python - 如果结果为 True，如何获得绿色矩形；如果 result = (paper == dict_k) 中结果为 False，如何获得红色框？

Question

我正在尝试添加 id 文本和矩形，如果结果为 True，则添加绿色；如果结果为 false，则添加红色。我可以从实时数据中获取文本中的 id，但没有获取带有颜色的矩形。有人可以帮我解决这个问题吗？当我删除矩形 block 时，我可以获得 id 和 True/False 结果

from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel
from PyQt5.QtCore import QTimer
import sys
from PyQt5.QtGui import QPainter, QBrush, QPen
from PyQt5.QtCore import Qt


class MainWindow(QMainWindow):
  # constructor
  def __init__(self):
    QMainWindow.__init__(self)
    # counter
    # self.i = 0
    # add QLabel
    self.top = 150
    self.left = 150
    self.width = 1000
    self.height = 1000
    self.qLbl = QLabel('Not yet initialized')
    self.setCentralWidget(self.qLbl)
    # make QTimer
    self.qTimer = QTimer()
    # set interval to 1 s
    self.qTimer.setInterval(1000) # 1000 ms = 1 s
    # connect timeout signal to signal handler
    # label.setFont(QFont('Arial', 20))
    self.setStyleSheet("QLabel {font: 16pt Arial}")
    self.qTimer.timeout.connect(self.getSensorValue)
    self.qTimer.timeout.connect(self.paintevent)

    # start timer
    self.qTimer.start()


  def getSensorValue(self):
    # self.i += 1
    # print('%d. call of getSensorValue()' % self.i)
    id = 'ID1123'
    t = neo4jconnection(paper_id=id)
    paper = neo4jresultparser(t)
    dict_k = jsonfilereader(paper_id=id)  # probably not need it
    result = (paper == dict_k)
    self.qLbl.setText((id +" "+str( result)))

def paintEvent(self, event):
    painter = QPainter(self)
    painter.setPen(QPen(Qt.green, 5, Qt.SolidLine))
    painter.setBrush(QBrush(Qt.green, Qt.SolidPattern))
    painter.drawRect(40, 40, 400, 200)


qApp = QApplication(sys.argv)
# setup GUI
qWin = MainWindow()
qWin.setGeometry(100, 100, 1000, 1000)
qWin.show()
# run application
sys.exit(qApp.exec_())

Answer 1

你不应该直接调用paintEvent，而应该通过update()或repaint()方法，另一方面，颜色必须是类的一个属性，根据result的值改变，然后调用update():

class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setStyleSheet("QLabel {font: 16pt Arial}")
        self.qLbl = QLabel("Not yet initialized")
        self.setCentralWidget(self.qLbl)

        self.qTimer = QTimer()
        self.qTimer.setInterval(1000)
        self.qTimer.timeout.connect(self.getSensorValue)
        self.qTimer.start()

        self.color = QColor()

    def getSensorValue(self):
        id_ = "ID1123"
        t = neo4jconnection(paper_id=id_)
        paper = neo4jresultparser(t)
        dict_k = jsonfilereader(paper_id=id_)
        result = paper == dict_k
        self.qLbl.setText("{} {}".format(id_, result))
        self.color = QColor("green") if result else QColor("red")
        self.update()

    def paintEvent(self, event):
        if self.color.isValid():
            painter = QPainter(self)
            painter.setPen(QPen(self.color, 5, Qt.SolidLine))
            painter.setBrush(QBrush(self.color, Qt.SolidPattern))
            painter.drawRect(40, 40, 400, 200)