如何为 QTreeWidgetItem 添加彩色动画？

Question

我需要向 QTreeWidgetItem 添加彩色动画，但在我的代码中，它会引发一些错误，有人可以帮助我吗？代码示例在这里：class TreeWigetItem(QTreeWidgetItem):    def __init__(self, parent=None):        super().__init__(parent)    @pyqtProperty(QBrush)    def bcolor(self):        return self.background(0)    @bcolor.setter    def bcolor(self, color):        self.setBackground(0, color)        self.setBackground(1, color)并像这样调用方法：child_item = TreeWigetItem()self.child_item_ani = QPropertyAnimation(child_item, b'bcolor')self.child_item_ani.setDuration(1000)self.child_item_ani.setEndValue(QBrush(Qt.red))self.child_item_ani.start()这里的错误：self.child_item_ani = QPropertyAnimation(child_item, b'bcolor')  TypeError: arguments did not match any overloaded call:    QPropertyAnimation(parent: QObject = None): argument 1 has unexpected type 'TreeWigetItem'    QPropertyAnimation(QObject, Union[QByteArray, bytes, bytearray], parent: QObject = None): argument 1 has unexpected type 'TreeWigetItem'  

Answer 1

属性（PyQt 中的pyqtProperty）仅在 QObjects 中有效，但在这种情况下QTreeWidgetItem不会从 QObject 继承，因此QPropertyAnimation也不起作用。因此，QPropertyAnimation您应该使用QVariantAnimation如下所示的，而不是使用：

import os

from PyQt5 import QtCore, QtGui, QtWidgets

class TreeWidgetItem(QtWidgets.QTreeWidgetItem):

    @property

    def animation(self):

        if not hasattr(self, "_animation"):

            self._animation = QtCore.QVariantAnimation()

            self._animation.valueChanged.connect(self._on_value_changed)

        return self._animation

    def _on_value_changed(self, color):

        for i in range(self.columnCount()):

            self.setBackground(i, color)

if __name__ == "__main__":

    import sys

    app = QtWidgets.QApplication(sys.argv)

    w = QtWidgets.QTreeWidget(columnCount=2)

    it = TreeWidgetItem(["Foo", "Bar"])

    # setup animation

    it.animation.setStartValue(QtGui.QColor("white"))

    it.animation.setEndValue(QtGui.QColor("red"))

    it.animation.setDuration(5 * 1000)

    it.animation.start()

    # add item to QTreeWidget

    w.addTopLevelItem(it)

    w.show()

    sys.exit(app.exec_())