<p>解决方案是使用<code>QProxyStyle</code>重定向文本绘制:</p>
<pre><code>from PyQt5 import QtCore, QtGui, QtWidgets
class TabBar(QtWidgets.QTabBar):
def tabSizeHint(self, index):
s = QtWidgets.QTabBar.tabSizeHint(self, index)
s.transpose()
return s
def paintEvent(self, event):
painter = QtWidgets.QStylePainter(self)
opt = QtWidgets.QStyleOptionTab()
for i in range(self.count()):
self.initStyleOption(opt, i)
painter.drawControl(QtWidgets.QStyle.CE_TabBarTabShape, opt)
painter.save()
s = opt.rect.size()
s.transpose()
r = QtCore.QRect(QtCore.QPoint(), s)
r.moveCenter(opt.rect.center())
opt.rect = r
c = self.tabRect(i).center()
painter.translate(c)
painter.rotate(90)
painter.translate(-c)
painter.drawControl(QtWidgets.QStyle.CE_TabBarTabLabel, opt);
painter.restore()
class TabWidget(QtWidgets.QTabWidget):
def __init__(self, *args, **kwargs):
QtWidgets.QTabWidget.__init__(self, *args, **kwargs)
self.setTabBar(TabBar(self))
self.setTabPosition(QtWidgets.QTabWidget.West)
class ProxyStyle(QtWidgets.QProxyStyle):
def drawControl(self, element, opt, painter, widget):
if element == QtWidgets.QStyle.CE_TabBarTabLabel:
ic = self.pixelMetric(QtWidgets.QStyle.PM_TabBarIconSize)
r = QtCore.QRect(opt.rect)
w = 0 if opt.icon.isNull() else opt.rect.width() + self.pixelMetric(QtWidgets.QStyle.PM_TabBarIconSize)
r.setHeight(opt.fontMetrics.width(opt.text) + w)
r.moveBottom(opt.rect.bottom())
opt.rect = r
QtWidgets.QProxyStyle.drawControl(self, element, opt, painter, widget)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
QtWidgets.QApplication.setStyle(ProxyStyle())
w = TabWidget()
w.addTab(QtWidgets.QWidget(), QtGui.QIcon("zoom.png"), "ABC")
w.addTab(QtWidgets.QWidget(), QtGui.QIcon("zoom-in.png"), "ABCDEFGH")
w.addTab(QtWidgets.QWidget(), QtGui.QIcon("zoom-out.png"), "XYZ")
w.resize(640, 480)
w.show()
sys.exit(app.exec_())
</code></pre>
<p><a href="https://i.stack.imgur.com/wyqHD.png" rel="noreferrer"><img src="https://i.stack.imgur.com/wyqHD.png" alt="enter image description here"/></a></p>