add plugin class

src/main.py

@@ -43,7 +43,7 @@ from .palette_shades import AdwcustomizerPaletteShades
 from .option import AdwcustomizerOption
 from .app_type_dialog import AdwcustomizerAppTypeDialog
 from .custom_css_group import AdwcustomizerCustomCSSGroup
-
+from .plugins_list import AdwcustomizerPluginsList
 
 def to_slug_case(non_slug):
     return re.sub(r"[^0-9a-z]+", "-", anyascii(non_slug).lower()).strip("-")

src/meson.build

@@ -1,5 +1,6 @@
 pkgdatadir = join_paths(get_option('prefix'), get_option('datadir'), meson.project_name())
 moduledir = join_paths(pkgdatadir, 'adwcustomizer')
+pluginsdir = join_paths(pkgdatadir, 'adwcustomizer', 'plugins')
 gnome = import('gnome')
 
 blueprints = custom_target('blueprints',
@@ -45,10 +46,19 @@ adwcustomizer_sources = [
   'main.py',
   'error.py',
   'palette_shades.py',
+  'plugin.py',
+  'plugins_list.py',
+  'setting.py',
   'option.py',
   'window.py',
   'app_type_dialog.py',
   'custom_css_group.py',
 ]
 
+plugins_sources = [
+  'plugins/__init__.py',
+  'plugins/gtk4.py'
+]
+
 install_data(adwcustomizer_sources, install_dir: moduledir)
+install_data(plugins_sources, install_dir: pluginsdir)

src/plugin.py

@@ -0,0 +1,41 @@
+from .setting import AdwcustomizerSetting
+
+class AdwcustomizerPlugin:
+    def __init__(self):
+        self.title = None
+
+        self.colors = None
+        self.palette = None
+
+        # Custom settings shown on a separate view
+        self.custom_settings = {}
+        # A dict to alias parameters to different names
+        # Key is the alias name, value is the parameter name
+        # Parameter can be any key in colors, palette or custom settings
+        self.alias_dict = {}
+
+    def update_builtin_parameters(self, colors, palette):
+        self.colors = colors
+        self.palette = palette
+
+    def load_custom_settings(self, settings):
+        for setting_key, setting in self.custom_settings:
+            self.custom_settings[setting_key].set_value(settings[setting_key])
+
+    def get_custom_settings_for_preset(self):
+        setting_dict = {}
+        for setting_key, setting in self.custom_settings:
+            setting_dict[setting_key] = setting.value
+        return setting_list
+
+    def get_alias_values(self):
+        alias_values = {}
+        for key, value in self.alias_dict.items():
+            alias_values[key] = self.colors.get(value, self.palette.get(value, self.custom_settings.get(value)))
+        return alias_values
+
+    def validate(self):
+        pass
+
+    def apply(self):
+        pass

src/plugins/gtk4.py

@@ -0,0 +1,4 @@
+from adwcustomizer.plugin import AdwcustomizerPlugin
+
+class AdwcustomizerGtk4Plugin(AdwcustomizerPlugin):
+    pass

src/plugins_list.py

@@ -0,0 +1,16 @@
+from .plugins.gtk4 import AdwcustomizerGtk4Plugin
+
+class AdwcustomizerPluginsList:
+    def __init__(self):
+        self.plugins = {
+            "gtk4": AdwcustomizerGtk4Plugin()
+        }
+
+    def load_all_custom_settings(self, settings):
+        for plugin_id, plugin in self.plugins.items():
+            plugin.load_custom_settings(settings[plugin_id])
+
+    def get_all_custom_settings_for_preset(self):
+        custom_settings = {}
+        for plugin_id, plugin in self.plugins.items():
+            custom_settings[plugin_id] = plugin.get_custom_settings_for_preset()

src/setting.py

@@ -0,0 +1,19 @@
+class AdwcustomizerSetting:
+    def __init__(self, name, title, value_type, explanation=None, default_value=None):
+        # TODO supported types:
+        #  text
+        #  integer
+        #  float
+        #  color only
+        #  color shades
+        #  color and text
+        #  code field
+        self.name = name
+        self.title = title
+        self.value_type = value_type
+        self.explanation = explanation
+        self.value = default_value
+
+    def set_value(self, new_value):
+        # TODO checks
+        self.value = new_value