如您所见，画布不是由Qt处理，而是由matplotlib处理，因此解决方案是使用该库提供的事件，如果您查看文档，会发现存在以下事件：
'button_press_event' MouseEvent - mouse button is pressed
'button_release_event' MouseEvent - mouse button is released
'draw_event' DrawEvent - canvas draw (but before screen update)
'key_press_event' KeyEvent - key is pressed
'key_release_event' KeyEvent - key is released
'motion_notify_event' MouseEvent - mouse motion
'pick_event' PickEvent - an object in the canvas is selected
'resize_event' ResizeEvent - figure canvas is resized
'scroll_event' MouseEvent - mouse scroll wheel is rolled
'figure_enter_event' LocationEvent - mouse enters a new figure
'figure_leave_event' LocationEvent - mouse leaves a figure
'axes_enter_event' LocationEvent - mouse enters a new axes
'axes_leave_event' LocationEvent - mouse leaves an axes
在您的情况下，您应该使用以下事件：
例：
from PyQt5 import QtWidgets
from matplotlib.backends.backend_qt5agg import figureCanvasQTAgg as figureCanvas
from matplotlib.figure import figure
class MplWidget(QtWidgets.QWidget):
def __init__(self, parent=None):
super(MplWidget, self).__init__(parent)
self.canvas = figureCanvas(figure())
vertical_layout = QtWidgets.QV@R_11_2419@Layout(self)
vertical_layout.addWidget(self.canvas)
self.canvas.axes = self.canvas.figure.add_subplot(111)
self.canvas.mpl_connect("button_press_event", self.on_press)
self.canvas.mpl_connect("button_release_event", self.on_release)
self.canvas.mpl_connect("motion_notify_event", self.on_move)
def on_press(self, event):
print("press")
print("event.xdata", event.xdata)
print("event.ydata", event.ydata)
print("event.inaxes", event.inaxes)
print("x", event.x)
print("y", event.y)
def on_release(self, event):
print("release:")
print("event.xdata", event.xdata)
print("event.ydata", event.ydata)
print("event.inaxes", event.inaxes)
print("x", event.x)
print("y", event.y)
def on_move(self, event):
print("move")
print("event.xdata", event.xdata)
print("event.ydata", event.ydata)
print("event.inaxes", event.inaxes)
print("x", event.x)
print("y", event.y)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MplWidget()
w.show()
sys.exit(app.exec_())
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