<p>一种可能的解决方案是在QProgressBar中创建一个新属性,该属性显示了另一种改进,要进行绘制,我们可以使用QProxyStyle:</p>
<pre><code>from PyQt5 import QtCore, QtGui, QtWidgets
class ProxyStyle(QtWidgets.QProxyStyle):
def drawControl(self, element, option, painter, widget):
if element == QtWidgets.QStyle.CE_ProgressBar:
super(ProxyStyle, self).drawControl(element, option, painter, widget)
if hasattr(option, 'alternative'):
alternative = option.alternative
last_value = option.progress
last_pal = option.palette
last_rect = option.rect
option.progress = alternative
pal = QtGui.QPalette()
# alternative color
pal.setColor(QtGui.QPalette.Highlight, QtCore.Qt.red)
option.palette = pal
option.rect = self.subElementRect(QtWidgets.QStyle.SE_ProgressBarContents, option, widget)
self.proxy().drawControl(QtWidgets.QStyle.CE_ProgressBarContents, option, painter, widget)
option.progress = last_value
option.palette = last_pal
option.rect = last_rect
return
super(ProxyStyle, self).drawControl(element, option, painter, widget)
class ProgressBar(QtWidgets.QProgressBar):
def paintEvent(self, event):
painter = QtWidgets.QStylePainter(self)
opt = QtWidgets.QStyleOptionProgressBar()
if hasattr(self, 'alternative'):
opt.alternative = self.alternative()
self.initStyleOption(opt)
painter.drawControl(QtWidgets.QStyle.CE_ProgressBar, opt)
@QtCore.pyqtSlot(int)
def setAlternative(self, value):
self._alternative = value
self.update()
def alternative(self):
if not hasattr(self, '_alternative'):
self._alternative = 0
return self._alternative
class Actions(QtWidgets.QDialog):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setWindowTitle('Progress Bar')
self.objectsToProcess = 100
self.objectsProcessed = 0
self.objectsVerified = 0
self.progress_bar = ProgressBar(maximum=self.objectsToProcess)
self.process_btn = QtWidgets.QPushButton('Process')
self.verify_btn = QtWidgets.QPushButton('Verify')
self.process_btn.clicked.connect(self.process)
self.verify_btn.clicked.connect(self.verify)
lay = QtWidgets.QGridLayout(self)
lay.addWidget(self.progress_bar, 0, 0, 1, 2)
lay.addWidget(self.process_btn, 1, 0)
lay.addWidget(self.verify_btn, 1, 1)
def process(self):
if self.objectsProcessed + 1 < self.objectsToProcess:
self.objectsProcessed += 1
self.progress_bar.setValue(self.objectsProcessed)
def verify(self):
if self.objectsVerified < self.objectsProcessed:
self.objectsVerified += 1
self.progress_bar.setAlternative(self.objectsVerified)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
app.setStyle(ProxyStyle(app.style()))
w = Actions()
w.show()
sys.exit(app.exec_())
</code></pre>
<p><a href="https://i.stack.imgur.com/EE2pE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EE2pE.png" alt="enter image description here"/></a></p>