PyQt 4.3 QTableView / QAbstractTableModel sorting example

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http://www.saltycrane.com/blog/2007/12/pyqt-43-qtableview-qabstracttablemodel/

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It took me a while to figure out why QTableView's setSortingEnabled method wasn't working. It turns out the sort method in QAbstractItemModel is not implemented. So I had to implement it myself. Hence, my previous post, How to sort a table by columns in Python. I'm not sure if this is the best way to implement the sort method, but I couldn't find anything else out there, and this seems to work for me.

import re
import operator
import os
import sys 
from PyQt4.QtCore import * 
from PyQt4.QtGui import * 
 
def main(): 
    app = QApplication(sys.argv) 
    w = MyWindow() 
    w.show() 
    sys.exit(app.exec_()) 
 
class MyWindow(QWidget): 
    def __init__(self, *args): 
        QWidget.__init__(self, *args) 

        # create table
        self.get_table_data()
        table = self.createTable() 
         
        # layout
        layout = QVBoxLayout()
        layout.addWidget(table) 
        self.setLayout(layout) 

    def get_table_data(self):
        stdouterr = os.popen4("dir c:\\")[1].read()
        lines = stdouterr.splitlines()
        lines = lines[5:]
        lines = lines[:-2]
        self.tabledata = [re.split(r"\s+", line, 4)
                     for line in lines]

    def createTable(self):
        # create the view
        tv = QTableView()

        # set the table model
        header = ['date', 'time', '', 'size', 'filename']
        tm = MyTableModel(self.tabledata, header, self) 
        tv.setModel(tm)

        # set the minimum size
        tv.setMinimumSize(400, 300)

        # hide grid
        tv.setShowGrid(False)

        # set the font
        font = QFont("Courier New", 8)
        tv.setFont(font)

        # hide vertical header
        vh = tv.verticalHeader()
        vh.setVisible(False)

        # set horizontal header properties
        hh = tv.horizontalHeader()
        hh.setStretchLastSection(True)

        # set column width to fit contents
        tv.resizeColumnsToContents()

        # set row height
        nrows = len(self.tabledata)
        for row in xrange(nrows):
            tv.setRowHeight(row, 18)

        # enable sorting
        tv.setSortingEnabled(True)

        return tv
 
class MyTableModel(QAbstractTableModel): 
    def __init__(self, datain, headerdata, parent=None, *args): 
        """ datain: a list of lists
            headerdata: a list of strings
        """
        QAbstractTableModel.__init__(self, parent, *args) 
        self.arraydata = datain
        self.headerdata = headerdata
 
    def rowCount(self, parent): 
        return len(self.arraydata) 
 
    def columnCount(self, parent): 
        return len(self.arraydata[0]) 
 
    def data(self, index, role): 
        if not index.isValid(): 
            return QVariant() 
        elif role != Qt.DisplayRole: 
            return QVariant() 
        return QVariant(self.arraydata[index.row()][index.column()]) 

    def headerData(self, col, orientation, role):
        if orientation == Qt.Horizontal and role == Qt.DisplayRole:
            return QVariant(self.headerdata[col])
        return QVariant()

    def sort(self, Ncol, order):
        """Sort table by given column number.
        """
        self.emit(SIGNAL("layoutAboutToBeChanged()"))
        self.arraydata = sorted(self.arraydata, key=operator.itemgetter(Ncol))        
        if order == Qt.DescendingOrder:
            self.arraydata.reverse()
        self.emit(SIGNAL("layoutChanged()"))

if __name__ == "__main__": 
    main()