通过点击图形:
self.canvas.Fig.canvas.mpl_connect('button_press_event', self.button_press)
我可以接收信号并通过在状态栏中打印“按下按钮”来生成答案:
self.statusBar().showMessage("Key pressed", 400)
但由于某种原因,同样的代码片段对于按键(键盘)按下无效:
self.canvas.Fig.canvas.mpl_connect('key_press_event', self.key_press)
消息“按键已按下”不会出现,这意味着没有事件发生或者没有接收到信号。
这是包含所有基本类的MWE:
import sys
import matplotlib
matplotlib.use("Qt5Agg")
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow, QSizePolicy
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
class MyMplCanvas(FigureCanvas):
def __init__(self, parent=None, width=5, height=4, dpi=100,data=[[]],timedelay=[],wavelength=[]):
self.Fig = Figure(figsize=(width, height), dpi=dpi)
self.Dataplot = self.Fig.add_subplot(111)
self.compute_initial_figure(data,timedelay, wavelength)
FigureCanvas.__init__(self, self.Fig)
self.setParent(parent)
FigureCanvas.setSizePolicy(self,QSizePolicy.Expanding,QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
def compute_initial_figure(self,data,timedelay,wavelength):
pass
class MyStaticMplCanvas(MyMplCanvas):
def __init__(self, *args, **kwargs):
MyMplCanvas.__init__(self, *args, **kwargs)
def compute_initial_figure(self,data,timedelay,wavelength):
self.Dataplot.set_xlabel('Wavelength, nm')
self.Dataplot.set_ylabel('Time delay, ~s')
class GraphView(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self.main_widget = QtWidgets.QWidget(self)
self.canvas = MyStaticMplCanvas(self.main_widget, width=8, height=8, dpi=100,data=[[]],timedelay=[],wavelength=[])
self.canvas.Fig.canvas.mpl_connect('key_press_event', self.key_press)
self.canvas.Fig.canvas.mpl_connect('button_press_event', self.button_press)
self.layoutMain = QtWidgets.QHBoxLayout(self.main_widget)
self.layoutFigure = QtWidgets.QHBoxLayout()
self.layoutMain.addLayout(self.layoutFigure)
self.layoutFigure.addWidget(self.canvas)
self.main_widget.setFocus()
self.setCentralWidget(self.main_widget)
def key_press(self,event):
self.statusBar().showMessage("Key pressed", 400)
def button_press(self,event):
self.statusBar().showMessage("Button pressed", 400)
def main():
app = QApplication( sys.argv )
a=GraphView()
a.show()
app.exec()
if __name__ == '__main__':
sys.exit(main())
我的代码出了什么问题?