ZetCode PyQt4 tutorial widgets I
#!/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()
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