Method TabBarScrollingButtons

include/imgui/imgui_widgets.cpp:10411–10472

}

static ImGuiTabItem* ImGui::TabBarScrollingButtons(ImGuiTabBar* tab_bar)
{
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;

    const ImVec2 arrow_button_size(g.FontSize - 2.0f, g.FontSize + g.Style.FramePadding.y * 2.0f);
    const float scrolling_buttons_width = arrow_button_size.x * 2.0f;

    const ImVec2 backup_cursor_pos = window->DC.CursorPos;
    //window->DrawList->AddRect(ImVec2(tab_bar->BarRect.Max.x - scrolling_buttons_width, tab_bar->BarRect.Min.y), ImVec2(tab_bar->BarRect.Max.x, tab_bar->BarRect.Max.y), IM_COL32(255,0,0,255));

    int select_dir = 0;
    ImVec4 arrow_col = g.Style.Colors[ImGuiCol_Text];
    arrow_col.w *= 0.5f;

    PushStyleColor(ImGuiCol_Text, arrow_col);
    PushStyleColor(ImGuiCol_Button, ImVec4(0, 0, 0, 0));
    PushItemFlag(ImGuiItemFlags_ButtonRepeat | ImGuiItemFlags_NoNav, true);
    const float backup_repeat_delay = g.IO.KeyRepeatDelay;
    const float backup_repeat_rate = g.IO.KeyRepeatRate;
    g.IO.KeyRepeatDelay = 0.250f;
    g.IO.KeyRepeatRate = 0.200f;
    float x = ImMax(tab_bar->BarRect.Min.x, tab_bar->BarRect.Max.x - scrolling_buttons_width);
    window->DC.CursorPos = ImVec2(x, tab_bar->BarRect.Min.y);
    if (ArrowButtonEx("##<", ImGuiDir_Left, arrow_button_size, ImGuiButtonFlags_PressedOnClick))
        select_dir = -1;
    window->DC.CursorPos = ImVec2(x + arrow_button_size.x, tab_bar->BarRect.Min.y);
    if (ArrowButtonEx("##>", ImGuiDir_Right, arrow_button_size, ImGuiButtonFlags_PressedOnClick))
        select_dir = +1;
    PopItemFlag();
    PopStyleColor(2);
    g.IO.KeyRepeatRate = backup_repeat_rate;
    g.IO.KeyRepeatDelay = backup_repeat_delay;

    ImGuiTabItem* tab_to_scroll_to = NULL;
    if (select_dir != 0)
        if (ImGuiTabItem* tab_item = TabBarFindTabByID(tab_bar, tab_bar->SelectedTabId))
        {
            int selected_order = TabBarGetTabOrder(tab_bar, tab_item);
            int target_order = selected_order + select_dir;

            // Skip tab item buttons until another tab item is found or end is reached
            while (tab_to_scroll_to == NULL)
            {
                // If we are at the end of the list, still scroll to make our tab visible
                tab_to_scroll_to = &tab_bar->Tabs[(target_order >= 0 && target_order < tab_bar->Tabs.Size) ? target_order : selected_order];

                // Cross through buttons
                // (even if first/last item is a button, return it so we can update the scroll)
                if (tab_to_scroll_to->Flags & ImGuiTabItemFlags_Button)
                {
                    target_order += select_dir;
                    selected_order += select_dir;
                    tab_to_scroll_to = (target_order < 0 || target_order >= tab_bar->Tabs.Size) ? tab_to_scroll_to : NULL;
                }
            }
        }
    window->DC.CursorPos = backup_cursor_pos;