Add trove auto save function

trovedb/qgui/tool_basic_editor.py

@@ -1,5 +1,6 @@
 """Tool Supporting Basic Editor Functions"""
 from typing import cast, Protocol
+from PySide6.QtCore import QTimer
 from PySide6.QtWidgets import QTextEdit, QVBoxLayout
 
 import trovedb.trove as tr
@@ -16,7 +17,33 @@ class ToolBasicEditor(Tool):
 
         self._text_edit = QTextEdit()
         layout.addWidget(self._text_edit)
+
+        self._content_dirty = False
+        self._auto_save_timer = QTimer(self)
+        self._auto_save_timer.setSingleShot(True)
+        self._auto_save_timer.setInterval(2000)  # 2 seconds after typing stops
+        self._auto_save_timer.timeout.connect(self._perform_auto_save)
+
+        self._text_edit.textChanged.connect(self._schedule_auto_save)
+
         self.refresh()
 
     def refresh(self):
         self._text_edit.setPlainText(self.note.read_content().decode("utf-8"))
+        self._content_dirty = False
+
+    def _schedule_auto_save(self):
+        self._content_dirty = True
+        self._auto_save_timer.stop()
+        self._auto_save_timer.start()
+
+    def _perform_auto_save(self):
+        if self._content_dirty:
+            content = self._text_edit.toPlainText().encode("utf-8")
+            self.note.write_content(content)
+            self._content_dirty = False
+
+    def closeEvent(self, event):
+        if self._content_dirty:
+            self._perform_auto_save()
+        super().closeEvent(event)