Function InputTextCalcTextSizeW

core/src/imgui/imgui_widgets.cpp:3535–3578

}

static ImVec2 InputTextCalcTextSizeW(const ImWchar* text_begin, const ImWchar* text_end, const ImWchar** remaining, ImVec2* out_offset, bool stop_on_new_line)
{
    ImGuiContext& g = *GImGui;
    ImFont* font = g.Font;
    const float line_height = g.FontSize;
    const float scale = line_height / font->FontSize;

    ImVec2 text_size = ImVec2(0, 0);
    float line_width = 0.0f;

    const ImWchar* s = text_begin;
    while (s < text_end)
    {
        unsigned int c = (unsigned int)(*s++);
        if (c == '\n')
        {
            text_size.x = ImMax(text_size.x, line_width);
            text_size.y += line_height;
            line_width = 0.0f;
            if (stop_on_new_line)
                break;
            continue;
        }
        if (c == '\r')
            continue;

        const float char_width = font->GetCharAdvance((ImWchar)c) * scale;
        line_width += char_width;
    }

    if (text_size.x < line_width)
        text_size.x = line_width;

    if (out_offset)
        *out_offset = ImVec2(line_width, text_size.y + line_height);  // offset allow for the possibility of sitting after a trailing \n

    if (line_width > 0 || text_size.y == 0.0f)                        // whereas size.y will ignore the trailing \n
        text_size.y += line_height;

    if (remaining)
        *remaining = s;

    return text_size;
}

// Wrapper for stb_textedit.h to edit text (our wrapper is for: statically sized buffer, single-line, wchar characters. InputText converts between UTF-8 and wchar)
namespace ImStb