Pyqt Signals And Slots Tutorial
PyQt Signals and slots, transcending classes. Saltwater Unladen Swallow. Posts: 3 Threads: 2 Joined: Sep 2019 Reputation: 0 Likes received: 0 #1. PyQt uses two mechanisms for event handlers: high-level signal and slot mechanisms and low-level event handlers. We introduce the use of the low-level event handler, the processEvents function, whose function is to process time, simply to refresh the page.
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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 −
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.
Pyqt Signals And Slots Tutorial For Beginners
When b1 is clicked, the clicked() signal is connected to b1_clicked() function
When b2 is clicked, the clicked() signal is connected to b2_clicked() function
Example
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The above code produces the following output −