pyqt5 tabwidget垂直选项卡水平文本左对齐

pyqt5 tabwidget垂直选项卡水平文本左对齐

解决方案是使用

QProxyStyle

重定向文本绘画：

from PyQt5 import QtCore, QtGui, QtWidgetsclass 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_())