达到100％时改变条形颜色的优雅方式

Question

我要问的是，达到100％时是否有更优雅的方法来更改QProgessBar的条形颜色。在下面的Python代码中，我使用了2 QPalette。背景颜色和条形颜色的default_palette低于100％，达到100％时的green_palette。

main.py

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.uic import loadUi
from PyQt5.QtGui import QPalette
from PyQt5.QtCore import Qt


class MainWindow(QMainWindow):

    def __init__(self, parent=None):
        super().__init__(parent)
        loadUi("mainwindow.ui", self)

        self.default_palette = QPalette(self.palette())
        self.default_palette.setColor(QPalette.Highlight, Qt.blue)
        self.default_palette.setColor(QPalette.Base, Qt.red)

        self.green_palette = QPalette(self.palette())
        self.green_palette.setColor(QPalette.Highlight, Qt.green)

        self.progressBar.setPalette(self.default_palette)

    def update_bar(self, value):
        self.progressBar.setValue(value)
        if value >= 100:
            self.progressBar.setPalette(self.green_palette)
        else:
            self.progressBar.setPalette(self.default_palette)


def main():
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    main_window.horizontalSlider.valueChanged.connect(main_window.update_bar)
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>700</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Progress Bar Colors</string>
  </property>
  <property name="locale">
   <locale language="English" country="UnitedKingdom"/>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QGridLayout" name="gridLayout_2">
    <item row="0" column="0">
     <layout class="QGridLayout" name="gridLayout">
      <item row="0" column="0">
       <spacer name="verticalSpacer">
        <property name="orientation">
         <enum>Qt::Vertical</enum>
        </property>
        <property name="sizeHint" stdset="0">
         <size>
          <width>20</width>
          <height>40</height>
         </size>
        </property>
       </spacer>
      </item>
      <item row="1" column="0">
       <widget class="QProgressBar" name="progressBar">
        <property name="styleSheet">
         <string notr="true"/>
        </property>
        <property name="value">
         <number>50</number>
        </property>
       </widget>
      </item>
      <item row="2" column="0">
       <widget class="QSlider" name="horizontalSlider">
        <property name="maximum">
         <number>100</number>
        </property>
        <property name="value">
         <number>50</number>
        </property>
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
        </property>
       </widget>
      </item>
      <item row="3" column="0">
       <spacer name="verticalSpacer_2">
        <property name="orientation">
         <enum>Qt::Vertical</enum>
        </property>
        <property name="sizeHint" stdset="0">
         <size>
          <width>20</width>
          <height>40</height>
         </size>
        </property>
       </spacer>
      </item>
     </layout>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>700</width>
     <height>28</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>