matplotlib 挂接到 save_figure 按钮事件

Question

有谁知道如何从 matplotlib 图形中获取 'save figure' 按钮事件？

我需要事件来在按下此按钮时调用我的一些功能。

import matplotlib.pyplot as plt
from matplotlib.backend_bases import NavigationToolbar2

save_figure = NavigationToolbar2.save_figure

def new_save(self, *args, **kwargs):
  print( 'save_event')
  # save_figure(self, *args, **kwargs)

NavigationToolbar2.save_figure = new_save


fig = plt.figure()
plt.text(0.35, 0.5, 'Hello world!', dict(size=30))
plt.show()

但是如果我按下 save figure 它不会调用我的函数 new_save

Answer 1

matplotlib.backend_bases.NavigationToolbar2 does not implement a save_figure method. This method is implemented in each of the backends specifically. E.g. for the Qt5Agg backend this is here。因此，您需要对正在使用的实际后端的相应方法进行猴子修补。对于 Qt5Agg 后端，这可能看起来像这样：

import matplotlib
matplotlib.use("Qt5Agg")
import matplotlib.pyplot as plt
from matplotlib.backends.backend_qt5 import NavigationToolbar2QT

save_figure = NavigationToolbar2QT.save_figure

def new_save(self, *args, **kwargs):
  print('save_event')
  save_figure(self, *args, **kwargs)

NavigationToolbar2QT.save_figure = new_save

fig = plt.figure()
plt.text(0.35, 0.5, 'Hello world!', dict(size=30))
plt.show()

matplotlib 挂接到 save_figure 按钮事件

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