need serious help setting up images height width in QTableView

[krystosan]

I have made a QTableView that displays images from disk, there are two seriously agonizing problem I am facing.

First of after the windows shows up making it maximize or changing size of window is very slow,
and secondly I want to display images height width dependong on what can fit in the full window size of the maximized window keeping the aspect size of the thumbnails. Right now Images dont fit properly and text is getting displayed on left while i want it to display at bottom of the image.

import sys
import os

from PyQt4 import QtGui, QtCore

class MyListModel(QtCore.QAbstractTableModel): 
    def __init__(self, datain, col ,parent=None, *args): 
        """ datain: a list where each item is a row
        """
        QtCore.QAbstractListModel.__init__(self, parent, *args) 
        self._listdata = datain
        self._col = col


    def colData(self, section, orientation, role):
        if role == QtCore.Qt.DisplayRole:
            if orientation == QtCore.Qt.Horizontal:
                return QtCore.QString("Images")
            else:
                return QtCore.QString(os.path.splitext(self._listdata[section])[-1][1:].upper())

    def rowCount(self, parent=QtCore.QModelIndex()): 
        return len(self._listdata) 

    def columnCount(self, parent):
        return self._col

    def data(self, index, role):

        if role == QtCore.Qt.EditRole:
            row = index.row()
            column = index.column()
            fileName = os.path.split(self._listdata[row][column])[-1]
            return fileName

        if role == QtCore.Qt.ToolTipRole:
            row = index.row()
            column = index.column()
            fileName = os.path.split(self._listdata[row][column])[-1]
            return QtCore.QString(fileName)

        if index.isValid() and role == QtCore.Qt.DecorationRole:
            row = index.row()
            column = index.column()
            value = self._listdata[row][column]
            pixmap = QtGui.QPixmap()
            # pixmap.scaled(400,300, QtCore.Qt.KeepAspectRatio)
            pixmap.load(value)
            return QtGui.QImage(pixmap).scaled(120,100)

        if index.isValid() and role == QtCore.Qt.DisplayRole:
            row = index.row()
            column = index.column()
            value = self._listdata[row][column]
            fileName = os.path.split(value)[-1]
            return os.path.splitext(fileName)[0]

    def flags(self, index):
        return QtCore.Qt.ItemIsEditable | QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable

    def setData(self, index, value, role=QtCore.Qt.EditRole):
        if role == QtCore.Qt.EditRole:
            row = index.row()
            column = index.column()
            newName = os.path.join(str(os.path.split(self._listdata[row][column])[0]), str(value.toString()))
            self.__renameFile(self._listdata[row][column], newName)
            self._listdata[row][column] = newName
            self.dataChanged.emit(index, index)
            return True
        return False

    def __renameFile(self, fileToRename, newName):
        try:
            os.rename(str(fileToRename), newName)
        except Exception, err:
            print err


class MyTableView(QtGui.QTableView):
    """docstring for MyTableView"""
    def __init__(self):
        super(MyTableView, self).__init__()

        sw = QtGui.QDesktopWidget().screenGeometry(self).width()
        sh = QtGui.QDesktopWidget().screenGeometry(self).height()
        self.resize(sw, sh)

        thumbWidth = 100
        thumbheight = 120

        col = sw/thumbWidth
        self.setColumnWidth(thumbWidth, thumbheight)
        crntDir = "/Users/krystoSan/Pictures"
        # create table
        list_data = []
        philes = os.listdir(crntDir)
        for phile in philes:
            if phile.endswith(".png") or phile.endswith("jpg"):
                list_data.append(os.path.join(crntDir, phile))
        _twoDLst = convertToTwoDList(list_data, col)
        lm = MyListModel(_twoDLst, col, self)
        self.setModel(lm)
        self.show()

def convertToTwoDList(l, n):
    return [l[i:i+n] for i in range(0, len(l), n)]

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window =  MyTableView()
    window.show()
    window.raise_()
    sys.exit(app.exec_())

resizing the window or changing column width or height slow and sluggish...