使用“sourceModel()”作为“fileInfo()”时应用程序突然终止

Question

某些上下文：

我做了qtreeview，set qfilesystemmodel作为其模型。有2个树景，右边的一个在目录中的项目文件列表中对应，左侧一个用于该项目文件的连接文件的视图。有了帮助，我已经实现了这种行为，当我在右侧单击项目文件时，其连接的文件将出现在左侧。 （我删除了存储的机制和连接的文件，因为它将添加大量代码）

问题：

在添加上面的2个TreeViews之后，我添加了一个上下文菜单只有一个选项，即删除所选文件。我认为我的第一次尝试在左侧是成功的，因为我可以看到控制台上印刷的路径。现在，当我尝试在右侧进行操作时，问题就在于。知道这一侧的模型是从QSortFilterProxymodel subseral子分类的，然后我添加了sourcemodel（），以便它将返回qfilesystemmodelmodel。但是，当我尝试运行文件时，它只是给了我一个错误。您可以在下面看到我的实现。

def deleteFile(self, event):
        index_list = self.tree_sender.selectedIndexes()
        for index in index_list:
            if index.column() == 0:
                if isinstance(self.tree_sender.model(), ModifiedQSortFilterProxyModel)
                    fileIn = self.tree_sender.model().sourceModel().fileInfo(index) 
                else:
                    fileIn = self.tree_sender.model().fileInfo(index)

                # method above is also not working even I add sourceModel()
                # It just ends the app imediately

                path_to_delete = fileIn.absoluteFilePath()
                print(path_to_delete)

我的测试代码：

    import sys

from PyQt5.QtWidgets import QApplication, QWidget, QTreeView, QFileSystemModel, QHBoxLayout, \
    QVBoxLayout, QPushButton, QListWidget, QListWidgetItem, QMenu, QAction, QAbstractItemView
from PyQt5.QtCore import QSortFilterProxyModel, Qt
from PyQt5.QtGui import QCursor

class ModifiedQSortFilterProxyModel(QSortFilterProxyModel):

    fileInfo = None
    con_files = None
    def filterAcceptsRow(self, source_row, source_parent):
        if not self.fileInfo:
            return True

        source_index = self.sourceModel().index(source_row, 0, source_parent)
        info = self.sourceModel().fileInfo(source_index)

        if self.fileInfo.absolutePath() != info.absolutePath():
            return True
        return info.fileName() in self.con_files

    def setFilter(self, info, connected_files):
        self.fileInfo = info
        self.con_files = connected_files
        self.invalidateFilter()

class FileSystemView(QWidget):
    def __init__(self):
        super().__init__()

        appWidth = 800
        appHeight = 300
        self.setWindowTitle('File System Viewer')
        self.setGeometry(300, 300, appWidth, appHeight)
        
        dir_path = r'<your directory>'

        # -- left -- #
        self.model = QFileSystemModel()
        self.model.setRootPath(dir_path)
        self.tree =  QTreeView()
        self.tree.setModel(self.model)
        self.tree.setRootIndex(self.model.index(dir_path))
        self.tree.setColumnWidth(0, 250)
        self.tree.setAlternatingRowColors(True)
        self.tree.setSelectionMode(QAbstractItemView.ExtendedSelection)
        
        self.tree.clicked.connect(self.onClicked)

        self.tree.setContextMenuPolicy(Qt.CustomContextMenu)
        self.tree.customContextMenuRequested.connect(self.context_menu)

        # -- right -- #
        self.model2 = QFileSystemModel()
        self.model2.setRootPath(dir_path)
        self.model2.setReadOnly(False)

        self.filter_proxy_model = ModifiedQSortFilterProxyModel()
        self.filter_proxy_model.setSourceModel(self.model2)
        self.filter_proxy_model.setFilterCaseSensitivity(Qt.CaseInsensitive)
        self.filter_proxy_model.setDynamicSortFilter(True)
        self.filter_proxy_model.setFilterKeyColumn(0)
        root_index = self.model2.index(dir_path)
        proxy_index = self.filter_proxy_model.mapFromSource(root_index)

        self.tree2 =  QTreeView()
        self.tree2.setModel(self.filter_proxy_model)
        self.tree2.setRootIndex(proxy_index)
        self.tree2.setColumnWidth(0, 250)
        self.tree2.setAlternatingRowColors(True)
        self.tree2.setSelectionMode(QAbstractItemView.ExtendedSelection)

        self.tree2.setContextMenuPolicy(Qt.CustomContextMenu)
        self.tree2.customContextMenuRequested.connect(self.context_menu)

        # -- layout -- #
        self.tree_layout = QHBoxLayout()
        self.tree_layout.addWidget(self.tree)
        self.tree_layout.addWidget(self.tree2)

        self.setLayout(self.tree_layout)

    def context_menu(self, event):
        self.tree_sender = self.sender()
        # ^^^ I dont know how to access the treeview where context menu 
        # ^^^ is triggered so I just tried to pass it as a variable

        self.menu = QMenu(self)
        deleteAction = QAction('Delete', self)
        deleteAction.triggered.connect(lambda event: self.deleteFile(event))
        self.menu.addAction(deleteAction)
        self.menu.popup(QCursor.pos())
    
    def deleteFile(self, event):
        index_list = self.tree_sender.selectedIndexes()
        for index in index_list:
            if index.column() == 0:
                if isinstance(self.tree_sender.model(), ModifiedQSortFilterProxyModel):
                    fileIn = self.tree_sender.model().sourceModel().fileInfo(index) 
                else:
                    fileIn = self.tree_sender.model().fileInfo(index)

                # method above is also not working even I add sourceModel()
                # It just ends the app imediately

                path_to_delete = fileIn.absoluteFilePath()
                print(path_to_delete)

    def onClicked(self, index):
        print("onclick")
        connected_files = [] # list of connected files
        self.filter_proxy_model.setFilter(self.model.fileInfo(index), connected_files)

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

我的问题：是什么原因导致错误？是sourcemodel（）实现吗？还是我做错了什么？

我希望有人可以指出正确的方向。

Answer 1

我完全忘记使用 mapToSource，但幸运的是 @musicamante 指导我完成了它。现在我的问题已经解决了，下面给出了 deleteFile 方法的最终实现。

def deleteFile(self, event):
        index_list = self.tree_sender.selectedIndexes()
        for index in index_list:
            if index.column() == 0:
                model = self.tree_sender.model()

                if isinstance(model, ModifiedQSortFilterProxyModel):
                    proxy_index = model.mapToSource(index)
                    fileIn = proxy_index.model().fileInfo(proxy_index)
                else:
                    fileIn = model.fileInfo(index)
    
                path_to_delete = fileIn.absoluteFilePath()
                print(path_to_delete)