Struct StackParentData 

pub struct StackParentData {
    pub top: Option<f64>,
    pub right: Option<f64>,
    pub bottom: Option<f64>,
    pub left: Option<f64>,
    pub width: Option<f64>,
    pub height: Option<f64>,
    /* private fields */
}

Parent data for use with RenderStack.

Fields

top: Option<f64>

The distance by which the child’s top edge is inset from the top of the stack.

right: Option<f64>

The distance by which the child’s right edge is inset from the right of the stack.

bottom: Option<f64>

The distance by which the child’s bottom edge is inset from the bottom of the stack.

left: Option<f64>

The distance by which the child’s left edge is inset from the left of the stack.

width: Option<f64>

The child’s width.

Ignored if both left and right are non-null.

height: Option<f64>

The child’s height.

Ignored if both top and bottom are non-null.

Implementations

impl StackParentData

pub const fn new() -> StackParentData

Creates stack parent data for a non-positioned child.

pub fn rect(&self) -> RelativeRect

The current values in terms of a RelativeRect.

Panics

If any of the four edges is unset.

pub fn set_rect(&mut self, value: RelativeRect)

Sets rect.

pub fn is_positioned(&self) -> bool

Whether this child is considered positioned.

A child is positioned if any of the top, right, bottom, or left properties are non-null. Positioned children do not factor into determining the size of the stack but are instead placed relative to the non-positioned children in the stack.

pub fn positioned_child_constraints(&self, stack_size: Size) -> BoxConstraints

Computes the BoxConstraints the stack layout algorithm would give to this child, given the Size of the stack.

This method should only be called when is_positioned is true for the child.

Trait Implementations

impl ContainerBoxParentData for StackParentData

fn box_parent_data(&self) -> &BoxParentData

Mixin field access: the BoxParentData half.

fn box_parent_data_mut(&mut self) -> &mut BoxParentData

See box_parent_data.

fn offset(&self) -> Offset

The offset at which to paint the child in the parent’s coordinate system.

fn set_offset(&mut self, value: Offset)

Sets offset.

impl ContainerParentDataMixin for StackParentData

type ChildType = AnyRenderBox

The type-erased handle of a child in the list. AnyRenderBox for a box container.

fn container_parent_data(&self) -> &ContainerParentData<AnyRenderBox>

Mixin field access.

fn container_parent_data_mut( &mut self, ) -> &mut ContainerParentData<AnyRenderBox>

See container_parent_data.

fn previous_sibling(&self) -> Option<Self::ChildType>

The previous sibling in the parent’s child list.

fn set_previous_sibling(&mut self, value: Option<Self::ChildType>)

Sets previous_sibling.

fn next_sibling(&self) -> Option<Self::ChildType>

The next sibling in the parent’s child list.

fn set_next_sibling(&mut self, value: Option<Self::ChildType>)

Sets next_sibling.

fn detach(&mut self)

Clear the sibling pointers.

impl Debug for StackParentData

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for StackParentData

fn default() -> StackParentData

Returns the “default value” for a type.

impl Display for StackParentData

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ParentData for StackParentData

fn detach(&mut self)

Called when the render object is removed from the tree.

fn provide(&self, id: TypeId) -> Option<&dyn Any>

The half of this parent data whose type is id, if it embeds one.

fn provide_mut(&mut self, id: TypeId) -> Option<&mut dyn Any>

See provide; mirrors it exactly.