Python 带参数的Matplotlib回调函数

Python Matplotlib callback function with parameters

在按钮按下的回调函数中,除了'event'之外,还有没有传递更多的参数?例如,在回调函数中,我想知道按钮的文本(在本例中为 'Next')。我该怎么做?

import matplotlib.pyplot as plt
from matplotlib.widgets import Button

fig = plt.figure()
def next(event):
    # I want to print the text label of the button here, which is 'Next'
    pass


axnext = plt.axes([0.81, 0.05, 0.1, 0.075])
bnext = Button(axnext, 'Next')
bnext.on_clicked(next)
plt.show()

为此,您可能需要将事件处理封装在 class 中,如 official tutorial:

import matplotlib.pyplot as plt
from matplotlib.widgets import Button

class ButtonClickProcessor(object):
    def __init__(self, axes, label):
        self.button = Button(axes, label)
        self.button.on_clicked(self.process)

    def process(self, event):
        print self.button.label

fig = plt.figure()

axnext = plt.axes([0.81, 0.05, 0.1, 0.075])
bnext = ButtonClickProcessor(axnext, "Next")

plt.show()

另一个可能更快的解决方案是使用 lambda 函数:

import matplotlib.pyplot as plt
from matplotlib.widgets import Button

fig = plt.figure()
def next(event, text):
    print(text)
    pass


axnext = plt.axes([0.81, 0.05, 0.1, 0.075])
bnext = Button(axnext, 'Next')
bnext.on_clicked(lambda x: next(x, bnext.label.get_text()))
plt.show()