LayoutChangingModifier

interface LayoutChangingModifier

A Modifier.Element that can alter a node's position and the Constraints seen by the node and its children.

Implement this interface alongside Modifier.Element when a modifier needs to change where the node is placed (e.g. net.kernelpanicsoft.archie.gui.modifiers.position.OffsetModifier, net.kernelpanicsoft.archie.gui.modifiers.position.MarginModifier) or the space available to the node's subtree (e.g. net.kernelpanicsoft.archie.gui.modifiers.SizeModifier, net.kernelpanicsoft.archie.gui.modifiers.position.PaddingModifier).

Inheritors

• SizeModifier
• HorizontalFillModifier
• VerticalFillModifier
• MarginModifier
• OffsetModifier

Functions

modifyInnerConstraints

open fun modifyInnerConstraints(constraints: Constraints): Constraints

Adjusts the Constraints passed into this node for measuring its children.

Use this to reduce the available space before measuring children (e.g. padding).

Return

The constraints to use when measuring this node's children.

Parameters

• constraints: The constraints supplied by this node's parent.

modifyLayoutConstraints

open fun modifyLayoutConstraints(measuredSize: IntSize, constraints: Constraints): Constraints

Adjusts the Constraints as seen by the parent when it lays out this node.

Use this to report a different effective size to the parent (e.g. after accounting for margin space that the parent should reserve).

Return

The constraints the parent should use when accounting for this node's footprint.

Parameters

• measuredSize: The actual measured size of this node.

• constraints: The constraints originally passed by the parent.

modifyPosition

open fun modifyPosition(offset: IntOffset): IntOffset

Shifts the node's placement by transforming the parent-supplied offset.

Return

The adjusted position for this node.

Parameters

• offset: The position computed by the parent layout.