"""
=======================
Figure Axes Enter Leave
=======================

Illustrate the figure and axes enter and leave events by changing the
frame colors on enter and leave
"""
import matplotlib.pyplot as plt


def on_enter_axes(event):
    print('enter_axes', event.inaxes)
    event.inaxes.patch.set_facecolor('yellow')
    event.canvas.draw()


def on_leave_axes(event):
    print('leave_axes', event.inaxes)
    event.inaxes.patch.set_facecolor('white')
    event.canvas.draw()


def on_enter_figure(event):
    print('enter_figure', event.canvas.figure)
    event.canvas.figure.patch.set_facecolor('red')
    event.canvas.draw()


def on_leave_figure(event):
    print('leave_figure', event.canvas.figure)
    event.canvas.figure.patch.set_facecolor('grey')
    event.canvas.draw()

###############################################################################

fig1, (ax, ax2) = plt.subplots(2, 1)
fig1.suptitle('mouse hover over figure or axes to trigger events')

fig1.canvas.mpl_connect('figure_enter_event', on_enter_figure)
fig1.canvas.mpl_connect('figure_leave_event', on_leave_figure)
fig1.canvas.mpl_connect('axes_enter_event', on_enter_axes)
fig1.canvas.mpl_connect('axes_leave_event', on_leave_axes)

###############################################################################

fig2, (ax, ax2) = plt.subplots(2, 1)
fig2.suptitle('mouse hover over figure or axes to trigger events')

fig2.canvas.mpl_connect('figure_enter_event', on_enter_figure)
fig2.canvas.mpl_connect('figure_leave_event', on_leave_figure)
fig2.canvas.mpl_connect('axes_enter_event', on_enter_axes)
fig2.canvas.mpl_connect('axes_leave_event', on_leave_axes)

plt.show()