I have two classes, the MainWindow (default) and an extra class, that I called InteriorPaint. What im trying to do is to pass information from the MainWindow class to the Interior paint class. I'm using signals and slots to do that, but my problem is I can't find a place to put the connection.

1. Qt documentation: Multi window signal slot connection. A simple multiwindow example using signals and slots. There is a MainWindow class that controls the Main Window view.
2. The button click (signal) is connected to the action (slot). In this example, the method slotmethod will be called if the signal emits. This principle of connecting slots methods or function to a.
3. Qt signals and slots in different classes. Ask Question Asked 8 years, 5 months ago. Active 4 years, 7 months ago. Viewed 21k times 5. I have a class X with a slot, and a class Y with a signal. I'm setting up the connection from class X, and created a public method in class Y to emit the signal from class X (I'm not sure this step was.
4. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget) connect (sender, SIGNAL (valueChanged (QString, QString)), receiver, SLOT (updateValue (QString))); New: connecting to.

Graphical applications (GUI) are event-driven, unlike console or terminal applications. A users action like clicks a button or selecting an item in a list is called an event.

If an event takes place, each PyQt5 widget can emit a signal. A signal does not execute any action, that is done by a slot.

Related course:
Create GUI Apps with PyQt5

Qt Signal Slot Base Class

Signals and slot introduction
Consider this example:

The button click (signal) is connected to the action (slot). In this example, the method slot_method will be called if the signal emits.

This principle of connecting slots methods or function to a widget, applies to all widgets,

Qt Signal Slot Same Class

or we can explicitly define the signal:

PyQt supports many type of signals, not just clicks.

Qt Connect Signal Slot

Example
We can create a method (slot) that is connected to a widget. A slot is any callable function or method.

On running the application, we can click the button to execute the action (slot).

Qt Signal Slot Two Classes

If you are new to programming Python PyQt, I highly recommend this book.