Switcher:active_child

Returns which of its children this switcher is drawing. If a transition is in progress, this returns the child being transitioned to.

An empty Switcher has no active child. When you first add a child to a Switcher, it immediately becomes the active child.

This function is unrelated to UIElement:set_active.

Usage

switcher:active_child()

Returns

Name	Type	Description
child	UIElement | nil	Active child.

Examples

local manual = crystal.Switcher:new();
local page_1 = manual:add_child(crystal.Image:new(crystal.assets.get("page_1.png")));
local page_2 = manual:add_child(crystal.Image:new(crystal.assets.get("page_2.png")));
local page_3 = manual:add_child(crystal.Image:new(crystal.assets.get("page_3.png")));

assert(manual:active_child() == page_1);
manual:switch_to(page_2);
assert(manual:active_child() == page_2);