The meta object contains names of all signal and slot members, as well as pointers to these functions.
I have tested the classes with version.2.8.
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In Qt, signals and slots have taken over from these messy function pointers.A Small Example, a minimal C class declaration might read: class Foo public: Foo int value const return val; void setValue( int private: int val; ; A small Qt class might read: class Foo : public QObject Q_object public: Foo int value const return val;.However, as slots, they can be invoked by any component, regardless of its access level, via a signal-slot connection.Since display is part of the class's interface with the rest of the program, the slot is public.Since slots are normal member functions with just a little extra spice, they have access rights like everyone else.Q_object public: Counter m_value 0; int value const return m_value; public slots: void setValue(int value signals: void valueChanged(int newValue private: int m_value; ; The QObject -based version has the same internal state, and provides public methods to access the state, but in addition it has.In the following code snippet, we create two Counter objects and connect the first object's valueChanged signal to the second object's setValue slot using QObject:connect Counter a, b; QObject:connect( a, Counter:valueChanged, b, Counter:setValue tValue(12 / lue 12, lue 12 tValue(48 / lue 12, lue.ui version"4.0" widget class"QDialog" name"SpellCheckDialog" property name"geometry" rect x 600 /x y 326 /y width 701 /width /rect /property property name"windowTitle" string Spell Checker /string /property layout class"QGridLayout" name"gridLayout" item row"0" column"0" widget class"QLabel" name"label" property name"text" string unknown word: /string /property /widget /item item.Run the moc on class definitions that contains signals or slots.
signal overflow void qlcdnumber:overflow activate_signal( "overflow One function is generated for each signal, and at present it almost always is a single call to the internal Qt function activate_signal which finds the appropriate slot or slots and passes on the call.All classes that inherit from, qObject or one of its subclasses (e.g., QWidget ) can contain signals and slots.A word about arguments: Our experience shows that signals and slots are more reusable if they do not use special types.H" *spellChecker, QWidget *parent) : QDialog(parent ui(new Ui:SpellCheckDialog) ui- setupUi(this _spellChecker spellChecker; connect(ui- listWidget, ui- ledtReplaceWith, slot(setText(QString connect(ui- btnAddToDict, signal(clicked this, slot(addToDict connect(ui- btnReplaceOnce, signal(clicked this, slot(replaceOnce connect(ui- btnReplaceAll, signal(clicked this, slot(replaceAll connect(ui- btnIgnoreOnce, signal(clicked this, slot(ignoreOnce connect(ui- btnIgnoreAll, signal(clicked this, slot(ignoreAll connect(ui- btnCancel, signal(clicked.Position int cursorPos cursor.You can also check if an object inherits a specific class, for example: if ( widget- inherits QButton ) / yes, it is a push button, radio button etc.If you don't care about overflow, or you know that overflow cannot occur, you can ignore the overflow signal,.e.
It may work with a more recent version (current.2.12).