python - 如何设置绘制文本的背景颜色？

Question

我想设置文本的背景，这意味着我想设置包含文本的矩形的颜色。我已经测试了 QPainter.setBackground，但它不起作用。这是我的代码:

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class MyLabel(QLabel):
    def __init__(self):
        super(MyLabel, self).__init__()
        self.setMinimumHeight(200)
        self.setMinimumWidth(200)

    def paintEvent(self, QPaintEvent):
        super(MyLabel, self).paintEvent(QPaintEvent)
        pos = QPoint(50, 50)
        painter = QPainter(self)

        brush = QBrush()
        brush.setColor(QColor(255,0,0))

        painter.setBackgroundMode(Qt.OpaqueMode)
        painter.setBackground(brush)

        painter.drawText(pos, 'hello,world')

class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        layout = QHBoxLayout(self)
        self.label = MyLabel()
        layout.addWidget(self.label)


if __name__ == '__main__':

    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

我想要的是:

感谢您的帮助。

Answer 1

没必要实现个性化的QLabel，通过Qt Style Sheet设置背景色就够了，如果要建立某个位置也不要使用布局

import sys
from PyQt5 import QtCore, QtGui, QtWidgets


class Window(QtWidgets.QWidget):
    def __init__(self):
        super(Window, self).__init__()

        self.label = QtWidgets.QLabel("hello,world", self)
        self.label.adjustSize()
        self.label.setStyleSheet(
            "background-color: {};".format(QtGui.QColor(255, 0, 0).name())
        )
        self.label.move(QtCore.QPoint(50, 50))

if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.resize(640, 480)
    window.show()
    sys.exit(app.exec_())