Scroll frame with MouseWheel

[Nemesis]

Hi,

I would like to make a widget to pass picture with scroll button. Below is my code however I cannot pass images while scroll button is working. Any idea how to change it? Thanks in advance.

root = tkinter.Tk()
root.wm_title("Try MouseWheel")

def imageShow():

    global fig
    fig = Figure()
    fig.add_subplot().imshow(imageDim[:, :, slide], cmap='gray', vmin=minInt, vmax=maxInt)
    canvas = FigureCanvasTkAgg(fig, master=root)
    canvas.draw()
    canvas.get_tk_widget().pack(side=tkinter.TOP, fill=tkinter.BOTH, expand='true')
    root.bind("<MouseWheel>", mouse_wheel)



def clearfig():
    fig.clear()


def mouse_wheel(event):
    global slide
    print(slide)
    # respond to Linux or Windows wheel event

    if event.num == 5 or event.delta == -120:
        slide -= 1

    if event.num == 4 or event.delta == 120:
        slide += 1
    clearfig()

imageShow()
root.mainloop()