[英]Why mouseMoveEvent does nothing in PyQt5
我嘗試在PyQt5和Python3.5中使用mouseMoveEvent和mousePressEvent,但是單擊鼠標時什么也沒有。 我的代碼如下,有什么問題嗎?
from PyQt5 import QtWidgets, QtGui, QtCore
class Window(QtWidgets.QMainWindow):
def __init__(self):
QtWidgets.QMainWindow.__init__(self)
widget = QtWidgets.QWidget(self)
layout = QtWidgets.QVBoxLayout(widget)
self.graphicsView = QtWidgets.QGraphicsView()
self.graphicsView.setCursor(QtCore.Qt.CrossCursor)
self.graphicsView.setObjectName("graphicsView")
layout.addWidget(self.graphicsView)
self.setCentralWidget(widget)
def mouseMoveEvent(self, event):
if event.buttons() == QtCore.Qt.NoButton:
print("Simple mouse motion")
elif event.buttons() == QtCore.Qt.LeftButton:
print("Left click drag")
elif event.buttons() == QtCore.Qt.RightButton:
print("Right click drag")
def mousePressEvent(self, event):
if event.button() == QtCore.Qt.LeftButton:
print("Press!")
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
win = Window()
win.show()
sys.exit(app.exec_())
首先,您必須啟用鼠標跟蹤 :
self.graphicsView.setMouseTracking(True)
然后,您可以使用QGraphicsView
的子類:
class GraphicsView(QtWidgets.QGraphicsView):
def mouseMoveEvent(self, event):
if event.buttons() == QtCore.Qt.NoButton:
print("Simple mouse motion")
elif event.buttons() == QtCore.Qt.LeftButton:
print("Left click drag")
elif event.buttons() == QtCore.Qt.RightButton:
print("Right click drag")
super(GraphicsView, self).mouseMoveEvent(event)
def mousePressEvent(self, event):
if event.button() == QtCore.Qt.LeftButton:
print("Press!")
super(GraphicsView, self).mousePressEvent(event)
或安裝一個事件過濾器:
self.graphicsView.viewport().installEventFilter(self)
...
def eventFilter(self, source, event):
if event.type() == QtCore.QEvent.MouseMove:
if event.buttons() == QtCore.Qt.NoButton:
print("Simple mouse motion")
elif event.buttons() == QtCore.Qt.LeftButton:
print("Left click drag")
elif event.buttons() == QtCore.Qt.RightButton:
print("Right click drag")
elif event.type() == QtCore.QEvent.MouseButtonPress:
if event.button() == QtCore.Qt.LeftButton:
print("Press!")
return super(Window, self).eventFilter(source, event)
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