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Diffstat (limited to 'doc/codesnippets/doc/src/snippets/code/src_corelib_kernel_qobject.cpp')
| -rw-r--r-- | doc/codesnippets/doc/src/snippets/code/src_corelib_kernel_qobject.cpp | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/doc/codesnippets/doc/src/snippets/code/src_corelib_kernel_qobject.cpp b/doc/codesnippets/doc/src/snippets/code/src_corelib_kernel_qobject.cpp new file mode 100644 index 000000000..81e7edc8a --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/code/src_corelib_kernel_qobject.cpp @@ -0,0 +1,319 @@ +//! [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] |