import sys

from PyQt5.QtWidgets import QMainWindow, QTabWidget, QApplication

from layout_colorwidget import Color


class MainWindow(QMainWindow):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("My App")

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

        for color in ["red", "green", "blue", "yellow"]:
            tabs.addTab(Color(color), color)

        self.setCentralWidget(tabs)


app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())