pyqt/toolbars_and_menus.py

# Only needed for access to command line arguments
import sys

from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *


# 自定义窗口，继承 QMainWindow
class MainWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.setWindowTitle("My Awesome App")  # 标题

        label = QLabel("THIS IS AWESOME!!!")
        label.setAlignment(Qt.AlignCenter)

        self.setCentralWidget(label)

        toolbar = QToolBar("My main toolbar")
        toolbar.setIconSize(QSize(16, 16))
        self.addToolBar(toolbar)

        button_action = QAction(QIcon("icons/bug.png"), "&Your button", self)
        button_action.setStatusTip("This is your button")
        button_action.triggered.connect(self.onMyToolBarButtonClick)
        button_action.setCheckable(True)
        button_action.setShortcut(QKeySequence("Ctrl+p"))
        toolbar.addAction(button_action)

        toolbar.addSeparator()

        button_action2 = QAction(QIcon("icons/bug.png"), "Your &button2", self)
        button_action2.setStatusTip("This your button2")
        button_action2.triggered.connect(self.onMyToolBarButtonClick)
        button_action2.setCheckable(True)
        toolbar.addAction(button_action2)

        toolbar.addSeparator()
        toolbar.addWidget(QLabel("Hello"))
        toolbar.addWidget(QCheckBox())

        # 状态栏
        self.setStatusBar(QStatusBar(self))

        # 菜单
        menu = self.menuBar()
        file_menu = menu.addMenu("&File")
        file_menu.addAction(button_action)
        file_menu.addSeparator()

        file_submenu = file_menu.addMenu("Submenu")
        file_submenu.addAction(button_action2)

    def onMyToolBarButtonClick(self, s):
        print("click", s)

        dlg = CustomDialog(self)
        if dlg.exec_():
            print("Success!")
        else:
            print("Cancel!")


class CustomDialog(QDialog):

    def __init__(self, *args, **kwargs):
        super(CustomDialog, self).__init__(*args, **kwargs)
        self.setWindowTitle("HELLO!")

        q_btn = QDialogButtonBox.Ok | QDialogButtonBox.Cancel

        self.buttonBox = QDialogButtonBox(q_btn)
        self.buttonBox.accepted.connect(self.accept)
        self.buttonBox.rejected.connect(self.reject)

        self.layout = QHBoxLayout()
        self.layout.addWidget(self.buttonBox)
        self.setLayout(self.layout)


if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = MainWindow()
    window.show()  # 默认下 windows 是隐藏的
    # 开启事件循环
    app.exec_()