添加菜单栏的组件, 通过点击菜单栏的组件按钮来生成新的窗口, 然后对新的窗口进行重叠或者扩张的操作

MultiWindows.py

"""
容纳多文档的窗口

QMdiArea

QMdiSubWindow

"""

import sys, math
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

class MultiWindows(QMainWindow):
    count = 0

    def __init__(self):
        super(MultiWindows, self).__init__()
        self.setWindowTitle("容纳多文档的窗口")
        #容纳多文档窗口
        self.mdi = QMdiArea()
        self.setCentralWidget(self.mdi)
        bar = self.menuBar()
        file = bar.addMenu("File")
        file.addAction("New")
        file.addAction("cascade")
        file.addAction("Tiled")

        file.triggered.connect(self.windowaction)

    def windowaction(self, q):
        print(q)
        if q.text() == "New":
            MultiWindows.count += 1
            #设置单个的子窗口
            sub = QMdiSubWindow()
            #在子窗口上添加一个文本编辑框
            sub.setWidget(QTextEdit())
            sub.setWindowTitle("子窗口" + str(MultiWindows.count))
            #将子窗口添加到多个窗口控件上
            self.mdi.addSubWindow(sub)
            sub.show()
        elif q.text() == "cascade":
            #设置窗口的缩放方式为重叠
            self.mdi.cascadeSubWindows()
        elif q.text() == 'Tiled':
            #设置窗口的缩放方式为展开
            self.mdi.tileSubWindows()



if __name__ == "__main__":
    app = QApplication(sys.argv)
    main = MultiWindows()
    main.show()

    sys.exit(app.exec_())