- PyQt Tutorial
- PyQt Useful Resources
Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal. Qt’s signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal’s parameters at the right time. Signals and slots can take any number of arguments of any type. Qt 시그널/슬롯 시스템은 객체(QObject)간 통신을 위해 사용되는데 Qt프레임워크에서 매우 중요한 부분이다. 시그널/슬롯을 이용하기 위해서는 두가지 요소를 만족 시켜줘야 한다. 첫번째는 QObject를 상속 받아야 하며, 두번째는 상속 받은 클래스에 QOBJECT 매크로를 명시 하고 있어야 한다.
Qt Signal Slot
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Unlike a console mode application, which is executed in a sequential manner, a GUI based application is event driven. Functions or methods are executed in response to user’s actions like clicking on a button, selecting an item from a collection or a mouse click etc., called events.
Widgets used to build the GUI interface act as the source of such events. Each PyQt widget, which is derived from QObject class, is designed to emit ‘signal’ in response to one or more events. The signal on its own does not perform any action. Instead, it is ‘connected’ to a ‘slot’. The slot can be any callable Python function.
In PyQt, connection between a signal and a slot can be achieved in different ways. Following are most commonly used techniques −
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A more convenient way to call a slot_function, when a signal is emitted by a widget is as follows −
Suppose if a function is to be called when a button is clicked. Here, the clicked signal is to be connected to a callable function. It can be achieved in any of the following two techniques −
or
Example
In the following example, two QPushButton objects (b1 and b2) are added in QDialog window. We want to call functions b1_clicked() and b2_clicked() on clicking b1 and b2 respectively.
When b1 is clicked, the clicked() signal is connected to b1_clicked() function
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When b2 is clicked, the clicked() signal is connected to b2_clicked() function
Example
The above code produces the following output −