如何调整QIcon的大小或缩放？

from PyQt5.QtGui import QIcon, QPixmap
from PyQt5.QtCore import QSize

# 假设你有一个原始的QIcon对象
original_icon = QIcon('path/to/icon.png')

# 创建一个QPixmap对象
pixmap = QPixmap(original_icon.pixmap(QSize(32, 32)))

# 缩放QPixmap到新的尺寸
scaled_pixmap = pixmap.scaled(QSize(64, 64), Qt.KeepAspectRatio, Qt.SmoothTransformation)

# 创建一个新的QIcon对象
scaled_icon = QIcon(scaled_pixmap)

from PyQt5.QtGui import QIconEngine, QPixmap
from PyQt5.QtCore import QSize

class ScaledIconEngine(QIconEngine):
    def __init__(self, pixmap, size):
        super().__init__()
        self.pixmap = pixmap.scaled(size, Qt.KeepAspectRatio, Qt.SmoothTransformation)

    def paint(self, painter, rect, mode, state):
        painter.drawPixmap(rect, self.pixmap)

    def pixmap(self, size, mode, state):
        return self.pixmap

# 使用示例
original_pixmap = QPixmap('path/to/icon.png')
scaled_pixmap = original_pixmap.scaled(QSize(64, 64), Qt.KeepAspectRatio, Qt.SmoothTransformation)
scaled_icon = QIcon(ScaledIconEngine(scaled_pixmap, QSize(64, 64)))