# Only needed for access to command line arguments
import sys

from PyQt5.QtGui import QPalette, QColor
from PyQt5.QtWidgets 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

        # pagelayout = QVBoxLayout()
        # button_layout = QHBoxLayout()
        # layout = QStackedLayout()
        #
        # pagelayout.addLayout(button_layout)
        # pagelayout.addLayout(layout)
        #
        # for n, color in enumerate(['red', 'green', 'blue', 'yellow', 'purple']):
        #     btn = QPushButton(str(color))
        #     btn.pressed.connect(lambda n=n: layout.setCurrentIndex(n))
        #     button_layout.addWidget(btn)
        #     layout.addWidget(Color(color))

        tabs = QTabWidget()
        tabs.setDocumentMode(False)
        tabs.setTabPosition(QTabWidget.North)
        tabs.setMovable(True)

        for n, color in enumerate(['red', 'green', 'blue', 'yellow', 'purple']):
            tabs.addTab(Color(color), color)

        self.setCentralWidget(tabs)

    def index_changed(self, s):
        print(s)


class Color(QWidget):
    def __init__(self, color, *args, **kwargs):
        super(Color, self).__init__(*args, **kwargs)
        self.setAutoFillBackground(True)

        palette = self.palette()
        palette.setColor(QPalette.Window, QColor(color))
        self.setPalette(palette)


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_()