another-widget | Watch events , weather and much more at a glance | Widget library

Basically, I want to add some QSliders to a window in QtDesigner, then "replace" them with a class that contains both a slider, and below it, a text box (a line edit).

EDIT: Why I want to do this: when I use QtDesigner, I can place sliders, and have an approximate visualization of the layout, as it is going to be in the final application:

That is why I want to use QtDesigner to begin with - to get an approximate visualization of the final layout, as it is going to be in the application. And since I want to replace these sliders with some sort of a widget that is based on a slider, it is much more helpful for me to have the sliders, first and foremost, in the view.

However, if I have to place QWidget as a starting point for replacement where the sliders are, then the QtDesigner view looks like this:

In other words, that space which previously showed a slider, is now empty - and so now I do not have a preview of the final GUI layout anymore, which sort of defeats the purpose of using QtDesigner for me (I might as well go the hard way, and try to draw the GUI entirely in code, without any visual feedback, with all the time consumption that might entail).

So far, I managed to get to this - I implemented a subclass of QSlider called "VertSlider" in test2.py, then promoted the QSliders in QtDesigner to this class in test2.ui:

Interestingly enough, it works somewhat - if you try looking hard at the center of the two sliders to the right, you can see the outline of the line edit in the center of the sliders.

But I don't want that, obviously - I'd want to have the line edit on bottom, it should take up as much vertical space from the original slider look (as specified in QtDesigner) as needed, and then the actual slider should fill up the rest of the vertical space (as indicated on the left of the screenshot).

I guess, part of the problem is, that QSlider does not seem to have a .layout() - that one by default returns "None"; I tried to force one, but that clearly does not work.

Via Qt widget stacking child layouts on top of each other found this quote from documentation:

If there already is a layout manager installed on this widget, QWidget won't let you install another. You must first delete the existing layout manager (returned by layout()) before you can call setLayout() with the new layout.

So apparently, QSlider does not have a default layout manager .... And judging by Is it possible to add text on top of a scrollbar? and Qt add a widget inside another widget? - it seems in that case, I'd have to either "Subclass ... and override paintEvent()" or "Use a proxy style/drawComplexControl()"; by the terminology in https://www.learnpyqt.com/courses/custom-widgets/creating-your-own-custom-widgets/ that would be a "custom-drawn widget", but I was really hoping that I could "just" do a "compound" widget: just somehow go from a QSlider-based specification in QtDesigner -> to a QSLider+QLineEdit widget, without having to deal with custom painting.

Of course, I can in principle subclass QWidget, and then the approach with layout.addWidget would work - but I cannot use that subclass to "promote" what is placed as a QSlider in QtDesigner.

So, what would be the easiest way to create a QSlider subclass, which would just add a line edit textbox on the bottom of the slider, which can be used as a class to promote QSlider to in QtDesigner?

test2.ui

A qDockWidget containing a qCustomPlot always starts with zero height. I am able to catch the qDockWidget resize event and change the qCustomPlot geometry using these answers, but the qCustomPlot is always hidden until it is manually stretched. Should this happen automatically, or do I need to calculate and set the dock height at startup?

This sample code creates a new qCustomPlot widget, places it in a layout, places that layout in another widget, and sets it to the dock. I have also tried placing the qCustomPlot widget directly into the dock. qCustomPlot setGeometry, setMinimumSize, and setSizePolicy seem to have no effect on the dock height.

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• Destroying the parent container and then reloading an updated one. The following code produces a segmentation fault. The code tries to pass an object from a new instance of the builder to the old one. I believe this to be my main problem. I don't know how to pass the instance of the builder I'm working with into on_refresh_button_click() without having to rewrite everything into a single class.

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