Wrapping of ImFont.calc_word_wrap_position_a

[thiago4455]

Hello! I am using the python bindings and looking for a way to change colors mid-text in a text_wrapped.
I've been trying to port this code: ocornut/imgui#2313 (comment)

But the font.calc_word_wrap_position_a requires pointers for the start and end of the text, and in the python function signature the parameters are actually just strings.
Am I missing something? Any Ideas on how I could adapt such code?

[pthom]

ImFont::CalcWordWrapPositionA(...) makes a heavy usage of char * :

    IMGUI_API const char*       CalcWordWrapPositionA(float scale, const char* text, const char* text_end, float wrap_width);

It even returns returns an inner pointer in the original string. Python's way of handling strings (which are immutable) is very different from this.

Adding a binding for this would require a substantial modification to the API, e.g (untested):

    // Returns an index in the string
    IMGUI_API int       CalcWordWrapPositionA_ForPython(float scale, const char* text, float wrap_width);

(I'm not even sure this API is the correct way to go: what do you think?)

---

Related question:

The API below is available in the ImGui namespace:

C++:

    IMGUI_API ImVec2        CalcTextSize(const char* text, const char* text_end = NULL, bool hide_text_after_double_hash = false, float wrap_width = -1.0f);

Python:

def calc_text_size(
    text: str, text_end: Optional[str] = None, hide_text_after_double_hash: bool = False, wrap_width: float = -1.0
) -> ImVec2:

Would that be enough for you need?

[pthom]

See commit c371bcf

It adds calc_word_wrap_position_a_python which returns an index in the string.

[thiago4455]

Awesome! I had to take a break on this issue, but I will try it out as soon as I can.
Thank you so much