IsSignalConnected

.settings/org.eclipse.core.resources.prefs

@@ -6,6 +6,7 @@ encoding//Demo/FacePoints.py=utf-8
 encoding//Demo/FollowWindow.py=utf-8
 encoding//Demo/FramelessDialog.py=utf-8
 encoding//Demo/FramelessWindow.py=utf-8
+encoding//Demo/IsSignalConnected.py=utf-8
 encoding//Demo/Lib/Application.py=utf-8
 encoding//Demo/Lib/FramelessWindow.py=utf-8
 encoding//Demo/NativeEvent.py=utf-8

Demo/IsSignalConnected.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2019年2月24日
+@author: Irony
+@site: https://pyqt5.com https://github.com/892768447
+@email: 892768447@qq.com
+@file: IsSignalConnected
+@description: 判断信号是否连接
+"""
+
+from PyQt5.QtWidgets import QWidget, QVBoxLayout, QPushButton, QTextBrowser
+
+
+__Author__ = """By: Irony
+QQ: 892768447
+Email: 892768447@qq.com"""
+__Copyright__ = 'Copyright (c) 2019 Irony'
+__Version__ = 1.0
+
+
+class Window(QWidget):
+
+    def __init__(self, *args, **kwargs):
+        super(Window, self).__init__(*args, **kwargs)
+        layout = QVBoxLayout(self)
+        self.button1 = QPushButton('已连接', self, clicked=self.doTest)
+        self.button2 = QPushButton('未连接', self)
+        self.retView = QTextBrowser(self)
+        layout.addWidget(self.button1)
+        layout.addWidget(self.button2)
+        layout.addWidget(self.retView)
+
+    def doTest(self):
+        self.retView.append("""
+        # button1 clicked 是否连接: %s
+        # button2 clicked 是否连接: %s
+        """ % (
+            self.isSignalConnected(self.button1, 'clicked()'),
+            self.isSignalConnected(self.button2, 'clicked()')
+        ))
+
+    def isSignalConnected(self, obj, name):
+        """判断信号是否连接
+        :param obj:        对象
+        :param name:       信号名，如 clicked()
+        """
+        index = obj.metaObject().indexOfMethod(name)
+        if index > -1:
+            method = obj.metaObject().method(index)
+            if method:
+                return obj.isSignalConnected(method)
+        return False
+
+
+if __name__ == '__main__':
+    import sys
+    from PyQt5.QtWidgets import QApplication
+    app = QApplication(sys.argv)
+    w = Window()
+    w.show()
+    sys.exit(app.exec_())

Demo/README.md

@@ -19,6 +19,7 @@
   - [背景连线动画](#17、背景连线动画)
   - [无边框圆角对话框](#18、无边框圆角对话框)
   - [调整窗口显示边框](#19、调整窗口显示边框)
+  - [判断信号是否连接](#20、判断信号是否连接)
 
 ## 1、重启窗口Widget
 [运行 RestartWindow.py](RestartWindow.py)
@@ -195,3 +196,10 @@ PyQt 结合 Opencv 进行人脸检测；
 好处在于可以减少窗口更新的次数（用途有频繁渲染的界面）
 
 ![ShowFrameWhenDrag](ScreenShot/ShowFrameWhenDrag.gif)
+
+## 20、判断信号是否连接
+[运行 IsSignalConnected.py](IsSignalConnected.py)
+
+通过 `isSignalConnected` 判断是否连接
+
+![IsSignalConnected](ScreenShot/IsSignalConnected.png)

README.md

@@ -182,6 +182,7 @@ https://pyqt5.com 社区是专门针对PyQt5学习和提升开设的博客网站
   - [人脸特征点](Demo/FacePoints.py)
   - [使用Threading](Demo/QtThreading.py)
   - [背景连线动画](Demo/CircleLine.py)
+  - [判断信号是否连接](Demo/IsSignalConnected.py)
 
 # QQ群