同时使用 Matplotlib Slider 和 key_release_event

Here are some snippets of my code (in no particular order) cut form my source. I hope its clear enough what the functions are doing-

def on_change(val):
    """
    This function updates the LEEM image based on the slider value, val
    This function is also called to update the image when an arrow key release is detected
    """
    global curimg

    curimg = energy_to_filenumber(round(val, 1))
    img = all_dat[0:imheight-1, 0:imwidth-1,
                  curimg]
    leemax.set_title("LEEM Image: " + str(elist[
        int(energy_to_filenumber(round(val, 1)))]) + ' eV')
    leemax.imshow(img, cmap=cm.Greys_r)
    pylab.draw()

def arrow_key_image_control(event):
    """
    This function takes an event from an mpl_connection
    and listens for key release events specifically from
    the keyboard arrow keys (left/right) and uses this
    input to advance/reverse to the next/previous image.
    """
    global curimg

    minindex = 0
    maxindex = all_dat.shape[2] - 1
    if event.key == 'left':
        if curimg - 1 >= minindex:
            curimg -= 1
            on_change(filenumber_to_energy(curimg))

        else:
            pass
    elif event.key == 'right':
        if curimg + 1 <= maxindex:
            curimg += 1
            on_change(filenumber_to_energy(curimg))

        else:
            pass
    else:
        pass


sld_ax = fig.add_axes([0.2, 0.025, 0.75, 0.02])
imsld = Slider(sld_ax, "Electron Energy",
                   elist[0], elist[len(elist)-1], elist[0], valfmt='%1.1f')
imsld.on_changed(on_change)
id2 = fig.canvas.mpl_connect('key_release_event', arrow_key_image_control)

解决方案

感谢@tcaswell 对解决方案的评论