Method InputTextEx

src/external/imgui/imgui_widgets.cpp:4085–5032

Edit a string of text - buf_size account for the zero-terminator, so a buf_size of 6 can hold "Hello" but not "Hello!". This is so we can easily call InputText() on static arrays using ARRAYSIZE() and to match Note that in std::string world, capacity() would omit 1 byte used by the zero-terminator. - When active, hold on a privately held copy of the text (and apply back to 'buf'). So changing 'buf

// (FIXME: Rather confusing and messy function, among the worse part of our codebase, expecting to rewrite a V2 at some point.. Partly because we are
//  doing UTF8 > U16 > UTF8 conversions on the go to easily interface with stb_textedit. Ideally should stay in UTF-8 all the time. See https://github.com/nothings/stb/issues/188)
bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_size, const ImVec2& size_arg, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* callback_user_data)
{
    ImGuiWindow* window = GetCurrentWindow();
    if (window->SkipItems)
        return false;

    IM_ASSERT(buf != NULL && buf_size >= 0);
    IM_ASSERT(!((flags & ImGuiInputTextFlags_CallbackHistory) && (flags & ImGuiInputTextFlags_Multiline)));        // Can't use both together (they both use up/down keys)
    IM_ASSERT(!((flags & ImGuiInputTextFlags_CallbackCompletion) && (flags & ImGuiInputTextFlags_AllowTabInput))); // Can't use both together (they both use tab key)

    ImGuiContext& g = *GImGui;
    ImGuiIO& io = g.IO;
    const ImGuiStyle& style = g.Style;

    const bool RENDER_SELECTION_WHEN_INACTIVE = false;
    const bool is_multiline = (flags & ImGuiInputTextFlags_Multiline) != 0;

    if (is_multiline) // Open group before calling GetID() because groups tracks id created within their scope (including the scrollbar)
        BeginGroup();
    const ImGuiID id = window->GetID(label);
    const ImVec2 label_size = CalcTextSize(label, NULL, true);
    const ImVec2 frame_size = CalcItemSize(size_arg, CalcItemWidth(), (is_multiline ? g.FontSize * 8.0f : label_size.y) + style.FramePadding.y * 2.0f); // Arbitrary default of 8 lines high for multi-line
    const ImVec2 total_size = ImVec2(frame_size.x + (label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f), frame_size.y);

    const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + frame_size);
    const ImRect total_bb(frame_bb.Min, frame_bb.Min + total_size);

    ImGuiWindow* draw_window = window;
    ImVec2 inner_size = frame_size;
    ImGuiLastItemData item_data_backup;
    if (is_multiline)
    {
        ImVec2 backup_pos = window->DC.CursorPos;
        ItemSize(total_bb, style.FramePadding.y);
        if (!ItemAdd(total_bb, id, &frame_bb, ImGuiItemFlags_Inputable))
        {
            EndGroup();
            return false;
        }
        item_data_backup = g.LastItemData;
        window->DC.CursorPos = backup_pos;

        // Prevent NavActivation from Tabbing when our widget accepts Tab inputs: this allows cycling through widgets without stopping.
        if (g.NavActivateId == id && (g.NavActivateFlags & ImGuiActivateFlags_FromTabbing) && (flags & ImGuiInputTextFlags_AllowTabInput))
            g.NavActivateId = 0;

        // Prevent NavActivate reactivating in BeginChild() when we are already active.
        const ImGuiID backup_activate_id = g.NavActivateId;
        if (g.ActiveId == id) // Prevent reactivation
            g.NavActivateId = 0;

        // We reproduce the contents of BeginChildFrame() in order to provide 'label' so our window internal data are easier to read/debug.
        PushStyleColor(ImGuiCol_ChildBg, style.Colors[ImGuiCol_FrameBg]);
        PushStyleVar(ImGuiStyleVar_ChildRounding, style.FrameRounding);
        PushStyleVar(ImGuiStyleVar_ChildBorderSize, style.FrameBorderSize);
        PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0, 0)); // Ensure no clip rect so mouse hover can reach FramePadding edges
        bool child_visible = BeginChildEx(label, id, frame_bb.GetSize(), true, ImGuiWindowFlags_NoMove);
        g.NavActivateId = backup_activate_id;