Pamhyr: Add update propagation mechanism.

src/View/MainWindow.py

@@ -28,7 +28,7 @@ from PyQt5.QtGui import (
 )
 
 from PyQt5.QtCore import (
-    Qt, QTranslator, QEvent, QUrl,
+    Qt, QTranslator, QEvent, QUrl, QTimer,
 )
 from PyQt5.QtWidgets import (
     QMainWindow, QApplication, QAction,
@@ -140,6 +140,7 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
         self.default_style()
         self.setup_debug_mode(init=True)
         self.setup_results()
+        self.setup_timer()
 
         self.trans = QTranslator(self)
         # self.ui.retranslateUi()
@@ -321,6 +322,31 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
                 menu.removeAction(self.debug_sqlite_action)
                 self.set_debug_lvl(debug=False)
 
+    def setup_timer(self):
+        self._init_propagation_keys()
+
+        self._propagation_timer = QTimer(self)
+        self._propagation_timer.start(2000)
+
+        self._propagation_timer.timeout.connect(
+            self._do_propagate_update
+        )
+
+    def _init_propagation_keys(self):
+        self._propagation_keys = set()
+
+    def _propagate_update(self, key=None):
+        self._propagation_keys.add(key)
+        logger.debug(f"Propagation keys: {self._propagation_keys}")
+
+    def _do_propagate_update(self):
+        for key in self._propagation_keys:
+            logger.debug(f"Propagation of {key}")
+            for _, window in self.sub_win_list:
+                window._propagated_update(key=key)
+
+        self._init_propagation_keys()
+
     #########
     # MODEL #
     #########