Move examples from submodule to pyside-setup

Move PySide2 examples that are owned by the Qt Company
to a new examples directory.

Done-with: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>
Task-number: PYSIDE-363
Change-Id: I14099764d9eef2bc35e067086121427955862e3a
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

4 files changed, 1517 insertions, 0 deletions

diff --git a/examples/corelib/threads/mandelbrot.py b/examples/corelib/threads/mandelbrot.py
new file mode 100755
index 000000000..53da3d48d
--- /dev/null
+++ b/examples/corelib/threads/mandelbrot.py
@@ -0,0 +1,349 @@
+#!/usr/bin/env python
+
+#############################################################################
+##
+## Copyright (C) 2013 Riverbank Computing Limited.
+## Copyright (C) 2016 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the PySide examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide2 port of the corelib/threads/mandelbrot example from Qt v5.x, originating from PyQt"""
+
+from PySide2.QtCore import (Signal, QMutex, QMutexLocker, QPoint, QSize, Qt,
+        QThread, QWaitCondition)
+from PySide2.QtGui import QColor, QImage, QPainter, QPixmap, qRgb
+from PySide2.QtWidgets import QApplication, QWidget
+
+
+DefaultCenterX = -0.647011
+DefaultCenterY = -0.0395159
+DefaultScale = 0.00403897
+
+ZoomInFactor = 0.8
+ZoomOutFactor = 1 / ZoomInFactor
+ScrollStep = 20
+
+
+class RenderThread(QThread):
+    ColormapSize = 512
+
+    renderedImage = Signal(QImage, float)
+
+    def __init__(self, parent=None):
+        super(RenderThread, self).__init__(parent)
+
+        self.mutex = QMutex()
+        self.condition = QWaitCondition()
+        self.centerX = 0.0
+        self.centerY = 0.0
+        self.scaleFactor = 0.0
+        self.resultSize = QSize()
+        self.colormap = []
+
+        self.restart = False
+        self.abort = False
+
+        for i in range(RenderThread.ColormapSize):
+            self.colormap.append(self.rgbFromWaveLength(380.0 + (i * 400.0 / RenderThread.ColormapSize)))
+
+    def stop(self):
+        self.mutex.lock()
+        self.abort = True
+        self.condition.wakeOne()
+        self.mutex.unlock()
+
+        self.wait(2000)
+
+    def render(self, centerX, centerY, scaleFactor, resultSize):
+        locker = QMutexLocker(self.mutex)
+
+        self.centerX = centerX
+        self.centerY = centerY
+        self.scaleFactor = scaleFactor
+        self.resultSize = resultSize
+
+        if not self.isRunning():
+            self.start(QThread.LowPriority)
+        else:
+            self.restart = True
+            self.condition.wakeOne()
+
+    def run(self):
+        while True:
+            self.mutex.lock()
+            resultSize = self.resultSize
+            scaleFactor = self.scaleFactor
+            centerX = self.centerX
+            centerY = self.centerY
+            self.mutex.unlock()
+
+            halfWidth = resultSize.width() // 2
+            halfHeight = resultSize.height() // 2
+            image = QImage(resultSize, QImage.Format_RGB32)
+
+            NumPasses = 8
+            curpass = 0
+
+            while curpass < NumPasses:
+                MaxIterations = (1 << (2 * curpass + 6)) + 32
+                Limit = 4
+                allBlack = True
+
+                for y in range(-halfHeight, halfHeight):
+                    if self.restart:
+                        break
+                    if self.abort:
+                        return
+
+                    ay = 1j * (centerY + (y * scaleFactor))
+
+                    for x in range(-halfWidth, halfWidth):
+                        c0 = centerX + (x * scaleFactor) + ay
+                        c = c0
+                        numIterations = 0
+
+                        while numIterations < MaxIterations:
+                            numIterations += 1
+                            c = c*c + c0
+                            if abs(c) >= Limit:
+                                break
+                            numIterations += 1
+                            c = c*c + c0
+                            if abs(c) >= Limit:
+                                break
+                            numIterations += 1
+                            c = c*c + c0
+                            if abs(c) >= Limit:
+                                break
+                            numIterations += 1
+                            c = c*c + c0
+                            if abs(c) >= Limit:
+                                break
+
+                        if numIterations < MaxIterations:
+                            image.setPixel(x + halfWidth, y + halfHeight,
+                                           self.colormap[numIterations % RenderThread.ColormapSize])
+                            allBlack = False
+                        else:
+                            image.setPixel(x + halfWidth, y + halfHeight, qRgb(0, 0, 0))
+
+                if allBlack and curpass == 0:
+                    curpass = 4
+                else:
+                    if not self.restart:
+                        self.renderedImage.emit(image, scaleFactor)
+                    curpass += 1
+
+            self.mutex.lock()
+            if not self.restart:
+                self.condition.wait(self.mutex)
+            self.restart = False
+            self.mutex.unlock()
+
+    def rgbFromWaveLength(self, wave):
+        r = 0.0
+        g = 0.0
+        b = 0.0
+
+        if wave >= 380.0 and wave <= 440.0:
+            r = -1.0 * (wave - 440.0) / (440.0 - 380.0)
+            b = 1.0
+        elif wave >= 440.0 and wave <= 490.0:
+            g = (wave - 440.0) / (490.0 - 440.0)
+            b = 1.0
+        elif wave >= 490.0 and wave <= 510.0:
+            g = 1.0
+            b = -1.0 * (wave - 510.0) / (510.0 - 490.0)
+        elif wave >= 510.0 and wave <= 580.0:
+            r = (wave - 510.0) / (580.0 - 510.0)
+            g = 1.0
+        elif wave >= 580.0 and wave <= 645.0:
+            r = 1.0
+            g = -1.0 * (wave - 645.0) / (645.0 - 580.0)
+        elif wave >= 645.0 and wave <= 780.0:
+            r = 1.0
+
+        s = 1.0
+        if wave > 700.0:
+            s = 0.3 + 0.7 * (780.0 - wave) / (780.0 - 700.0)
+        elif wave < 420.0:
+            s = 0.3 + 0.7 * (wave - 380.0) / (420.0 - 380.0)
+
+        r = pow(r * s, 0.8)
+        g = pow(g * s, 0.8)
+        b = pow(b * s, 0.8)
+
+        return qRgb(r*255, g*255, b*255)
+
+
+class MandelbrotWidget(QWidget):
+    def __init__(self, parent=None):
+        super(MandelbrotWidget, self).__init__(parent)
+
+        self.thread = RenderThread()
+        self.pixmap = QPixmap()
+        self.pixmapOffset = QPoint()
+        self.lastDragPos = QPoint()
+
+        self.centerX = DefaultCenterX
+        self.centerY = DefaultCenterY
+        self.pixmapScale = DefaultScale
+        self.curScale = DefaultScale
+
+        self.thread.renderedImage.connect(self.updatePixmap)
+
+        self.setWindowTitle("Mandelbrot")
+        self.setCursor(Qt.CrossCursor)
+        self.resize(550, 400)
+
+    def paintEvent(self, event):
+        painter = QPainter(self)
+        painter.fillRect(self.rect(), Qt.black)
+
+        if self.pixmap.isNull():
+            painter.setPen(Qt.white)
+            painter.drawText(self.rect(), Qt.AlignCenter,
+                    "Rendering initial image, please wait...")
+            return
+
+        if self.curScale == self.pixmapScale:
+            painter.drawPixmap(self.pixmapOffset, self.pixmap)
+        else:
+            scaleFactor = self.pixmapScale / self.curScale
+            newWidth = int(self.pixmap.width() * scaleFactor)
+            newHeight = int(self.pixmap.height() * scaleFactor)
+            newX = self.pixmapOffset.x() + (self.pixmap.width() - newWidth) / 2
+            newY = self.pixmapOffset.y() + (self.pixmap.height() - newHeight) / 2
+
+            painter.save()
+            painter.translate(newX, newY)
+            painter.scale(scaleFactor, scaleFactor)
+            exposed, _ = painter.matrix().inverted()
+            exposed = exposed.mapRect(self.rect()).adjusted(-1, -1, 1, 1)
+            painter.drawPixmap(exposed, self.pixmap, exposed)
+            painter.restore()
+
+        text = "Use mouse wheel or the '+' and '-' keys to zoom. Press and " \
+                "hold left mouse button to scroll."
+        metrics = painter.fontMetrics()
+        textWidth = metrics.width(text)
+
+        painter.setPen(Qt.NoPen)
+        painter.setBrush(QColor(0, 0, 0, 127))
+        painter.drawRect((self.width() - textWidth) / 2 - 5, 0, textWidth + 10,
+                metrics.lineSpacing() + 5)
+        painter.setPen(Qt.white)
+        painter.drawText((self.width() - textWidth) / 2,
+                metrics.leading() + metrics.ascent(), text)
+
+    def resizeEvent(self, event):
+        self.thread.render(self.centerX, self.centerY, self.curScale, self.size())
+
+    def keyPressEvent(self, event):
+        if event.key() == Qt.Key_Plus:
+            self.zoom(ZoomInFactor)
+        elif event.key() == Qt.Key_Minus:
+            self.zoom(ZoomOutFactor)
+        elif event.key() == Qt.Key_Left:
+            self.scroll(-ScrollStep, 0)
+        elif event.key() == Qt.Key_Right:
+            self.scroll(+ScrollStep, 0)
+        elif event.key() == Qt.Key_Down:
+            self.scroll(0, -ScrollStep)
+        elif event.key() == Qt.Key_Up:
+            self.scroll(0, +ScrollStep)
+        else:
+            super(MandelbrotWidget, self).keyPressEvent(event)
+
+    def wheelEvent(self, event):
+        numDegrees = event.angleDelta().y() / 8
+        numSteps = numDegrees / 15.0
+        self.zoom(pow(ZoomInFactor, numSteps))
+
+    def mousePressEvent(self, event):
+        if event.buttons() == Qt.LeftButton:
+            self.lastDragPos = QPoint(event.pos())
+
+    def mouseMoveEvent(self, event):
+        if event.buttons() & Qt.LeftButton:
+            self.pixmapOffset += event.pos() - self.lastDragPos
+            self.lastDragPos = QPoint(event.pos())
+            self.update()
+
+    def mouseReleaseEvent(self, event):
+        if event.button() == Qt.LeftButton:
+            self.pixmapOffset += event.pos() - self.lastDragPos
+            self.lastDragPos = QPoint()
+
+            deltaX = (self.width() - self.pixmap.width()) / 2 - self.pixmapOffset.x()
+            deltaY = (self.height() - self.pixmap.height()) / 2 - self.pixmapOffset.y()
+            self.scroll(deltaX, deltaY)
+
+    def updatePixmap(self, image, scaleFactor):
+        if not self.lastDragPos.isNull():
+            return
+
+        self.pixmap = QPixmap.fromImage(image)
+        self.pixmapOffset = QPoint()
+        self.lastDragPosition = QPoint()
+        self.pixmapScale = scaleFactor
+        self.update()
+
+    def zoom(self, zoomFactor):
+        self.curScale *= zoomFactor
+        self.update()
+        self.thread.render(self.centerX, self.centerY, self.curScale,
+                self.size())
+
+    def scroll(self, deltaX, deltaY):
+        self.centerX += deltaX * self.curScale
+        self.centerY += deltaY * self.curScale
+        self.update()
+        self.thread.render(self.centerX, self.centerY, self.curScale,
+                self.size())
+
+
+if __name__ == '__main__':
+
+    import sys
+
+    app = QApplication(sys.argv)
+    widget = MandelbrotWidget()
+    widget.show()
+    r = app.exec_()
+    widget.thread.stop()
+    sys.exit(r)
diff --git a/examples/corelib/tools/codecs/codecs.py b/examples/corelib/tools/codecs/codecs.py
new file mode 100755
index 000000000..15f7d9563
--- /dev/null
+++ b/examples/corelib/tools/codecs/codecs.py
@@ -0,0 +1,251 @@
+#!/usr/bin/env python
+
+#############################################################################
+##
+## Copyright (C) 2013 Riverbank Computing Limited.
+## Copyright (C) 2016 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the PySide examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide2 port of the widgets/tools/codecs example from Qt v5.x"""
+
+from PySide2 import QtCore, QtGui, QtWidgets
+
+
+def codec_name(codec):
+    try:
+        # Python v3.
+        name = str(codec.name(), encoding='ascii')
+    except TypeError:
+        # Python v2.
+        name = str(codec.name())
+
+    return name
+
+
+class MainWindow(QtWidgets.QMainWindow):
+    def __init__(self):
+        super(MainWindow, self).__init__()
+
+        self.textEdit = QtWidgets.QTextEdit()
+        self.textEdit.setLineWrapMode(QtWidgets.QTextEdit.NoWrap)
+        self.setCentralWidget(self.textEdit)
+
+        self.codecs = []
+        self.findCodecs()
+
+        self.previewForm = PreviewForm(self)
+        self.previewForm.setCodecList(self.codecs)
+
+        self.saveAsActs = []
+        self.createActions()
+        self.createMenus()
+
+        self.setWindowTitle("Codecs")
+        self.resize(500, 400)
+
+    def open(self):
+        fileName, _ = QtWidgets.QFileDialog.getOpenFileName(self)
+        if fileName:
+            inFile = QtCore.QFile(fileName)
+            if not inFile.open(QtCore.QFile.ReadOnly):
+                QtWidgets.QMessageBox.warning(self, "Codecs",
+                        "Cannot read file %s:\n%s" % (fileName, inFile.errorString()))
+                return
+
+            data = inFile.readAll()
+
+            self.previewForm.setEncodedData(data)
+            if self.previewForm.exec_():
+                self.textEdit.setPlainText(self.previewForm.decodedString())
+
+    def save(self):
+        fileName = QtWidgets.QFileDialog.getSaveFileName(self)
+        if fileName:
+            outFile = QtCore.QFile(fileName)
+            if not outFile.open(QtCore.QFile.WriteOnly|QtCore.QFile.Text):
+                QtWidgets.QMessageBox.warning(self, "Codecs",
+                        "Cannot write file %s:\n%s" % (fileName, outFile.errorString()))
+                return
+
+            action = self.sender()
+            codecName = action.data()
+
+            out = QtCore.QTextStream(outFile)
+            out.setCodec(codecName)
+            out << self.textEdit.toPlainText()
+
+    def about(self):
+        QtWidgets.QMessageBox.about(self, "About Codecs",
+                "The <b>Codecs</b> example demonstrates how to read and "
+                "write files using various encodings.")
+
+    def aboutToShowSaveAsMenu(self):
+        currentText = self.textEdit.toPlainText()
+
+        for action in self.saveAsActs:
+            codecName = str(action.data())
+            codec = QtCore.QTextCodec.codecForName(codecName)
+            action.setVisible(codec and codec.canEncode(currentText))
+
+    def findCodecs(self):
+        codecMap = []
+        iso8859RegExp = QtCore.QRegExp('ISO[- ]8859-([0-9]+).*')
+
+        for mib in QtCore.QTextCodec.availableMibs():
+            codec = QtCore.QTextCodec.codecForMib(mib)
+            sortKey = codec_name(codec).upper()
+            rank = 0
+
+            if sortKey.startswith('UTF-8'):
+                rank = 1
+            elif sortKey.startswith('UTF-16'):
+                rank = 2
+            elif iso8859RegExp.exactMatch(sortKey):
+                if len(iso8859RegExp.cap(1)) == 1:
+                    rank = 3
+                else:
+                    rank = 4
+            else:
+                rank = 5
+
+            codecMap.append((str(rank) + sortKey, codec))
+
+        codecMap.sort()
+        self.codecs = [item[-1] for item in codecMap]
+
+    def createActions(self):
+        self.openAct = QtWidgets.QAction("&Open...", self, shortcut="Ctrl+O",
+                triggered=self.open)
+
+        for codec in self.codecs:
+            name = codec_name(codec)
+
+            action = QtWidgets.QAction(name + '...', self, triggered=self.save)
+            action.setData(name)
+            self.saveAsActs.append(action)
+
+        self.exitAct = QtWidgets.QAction("E&xit", self, shortcut="Ctrl+Q",
+                triggered=self.close)
+
+        self.aboutAct = QtWidgets.QAction("&About", self, triggered=self.about)
+
+        self.aboutQtAct = QtWidgets.QAction("About &Qt", self,
+                triggered=QtWidgets.qApp.aboutQt)
+
+    def createMenus(self):
+        self.saveAsMenu = QtWidgets.QMenu("&Save As", self)
+        for action in self.saveAsActs:
+            self.saveAsMenu.addAction(action)
+
+        self.saveAsMenu.aboutToShow.connect(self.aboutToShowSaveAsMenu)
+
+        self.fileMenu = QtWidgets.QMenu("&File", self)
+        self.fileMenu.addAction(self.openAct)
+        self.fileMenu.addMenu(self.saveAsMenu)
+        self.fileMenu.addSeparator()
+        self.fileMenu.addAction(self.exitAct)
+
+        self.helpMenu = QtWidgets.QMenu("&Help", self)
+        self.helpMenu.addAction(self.aboutAct)
+        self.helpMenu.addAction(self.aboutQtAct)
+
+        self.menuBar().addMenu(self.fileMenu)
+        self.menuBar().addSeparator()
+        self.menuBar().addMenu(self.helpMenu)
+
+
+class PreviewForm(QtWidgets.QDialog):
+    def __init__(self, parent):
+        super(PreviewForm, self).__init__(parent)
+
+        self.encodingComboBox = QtWidgets.QComboBox()
+        encodingLabel = QtWidgets.QLabel("&Encoding:")
+        encodingLabel.setBuddy(self.encodingComboBox)
+
+        self.textEdit = QtWidgets.QTextEdit()
+        self.textEdit.setLineWrapMode(QtWidgets.QTextEdit.NoWrap)
+        self.textEdit.setReadOnly(True)
+
+        buttonBox = QtWidgets.QDialogButtonBox(QtWidgets.QDialogButtonBox.Ok | QtWidgets.QDialogButtonBox.Cancel)
+
+        self.encodingComboBox.activated.connect(self.updateTextEdit)
+        buttonBox.accepted.connect(self.accept)
+        buttonBox.rejected.connect(self.reject)
+
+        mainLayout = QtWidgets.QGridLayout()
+        mainLayout.addWidget(encodingLabel, 0, 0)
+        mainLayout.addWidget(self.encodingComboBox, 0, 1)
+        mainLayout.addWidget(self.textEdit, 1, 0, 1, 2)
+        mainLayout.addWidget(buttonBox, 2, 0, 1, 2)
+        self.setLayout(mainLayout)
+
+        self.setWindowTitle("Choose Encoding")
+        self.resize(400, 300)
+
+    def setCodecList(self, codecs):
+        self.encodingComboBox.clear()
+        for codec in codecs:
+            self.encodingComboBox.addItem(codec_name(codec), codec.mibEnum())
+
+    def setEncodedData(self, data):
+        self.encodedData = data
+        self.updateTextEdit()
+
+    def decodedString(self):
+        return self.decodedStr
+
+    def updateTextEdit(self):
+        mib = self.encodingComboBox.itemData(self.encodingComboBox.currentIndex())
+        codec = QtCore.QTextCodec.codecForMib(mib)
+
+        data = QtCore.QTextStream(self.encodedData)
+        data.setAutoDetectUnicode(False)
+        data.setCodec(codec)
+
+        self.decodedStr = data.readAll()
+        self.textEdit.setPlainText(self.decodedStr)
+
+
+if __name__ == '__main__':
+
+    import sys
+
+    app = QtWidgets.QApplication(sys.argv)
+    mainWin = MainWindow()
+    mainWin.show()
+    sys.exit(app.exec_())
diff --git a/examples/corelib/tools/regexp.py b/examples/corelib/tools/regexp.py
new file mode 100755
index 000000000..7e28a5365
--- /dev/null
+++ b/examples/corelib/tools/regexp.py
@@ -0,0 +1,195 @@
+#!/usr/bin/env python
+
+#############################################################################
+##
+## Copyright (C) 2013 Riverbank Computing Limited.
+## Copyright (C) 2016 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the PySide examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide2 port of the widgets/tools/regexp example from Qt v5.x"""
+
+from PySide2 import QtCore, QtGui, QtWidgets
+
+
+class RegExpDialog(QtWidgets.QDialog):
+    MaxCaptures = 6
+
+    def __init__(self, parent=None):
+        super(RegExpDialog, self).__init__(parent)
+
+        self.patternComboBox = QtWidgets.QComboBox()
+        self.patternComboBox.setEditable(True)
+        self.patternComboBox.setSizePolicy(QtWidgets.QSizePolicy.Expanding,
+                QtWidgets.QSizePolicy.Preferred)
+
+        patternLabel = QtWidgets.QLabel("&Pattern:")
+        patternLabel.setBuddy(self.patternComboBox)
+
+        self.escapedPatternLineEdit = QtWidgets.QLineEdit()
+        self.escapedPatternLineEdit.setReadOnly(True)
+        palette = self.escapedPatternLineEdit.palette()
+        palette.setBrush(QtGui.QPalette.Base,
+                palette.brush(QtGui.QPalette.Disabled, QtGui.QPalette.Base))
+        self.escapedPatternLineEdit.setPalette(palette)
+
+        escapedPatternLabel = QtWidgets.QLabel("&Escaped Pattern:")
+        escapedPatternLabel.setBuddy(self.escapedPatternLineEdit)
+
+        self.syntaxComboBox = QtWidgets.QComboBox()
+        self.syntaxComboBox.addItem("Regular expression v1",
+                QtCore.QRegExp.RegExp)
+        self.syntaxComboBox.addItem("Regular expression v2",
+                QtCore.QRegExp.RegExp2)
+        self.syntaxComboBox.addItem("Wildcard", QtCore.QRegExp.Wildcard)
+        self.syntaxComboBox.addItem("Fixed string",
+                QtCore.QRegExp.FixedString)
+
+        syntaxLabel = QtWidgets.QLabel("&Pattern Syntax:")
+        syntaxLabel.setBuddy(self.syntaxComboBox)
+
+        self.textComboBox = QtWidgets.QComboBox()
+        self.textComboBox.setEditable(True)
+        self.textComboBox.setSizePolicy(QtWidgets.QSizePolicy.Expanding,
+                QtWidgets.QSizePolicy.Preferred)
+
+        textLabel = QtWidgets.QLabel("&Text:")
+        textLabel.setBuddy(self.textComboBox)
+
+        self.caseSensitiveCheckBox = QtWidgets.QCheckBox("Case &Sensitive")
+        self.caseSensitiveCheckBox.setChecked(True)
+        self.minimalCheckBox = QtWidgets.QCheckBox("&Minimal")
+
+        indexLabel = QtWidgets.QLabel("Index of Match:")
+        self.indexEdit = QtWidgets.QLineEdit()
+        self.indexEdit.setReadOnly(True)
+
+        matchedLengthLabel = QtWidgets.QLabel("Matched Length:")
+        self.matchedLengthEdit = QtWidgets.QLineEdit()
+        self.matchedLengthEdit.setReadOnly(True)
+
+        self.captureLabels = []
+        self.captureEdits = []
+        for i in range(self.MaxCaptures):
+            self.captureLabels.append(QtWidgets.QLabel("Capture %d:" % i))
+            self.captureEdits.append(QtWidgets.QLineEdit())
+            self.captureEdits[i].setReadOnly(True)
+        self.captureLabels[0].setText("Match:")
+
+        checkBoxLayout = QtWidgets.QHBoxLayout()
+        checkBoxLayout.addWidget(self.caseSensitiveCheckBox)
+        checkBoxLayout.addWidget(self.minimalCheckBox)
+        checkBoxLayout.addStretch(1)
+
+        mainLayout = QtWidgets.QGridLayout()
+        mainLayout.addWidget(patternLabel, 0, 0)
+        mainLayout.addWidget(self.patternComboBox, 0, 1)
+        mainLayout.addWidget(escapedPatternLabel, 1, 0)
+        mainLayout.addWidget(self.escapedPatternLineEdit, 1, 1)
+        mainLayout.addWidget(syntaxLabel, 2, 0)
+        mainLayout.addWidget(self.syntaxComboBox, 2, 1)
+        mainLayout.addLayout(checkBoxLayout, 3, 0, 1, 2)
+        mainLayout.addWidget(textLabel, 4, 0)
+        mainLayout.addWidget(self.textComboBox, 4, 1)
+        mainLayout.addWidget(indexLabel, 5, 0)
+        mainLayout.addWidget(self.indexEdit, 5, 1)
+        mainLayout.addWidget(matchedLengthLabel, 6, 0)
+        mainLayout.addWidget(self.matchedLengthEdit, 6, 1)
+
+        for i in range(self.MaxCaptures):
+            mainLayout.addWidget(self.captureLabels[i], 7 + i, 0)
+            mainLayout.addWidget(self.captureEdits[i], 7 + i, 1)
+        self.setLayout(mainLayout)
+
+        self.patternComboBox.editTextChanged.connect(self.refresh)
+        self.textComboBox.editTextChanged.connect(self.refresh)
+        self.caseSensitiveCheckBox.toggled.connect(self.refresh)
+        self.minimalCheckBox.toggled.connect(self.refresh)
+        self.syntaxComboBox.currentIndexChanged.connect(self.refresh)
+
+        self.patternComboBox.addItem("[A-Za-z_]+([A-Za-z_0-9]*)")
+        self.textComboBox.addItem("(10 + delta4)* 32")
+
+        self.setWindowTitle("RegExp")
+        self.setFixedHeight(self.sizeHint().height())
+        self.refresh()
+
+    def refresh(self):
+        self.setUpdatesEnabled(False)
+
+        pattern = self.patternComboBox.currentText()
+        text = self.textComboBox.currentText()
+
+        escaped = str(pattern)
+        escaped.replace('\\', '\\\\')
+        escaped.replace('"', '\\"')
+        self.escapedPatternLineEdit.setText('"' + escaped + '"')
+
+        rx = QtCore.QRegExp(pattern)
+        cs = QtCore.Qt.CaseInsensitive
+        if self.caseSensitiveCheckBox.isChecked():
+            cs = QtCore.Qt.CaseSensitive
+        rx.setCaseSensitivity(cs)
+        rx.setMinimal(self.minimalCheckBox.isChecked())
+        syntax = self.syntaxComboBox.itemData(self.syntaxComboBox.currentIndex())
+        rx.setPatternSyntax(QtCore.QRegExp.PatternSyntax(syntax))
+
+        palette = self.patternComboBox.palette()
+        if rx.isValid():
+            palette.setColor(QtGui.QPalette.Text,
+                    self.textComboBox.palette().color(QtGui.QPalette.Text))
+        else:
+            palette.setColor(QtGui.QPalette.Text, QtCore.Qt.red)
+        self.patternComboBox.setPalette(palette)
+
+        self.indexEdit.setText(str(rx.indexIn(text)))
+        self.matchedLengthEdit.setText(str(rx.matchedLength()))
+
+        for i in range(self.MaxCaptures):
+            self.captureLabels[i].setEnabled(i <= rx.captureCount())
+            self.captureEdits[i].setEnabled(i <= rx.captureCount())
+            self.captureEdits[i].setText(rx.cap(i))
+
+        self.setUpdatesEnabled(True)
+
+if __name__ == '__main__':
+
+    import sys
+
+    app = QtWidgets.QApplication(sys.argv)
+    dialog = RegExpDialog()
+    sys.exit(dialog.exec_())
diff --git a/examples/corelib/tools/settingseditor/settingseditor.py b/examples/corelib/tools/settingseditor/settingseditor.py
new file mode 100755
index 000000000..905049746
--- /dev/null
+++ b/examples/corelib/tools/settingseditor/settingseditor.py
@@ -0,0 +1,722 @@
+#!/usr/bin/env python
+
+#############################################################################
+##
+## Copyright (C) 2013 Riverbank Computing Limited.
+## Copyright (C) 2016 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the PySide examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide2 port of the widgets/tools/settingseditor example from Qt v5.x"""
+
+import sys
+
+from PySide2 import QtCore, QtGui, QtWidgets
+
+
+class MainWindow(QtWidgets.QMainWindow):
+    def __init__(self, parent=None):
+        super(MainWindow, self).__init__(parent)
+
+        self.settingsTree = SettingsTree()
+        self.setCentralWidget(self.settingsTree)
+
+        self.locationDialog = None
+
+        self.createActions()
+        self.createMenus()
+
+        self.autoRefreshAct.setChecked(True)
+        self.fallbacksAct.setChecked(True)
+
+        self.setWindowTitle("Settings Editor")
+        self.resize(500, 600)
+
+    def openSettings(self):
+        if self.locationDialog is None:
+            self.locationDialog = LocationDialog(self)
+
+        if self.locationDialog.exec_():
+            settings = QtCore.QSettings(self.locationDialog.format(),
+                                        self.locationDialog.scope(),
+                                        self.locationDialog.organization(),
+                                        self.locationDialog.application())
+            self.setSettingsObject(settings)
+            self.fallbacksAct.setEnabled(True)
+
+    def openIniFile(self):
+        fileName, _  = QtWidgets.QFileDialog.getOpenFileName(self, "Open INI File",
+                '', "INI Files (*.ini *.conf)")
+
+        if fileName:
+            settings = QtCore.QSettings(fileName, QtCore.QSettings.IniFormat)
+            self.setSettingsObject(settings)
+            self.fallbacksAct.setEnabled(False)
+
+    def openPropertyList(self):
+        fileName, _ = QtWidgets.QFileDialog.getOpenFileName(self,
+                "Open Property List", '', "Property List Files (*.plist)")
+
+        if fileName:
+            settings = QtCore.QSettings(fileName, QtCore.QSettings.NativeFormat)
+            self.setSettingsObject(settings)
+            self.fallbacksAct.setEnabled(False)
+
+    def openRegistryPath(self):
+        path, ok = QtWidgets.QInputDialog.getText(self, "Open Registry Path",
+                "Enter the path in the Windows registry:",
+                QtWidgets.QLineEdit.Normal, 'HKEY_CURRENT_USER\\')
+
+        if ok and path != '':
+            settings = QtCore.QSettings(path, QtCore.QSettings.NativeFormat)
+            self.setSettingsObject(settings)
+            self.fallbacksAct.setEnabled(False)
+
+    def about(self):
+        QtWidgets.QMessageBox.about(self, "About Settings Editor",
+                "The <b>Settings Editor</b> example shows how to access "
+                "application settings using Qt.")
+
+    def createActions(self):
+        self.openSettingsAct = QtWidgets.QAction("&Open Application Settings...",
+                self, shortcut="Ctrl+O", triggered=self.openSettings)
+
+        self.openIniFileAct = QtWidgets.QAction("Open I&NI File...", self,
+                shortcut="Ctrl+N", triggered=self.openIniFile)
+
+        self.openPropertyListAct = QtWidgets.QAction("Open macOS &Property List...",
+                self, shortcut="Ctrl+P", triggered=self.openPropertyList)
+        if sys.platform != 'darwin':
+            self.openPropertyListAct.setEnabled(False)
+
+        self.openRegistryPathAct = QtWidgets.QAction(
+                "Open Windows &Registry Path...", self, shortcut="Ctrl+G",
+                triggered=self.openRegistryPath)
+        if sys.platform != 'win32':
+            self.openRegistryPathAct.setEnabled(False)
+
+        self.refreshAct = QtWidgets.QAction("&Refresh", self, shortcut="Ctrl+R",
+                enabled=False, triggered=self.settingsTree.refresh)
+
+        self.exitAct = QtWidgets.QAction("E&xit", self, shortcut="Ctrl+Q",
+                triggered=self.close)
+
+        self.autoRefreshAct = QtWidgets.QAction("&Auto-Refresh", self,
+                shortcut="Ctrl+A", checkable=True, enabled=False)
+        self.autoRefreshAct.triggered[bool].connect(self.settingsTree.setAutoRefresh)
+        self.autoRefreshAct.triggered[bool].connect(self.refreshAct.setDisabled)
+
+        self.fallbacksAct = QtWidgets.QAction("&Fallbacks", self,
+                shortcut="Ctrl+F", checkable=True, enabled=False)
+        self.fallbacksAct.triggered[bool].connect(self.settingsTree.setFallbacksEnabled)
+
+        self.aboutAct = QtWidgets.QAction("&About", self, triggered=self.about)
+
+        self.aboutQtAct = QtWidgets.QAction("About &Qt", self,
+                triggered=QtWidgets.qApp.aboutQt)
+
+    def createMenus(self):
+        self.fileMenu = self.menuBar().addMenu("&File")
+        self.fileMenu.addAction(self.openSettingsAct)
+        self.fileMenu.addAction(self.openIniFileAct)
+        self.fileMenu.addAction(self.openPropertyListAct)
+        self.fileMenu.addAction(self.openRegistryPathAct)
+        self.fileMenu.addSeparator()
+        self.fileMenu.addAction(self.refreshAct)
+        self.fileMenu.addSeparator()
+        self.fileMenu.addAction(self.exitAct)
+
+        self.optionsMenu = self.menuBar().addMenu("&Options")
+        self.optionsMenu.addAction(self.autoRefreshAct)
+        self.optionsMenu.addAction(self.fallbacksAct)
+
+        self.menuBar().addSeparator()
+
+        self.helpMenu = self.menuBar().addMenu("&Help")
+        self.helpMenu.addAction(self.aboutAct)
+        self.helpMenu.addAction(self.aboutQtAct)
+
+    def setSettingsObject(self, settings):
+        settings.setFallbacksEnabled(self.fallbacksAct.isChecked())
+        self.settingsTree.setSettingsObject(settings)
+
+        self.refreshAct.setEnabled(True)
+        self.autoRefreshAct.setEnabled(True)
+
+        niceName = settings.fileName()
+        niceName.replace('\\', '/')
+        niceName = niceName.split('/')[-1]
+
+        if not settings.isWritable():
+            niceName += " (read only)"
+
+        self.setWindowTitle("%s - Settings Editor" % niceName)
+
+
+class LocationDialog(QtWidgets.QDialog):
+    def __init__(self, parent=None):
+        super(LocationDialog, self).__init__(parent)
+
+        self.formatComboBox = QtWidgets.QComboBox()
+        self.formatComboBox.addItem("Native")
+        self.formatComboBox.addItem("INI")
+
+        self.scopeComboBox = QtWidgets.QComboBox()
+        self.scopeComboBox.addItem("User")
+        self.scopeComboBox.addItem("System")
+
+        self.organizationComboBox = QtWidgets.QComboBox()
+        self.organizationComboBox.addItem("Trolltech")
+        self.organizationComboBox.setEditable(True)
+
+        self.applicationComboBox = QtWidgets.QComboBox()
+        self.applicationComboBox.addItem("Any")
+        self.applicationComboBox.addItem("Application Example")
+        self.applicationComboBox.addItem("Assistant")
+        self.applicationComboBox.addItem("Designer")
+        self.applicationComboBox.addItem("Linguist")
+        self.applicationComboBox.setEditable(True)
+        self.applicationComboBox.setCurrentIndex(3)
+
+        formatLabel = QtWidgets.QLabel("&Format:")
+        formatLabel.setBuddy(self.formatComboBox)
+
+        scopeLabel = QtWidgets.QLabel("&Scope:")
+        scopeLabel.setBuddy(self.scopeComboBox)
+
+        organizationLabel = QtWidgets.QLabel("&Organization:")
+        organizationLabel.setBuddy(self.organizationComboBox)
+
+        applicationLabel = QtWidgets.QLabel("&Application:")
+        applicationLabel.setBuddy(self.applicationComboBox)
+
+        self.locationsGroupBox = QtWidgets.QGroupBox("Setting Locations")
+
+        self.locationsTable = QtWidgets.QTableWidget()
+        self.locationsTable.setSelectionMode(QtWidgets.QAbstractItemView.SingleSelection)
+        self.locationsTable.setSelectionBehavior(QtWidgets.QAbstractItemView.SelectRows)
+        self.locationsTable.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers)
+        self.locationsTable.setColumnCount(2)
+        self.locationsTable.setHorizontalHeaderLabels(("Location", "Access"))
+        self.locationsTable.horizontalHeader().setSectionResizeMode(0, QtWidgets.QHeaderView.Stretch)
+        self.locationsTable.horizontalHeader().resizeSection(1, 180)
+
+        self.buttonBox = QtWidgets.QDialogButtonBox(QtWidgets.QDialogButtonBox.Ok | QtWidgets.QDialogButtonBox.Cancel)
+
+        self.formatComboBox.activated.connect(self.updateLocationsTable)
+        self.scopeComboBox.activated.connect(self.updateLocationsTable)
+        self.organizationComboBox.lineEdit().editingFinished.connect(self.updateLocationsTable)
+        self.applicationComboBox.lineEdit().editingFinished.connect(self.updateLocationsTable)
+        self.buttonBox.accepted.connect(self.accept)
+        self.buttonBox.rejected.connect(self.reject)
+
+        locationsLayout = QtWidgets.QVBoxLayout()
+        locationsLayout.addWidget(self.locationsTable)
+        self.locationsGroupBox.setLayout(locationsLayout)
+
+        mainLayout = QtWidgets.QGridLayout()
+        mainLayout.addWidget(formatLabel, 0, 0)
+        mainLayout.addWidget(self.formatComboBox, 0, 1)
+        mainLayout.addWidget(scopeLabel, 1, 0)
+        mainLayout.addWidget(self.scopeComboBox, 1, 1)
+        mainLayout.addWidget(organizationLabel, 2, 0)
+        mainLayout.addWidget(self.organizationComboBox, 2, 1)
+        mainLayout.addWidget(applicationLabel, 3, 0)
+        mainLayout.addWidget(self.applicationComboBox, 3, 1)
+        mainLayout.addWidget(self.locationsGroupBox, 4, 0, 1, 2)
+        mainLayout.addWidget(self.buttonBox, 5, 0, 1, 2)
+        self.setLayout(mainLayout)
+
+        self.updateLocationsTable()
+
+        self.setWindowTitle("Open Application Settings")
+        self.resize(650, 400)
+
+    def format(self):
+        if self.formatComboBox.currentIndex() == 0:
+            return QtCore.QSettings.NativeFormat
+        else:
+            return QtCore.QSettings.IniFormat
+
+    def scope(self):
+        if self.scopeComboBox.currentIndex() == 0:
+            return QtCore.QSettings.UserScope
+        else:
+            return QtCore.QSettings.SystemScope
+
+    def organization(self):
+        return self.organizationComboBox.currentText()
+
+    def application(self):
+        if self.applicationComboBox.currentText() == "Any":
+            return ''
+
+        return self.applicationComboBox.currentText()
+
+    def updateLocationsTable(self):
+        self.locationsTable.setUpdatesEnabled(False)
+        self.locationsTable.setRowCount(0)
+
+        for i in range(2):
+            if i == 0:
+                if self.scope() == QtCore.QSettings.SystemScope:
+                    continue
+
+                actualScope = QtCore.QSettings.UserScope
+            else:
+                actualScope = QtCore.QSettings.SystemScope
+
+            for j in range(2):
+                if j == 0:
+                    if not self.application():
+                        continue
+
+                    actualApplication = self.application()
+                else:
+                    actualApplication = ''
+
+                settings = QtCore.QSettings(self.format(), actualScope,
+                        self.organization(), actualApplication)
+
+                row = self.locationsTable.rowCount()
+                self.locationsTable.setRowCount(row + 1)
+
+                item0 = QtWidgets.QTableWidgetItem()
+                item0.setText(settings.fileName())
+
+                item1 = QtWidgets.QTableWidgetItem()
+                disable = not (settings.childKeys() or settings.childGroups())
+
+                if row == 0:
+                    if settings.isWritable():
+                        item1.setText("Read-write")
+                        disable = False
+                    else:
+                        item1.setText("Read-only")
+                    self.buttonBox.button(QtWidgets.QDialogButtonBox.Ok).setDisabled(disable)
+                else:
+                    item1.setText("Read-only fallback")
+
+                if disable:
+                    item0.setFlags(item0.flags() & ~QtCore.Qt.ItemIsEnabled)
+                    item1.setFlags(item1.flags() & ~QtCore.Qt.ItemIsEnabled)
+
+                self.locationsTable.setItem(row, 0, item0)
+                self.locationsTable.setItem(row, 1, item1)
+
+        self.locationsTable.setUpdatesEnabled(True)
+
+
+class SettingsTree(QtWidgets.QTreeWidget):
+    def __init__(self, parent=None):
+        super(SettingsTree, self).__init__(parent)
+
+        self.setItemDelegate(VariantDelegate(self))
+
+        self.setHeaderLabels(("Setting", "Type", "Value"))
+        self.header().setSectionResizeMode(0, QtWidgets.QHeaderView.Stretch)
+        self.header().setSectionResizeMode(2, QtWidgets.QHeaderView.Stretch)
+
+        self.settings = None
+        self.refreshTimer = QtCore.QTimer()
+        self.refreshTimer.setInterval(2000)
+        self.autoRefresh = False
+
+        self.groupIcon = QtGui.QIcon()
+        self.groupIcon.addPixmap(self.style().standardPixmap(QtWidgets.QStyle.SP_DirClosedIcon),
+                QtGui.QIcon.Normal, QtGui.QIcon.Off)
+        self.groupIcon.addPixmap(self.style().standardPixmap(QtWidgets.QStyle.SP_DirOpenIcon),
+                QtGui.QIcon.Normal, QtGui.QIcon.On)
+        self.keyIcon = QtGui.QIcon()
+        self.keyIcon.addPixmap(self.style().standardPixmap(QtWidgets.QStyle.SP_FileIcon))
+
+        self.refreshTimer.timeout.connect(self.maybeRefresh)
+
+    def setSettingsObject(self, settings):
+        self.settings = settings
+        self.clear()
+
+        if self.settings is not None:
+            self.settings.setParent(self)
+            self.refresh()
+            if self.autoRefresh:
+                self.refreshTimer.start()
+        else:
+            self.refreshTimer.stop()
+
+    def sizeHint(self):
+        return QtCore.QSize(800, 600)
+
+    def setAutoRefresh(self, autoRefresh):
+        self.autoRefresh = autoRefresh
+
+        if self.settings is not None:
+            if self.autoRefresh:
+                self.maybeRefresh()
+                self.refreshTimer.start()
+            else:
+                self.refreshTimer.stop()
+
+    def setFallbacksEnabled(self, enabled):
+        if self.settings is not None:
+            self.settings.setFallbacksEnabled(enabled)
+            self.refresh()
+
+    def maybeRefresh(self):
+        if self.state() != QtWidgets.QAbstractItemView.EditingState:
+            self.refresh()
+
+    def refresh(self):
+        if self.settings is None:
+            return
+
+        # The signal might not be connected.
+        try:
+            self.itemChanged.disconnect(self.updateSetting)
+        except:
+            pass
+
+        self.settings.sync()
+        self.updateChildItems(None)
+
+        self.itemChanged.connect(self.updateSetting)
+
+    def event(self, event):
+        if event.type() == QtCore.QEvent.WindowActivate:
+            if self.isActiveWindow() and self.autoRefresh:
+                self.maybeRefresh()
+
+        return super(SettingsTree, self).event(event)
+
+    def updateSetting(self, item):
+        key = item.text(0)
+        ancestor = item.parent()
+
+        while ancestor:
+            key = ancestor.text(0) + '/' + key
+            ancestor = ancestor.parent()
+
+        d = item.data(2, QtCore.Qt.UserRole)
+        self.settings.setValue(key, item.data(2, QtCore.Qt.UserRole))
+
+        if self.autoRefresh:
+            self.refresh()
+
+    def updateChildItems(self, parent):
+        dividerIndex = 0
+
+        for group in self.settings.childGroups():
+            childIndex = self.findChild(parent, group, dividerIndex)
+            if childIndex != -1:
+                child = self.childAt(parent, childIndex)
+                child.setText(1, '')
+                child.setText(2, '')
+                child.setData(2, QtCore.Qt.UserRole, None)
+                self.moveItemForward(parent, childIndex, dividerIndex)
+            else:
+                child = self.createItem(group, parent, dividerIndex)
+
+            child.setIcon(0, self.groupIcon)
+            dividerIndex += 1
+
+            self.settings.beginGroup(group)
+            self.updateChildItems(child)
+            self.settings.endGroup()
+
+        for key in self.settings.childKeys():
+            childIndex = self.findChild(parent, key, 0)
+            if childIndex == -1 or childIndex >= dividerIndex:
+                if childIndex != -1:
+                    child = self.childAt(parent, childIndex)
+                    for i in range(child.childCount()):
+                        self.deleteItem(child, i)
+                    self.moveItemForward(parent, childIndex, dividerIndex)
+                else:
+                    child = self.createItem(key, parent, dividerIndex)
+                child.setIcon(0, self.keyIcon)
+                dividerIndex += 1
+            else:
+                child = self.childAt(parent, childIndex)
+
+            value = self.settings.value(key)
+            if value is None:
+                child.setText(1, 'Invalid')
+            else:
+                child.setText(1, value.__class__.__name__)
+            child.setText(2, VariantDelegate.displayText(value))
+            child.setData(2, QtCore.Qt.UserRole, value)
+
+        while dividerIndex < self.childCount(parent):
+            self.deleteItem(parent, dividerIndex)
+
+    def createItem(self, text, parent, index):
+        after = None
+
+        if index != 0:
+            after = self.childAt(parent, index - 1)
+
+        if parent is not None:
+            item = QtWidgets.QTreeWidgetItem(parent, after)
+        else:
+            item = QtWidgets.QTreeWidgetItem(self, after)
+
+        item.setText(0, text)
+        item.setFlags(item.flags() | QtCore.Qt.ItemIsEditable)
+        return item
+
+    def deleteItem(self, parent, index):
+        if parent is not None:
+            item = parent.takeChild(index)
+        else:
+            item = self.takeTopLevelItem(index)
+        del item
+
+    def childAt(self, parent, index):
+        if parent is not None:
+            return parent.child(index)
+        else:
+            return self.topLevelItem(index)
+
+    def childCount(self, parent):
+        if parent is not None:
+            return parent.childCount()
+        else:
+            return self.topLevelItemCount()
+
+    def findChild(self, parent, text, startIndex):
+        for i in range(self.childCount(parent)):
+            if self.childAt(parent, i).text(0) == text:
+                return i
+        return -1
+
+    def moveItemForward(self, parent, oldIndex, newIndex):
+        for int in range(oldIndex - newIndex):
+            self.deleteItem(parent, newIndex)
+
+
+class VariantDelegate(QtWidgets.QItemDelegate):
+    def __init__(self, parent=None):
+        super(VariantDelegate, self).__init__(parent)
+
+        self.boolExp = QtCore.QRegExp()
+        self.boolExp.setPattern('true|false')
+        self.boolExp.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
+
+        self.byteArrayExp = QtCore.QRegExp()
+        self.byteArrayExp.setPattern('[\\x00-\\xff]*')
+
+        self.charExp = QtCore.QRegExp()
+        self.charExp.setPattern('.')
+
+        self.colorExp = QtCore.QRegExp()
+        self.colorExp.setPattern('\\(([0-9]*),([0-9]*),([0-9]*),([0-9]*)\\)')
+
+        self.doubleExp = QtCore.QRegExp()
+        self.doubleExp.setPattern('')
+
+        self.pointExp = QtCore.QRegExp()
+        self.pointExp.setPattern('\\((-?[0-9]*),(-?[0-9]*)\\)')
+
+        self.rectExp = QtCore.QRegExp()
+        self.rectExp.setPattern('\\((-?[0-9]*),(-?[0-9]*),(-?[0-9]*),(-?[0-9]*)\\)')
+
+        self.signedIntegerExp = QtCore.QRegExp()
+        self.signedIntegerExp.setPattern('-?[0-9]*')
+
+        self.sizeExp = QtCore.QRegExp(self.pointExp)
+
+        self.unsignedIntegerExp = QtCore.QRegExp()
+        self.unsignedIntegerExp.setPattern('[0-9]*')
+
+        self.dateExp = QtCore.QRegExp()
+        self.dateExp.setPattern('([0-9]{,4})-([0-9]{,2})-([0-9]{,2})')
+
+        self.timeExp = QtCore.QRegExp()
+        self.timeExp.setPattern('([0-9]{,2}):([0-9]{,2}):([0-9]{,2})')
+
+        self.dateTimeExp = QtCore.QRegExp()
+        self.dateTimeExp.setPattern(self.dateExp.pattern() + 'T' + self.timeExp.pattern())
+
+    def paint(self, painter, option, index):
+        if index.column() == 2:
+            value = index.model().data(index, QtCore.Qt.UserRole)
+            if not self.isSupportedType(value):
+                myOption = QtWidgets.QStyleOptionViewItem(option)
+                myOption.state &= ~QtWidgets.QStyle.State_Enabled
+                super(VariantDelegate, self).paint(painter, myOption, index)
+                return
+
+        super(VariantDelegate, self).paint(painter, option, index)
+
+    def createEditor(self, parent, option, index):
+        if index.column() != 2:
+            return None
+
+        originalValue = index.model().data(index, QtCore.Qt.UserRole)
+        if not self.isSupportedType(originalValue):
+            return None
+
+        lineEdit = QtWidgets.QLineEdit(parent)
+        lineEdit.setFrame(False)
+
+        if isinstance(originalValue, bool):
+            regExp = self.boolExp
+        elif isinstance(originalValue, float):
+            regExp = self.doubleExp
+        elif isinstance(originalValue, int):
+            regExp = self.signedIntegerExp
+        elif isinstance(originalValue, QtCore.QByteArray):
+            regExp = self.byteArrayExp
+        elif isinstance(originalValue, QtGui.QColor):
+            regExp = self.colorExp
+        elif isinstance(originalValue, QtCore.QDate):
+            regExp = self.dateExp
+        elif isinstance(originalValue, QtCore.QDateTime):
+            regExp = self.dateTimeExp
+        elif isinstance(originalValue, QtCore.QTime):
+            regExp = self.timeExp
+        elif isinstance(originalValue, QtCore.QPoint):
+            regExp = self.pointExp
+        elif isinstance(originalValue, QtCore.QRect):
+            regExp = self.rectExp
+        elif isinstance(originalValue, QtCore.QSize):
+            regExp = self.sizeExp
+        else:
+            regExp = QtCore.QRegExp()
+
+        if not regExp.isEmpty():
+            validator = QtGui.QRegExpValidator(regExp, lineEdit)
+            lineEdit.setValidator(validator)
+
+        return lineEdit
+
+    def setEditorData(self, editor, index):
+        value = index.model().data(index, QtCore.Qt.UserRole)
+        if editor is not None:
+            editor.setText(self.displayText(value))
+
+    def setModelData(self, editor, model, index):
+        if not editor.isModified():
+            return
+
+        text = editor.text()
+        validator = editor.validator()
+        if validator is not None:
+            state, text, _ = validator.validate(text, 0)
+            if state != QtGui.QValidator.Acceptable:
+                return
+
+        originalValue = index.model().data(index, QtCore.Qt.UserRole)
+
+        if isinstance(originalValue, QtGui.QColor):
+            self.colorExp.exactMatch(text)
+            value = QtGui.QColor(min(int(self.colorExp.cap(1)), 255),
+                                 min(int(self.colorExp.cap(2)), 255),
+                                 min(int(self.colorExp.cap(3)), 255),
+                                 min(int(self.colorExp.cap(4)), 255))
+        elif isinstance(originalValue, QtCore.QDate):
+            value = QtCore.QDate.fromString(text, QtCore.Qt.ISODate)
+            if not value.isValid():
+                return
+        elif isinstance(originalValue, QtCore.QDateTime):
+            value = QtCore.QDateTime.fromString(text, QtCore.Qt.ISODate)
+            if not value.isValid():
+                return
+        elif isinstance(originalValue, QtCore.QTime):
+            value = QtCore.QTime.fromString(text, QtCore.Qt.ISODate)
+            if not value.isValid():
+                return
+        elif isinstance(originalValue, QtCore.QPoint):
+            self.pointExp.exactMatch(text)
+            value = QtCore.QPoint(int(self.pointExp.cap(1)),
+                                  int(self.pointExp.cap(2)))
+        elif isinstance(originalValue, QtCore.QRect):
+            self.rectExp.exactMatch(text)
+            value = QtCore.QRect(int(self.rectExp.cap(1)),
+                                 int(self.rectExp.cap(2)),
+                                 int(self.rectExp.cap(3)),
+                                 int(self.rectExp.cap(4)))
+        elif isinstance(originalValue, QtCore.QSize):
+            self.sizeExp.exactMatch(text)
+            value = QtCore.QSize(int(self.sizeExp.cap(1)),
+                                 int(self.sizeExp.cap(2)))
+        elif isinstance(originalValue, list):
+            value = text.split(',')
+        else:
+            value = type(originalValue)(text)
+
+        model.setData(index, self.displayText(value), QtCore.Qt.DisplayRole)
+        model.setData(index, value, QtCore.Qt.UserRole)
+
+    @staticmethod
+    def isSupportedType(value):
+        return isinstance(value, (bool, float, int, QtCore.QByteArray,
+                str, QtGui.QColor, QtCore.QDate, QtCore.QDateTime,
+                QtCore.QTime, QtCore.QPoint, QtCore.QRect, QtCore.QSize,
+                list))
+
+    @staticmethod
+    def displayText(value):
+        if isinstance(value, (bool, int, QtCore.QByteArray)):
+            return str(value)
+        if isinstance(value, str):
+            return value
+        elif isinstance(value, float):
+            return '%g' % value
+        elif isinstance(value, QtGui.QColor):
+            return '(%u,%u,%u,%u)' % (value.red(), value.green(), value.blue(), value.alpha())
+        elif isinstance(value, (QtCore.QDate, QtCore.QDateTime, QtCore.QTime)):
+            return value.toString(QtCore.Qt.ISODate)
+        elif isinstance(value, QtCore.QPoint):
+            return '(%d,%d)' % (value.x(), value.y())
+        elif isinstance(value, QtCore.QRect):
+            return '(%d,%d,%d,%d)' % (value.x(), value.y(), value.width(), value.height())
+        elif isinstance(value, QtCore.QSize):
+            return '(%d,%d)' % (value.width(), value.height())
+        elif isinstance(value, list):
+            return ','.join(value)
+        elif value is None:
+            return '<Invalid>'
+
+        return '<%s>' % value
+
+
+if __name__ == '__main__':
+    app = QtWidgets.QApplication(sys.argv)
+    mainWin = MainWindow()
+    mainWin.show()
+    sys.exit(app.exec_())