"Qt Designer supports exactly this through a feature called widget promotion. In this tutorial, you'll learn how to take any custom Python widget and integrate it into your Qt Designer .ui files, so you can position and size it visually just like any built-in widget."
"The bad news is that since Qt Designer is a C++ application, it can't run your Python code. That means you won't see your custom widget rendered in the Designer preview. Instead, you'll see a placeholder (the base widget type you promoted from). Once you load the .ui file in your running Python application, your custom widget appears in all its glory."
"Widget promotion is Qt Designer's way of letting you swap a standard widget for a custom one. You start by placing a regular widget on your form, a plain QWidget for example, and then tell Qt Designer: "When this UI is actually used, replace this placeholder with my custom widget class instead.""
"Behind the scenes, this adds some extra information to the .ui file. When you load that file in Python using uic.loadUi() or compile it with pyuic6, the loader knows to import your custom class and use it in place of the base widget."
Qt Designer can integrate custom widgets into .ui layouts using widget promotion. A standard placeholder widget is placed on the form, such as a plain QWidget, and then configured so that when the UI is used, the placeholder is replaced by a custom widget class. Qt Designer stores extra metadata in the .ui file to record the promoted class. Because Qt Designer is a C++ application, it cannot execute Python code, so the Designer preview shows the base widget type rather than the custom rendering. When the .ui file is loaded in a Python application with uic.loadUi() or compiled with pyuic6, the loader imports the custom class and instantiates it, producing the intended widget appearance.
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