treenode_item_model.py

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# Author: Isaac Saito

from __future__ import division

from python_qt_binding.QtCore import Qt
from python_qt_binding.QtGui import QStandardItemModel
import rospy


class TreenodeItemModel(QStandardItemModel):
    """
    This class is made only for this purpose; to hold QStandardItem instances
    associated with QModelIndex. QStandardItemModel has methods to return it
    by index called itemFromIndex, but in some cases the method doesn't work
    for unknown reasons. Ref. question asked:
    http://stackoverflow.com/questions/14646979/strange-index-values-from-qstandarditemmodel

    :author: Isaac Saito
    """

    def __init__(self, parent=None):
        super(TreenodeItemModel, self).__init__(parent)
        self._parent = parent

        self._indexes = {}  # { str : QPersistentModelIndex }

    def get_index_from_grn(self, grn):
        """

        :type grn: str
        :rtype: QPersistentModelIndex. None if the corresponding item isn't
                found.
        """
        rospy.logdebug('get_index_from_grn all item={}'.format(
                                                               self._indexes))
        return self._indexes.get(grn)

    def set_item_from_index(self, grn, qpindex):
        """
        :type grn: str
        :type qpindex: QPersistentModelIndex
        """
        rospy.logdebug('set_item_from_index grn={} qpindex={}'.format(
                                                               grn, qpindex))
        self._indexes[grn] = qpindex