Specify button label start and end

[Trider12]

This is a tiny PR that allows users to specify the start and the end of a label for Button and SmallButton. It eases integrating buttons into text without making a copy of the labels.

I can also add the same functionality to Checkbox and RadioButton in this PR if needed.

[rokups]

We have a feature in the works that would add same thing to most APIs. #3038

[ocornut]

Hello @Trider12,

As answered, even though this is a valid need, this will be best answered by the https://github.com/ocornut/imgui/tree/features/string_view branch without adding extra API entry point. Therefore we cannot take a PR for this.

PS:
While this is orthogonal to dear imgui, I've noticed many people using underwhelming string helpers making their life harder than it should. With my mini library https://github.com/ocornut/Str I would do something like:

ImGui::Button(Str64f("%.*s", label_end - label, label).c_str());

For a similar result. Clearly not ideal it would still require a copy, but no heap allocation involved.

[Trider12]

Oh, I see. Looking forward to that feature being merged then.

Hi @ocornut, thanks for the tip, but I'll stick to the non-copying solution for now.