问在QPushButton中对齐图标

EN

self.someButton = QtWidgets.QToolButton()
# ...
self.someButton.setToolButtonStyle(QtCore.Qt.ToolButtonTextUnderIcon)

from PyQt5 import QtCore, QtGui, QtWidgets

class CustomButton(QtWidgets.QPushButton):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._icon = self.icon()
        if not self._icon.isNull():
            super().setIcon(QtGui.QIcon())

    def sizeHint(self):
        hint = super().sizeHint()
        if not self.text() or self._icon.isNull():
            return hint
        style = self.style()
        opt = QtWidgets.QStyleOptionButton()
        self.initStyleOption(opt)
        margin = style.pixelMetric(style.PM_ButtonMargin, opt, self)
        spacing = style.pixelMetric(style.PM_LayoutVerticalSpacing, opt, self)
        # get the possible rect required for the current label
        labelRect = self.fontMetrics().boundingRect(
            0, 0, 5000, 5000, QtCore.Qt.TextShowMnemonic, self.text())
        iconHeight = self.iconSize().height()
        height = iconHeight + spacing + labelRect.height() + margin * 2
        if height > hint.height():
            hint.setHeight(height)
        return hint

    def setIcon(self, icon):
        # setting an icon might change the horizontal hint, so we need to use a 
        # "local" reference for the actual icon and go on by letting Qt to *think*
        # that it doesn't have an icon;
        if icon == self._icon:
            return
        self._icon = icon
        self.updateGeometry()

    def paintEvent(self, event):
        if self._icon.isNull() or not self.text():
            super().paintEvent(event)
            return
        opt = QtWidgets.QStyleOptionButton()
        self.initStyleOption(opt)
        opt.text = ''
        qp = QtWidgets.QStylePainter(self)
        # draw the button without any text or icon
        qp.drawControl(QtWidgets.QStyle.CE_PushButton, opt)

        rect = self.rect()
        style = self.style()
        margin = style.pixelMetric(style.PM_ButtonMargin, opt, self)
        iconSize = self.iconSize()
        iconRect = QtCore.QRect((rect.width() - iconSize.width()) / 2, margin, 
            iconSize.width(), iconSize.height())
        if self.underMouse():
            state = QtGui.QIcon.Active
        elif self.isEnabled():
            state = QtGui.QIcon.Normal
        else:
            state = QtGui.QIcon.Disabled
        qp.drawPixmap(iconRect, self._icon.pixmap(iconSize, state))

        spacing = style.pixelMetric(style.PM_LayoutVerticalSpacing, opt, self)
        labelRect = QtCore.QRect(rect)
        labelRect.setTop(iconRect.bottom() + spacing)
        qp.drawText(labelRect, 
            QtCore.Qt.TextShowMnemonic|QtCore.Qt.AlignHCenter|QtCore.Qt.AlignTop, 
            self.text())


if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = CustomButton('Alles anzeigen', icon=QtGui.QIcon.fromTheme('document-new'))
    w.setIconSize(QtCore.QSize(32, 32))
    w.show()
    sys.exit(app.exec_())

import sys
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import Qt, QSize
from PyQt5.QtWidgets import (QApplication, QWidget, QGridLayout,  
    QToolBar, QAction) 


class Widget(QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        
        add_action = QAction(QIcon("img/add.png"), "Add", self)      
        add_action.triggered.connect(self.addValue)
        sub_action = QAction(QIcon("img/min.png"), "Sub", self)    
        sub_action.triggered.connect(self.subValue)

        toolbar = QToolBar()
        toolbar.setContentsMargins(0, 0, 0, 0)
        toolbar.setToolButtonStyle(Qt.ToolButtonTextBesideIcon | Qt.AlignLeading)
        toolbar.setIconSize(QSize(50, 50))
        toolbar.addAction(add_action)
        toolbar.addAction(sub_action)

        rootGrid = QGridLayout(self)
        rootGrid.addWidget(toolbar)

    def addValue(self):
        print("def addValue:")

    def subValue(self):
        print("def subValue:")
       

if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = Widget()
    main.show()
    sys.exit(app.exec_())