PyQt5中QGraphicsScene获取mousePressEvent事件鼠标位置全都为0.0 - 知否问答 - 万象云+社区

#这是继承QGraphicsScene的自定义类 class CARscene(QtWidgets.QGraphicsScene): def __init__(self, parent=None): super(CARscene, self).__init__(parent) def mousePressEvent(self, QMouseEvent): #这行代码是期望显示坐标，奈何永远都是[0.0, 0.0] print([QMouseEvent.pos().x(), QMouseEvent.pos().y()]) #这是主窗口的类，继承自QtDesigner设计的界面 class CDataMingQtUi(QtWidgets.QMainWindow, Ui_MainWindow): def __init__(self): super(CDataMingQtUi, self).__init__() self.setupUi(self) #CARgraphview 是一个QGraphicView的实例 self.figure = plt.figure() self.canvas = FigureCanvas(self.figure) self.graph_sence = CARscene() self.graph_sence.addWidget(self.canvas) self.CARgraphview.setScene(self.graph_sence)

self.mouseDownButton = QGraphicsSceneMouseEvent(self, None, None, None, Qt.LeftButton, 0, 0) self.mouseDownButton.setScene(self.scene) self.connect(self.mouseDownButton, QtCore.SIGNAL("button_press_event(QGraphicsSceneMouseEvent*)"), self.on_mouse_down) self.connect(self.mouseDownButton, QtCore.SIGNAL("button_release_event(QGraphicsSceneMouseEvent*)"), self.on_mouse_release) def on_mouse_down(self, event): x = event.pos().x() y = event.pos().y() print(f"鼠标按下位置：({x:.2f}, {y:.2f})") self.scene.lockFocus() self.scene.mousePressEvent(QGraphicsSceneMouseEvent(self, event.pos(), event.pos(), event.pos(), Qt.LeftButton, 0, 0)) self.scene.unlockFocus() self.mouseUpButton = QGraphicsSceneMouseEvent(self, None, None, None, Qt.LeftButton, 0, 0) self.mouseUpButton.setScene(self.scene) self.connect(self.mouseUpButton, QtCore.SIGNAL("button_press_event(QGraphicsSceneMouseEvent*)"), self.on_mouse_up) self.connect(self.mouseUpButton, QtCore.SIGNAL("button_release_event(QGraphicsSceneMouseEvent*)"), self.on_mouse_release) def on_mouse_up(self, event): x = event.pos().x() y = event.pos().y() print(f"鼠标释放位置：({x:.2f}, {y:.2f})") self.scene.lockFocus() self.scene.mouseReleaseEvent(QGraphicsSceneMouseEvent(self, event.pos(), event.pos(), event.pos(), Qt.LeftButton, 0, 0)) self.scene.unlockFocus() self.mouseDownButton = QGraphicsSceneMouseEvent(self, None, None, None, Qt.LeftButton, 0, 0) self.mouseDownButton.setScene(self.scene) self.connect(self.mouseDownButton, QtCore.SIGNAL("button_press_event(QGraphicsSceneMouseEvent*)"), self.on_mouse_down) self.connect(self.mouseDownButton, QtCore.SIGNAL("button_release_event(QGraphicsSceneMouseEvent*)"), self.on_mouse_release) if __name__ == "__main__": app = QApplication([]) exmw = ExampleMainWindow() exmw.show() app.exec_()

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