[PySide] QListWidget problem

[Harold Mills]

I'm having a problem with the PySide QListWidget class, described in detail
in the example program below. Briefly, a list configured to allow
contiguous selections (but not single selections) always scrolls to the top
when I delete an item from it using the takeItem method. If this is
happening because I'm doing something wrong, or if there is a simple
workaround for the problem, please let me know. Should I file a bug report
somewhere?

Thanks,

    Harold Mills


'''
This program demonstrates a problem I've encountered with the PySide
QListWidget class, using PySide 1.2.1, Qt 4.8.5, and Mac OS X 10.8.5.

To see the problem:

1. Run the program.
2. Scroll down the list.
3. Click on a list item to select it.
4. Press the "Delete" button.

When the item is deleted, the list scrolls to the top. I believe that it
should not scroll to the top.

The problem appears to have something to do with setting the selection
mode of the list to QAbstractItemView.ContiguousSelection. If one
instead sets the selection mode to QAbstractItemView.SingleSelection,
the problem does not occur.

Harold Mills
11 February 2014
'''


import sys

from PySide.QtGui import (
    QAbstractItemView, QApplication, QListWidget, QMainWindow,
    QPushButton, QVBoxLayout, QWidget)


class TestWindow(QMainWindow):


    def __init__(self):

        super(TestWindow, self).__init__()

        self.setWindowTitle('PySide QListWidget Problem')

        self._list = QListWidget(self)
        self._list.insertItems(0, [str(i + 1) for i in xrange(50)])

        # This line seems to be the problem. Change "Contiguous" to "Single"
        # and item deletion does not cause the list to scroll to the top.
        self._list.setSelectionMode(QAbstractItemView.ContiguousSelection)

        button = QPushButton('Delete', self)
        button.clicked.connect(self._on_button_clicked)

        box = QVBoxLayout()
        box.addWidget(self._list)
        box.addWidget(button)

        widget = QWidget()
        widget.setLayout(box)

        self.setCentralWidget(widget)


    def _on_button_clicked(self):
        l = self._list
        for item in l.selectedItems():
            l.takeItem(l.row(item))


def _main():

    app = QApplication(sys.argv)

    window = TestWindow()
    window.show()
    window.raise_()

    app.exec_()

    sys.exit()


if __name__ == '__main__':
    _main()
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