PyQt5 QDockWidget - 顶级更改信号

在本文中，我们将了解如何获取 QDockWidget 的顶级更改信号。 QDockWidget 提供了停靠小部件的概念，也称为工具面板或实用程序窗口。停靠窗口是放置在 QMainWindow（原始窗口）中中央小部件周围的停靠小部件区域中的辅助窗口。当浮动属性发生变化时会发出此信号。
如果停靠小部件现在是浮动的，则 topLevel 参数为真；否则为假。

In order to do this we will use topLevelChanged method with the dock widget object.

Syntax : dock.topLevelChanged.connect(method)

Argument : It takes method as argument

Return : It returns None

编程需要懂一点英语

下面是实现

Python3

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 500, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for components
    def UiComponents(self):
  
        # creating dock widget
        dock = QDockWidget(self)
  
        # setting title to the dock widget
        dock.setWindowTitle("GfG Dock")
  
  
        # push button
        push = QPushButton("Press", self)
  
        # setting widget to the dock
        dock.setWidget(push)
  
        # creating a label
        label = QLabel("GeeksforGeeks", self)
  
        # setting geometry to the label
        label.setGeometry(100, 200, 300, 80)
  
        # making label multi line
        label.setWordWrap(True)
  
        # setting geometry tot he dock widget
        dock.setGeometry(100, 0, 200, 30)
  
        # getting top level changed changed signal
        # setting text to the label
        dock.topLevelChanged.connect(lambda: label.setText("Top level Changed Signal Emitted"))
  
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：