PyQt5 QDockWidget – 顶层变化信号

在这篇文章中，我们将看到如何获得QDockWidget的顶层变化信号。QDockWidget提供了dock widgets的概念，也被称为工具调色板或实用窗口。停靠窗口是放置在QMainWindow(原始窗口)中中央部件周围的停靠部件区域的二级窗口。当浮动属性发生变化时，这个信号就会被发射出来。如果dock widget现在是浮动的，topLevel参数为真；否则，为假。

为了做到这一点，我们将使用dock widget对象的topLevelChanged方法。

语法： dock.topLevelChanged.connect(method)

参数： 它接受方法作为参数

返回： 它返回无。

以下是实现方法

# 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 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())