pyqt 状态机简单例子

from PyQt5.QtCore import (pyqtSignal,QPointF,QPoint,QPropertyAnimation,QRect,
                          QRectF,QState,QEasingCurve,QStateMachine,Qt)
from PyQt5.QtWidgets import (QApplication,QGraphicsScene,QGraphicsWidget,
                            QGraphicsView,QPushButton,QDialog,QFormLayout)
from PyQt5.QtGui import QPixmap,QPainterPath,QPainter
import sys

class Button(QGraphicsWidget):

    clicked=pyqtSignal()

    def __init__(self,parent_arg=None):
        super(Button,self).__init__(parent_arg)

    def mousePressEvent(self,ev):
        self.clicked.emit()
        self.update()

    def boundingRect(self):
        return QRectF(0,0,100,50)

    # def shape(self):
    #     path=QPainterPath()
    #     path.addEllipse(self.boundingRect())
    #     return path

    def paint(self,painter,option,widget):
        r=self.boundingRect()
        painter.setPen(Qt.darkGray)
        painter.setBrush(Qt.yellow)
        painter.drawEllipse(r)

if __name__=='__main__':
    app=QApplication(sys.argv)

    button=Button()
    #所有的状态都有一个共同的父亲节点
    machine=QStateMachine()

    state1=QState(machine)
    state2=QState(machine)
    state3=QState(machine)


    #状态中的矩形区域是将原来控件的原点与目标的中的（x,y）两点相对齐
    state1.assignProperty(button,'geometry',QRect(0,0,100,50))
    state2.assignProperty(button,'geometry',QRect(100,0,100,50))
    state3.assignProperty(button,'geometry',QRect(200,0,100,50))


    state1.addTransition(button.clicked,state2)

    state2.addTransition(button.clicked,state3)

    state3.addTransition(button.clicked,state1)

    machine.setInitialState(state2)
    machine.start()

    scene=QGraphicsScene(0,0,300,100)
    scene.addItem(button)

    view=QGraphicsView(scene)
    view.show()

    button.show()
    sys.exit(app.exec_())

参考了这篇文章Qt状态机QStateMachine使用