[Add] init cta strategy in thread to avoid ui block

vnpy/app/cta_strategy/engine.py

@@ -8,6 +8,8 @@ from collections import defaultdict
 from pathlib import Path
 from typing import Any, Callable
 from datetime import datetime, timedelta
+from threading import Thread
+from queue import Queue, Empty
 
 from vnpy.event import Event, EventEngine
 from vnpy.trader.engine import BaseEngine, MainEngine
@@ -64,6 +66,9 @@ class CtaEngine(BaseEngine):
         self.stop_order_count = 0   # for generating stop_orderid
         self.stop_orders = {}       # stop_orderid: stop_order
 
+        self.init_thread = None
+        self.init_queue = Queue()
+
     def init_engine(self):
         """
         """
@@ -406,8 +411,26 @@ class CtaEngine(BaseEngine):
         """
         Init a strategy.
         """
+        self.init_queue.put(strategy_name)
+
+        if not self.init_thread:
+            self.init_thread = Thread(target=self._init_strategy)
+            self.init_thread.start()
+
+    def _init_strategy(self):
+        """
+        Init strategies in queue.
+        """
+        while not self.init_queue.empty():
+            strategy_name = self.init_queue.get()
             strategy = self.strategies[strategy_name]
 
+            if strategy.inited:
+                self.write_log(f"{strategy_name}已经完成初始化，禁止重复操作")
+                continue
+
+            self.write_log(f"{strategy_name}开始执行初始化")
+
             # Call on_init function of strategy
             self.call_strategy_func(strategy, strategy.on_init)
 
@@ -428,8 +451,12 @@ class CtaEngine(BaseEngine):
             else:
                 self.write_log(f"行情订阅失败，找不到合约{strategy.vt_symbol}", strategy)
 
+            # Put event to update init completed status.
             strategy.inited = True
             self.put_strategy_event(strategy)
+            self.write_log(f"{strategy_name}初始化完成")
+        
+        self.init_thread = None
 
     def start_strategy(self, strategy_name: str):
         """

vnpy/app/cta_strategy/ui/widget.py

@@ -173,7 +173,7 @@ class StrategyManager(QtWidgets.QFrame):
 
     def init_ui(self):
         """"""
-        self.setMaximumHeight(200)
+        self.setMaximumHeight(300)
         self.setFrameShape(self.Box)
         self.setLineWidth(1)