[Mod] make CodeEditor singleton

vnpy/trader/ui/editor.py

@@ -8,6 +8,14 @@ class CodeEditor(QtWidgets.QMainWindow):
     """"""
     NEW_FILE_NAME = "Untitled"
 
+    _instance = None
+
+    def __new__(cls, *args, **kwargs):
+        """"""
+        if not cls._instance:
+            cls._instance = QtWidgets.QMainWindow.__new__(cls, *args, **kwargs)
+        return cls._instance
+
     def __init__(self, main_engine=None, event_engine=None):
         """"""
         super().__init__()
@@ -441,8 +449,6 @@ if __name__ == "__main__":
     from vnpy.trader.ui import create_qapp
 
     app = create_qapp()
-
     editor = CodeEditor()
     editor.show()
-
     app.exec_()

vnpy/trader/ui/mainwindow.py

@@ -143,7 +143,7 @@ class MainWindow(QtWidgets.QMainWindow):
             help_menu,
             "代码编辑",
             "editor.ico",
-            partial(self.open_widget, CodeEditor, "editor"),
+            partial(self.open_widget, CodeEditor, "editor")
         )
         self.add_toolbar_action(
             "代码编辑",