将QFileSystemModel与QSortFilterProxyModel组合时崩溃

Question

我有QFileSystemModel和QSortFilterProxyModel。当我试图调用QfileSysteModel.filePath获取文件的当前索引时，错误出现为core Dump。这是一段代码

    le = QLineEdit()
    lv = QListView()

    file_model = QFileSystemModel()
    file_model.setRootPath(QtCore.QDir.rootPath())

    proxy_model = QSortFilterProxyModel(
        recursiveFilteringEnabled=True,
        filterRole=QtWidgets.QFileSystemModel.FileNameRole)
    proxy_model.setSourceModel(file_model)
    lv.setModel(self.proxy_model)

它工作得很好，但当我尝试调用QFileSystemModel核心转储的任何方法时。比如说

filepath  = file_model.filePath(lv.currentIndex())

我如何使用QfileSystemModel的任何方法

from PyQt5 import QtCore, QtGui, QtWidgets


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

        le = QtWidgets.QLineEdit()
        self.lv = QtWidgets.QListView()

        self.file_model = QtWidgets.QFileSystemModel()
        self.file_model.setRootPath(QtCore.QDir.rootPath())

        self.proxy_model = QtCore.QSortFilterProxyModel(
            recursiveFilteringEnabled=True,
            filterRole=QtWidgets.QFileSystemModel.FileNameRole)
        self.proxy_model.setSourceModel(self.file_model)
        self.lv.setModel(self.proxy_model)
        root_index = self.file_model.index(QtCore.QDir.rootPath())
        proxy_index = self.proxy_model.mapFromSource(root_index)
        self.lv.setRootIndex(proxy_index)
        self.lv.doubleClicked.connect(self.navigate)

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(le)
        lay.addWidget(self.lv)


    def navigate(self):

        # Get the path of file or folder
        filepath  = self.file_model.filePath(self.lv.currentIndex())
        print(filepath)


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

Answer 1

使用代理模型时，代理的ModelIndex与源模型中的索引不同。使用^{}将代理模型转换为源模型

在您的情况下，它可能如下所示：

# alternative one: do not reference proxy_model directly
filepath = file_model.filePath(lv.model().mapToSource(lv.currentIndex()))
# alternative two:
filepath = file_model.filePath(self.proxy_model.mapToSource(lv.currentIndex()))