**pyqt_example_learn<style>

from PyQt4 import QtCore, QtGui
class WidgetGallery(QtGui.QDialog):
    def __init__(self,parent=None):
        super(WidgetGallery,self).__init__(parent)

        self.palette = QtGui.QApplication.palette()

        
        combo_box = QtGui.QComboBox()
        combo_box.addItems(QtGui.QStyleFactory.keys())

        label = QtGui.QLabel('style')
        label.setBuddy(combo_box)

        check_box_one = QtGui.QCheckBox('use')
        check_box_one.setChecked(True)
        
        check_box_two = QtGui.QCheckBox('disable')

        self.createTopLeftGroupBox()
        self.createTopRightGroupBox()
        self.createBottomLeftTabWidget()
        self.createBottomRightGroupBox()
        self.createProgressBar()

        combo_box.activated[str].connect(self.changeStyle)
        check_box_one.toggled.connect(self.changePalette)
        check_box_two.toggled.connect(self.topLeftGroupBox.setDisabled)
        check_box_two.toggled.connect(self.topRightGroupBox.setDisabled)
        check_box_two.toggled.connect(self.bottomLeftTabWidget.setDisabled)
        check_box_two.toggled.connect(self.bottomRightGroupBox.setDisabled)

        layout_x = QtGui.QHBoxLayout()
        layout_x.addWidget(label)
        layout_x.addWidget(combo_box)
        layout_x.addStretch(1)
        layout_x.addWidget(check_box_one)
        layout_x.addWidget(check_box_two)

        mainLayout = QtGui.QGridLayout()
        mainLayout.addLayout(layout_x, 0, 0, 1, 2)
        mainLayout.addWidget(self.topLeftGroupBox, 1, 0)
        mainLayout.addWidget(self.topRightGroupBox, 1, 1)
        mainLayout.addWidget(self.bottomLeftTabWidget, 2, 0)
        mainLayout.addWidget(self.bottomRightGroupBox, 2, 1)
        mainLayout.addWidget(self.progress_bar, 3, 0, 1, 2)
        mainLayout.setRowStretch(1, 1)
        mainLayout.setRowStretch(2, 1)
        mainLayout.setColumnStretch(0, 1)
        mainLayout.setColumnStretch(1, 1)
        
        self.setLayout(mainLayout)
        self.setWindowTitle('style')
        #self.resize(100,100)

    def changeStyle(self,styleName):
        QtGui.QApplication.setStyle(QtGui.QStyleFactory.create(styleName))
        self.changePalette()
        
    def changePalette(self):
        if (check_box_one.isChecked()):
            QtGui.QApplication.setPalette(QtGui.QApplication.style().standardPalette())
        else:
            QtGui.QApplication.setPalette(self.originalPalette)
            
    def advanceProgressBar(self):
        curval = self.progress_bar.value()
        maxval = self.progress_bar.maximum()
        self.progress_bar.setValue(curval+(maxval-curval)/100)
            
        
        
    def createTopLeftGroupBox(self):
        self.topLeftGroupBox = QtGui.QGroupBox('group_one')

        button1 = QtGui.QRadioButton('radio_button_a')
        button2 = QtGui.QRadioButton('radio_button_a')
        button3 = QtGui.QRadioButton('radio_button_a')
        button1.setChecked(True)

        layout = QtGui.QVBoxLayout()
        layout.addWidget(button1)
        layout.addWidget(button2)
        layout.addWidget(button3)

        self.topLeftGroupBox.setLayout(layout)
        
    def createTopRightGroupBox(self):
        self.topRightGroupBox = QtGui.QGroupBox('group_two')
    def createBottomLeftTabWidget(self):
        self.bottomLeftTabWidget = QtGui.QTabWidget()
        tab1 = QtGui.QWidget()
        table1 = QtGui.QTableWidget(5,5)

        tab1_layout = QtGui.QHBoxLayout()
        tab1_layout.setMargin(5)
        tab1_layout.addWidget(table1)
        tab1.setLayout(tab1_layout)

        tab2 = QtGui.QWidget()
        table2 = QtGui.QTextEdit()
        table2.setPlainText('hello world')

        tab2_layout = QtGui.QHBoxLayout()
        tab2_layout.setMargin(5)
        tab2_layout.addWidget(table2)
        tab2.setLayout(tab2_layout)

        self.bottomLeftTabWidget.addTab(tab1,'table widget')
        self.bottomLeftTabWidget.addTab(tab2,'text widget')

        
    def createBottomRightGroupBox(self):
        self.bottomRightGroupBox = QtGui.QGroupBox('group_three')
    def createProgressBar(self):
        self.progress_bar = QtGui.QProgressBar()
        self.progress_bar.setRange(0,10000)
        self.progress_bar.setValue(0)

        timer = QtCore.QTimer(self)
        timer.timeout.connect(self.advanceProgressBar)
        timer.start(1000)
        
if __name__ == '__main__':

    import sys

    app = QtGui.QApplication(sys.argv)
    gallery = WidgetGallery()
    gallery.show()
    sys.exit(app.exec_())