gistfile1.py

#! /usr/bin/env python
# -*- coding: utf-8 -*-

from PyQt5 import QtCore


class BaseModel(QtCore.QAbstractListModel):
    
    def __init__(self, parent=None):
        super(BaseModel, self).__init__(parent)
        self._data = []
        
    def roleNames(self):    
        return self._roles
    
    def rowCount(self, parent=QtCore.QModelIndex()):
        return self.size()
    
    def setAll(self, data):
        self.beginResetModel()
        self._data = data
        self.endResetModel()
        self.dataChanged.emit(self.index(0), self.index(self.size()-1), [])
        
    def data(self, index, role):
        if not index.isValid() or index.row() > len(self._data):
            return QtCore.QVariant()

        try:
            item = self._data[index.row()]
        except:
            return QtCore.QVariant()
        
        for r, name in self._roles.iteritems():
            if r == role:
                getattr(item, name, QtCore.QVariant())
        return QtCore.QVariant()        
    
    def size(self):
        return len(self._data)
    
    @QtCore.pyqtSlot(result=bool)
    def isEmpty(self):
        return len(self._data) == 0
    
    @QtCore.pyqtSlot(int, result="QVariant")
    def get(self, i):
        return self._data[i]