PyQt QFileDialog - 多目录选择

Question

I am trying to create a QFileDialog that allows the user to select multiple directories.

Following the discussion here and the faq here , but I'm not sure what I'm doing wrong. I get a file dialog, but it still only lets me select a single directory (folder).

This is on Windows 7

Code:

class FileDialog(QtGui.QFileDialog):
        def __init__(self, *args):
            QtGui.QFileDialog.__init__(self, *args)
            self.setOption(self.DontUseNativeDialog, True)
            self.setFileMode(self.DirectoryOnly)

            self.tree = self.findChild(QtGui.QTreeView)
            self.tree.setSelectionMode(QtGui.QAbstractItemView.MultiSelection)

            self.list = self.findChild(QtGui.QListView)
            self.list.setSelectionMode(QtGui.QAbstractItemView.MultiSelection)

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    ex = FileDialog()
    ex.show()
    sys.exit(app.exec_())

Edit:

So after playing around with this some more, if I select "Detail View" in the file dialog, multiselection works. However, if I select "List View" it does not work. Any idea why?

Answer 1

The example code from the FAQ is not robust, because it assumes the dialog only has one QListView and one QTreeView . The behaviour of findChild is indeterminate when there are several direct child objects: so it was probably just pure luck that it ever worked.

A more robust solution would be to reset the selection mode on any view for which the type of its model is a QFileSystemModel :

for view in self.findChildren((QtGui.QListView, QtGui.QTreeView)):
    if isinstance(view.model(), QtGui.QFileSystemModel):
        view.setSelectionMode(QtGui.QAbstractItemView.MultiSelection)