#!/usr/bin/env python

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import sys

from PyQt4.QtCore import SIGNAL

from PyQt4.QtGui import QApplication, QColor, QIcon, QLabel, QMdiArea, QPixmap, \

                        QPushButton, QTableWidget, QTableWidgetItem, QTextEdit

class Changer:

    def __init__(self, mdiArea):

        self.mdiArea = mdiArea

        self.state = 0

    def change(self):

        if self.state == 0:

            self.mdiArea.cascadeSubWindows()

            self.mdiArea.setWindowTitle("Cascade")

        elif self.state == 1:

            self.mdiArea.tileSubWindows()

            self.mdiArea.setWindowTitle("Tile")

        self.state = (self.state + 1) % 2

if __name__ == "__main__":

    app = QApplication(sys.argv)

    pixmap = QPixmap(16, 16)

    pixmap.fill(QColor(0, 0, 0, 0))

    icon = QIcon(pixmap)

    app.setWindowIcon(icon)

    mdiArea = QMdiArea()

    textEdit = QTextEdit()

    textEdit.setPlainText("Qt Quarterly is a paper-based newsletter "

                          "exclusively available to Qt customers. Every "

                          "quarter we mail out an issue that we hope will "

                          "bring added insight and pleasure to your Qt "

                          "programming, with high-quality technical articles "

                          "written by Qt experts.")

    textWindow = mdiArea.addSubWindow(textEdit)

    textWindow.setWindowTitle("A Text Editor")

    label = QLabel()

    label.setPixmap(QPixmap("../../images/qt-logo.png"))

    labelWindow = mdiArea.addSubWindow(label)

    labelWindow.setWindowTitle("A Label")

    items = (("Henry", 23), ("Bill", 56), ("Susan", 19), ("Jane", 47))

    table = QTableWidget(len(items), 2)

    for i in range(len(items)):

        name, age = items[i]

        item = QTableWidgetItem(name)

        table.setItem(i, 0, item)

        item = QTableWidgetItem(str(age))

        table.setItem(i, 1, item)

    tableWindow = mdiArea.addSubWindow(table)

    tableWindow.setWindowTitle("A Table Widget")

    mdiArea.show()

    changer = Changer(mdiArea)

    button = QPushButton("Cascade")

    button.connect(button, SIGNAL("clicked()"), changer.change)

    button.show()

    sys.exit(app.exec_())