ExpansionTile

ExpansionTile control. Build it with the expansion_tile helper.

Example

expansion_tile(
  title: text("Title"),
  subtitle: text("Subtitle"),
  leading: icon("menu"),
  trailing: icon("chevron_right"),
  on_change: ->(event) {}
)

Properties

• adaptive — Adapts to the platform (Material/Cupertino) when true.
• affinity — Sets the affinity property.
• animation_style — Animation style.
• bgcolor — Background color.
• clip_behavior — How content overflowing the bounds is clipped.
• collapsed_bgcolor — Collapsed background color.
• collapsed_icon_color — Collapsed icon color.
• collapsed_shape — Sets the collapsed shape property.
• collapsed_text_color — Collapsed text color.
• controls — The list of child controls.
• controls_padding — Controls padding.
• dense — Sets the dense property.
• enable_feedback — Plays touch feedback (sound/haptic) on interaction.
• expanded — Sets the expanded property.
• expanded_alignment — Expanded alignment.
• expanded_cross_axis_alignment — Expanded cross axis alignment.
• icon_color — Color of the icon.
• leading — Control placed before the main content (e.g. an icon or avatar).
• maintain_state — Sets the maintain state property.
• min_tile_height — Min tile height.
• shape — Shape/border of the control.
• show_trailing_icon — Show trailing icon.
• subtitle — The control shown as the secondary line below the title.
• text_color — Text color.
• tile_padding — Tile padding.
• title — The control shown as the title.
• trailing — Control placed after the main content.
• visual_density — Compactness of the control's layout.

Common layout and animation properties

• align — Alignment of the control within its parent.
• 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.
• col — Responsive column span (1-12) per breakpoint.
• 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.
• 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_change — Fired when the value changes.
• on_size_change — Fired when the control's size changes.

Reference

• Family: materials
• Widget type: expansiontile
• Helpers: expansion_tile, expansiontile