Question

我对QT很新。按钮点击后我试图绘制一些矩形。 paintEvent方法似乎工作但按钮点击后没有任何反应我想我需要以某种方式更新mainWindow。代码：

from PyQt5 import QtCore, QtGui, uic, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QApplication
from PyQt5.QtGui import QPainter, QColor, QBrush

qtCreatorFile = "gui.ui" # Enter file here.

#This is where you add the file you created earlier. It is loaded using the inbuilt function
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)

class MyApp(QtWidgets.QMainWindow):

    pridat_slide = False

    def __init__(self):
        super(MyApp, self).__init__()
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.pridaj_slide.clicked.connect(self.pridaj_slide)


    def pridaj_slide(self):
        self.pridat_slide = True

    def paintEvent(self, e):
        qp = QPainter()
        qp.begin(self)
        self.drawRectangles(qp)
        qp.end()

    def drawRectangles(self, qp):
        if self.pridat_slide:
            print ("test");

            qp.setBrush(QColor(200, 0, 0))
            qp.drawRect(10, 15, 90, 60)

            qp.setBrush(QColor(255, 80, 0, 160))
            qp.drawRect(130, 15, 90, 60)

            qp.setBrush(QColor(25, 0, 90, 200))
            qp.drawRect(250, 15, 90, 60)
            self.update()
            self.pridat_slide = False

if __name__ == "__main__":
    try:
        app = QtWidgets.QApplication(sys.argv)
        window = MyApp()
        window.show()
        sys.exit(app.exec_())

屏幕："test" is printed

感谢您的任何建议和帮助;改进。

解决

问题出在MainWindow的背景色中。我删除了background-color: rgb(145,145,145);并且矩形已经启动。

Answer 1

您可以拨打self.repaint()来更新paintEvent功能中的显示（它会再次拨打pridaj_slide）：

def pridaj_slide(self):
    self.pridat_slide = True
    self.repaint()

PyQt5在paintEvent之后更新MainWindow

1 个答案: