VerticalSlider | VerticalSlider is a vertical slider control for iOS | iOS library

I made a vertical slider based on this answer, and now I need to add title and value for each sliders.

If I set a fixed width value in modifier like this modifier.width(180.dp), it looks fine like this

However I would like to let the slider height be responsive to the device screen size, so I set the width to modifier.fillMaxWidth(), the bottom text will disappear

Here is my vertical slider compose looks like, and I try to set the height in modifier here.

I import a function component B, onChange or onComplete can re-render B when data only change in B.

B:

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

I have made the following layout in QtDesigner 5.6.2, which looks fine in the QtDesigner GUI:

Basically, I want the buttons to be as wide as the text (plus margins), vertically they should expand as much as possible - but they should stick to the left.

The remaining space should be a horizontal layout hosting several sliders, and as is typical for a horizontal layout, they would be "evenly spaced" horizontally.

But when I hit Form/Preview... in the app (or also with the sample .py code below), I get this:

Basically, everything is "compressed" in center, and I do not get why this is?

How can I get the preview to be the same as in QtDesigner?

test1.ui

I have a txt file to configure settings of a serial device, which looks like this: