Function check_focus

lib/matplotlib/tests/test_backend_tk.py:225–235

()

    success = []

    def check_focus():
        tkcanvas = fig.canvas.get_tk_widget()
        # Give the plot window time to appear
        if not tkcanvas.winfo_viewable():
            tkcanvas.wait_visibility()
        # Make sure the canvas has the focus, so that it's able to receive
        # keyboard events.
        if tkcanvas.focus_lastfor() == tkcanvas:
            success.append(True)
        plt.close()
        root.destroy()

    root = tk.Tk()
    fig = plt.figure()