在Pyside中的自定义QProgressBar上绘制标记

from PySide2.QtWidgets import QProgressBar
from PySide2.QtGui import QPainter, QColor, QPen
from PySide2.QtCore import Qt

class CustomProgressBar(QProgressBar):
    def __init__(self, parent=None):
        super(CustomProgressBar, self).__init__(parent)

    def paintEvent(self, event):
        # 调用父类的paintEvent方法绘制进度条
        super(CustomProgressBar, self).paintEvent(event)

        # 创建一个QPainter对象
        painter = QPainter(self)

        # 设置标记的颜色和宽度
        painter.setPen(QPen(QColor(255, 0, 0), 2))

        # 计算标记的位置
        marker_position = int(self.width() * 0.5)

        # 绘制标记
        painter.drawLine(marker_position, 0, marker_position, self.height())

# 创建一个自定义的ProgressBar对象
progress_bar = CustomProgressBar()

# 设置进度条的范围和当前值
progress_bar.setRange(0, 100)
progress_bar.setValue(50)

# 将进度条添加到布局中或者窗口中显示
layout.addWidget(progress_bar)