Opt-in Layout By Default

One of the defining strengths of PixiJS Layout is its non-invasive, opt-in design. Layout logic is only applied when explicitly requested. This enables seamless integration into existing PixiJS projects and flexibility:

• A parent will only apply layout to children that have layout enabled (layout property).
• Children without layout are unaffected and behave just like standard PixiJS objects.
• This makes the system safe by default and easy to adopt incrementally.

const container = new Container({
    layout: {
        width: 500,
        height: 500,
        justifyContent: 'center',
    },
});

const managed = new Sprite({ texture, layout: true });
const unmanaged = new Sprite(texture); // not in layout

container.addChild(managed, unmanaged);

In this case:

• managed will be centered in the layout box (positioned at 250,250).
• unmanaged will be placed at 0,0, unless you set its .x and .y manually.