meld/filediff.py

@@ -852,9 +852,6 @@ def load_font(self):
     def on_setting_changed(self, settings, key):
         if key == 'font':
             self.load_font()
-        elif key == 'style-scheme':
-            for i in range(3):
-                self.textview[i].get_buffer().change_style_scheme(meldsettings.style_scheme)
 
     def check_save_modified(self, label=None):
         response = Gtk.ResponseType.OK

meld/meldbuffer.py

@@ -24,7 +24,7 @@
 from gi.repository import GtkSource
 
 from meld.conf import _
-from meld.settings import bind_settings,settings
+from meld.settings import bind_settings,meldsettings
 from meld.util.compat import text_type
 
 
@@ -41,12 +41,12 @@ def __init__(self, filename=None):
         bind_settings(self)
         self.data = MeldBufferData(filename)
         self.user_action_count = 0
-        self.change_style_scheme(settings.get_string('style-scheme'))
+        meldsettings.connect('changed', self.on_setting_changed)
+        GtkSource.Buffer.set_style_scheme(self, meldsettings.style_scheme)
 
-    def change_style_scheme(self, scheme):
-        manager = GtkSource.StyleSchemeManager.get_default()
-        style = GtkSource.StyleSchemeManager.get_scheme(manager, scheme)
-        GtkSource.Buffer.set_style_scheme(self, style)
+    def on_setting_changed(self, meldsettings, key):
+        if key == 'style-scheme':
+            GtkSource.Buffer.set_style_scheme(self, meldsettings.style_scheme)
 
     def do_begin_user_action(self, *args):
         self.user_action_count += 1

meld/settings.py

@@ -19,6 +19,7 @@
 from gi.repository import GLib
 from gi.repository import GObject
 from gi.repository import Pango
+from gi.repository import GtkSource
 
 import meld.conf
 import meld.filters
@@ -41,6 +42,7 @@ def __init__(self):
         self.on_setting_changed(settings, 'filename-filters')
         self.on_setting_changed(settings, 'text-filters')
         self.on_setting_changed(settings, 'use-system-font')
+        self.style_scheme = self._style_scheme_from_gsettings()
         settings.connect('changed', self.on_setting_changed)
 
     def on_setting_changed(self, settings, key):
@@ -56,9 +58,14 @@ def on_setting_changed(self, settings, key):
             self.font = self._current_font_from_gsetting()
             self.emit('changed', 'font')
         elif key in ('style-scheme'):
-            self.style_scheme = settings.get_string('style-scheme')
+            self.style_scheme = self._style_scheme_from_gsettings()
             self.emit('changed', 'style-scheme')
 
+    def _style_scheme_from_gsettings(self):
+        manager = GtkSource.StyleSchemeManager.get_default()
+        return GtkSource.StyleSchemeManager.get_scheme(manager,
+                settings.get_string('style-scheme'))
+
     def _filters_from_gsetting(self, key, filt_type):
         filter_params = settings.get_value(key)
         filters = [