Using proxy model to apply custom file extension filtering to a QFileSystemModel

file_model_filters.py

"""
Example of using a proxy model to apply custom
filtering to a QFileSystemModel

RE: https://groups.google.com/d/topic/python_inside_maya/a2QM_KvgfeI/discussion

Justin Israel
justinisrael@gmail.com
"""
from PySide import QtCore, QtGui 

class Tree(QtGui.QTreeView):

    def __init__(self):
        super(Tree, self).__init__()

        model = QtGui.QFileSystemModel(self)
        model.setReadOnly(True)

        skip_exts = ['.jpg', '.log']
        proxy = HideFileTypesProxy(excludes=skip_exts, parent=self)
        proxy.setDynamicSortFilter(True)
        proxy.setSourceModel(model)

        self.setModel(proxy)

        idx = model.setRootPath("/")
        self.setRootIndex(proxy.mapFromSource(idx))

        self._model = model 
        self._proxy = proxy
        self.resize(600,400)

class HideFileTypesProxy(QtGui.QSortFilterProxyModel):
    """
    A proxy model that excludes files from the view
    that end with the given extension
    """
    def __init__(self, excludes, *args, **kwargs):
        super(HideFileTypesProxy, self).__init__(*args, **kwargs)
        self._excludes = excludes[:]

    def filterAcceptsRow(self, srcRow, srcParent):
        idx = self.sourceModel().index(srcRow, 0, srcParent)
        name = idx.data()

        # Can do whatever kind of tests you want here,
        # against the name
        for exc in self._excludes:
            if name.endswith(exc):
                return False
        
        return True

if __name__ == '__main__':
    app = QtGui.QApplication([])
    tree = Tree()
    tree.show()
    tree.raise_()
    app.exec_()