python QstandardItemModel Natural sort

Question

I'm looking for QstandardItemModel Natural Sort Method. I'm reading some relevant question and try to my code. But It didn't work

My tool accept Some File list by Drag and Drop. I want to sort my Model data by Natural sort. and put it to listview.

So Here is my code:

class VideolistView (QtWidgets.QListView):
    def __init__(self, parent):
        super(VideolistView, self).__init__(parent)
        self.setAcceptDrops(True)
        self.setObjectName("VideolistView")
        self.setGeometry(QtCore.QRect(8, 30, 250, 301))
        self.Model = QtGui.QStandardItemModel(self)

    def dragEnterEvent(self, event):
        if event.mimeData().hasUrls:
            event.accept()
        else:
            event.ignore()

    def dragMoveEvent(self, event):
        if event.mimeData().hasUrls:
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event):
        if event.mimeData().hasUrls:
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()

            for url in event.mimeData().urls():
                dropitem = str(url.toLocalFile())
                Fname = os.path.split(dropitem)
                if not self.Model.findItems(Fname[1]):
                    listitem = QtGui.QStandardItem(Fname[1])
                    self.Model.appendRow(listitem)
            self.Model.sort(0)
            self.setModel(self.Model)
        else:
            event.ignore()

Some my attemp announce.

import re

def _human_key(key):
    parts = re.split('(\d*\.\d+|\d+)', key)
    return tuple((e.swapcase() if i % 2 == 0 else float(e))
            for i, e in enumerate(parts))
   ......

    listitems=[]
         for url in event.mimeData().urls():
             dropitem = str(url.toLocalFile())
             Fname = os.path.split(dropitem)
             listitem = QtGui.QStandardItem(Fname[1])
             listitems.appent(listitem)
    listitems.sort(key=_human_key)

Pycharm debug Error listitems.sort(key=_human_key) and I tried reimplement of QstandardItemModel class

import re

def _human_key(key):
    parts = re.split('(\d*\.\d+|\d+)', key)
    return tuple((e.swapcase() if i % 2 == 0 else float(e))
            for i, e in enumerate(parts))
   ......

Class NaturalSortModel (QtGui.QstandardItemModel)
    def __lt__(self, other):
        column = self.treeWidget().sortColumn()
        k1 = self.text(column)
        k2 = other.text(column)
        return _human_key(k1) < _human_key(k2)
               .......
Class VideolistView (QtWidgets.QListView)
    def __init__(self, parent):
       self.Model = self.NaturalSortModel(self)

               ........
            self.Model.appendRow(listitem)
        self.Model.sort(0)
        self.setModel(self.Model)
                ........

above Two code Error. How I do Natural Sort with QstandardItemModel?

link : Python - Human sort of numbers with alpha numeric, but in pyQt and a __lt__ operator

With @eyllanesc Answer, First Solution with QSortFilterProxyModel Work well. It sort data by Natural order.

But @eyllanesc second advice(Qstandarditem inherit) is not work for me. It sort Alphabetically just like original source. @eyllanesc Thank you a lot!!!

Google Search teach to me about List Nature Sort. So I make list with listitem. Listitems.append(listitem) and Listitems.sort(key=nature_sort). but error occured. — abrakad, Oct 05 '17 at 12:17
I do not understand, that is the ordering of lists in python, and it is not only for natural ordering but for any ordering criteria. — eyllanesc, Oct 05 '17 at 12:19
the lists and QStandarItemModel are very different things, I tried although it is not the best but it works, it orders them in a natural way. — eyllanesc, Oct 05 '17 at 12:21
Is it work? My pycharm debug and error. I tried def __lt__(self, other): return naturalkey(self.value, float) < naturalkey(other.value, float) implemet of QStandardItemModel class but Fail... — abrakad, Oct 05 '17 at 12:35
I do not talk about your comment, but about the code you show in your question. — eyllanesc, Oct 05 '17 at 12:36
Why do you get complicated if QStandarItemModel already uses that sort order when you use your_model.sort(your_column)? — eyllanesc, Oct 05 '17 at 13:25
yes. QstandardItemModel sort desending But It's not Natural Order. I want to Sort QstandardItemModel by Natural order. — abrakad, Oct 05 '17 at 13:32
@abrakad. The `__lt__` is supposed to be used in a sub-class of `QStandardItem`, not a model. PS: there are some other errors in your code - you need to use `event.mimeData().hasUrls()` (note the `()` at the end). — ekhumoro, Oct 05 '17 at 14:25

eyllanesc · Accepted Answer · 2017-10-05T23:09:28.630

If you want to establish a particular criterion of order you must do it through a model that inherits from QSortFilterProxyModel and implement the method lessThan as I show below:

class NaturalSortFilterProxyModel(QtCore.QSortFilterProxyModel):
    @staticmethod
    def _human_key(key):
        parts = re.split('(\d*\.\d+|\d+)', key)
        return tuple((e.swapcase() if i % 2 == 0 else float(e)) for i, e in enumerate(parts))

    def lessThan(self, left, right):
        leftData = self.sourceModel().data(left)
        rightData = self.sourceModel().data(right)
        return self._human_key(leftData) < self._human_key(rightData)

class VideolistView (QtWidgets.QListView):
    def __init__(self, parent=None):
        super(VideolistView, self).__init__(parent)
        self.setAcceptDrops(True)
        self.setObjectName("VideolistView")
        self.setGeometry(QtCore.QRect(8, 30, 250, 301))
        model = QtGui.QStandardItemModel(self)
        proxyModel = NaturalSortFilterProxyModel()
        proxyModel.setSourceModel(model)
        proxyModel.sort(0, QtCore.Qt.AscendingOrder)
        self.setModel(proxyModel)

    def dragEnterEvent(self, event):
        if event.mimeData().hasUrls():
            event.accept()
        else:
            event.ignore()

    def dragMoveEvent(self, event):
        if event.mimeData().hasUrls():
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event):
        if event.mimeData().hasUrls():
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()

            for url in event.mimeData().urls():
                dropitem = str(url.toLocalFile())
                Fname = os.path.split(dropitem)
                if not self.model().sourceModel().findItems(Fname[1]):
                    listitem = QtGui.QStandardItem(Fname[1])
                    self.model().sourceModel().appendRow(listitem)
        else:
            event.ignore()

As @ekhumuro says, the solution shown in the link refers to creating a class that inherits from QStandardItem, as I show below

class NaturalStandardItem(QtGui.QStandardItem):
    @staticmethod
    def _human_key(key):
        parts = re.split('(\d*\.\d+|\d+)', key)
        return tuple((e.swapcase() if i % 2 == 0 else float(e)) for i, e in enumerate(parts))
    def __lt__(self, other):
        return self._human_key(self.text()) < self._human_key(other.text())


class VideolistView (QtWidgets.QListView):
    def __init__(self, parent=None):
        super(VideolistView, self).__init__(parent)
        self.setAcceptDrops(True)
        self.setObjectName("VideolistView")
        self.setGeometry(QtCore.QRect(8, 30, 250, 301))
        model = QtGui.QStandardItemModel(self)
        self.setModel(model)


    def dragEnterEvent(self, event):
        if event.mimeData().hasUrls():
            event.accept()
        else:
            event.ignore()

    def dragMoveEvent(self, event):
        if event.mimeData().hasUrls():
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event):
        if event.mimeData().hasUrls():
            event.setDropAction(QtCore.Qt.CopyAction)
            event.accept()

            for url in event.mimeData().urls():
                dropitem = str(url.toLocalFile())
                Fname = os.path.split(dropitem)
                if not self.model().findItems(Fname[1]):
                    listitem = NaturalStandardItem(Fname[1])
                    self.model().appendRow(listitem)
            self.model().sort(0)

        else:
            event.ignore()

Thanky your Help. I didn't test this code yet. But I think It work well. after I test it I note my question. — abrakad, Oct 06 '17 at 00:32

python QstandardItemModel Natural sort

1 Answers1