pyqt5学习之QMainwindow

QmMainwindow：用来创建窗口，窗口可以包含菜单栏，工具栏，状态栏，标题栏

设置状态栏

import sys
from PyQt5.QtWidgets import QMainWindow, QApplication
from PyQt5.QtGui import QIcon

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.resize(400, 200)
        self.status = self.statusBar()  # 创建状态栏
        self.status.showMessage('这是状态栏提示', 5000)  # 在左下方
        #showMessage(message,int timeout = 0(mes))
        self.setWindowTitle('QMainWindow')


if __name__ == '__main__':

    app = QApplication(sys.argv)
    app.setWindowIcon(QIcon('dp.png'))  # 给标题栏添加一个图片
    form = MainWindow()
    form.show()
    sys.exit(app.exec_())

设置屏幕居中

import sys
from PyQt5.QtWidgets import QMainWindow, QApplication,QDesktopWidget
from PyQt5.QtGui import QIcon

# QDesktopWidget：描述显示屏的类

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setWindowTitle('主窗口放在屏幕中间')
        self.resize(370, 250)
        self.center()

    def center(self):
        screen = QDesktopWidget().screenGeometry()  # 获得屏幕的大小
        size = self.geometry()  # 获得QMainwindow窗口的大小
        self.move((screen.width() - size.width()) / 2, (screen.height() - size.height()) / 2)


if __name__ == '__main__':

    app = QApplication(sys.argv)
    app.setWindowIcon(QIcon('dp.png'))  # 给标题栏添加一个图片
    form = MainWindow()
    form.show()
    sys.exit(app.exec_())

关闭窗口

import sys
from PyQt5.QtWidgets import QMainWindow, QApplication,QHBoxLayout,QPushButton,QWidget
from PyQt5.QtGui import QIcon

# QDesktopWidget：描述显示屏的类

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setWindowTitle('关闭主窗口')
        self.btn = QPushButton('按钮')
        self.btn.clicked.connect(self.onbuttonclick)

        layout = QHBoxLayout()
        layout.addWidget(self.btn)

        main_frame = QWidget()
        main_frame.setLayout(layout)
        self.setCentralWidget(main_frame)

    def onbuttonclick(self):
        sender = self.sender()  # sender是发送信号的对象，此处发送信号对象是按钮
        print(sender.text() + '被按下了')
        qApp = QApplication.instance()  # instance()获得当前的实例
        qApp.quit()  # 关闭窗口



if __name__ == '__main__':

    app = QApplication(sys.argv)
    app.setWindowIcon(QIcon('dp.png'))  # 给标题栏添加一个图片
    form = MainWindow()
    form.show()
    sys.exit(app.exec_())