Struct re_view_dataframe::expanded_rows::ExpandedRows

pub(crate) struct ExpandedRows<'a> {
    row_height: f32,
    cache: &'a mut ExpandedRowsCache,
    egui_ctx: Context,
    id: Id,
}

Helper to keep track of row expansion.

This is a short-lived struct to be created every frame. The persistent state is stored in ExpandedRowsCache.

Uses egui’s animation support to animate the row expansion/contraction. For this to work:

• When collapsed, the row entry must be set to 0 instead of being removed. Otherwise, it will no longer be “seen” by the animation code. Technically, it could be removed after the animation completes, but it’s not worth the complexity.
• When the row is first expanded, for the animation to work, it must be immediately seeded to 0 for the animation to have a starting point.

Fields

row_height: f32

Base row height.

cache: &'a mut ExpandedRowsCache

Cache containing the row expanded-ness.

egui_ctx: Context

[egui::Context] used to animate the row expansion.

id: Id

[egui::Id] used to store the animation state.

Implementations

impl<'a> ExpandedRows<'a>

pub(crate) fn new( egui_ctx: Context, id: Id, cache: &'a mut ExpandedRowsCache, row_height: f32, ) -> Self

Create a new ExpandedRows instance.

egui_ctx is used to animate the row expansion id is used to store the animation state and invalidate the cache, make it persistent and unique

pub(crate) fn row_top_offset(&self, row_nr: u64) -> f32

Implementation for [egui_table::TableDelegate::row_top_offset].

pub(crate) fn is_row_odd(&self, row_nr: u64) -> bool

Returns whether the first line of the specified row is odd.

This depends on how many additional lines the rows before have.

pub(crate) fn additional_lines_for_row(&self, row_nr: u64) -> u64

Return by how many additional lines this row is expended.

pub(crate) fn set_additional_lines_for_row( &mut self, row_nr: u64, additional_lines: u64, )

Set the expansion of a row.

Units are in extra row heights.

pub(crate) fn remove_additional_lines_for_row(&mut self, row_nr: u64)

Collapse a row.

fn row_id(&self, row_nr: u64) -> Id