Support for Selective Corner Rounding

[Talbe1]

Version/Branch of Dear ImGui:

Version 1.92.801, Branch: imgui_bundle

Back-ends:

Unapplicable

Compiler, OS:

Kubuntu 26.04 LTS, Windows 11 (Python using ImGui Bundle)

Full config/build information:

No response

Details:

I apologize if this feature request is inapplicable, I program in Python (3.10) using ImGui Bundle (1.92.801).
I am aware a similar issue already exists: #2057

The difficulty leading to this feature request:
I'm looking forward to making a Combo like widget where I can input text (using InputText) and have the combo popup. The end goal is to have a filter I can type into and will show matching results.

I started trying out things and got to a working result that mimics the look of the Combo, but wanted it to look exactly like it.

What I aimed for (screenshot taken from Pthom's Interactive Explorer):

What I currently have (notice the rounding between the input text and the arrow button):

What I was missing, was an easy way to make it so that:
The input text on the left side, has its left corners rounded, and right ones sharp.
The arrow button on the right, has its right corners rounded, and left ones sharp.

The feature I wish for:
The ability to selectively round corners for a widget.
Possibly using the push and pop style methods to round specific corner(s) each time.

Reasons for this request:

1. To have a consistent style of widgets in my application.
2. Having user input with a combo is a very common feature from what I've seen.
3. I wish to not have input text and combo widgets separately on the screen, as they take significantly more space.
4. I do not want to call the internal API functions of ImGui, which will complicate my code and possibly cause other issues. I did look at the source code (of BeginCombo) and attempted replicating and tweaking the combo widget in Python.

Screenshots/Video:

No response

Minimal, Complete and Verifiable Example code:

No response

[ocornut]

We are currently working on a large set of change for 1.93.
And coincidentally, one of the thing I've been working on today could be leveraged to achieve that.. stay tuned.

[ocornut]

I can confirm that with new (unpublished) code there is a way to do that:

It's currently prevented by an assert but given there is a use for it I am going to rework the assert.
I must stress that this will not be supported as a general styling thing (there are many small reasons why it would not be work well)
But in very specific low-levelish case, it should be able to solve your issue.

I don't expect the code to be in main branch before September+.

[Talbe1]

Sounds great. I would really like to give it a try (even in an unfinished state). Please let me know when possible, and what branch the feature is on.

I do think this feature could be used often, and that it would be beneficial to support as many widgets as possible.

[ocornut]

I do think this feature could be used often, and that it would be beneficial to support as many widgets as possible.

It works by overriding ImDrawFlags defaults, so any rounded shape in the scope would be a affected, which can be problematic but is enough for the case you described.

[tope99]

Selective window corners seem to be commonly used in android. See here:

The picture shows 2 different radiuses used. Ideally ImGui could support that.

//having 4 parameters for each corner (Big, Small, None)
ImGui::SetNextWindowCorners(ImRadius_Big, ImRadius_Big, ImRadius_Small, ImRadius_Small);

But maybe it's too much to ask?

[ocornut]

Yeah I don't intend to provide that sorts of stuff. It's only adding complexity to the lib, extra cost + work for programmers.