#!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, a QtGui.QCheckBox widget is used to toggle the title of a window. author: Jan Bodnar website: zetcode.com last edited: September 2011 """ import sys from PyQt4 import QtGui, QtCore class Example(QtGui.QWidget): def __init__(self): super(Example, self).__init__() self.initUI() def initUI(self): # This is a QtGui.QCheckBox constructor. cb = QtGui.QCheckBox('Show title', self) cb.move(20, 20) # We have set the window title, so we must also check the checkbox. By default, the window title is not set and the checkbox is unchecked. cb.toggle() # We connect the user defined changeTitle() method to the stateChanged signal. The changeTitle() method will toggle the window title. cb.stateChanged.connect(self.changeTitle) self.setGeometry(300, 300, 250, 150) self.setWindowTitle('QtGui.QCheckBox') self.show() # The state of the widget is given to the changeTitle() method in the state variable. If the widget is checked, we set a title of the window. Otherwise, we set an empty string to the titlebar. def changeTitle(self, state): if state == QtCore.Qt.Checked: self.setWindowTitle('QtGui.QCheckBox') else: self.setWindowTitle('') def main(): app = QtGui.QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() -------------------------------------------------------------------------------- #!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial In this example, we create three toggle buttons. They will control the background color of a QtGui.QFrame. author: Jan Bodnar website: zetcode.com last edited: September 2011 """ import sys from PyQt4 import QtGui class Example(QtGui.QWidget): def __init__(self): super(Example, self).__init__() self.initUI() def initUI(self): # This is the initial, black colour value. self.col = QtGui.QColor(0, 0, 0) # To create a toggle button, we create a QtGui.QPushButton and make it checkable by calling the setCheckable() method. redb = QtGui.QPushButton('Red', self) redb.setCheckable(True) redb.move(10, 10) # We connect a clicked signal to our user defined method. We use the clicked signal that operates with a Boolean value. redb.clicked[bool].connect(self.setColor) greenb = QtGui.QPushButton('Green', self) greenb.setCheckable(True) greenb.move(10, 60) greenb.clicked[bool].connect(self.setColor) blueb = QtGui.QPushButton('Blue', self) blueb.setCheckable(True) blueb.move(10, 110) blueb.clicked[bool].connect(self.setColor) self.square = QtGui.QFrame(self) self.square.setGeometry(150, 20, 100, 100) self.square.setStyleSheet("QWidget { background-color: %s }" % self.col.name()) self.setGeometry(300, 300, 280, 170) self.setWindowTitle('Toggle button') self.show() def setColor(self, pressed): # We get the button which was toggled. source = self.sender() if pressed: val = 255 else: val = 0 # In case it is a red button, we update the red part of the colour accordingly. if source.text() == "Red": self.col.setRed(val) elif source.text() == "Green": self.col.setGreen(val) else: self.col.setBlue(val) # We use style sheets to change the background colour. self.square.setStyleSheet("QFrame { background-color: %s }" % self.col.name()) def main(): app = QtGui.QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() -------------------------------------------------------------------------------- #!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial This example shows a QtGui.QSlider widget. author: Jan Bodnar website: zetcode.com last edited: September 2011 """ import sys from PyQt4 import QtGui, QtCore class Example(QtGui.QWidget): def __init__(self): super(Example, self).__init__() self.initUI() def initUI(self): # Here we create a horizontal QtGui.QSlider. sld = QtGui.QSlider(QtCore.Qt.Horizontal, self) sld.setFocusPolicy(QtCore.Qt.NoFocus) sld.setGeometry(30, 40, 100, 30) # We connect the valueChanged signal to the user defined changeValue() method. sld.valueChanged[int].connect(self.changeValue) self.label = QtGui.QLabel(self) # We create a QtGui.QLabel widget and set an initial mute image to it. self.label.setPixmap(QtGui.QPixmap('mute.png')) self.label.setGeometry(160, 40, 80, 30) self.setGeometry(300, 300, 280, 170) self.setWindowTitle('QtGui.QSlider') self.show() def changeValue(self, value): # Based on the value of the slider, we set an image to the label. In the above code, we set a mute.png image to the label if the slider is equal to zero if value == 0: self.label.setPixmap(QtGui.QPixmap('mute.png')) elif value > 0 and value <= 30: self.label.setPixmap(QtGui.QPixmap('min.png')) elif value > 30 and value < 80: self.label.setPixmap(QtGui.QPixmap('med.png')) else: self.label.setPixmap(QtGui.QPixmap('max.png')) def main(): app = QtGui.QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() -------------------------------------------------------------------------------- #!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial This example shows a QtGui.QProgressBar widget. author: Jan Bodnar website: zetcode.com last edited: September 2011 """ import sys from PyQt4 import QtGui, QtCore class Example(QtGui.QWidget): def __init__(self): super(Example, self).__init__() self.initUI() def initUI(self): # This is a QtGui.QProgressBar constructor. self.pbar = QtGui.QProgressBar(self) self.pbar.setGeometry(30, 40, 200, 25) self.btn = QtGui.QPushButton('Start', self) self.btn.move(40, 80) self.btn.clicked.connect(self.doAction) # To activate the progress bar, we use a timer object. self.timer = QtCore.QBasicTimer() self.step = 0 self.setGeometry(300, 300, 280, 170) self.setWindowTitle('QtGui.QProgressBar') self.show() # Each QtCore.QObject and its descendants have a timerEvent() event handler. In order to react to timer events, we reimplement the event handler. def timerEvent(self, e): if self.step >= 100: self.timer.stop() self.btn.setText('Finished') return self.step = self.step + 1 self.pbar.setValue(self.step) # Inside the doAction() method, we start and stop the timer. def doAction(self): if self.timer.isActive(): self.timer.stop() self.btn.setText('Start') else: # To launch a timer event, we call its start() method. This method has two parameters: the timeout and the object which will receive the events. self.timer.start(100, self) self.btn.setText('Stop') def main(): app = QtGui.QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main() -------------------------------------------------------------------------------- #!/usr/bin/python # -*- coding: utf-8 -*- """ ZetCode PyQt4 tutorial This example shows a QtGui.QCalendarWidget widget. author: Jan Bodnar website: zetcode.com last edited: September 2011 """ import sys from PyQt4 import QtGui, QtCore class Example(QtGui.QWidget): def __init__(self): super(Example, self).__init__() self.initUI() def initUI(self): # We construct a calendar widget. cal = QtGui.QCalendarWidget(self) cal.setGridVisible(True) cal.move(20, 20) # If we select a date from the widget, a clicked[QtCore.QDate] signal is emitted. We connect this signal to the user defined showDate() method. cal.clicked[QtCore.QDate].connect(self.showDate) self.lbl = QtGui.QLabel(self) date = cal.selectedDate() self.lbl.setText(date.toString()) self.lbl.move(130, 260) self.setGeometry(300, 300, 350, 300) self.setWindowTitle('Calendar') self.show() # We retrieve the selected date by calling the selectedDate() method. Then we transform the date object into string and set it to the label widget. def showDate(self, date): self.lbl.setText(date.toString()) def main(): app = QtGui.QApplication(sys.argv) ex = Example() sys.exit(app.exec_()) if __name__ == '__main__': main()
