CmbSourceView: bind buffer style with CmbWindow::source-style

Add property to change GtkSourceView style

cambalache/app/cmb_window.py

@@ -27,7 +27,7 @@ import os
 import locale
 import tempfile
 
-from gi.repository import GLib, GObject, Gio, Gdk, Gtk, Pango, Adw
+from gi.repository import GLib, GObject, Gio, Gdk, Gtk, Pango, Adw, GtkSource
 from .cmb_tutor import CmbTutor, CmbTutorState
 from . import cmb_tutorial
 
@@ -120,6 +120,9 @@ class CmbWindow(Adw.ApplicationWindow):
     intro_button = Gtk.Template.Child()
     menu_button = Gtk.Template.Child()
 
+    # Properties
+    source_style = GObject.Property(type=GtkSource.StyleScheme, flags=GObject.ParamFlags.READWRITE)
+
     # Settings
     completed_intro = GObject.Property(type=bool, default=False, flags=GObject.ParamFlags.READWRITE)
 
@@ -302,6 +305,10 @@ class CmbWindow(Adw.ApplicationWindow):
         self.__load_window_state()
         self.__update_actions()
 
+        self.source_style_manager = GtkSource.StyleSchemeManager.get_default()
+        app.props.style_manager.connect("notify::dark", lambda o, p: self.__update_dark_mode(app.props.style_manager))
+        self.__update_dark_mode(app.props.style_manager)
+
         # Bind preview
         hide_placeholders_button = Gtk.ToggleButton(tooltip_text=_("Hide placeholders"), icon_name="view-conceal-symbolic")
         self.type_chooser.content.append(hide_placeholders_button)
@@ -472,6 +479,14 @@ class CmbWindow(Adw.ApplicationWindow):
         self.np_ui_entry.set_sensitive(sensitive)
         self.__update_action_new()
 
+    def __update_dark_mode(self, style_manager):
+        if style_manager.props.dark:
+            self.source_style = self.source_style_manager.get_scheme("Adwaita-dark")
+            self.add_css_class("dark")
+        else:
+            self.remove_css_class("dark")
+            self.source_style = self.source_style_manager.get_scheme("Adwaita")
+
     def __np_name_to_ui(self, binding, value):
         if len(value):
             return value.lower().rsplit(".", 1)[0] + ".ui"

cambalache/control/cmb_source_view.py

@@ -23,7 +23,7 @@
 # SPDX-License-Identifier: LGPL-2.1-only
 #
 
-from gi.repository import GObject, GtkSource
+from gi.repository import GObject, Gtk, GtkSource
 
 
 class CmbSourceView(GtkSource.View):
@@ -38,6 +38,27 @@ class CmbSourceView(GtkSource.View):
         self.props.buffer = self.buffer
         self.buffer.connect("changed", self.__on_buffer_changed)
 
+        self.connect("notify::root", self.__on_parent_notify)
+        self.__source_style_binding = None
+
+    def __on_parent_notify(self, obj, pspec):
+        if self.__source_style_binding:
+            self.__source_style_binding.unbind()
+            self.__source_style_binding = None
+
+        root = self.props.root
+        if root is None:
+            return
+
+        if isinstance(root, Gtk.ApplicationWindow) and hasattr(root, "source_style"):
+            self.__source_style_binding = GObject.Object.bind_property(
+                root,
+                "source-style",
+                self.buffer,
+                "style-scheme",
+                GObject.BindingFlags.SYNC_CREATE,
+            )
+
     @GObject.Property(type=str)
     def lang(self):
         language = self.buffer.get_language()