StackPanel

Overlay container stacking all children within a shared rectangular slot.

Overview

StackPanel is an overlay container where every non-collapsed child is placed in the same shared rectangular slot. Each child is aligned according to its own margin, preferred size, and alignment rules (Alignment.STRETCH, CENTER, etc.).

This makes StackPanel ideal for composition: layering decorative backdrops, content, notification badges, or watermark overlays on top of one another.

Overlay Badge over Avatar

StackPanel stack = new StackPanel();
stack.addChild(avatarImage);
badge.layout(style -> style
        .position(PositionType.ABSOLUTE)
        .inset(0.0f, Float.NaN, Float.NaN, 0.0f));
stack.addChild(badge);

Related links

• Box
• PanelWidget

API

StackPanel::arrangeChild(Widget, float, float, float, float)

Arrange Child

Arranges a child inside assigned slot bounds applying margin and alignment.

Parameter	Type	Description
child	Widget	Child widget to add
slotX	float	slot X coordinate
slotY	float	slot Y coordinate
slotWidth	float	slot width
slotHeight	float	slot height