完成自定义桥接功能

usr/lib/python3/dist-packages/webengine/gtk3/__init__.py

@@ -8,3 +8,4 @@ from ._version import *
 from ._webengine import WebEngine
 from ._settings import create_setting
 from ._hotreload import create_hmr_server
+from ._custom_bridge import create_bridge

usr/lib/python3/dist-packages/webengine/gtk3/_custom_bridge.py

@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+
+def create_bridge():
+  def wrapper(app, extra = None):
+    app.custom_bridge = extra
+
+  return wrapper

usr/lib/python3/dist-packages/webengine/gtk3/_webengine.py

@@ -73,6 +73,7 @@ class WebEngine(WebKit2.WebView):
 
   root = None
   window = None
+  custom_bridge = None
 
   def __init__(self, window):
 
@@ -200,6 +201,12 @@ class WebEngine(WebKit2.WebView):
       case 'md5':
         output = hashlib.md5(str(params.get('value'))).hexdigest()
 
+      case _:
+        if self.custom_bridge is None:
+          pass
+        else:
+          _error, output = self.custom_bridge(event, params)
+
     # 有回调则返回结果
     if callback:
       self.call_js(callback, output, _error)