Struct webrender_traits::display_list::ScrollTree

pub struct ScrollTree {
    pub nodes: Vec<ScrollTreeNode>,
}

A tree of spatial nodes, which mirrors the spatial nodes in the WebRender display list, except these are used to scrolling in the compositor so that new offsets can be sent to WebRender.

Fields

nodes: Vec<ScrollTreeNode>

A list of compositor-side scroll nodes that describe the tree of WebRender spatial nodes, used by the compositor to scroll the contents of the display list.

Implementations

impl ScrollTree

pub fn add_scroll_tree_node( &mut self, parent: Option<&ScrollTreeNodeId>, spatial_id: SpatialId, scroll_info: Option<ScrollableNodeInfo>, ) -> ScrollTreeNodeId

Add a scroll node to this ScrollTree returning the id of the new node.

pub fn get_node_mut(&mut self, id: &ScrollTreeNodeId) -> &mut ScrollTreeNode

Get a mutable reference to the node with the given index.

pub fn get_node(&mut self, id: &ScrollTreeNodeId) -> &ScrollTreeNode

Get an immutable reference to the node with the given index.

pub fn scroll_node_or_ancestor( &mut self, scroll_node_id: &ScrollTreeNodeId, scroll_location: ScrollLocation, ) -> Option<(ExternalScrollId, LayoutVector2D)>

Scroll the given scroll node on this scroll tree. If the node cannot be scrolled, because it isn’t a scrollable node or it’s already scrolled to the maximum scroll extent, try to scroll an ancestor of this node. Returns the node scrolled and the new offset if a scroll was performed, otherwise returns None.

pub fn set_scroll_offsets_for_node_with_external_scroll_id( &mut self, external_scroll_id: ExternalScrollId, offset: LayoutVector2D, ) -> bool

Given an ExternalScrollId and an offset, update the scroll offset of the scroll node with the given id.

Trait Implementations

impl Debug for ScrollTree

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

Formats the value using the given formatter.

impl Default for ScrollTree

fn default() -> ScrollTree

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ScrollTree

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ScrollTree

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.