Struct MessageScrollerState 

pub struct MessageScrollerState { /* private fields */ }

The entity-owned scrolling state for a MessageScroller.

The state owns only GPUI’s virtual-list bookkeeping. Message data remains with the caller and is read by the row renderer passed to MessageScroller::new.

Implementations

impl MessageScrollerState

pub fn new(item_count: usize, cx: &mut Context<'_, Self>) -> Self

Create a state for item_count rows and enable tail following.

The constructor receives the entity context so the list’s scroll handler can safely defer its entity update until GPUI has released the list’s internal borrow.

pub fn item_count(&self) -> usize

Return the current number of rows known by the virtual list.

pub fn is_scrolled_up(&self) -> bool

Return whether the user has scrolled away from the latest content.

pub fn is_following_tail(&self) -> bool

Return whether the list is actively following its tail.

pub fn reset(&mut self, item_count: usize, cx: &mut Context<'_, Self>)

Reset the list to item_count rows.

pub fn splice( &mut self, old_range: Range<usize>, count: usize, cx: &mut Context<'_, Self>, ) -> bool

Replace old_range with count new rows.

Returns false when the range is outside the current list and leaves the state unchanged.

pub fn append(&mut self, count: usize, cx: &mut Context<'_, Self>) -> bool

Append count rows to the end of the list.

pub fn prepend(&mut self, count: usize, cx: &mut Context<'_, Self>) -> bool

Prepend count rows while preserving the current scroll anchor.

pub fn remeasure(&mut self, cx: &mut Context<'_, Self>)

Mark all rows for remeasurement while preserving a proportional anchor.

pub fn remeasure_items( &mut self, range: Range<usize>, cx: &mut Context<'_, Self>, ) -> bool

Mark rows in range for remeasurement while preserving an item anchor.

Returns false when the range is outside the current list.

pub fn scroll_to_item( &mut self, index: usize, cx: &mut Context<'_, Self>, ) -> bool

Scroll to the row at index, if it exists.

pub fn scroll_to_end(&mut self, cx: &mut Context<'_, Self>)

Resume tail following and scroll to the latest row.