Stack

Layer controls on top of each other.

Example

stack(
  children: [
    container(width: 220, height: 140, bgcolor: "#1f2937"),
    container(width: 120, height: 48, bgcolor: "#0ea5e9")
  ]
)

Common properties

• children
• expand
• width
• height

Usage

Use stack for overlays, badges, or layered presentation:

stack(
  children: [
    image("https://picsum.photos/320/180", width: 320, height: 180),
    container(
      padding: 8,
      bgcolor: "#111827cc",
      content: text(value: "Preview")
    )
  ]
)

Notes

• Child order matters because later controls render on top

Complete API

Helpers

• stack(children = ..., **props, &block)

Accepted properties

• adaptive — Adapts to the platform (Material/Cupertino) when true.
• align — Alignment of the control within its parent.
• alignment — Alignment of the content within the control.
• animate_align — Animates alignment changes.
• animate_margin — Animates margin changes.
• animate_offset — Animates offset changes.
• animate_opacity — Animates opacity changes.
• animate_position — Animates position changes.
• animate_rotation — Animates rotation changes.
• animate_scale — Animates scale changes.
• animate_size — Animates size changes.
• aspect_ratio — Width-to-height ratio to maintain.
• badge — Badge drawn on the corner of the control.
• bottom — Bottom offset when positioned inside a stack.
• clip_behavior — How content overflowing the bounds is clipped.
• col — Responsive column span (1-12) per breakpoint.
• controls — The list of child controls.
• data — Arbitrary value you can attach to the control and read back in handlers.
• disabled — Disables interaction when true.
• expand — Fills the available space along the parent's main axis when true.
• expand_loose — Like expand, but only grows up to the child's natural size.
• fit — Sets the fit property.
• height — Fixed height in logical pixels.
• key — Stable identity used to preserve state across rebuilds.
• left — Left offset when positioned inside a stack.
• margin — Outer spacing around the control.
• offset — Translation offset applied to the control.
• opacity — Opacity from 0.0 (transparent) to 1.0 (opaque).
• right — Right offset when positioned inside a stack.
• rotate — Rotation applied to the control.
• rtl — Renders right-to-left when true.
• scale — Scale transform applied to the control.
• size_change_interval — Throttle interval for on_size_change, in ms.
• tooltip — Text shown on hover/long-press.
• top — Top offset when positioned inside a stack.
• visible — Hides the control when false.
• width — Fixed width in logical pixels.

Events

• on_animation_end — Fired when an animation completes.
• on_size_change — Fired when the control's size changes.

Wire reference

• Family: shared
• Widget type: stack