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//! [0]
lineEdit = qt_find_obj_child(myWidget, "QLineEdit", "my line edit")
if lineEdit:
lineEdit.setText("Default")
//! [0]
//! [1]
obj = QPushButton()
obj.metaObject().className() # returns "QPushButton"
QPushButton.staticMetaObject.className() # returns "QPushButton"
//! [1]
//! [2]
QPushButton.staticMetaObject.className() # returns "QPushButton"
obj = QPushButton()
obj.metaObject().className() # returns "QPushButton"
//! [2]
//! [3]
obj = QTimer() # QTimer inherits QObject
timer = obj
# timer == (QObject *)obj
button = obj
# button == 0
//! [3]
//! [4]
timer = QTimer() # QTimer inherits QObject
timer.inherits("QTimer") # returns true
timer.inherits("QObject") # returns true
timer.inherits("QAbstractButton") # returns false
# QLayout inherits QObject and QLayoutItem
layout = QLayout()
layout.inherits("QObject") # returns true
layout.inherits("QLayoutItem") # returns false
//! [4]
//! [5]
print "MyClass::setPrecision(): (%s) invalid precision %f" % \
(qPrintable(objectName()), newPrecision)
//! [5]
//! [6]
class MainWindow(QMainWindow):
def __init__(self):
self.textEdit = QTextEdit()
setCentralWidget(self.textEdit)
textEdit.installEventFilter(self)
def eventFilter(self, obj, event):
if obj == textEdit:
if event.type() == QEvent.KeyPress:
keyEvent = event
print "Ate key press", keyEvent.key()
return true
else:
return false
else:
# pass the event on to the parent class
return QMainWindow.eventFilter(self, obj, event)
//! [6]
//! [7]
myObject.moveToThread(QApplication.instance().thread())
//! [7]
//! [8]
class MyObject(QObject):
def __init__(self, parent):
QObject.__init__(self, parent)
self.startTimer(50) # 50-millisecond timer
self.startTimer(1000) # 1-second timer
self.startTimer(60000) # 1-minute timer
def timerEvent(self, event):
print "Timer ID:", event.timerId()
//! [8]
//! [9]
list = window().queryList("QAbstractButton")
for obj in list:
obj.setEnabled(false)
//! [9]
//! [10]
button = parentWidget.findChild(QPushButton, "button1")
//! [10]
//! [11]
list = parentWidget.findChild(QListWidget)
//! [11]
//! [12]
widgets = parentWidget.findChildren(QWidget, "widgetname")
//! [12]
//! [13]
allPButtons = parentWidget.findChildren(QPushButton)
//! [13]
//! [14]
monitoredObj.installEventFilter(filterObj)
//! [14]
//! [15]
class KeyPressEater(QObject):
def eventFilter(self, obj, event):
if event.type() == QEvent.KeyPress:
print "Ate key press", event.key()
return True
else:
# standard event processing
return QObject.eventFilter(self, obj, event)
//! [15]
//! [16]
keyPressEater = KeyPressEater(self)
pushButton = QPushButton(self)
listView = QListView(self)
pushButton.installEventFilter(keyPressEater)
listView.installEventFilter(keyPressEater)
//! [16]
//! [17]
def __init__(self):
senderLabel = QLabel(self.tr("Name:"))
recipientLabel = QLabel(self.tr("Name:", "recipient"))
# ...
//! [17]
//! [18]
n = messages.count();
showMessage(self.tr("%n message(s) saved", "", n));
//! [18]
//! [19]
if n == 1:
self.tr("%n message saved")
else:
self.tr("%n messages saved")
//! [19]
//! [20]
label.setText(self.tr("F\374r \310lise"))
//! [20]
//! [21]
if receivers(SIGNAL('valueChanged()')) > 0:
data = get_the_value() # expensive operation
self.valueChanged(data)
//! [21]
//! [22]
label = QLabel()
scrollBar = QScrollBar()
QObject.connect(scrollBar, SIGNAL('valueChanged()'),
label, SLOT('setNum()'))
//! [22]
//! [23]
// WRONG
QObject.connect(scrollBar, SIGNAL('valueChanged()'),
label, SLOT('setNum()'));
//! [23]
//! [24]
class MyWidget(QWidget):
def __init__(self):
myButton = QPushButton(self)
connect(myButton, SIGNAL('clicked()'),
self, SIGNAL('buttonClicked()'))
//! [24]
//! [25]
QObject.connect: Cannot queue arguments of type 'MyType'
(Make sure 'MyType' is registered using qRegisterMetaType().)
//! [25]
//! [26]
disconnect(myObject, 0, 0, 0)
//! [26]
//! [27]
myObject.disconnect()
//! [27]
//! [28]
disconnect(myObject, SIGNAL('mySignal()'), 0, 0)
//! [28]
//! [29]
myObject.disconnect(SIGNAL('mySignal()'))
//! [29]
//! [30]
disconnect(myObject, 0, myReceiver, 0)
//! [30]
//! [31]
myObject.disconnect(myReceiver)
//! [31]
//! [32]
if QLatin1String(signal) == SIGNAL('valueChanged()'):
# signal is valueChanged()
//! [32]
//! [33]
def on_<object name>_<signal name>(<signal parameters>)
//! [33]
//! [34]
def on_button1_clicked()
//! [34]
//! [35]
class MyClass(QObject):
Q_CLASSINFO("Author", "Pierre Gendron")
Q_CLASSINFO("URL", "http://www.my-organization.qc.ca")
//! [35]
//! [36]
Q_PROPERTY(type name
READ getFunction
[WRITE setFunction]
[RESET resetFunction]
[DESIGNABLE bool]
[SCRIPTABLE bool]
[STORED bool]
[USER bool])
//! [36]
//! [37]
Q_PROPERTY(QString title READ title WRITE setTitle USER true)
//! [37]
//! [38]
#this not apply for Python
class MyClass(QObject):
Q_OBJECT
Q_ENUMS(Priority)
public:
MyClass(QObject *parent = 0);
~MyClass();
enum Priority { High, Low, VeryHigh, VeryLow };
void setPriority(Priority priority);
Priority priority() const;
};
//! [38]
//! [39]
#this not apply for Python
Q_FLAGS(Options Alignment)
//! [39]
//! [40]
//: This name refers to a host name.
hostNameLabel.setText(self.tr("Name:"))
#: This text refers to a C++ code example.
example = self.tr("Example")
//! [40]
//! [explicit tr context]
text = QScrollBar.tr("Page up")
//! [explicit tr context]
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