Method TabBarScrollingButtons

KBotExt/imgui/imgui_widgets.cpp:8112–8171

}

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));
	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 | ImGuiButtonFlags_Repeat))
		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 | ImGuiButtonFlags_Repeat))
		select_dir = +1;
	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;
	tab_bar->BarRect.Max.x -= scrolling_buttons_width + 1.0f;