Enum HeaderSortState 

pub enum HeaderSortState {
    NotSorted,
    DescendingNullsFirst,
    AscendingNullsFirst,
    DescendingNullsLast,
    AscendingNullsLast,
}

Represents the interaction state for sorting a specific column header in the UI.

This enum manages the click cycle: NotSorted -> DescNullsFirst -> AscNullsFirst -> DescNullsLast -> AscNullsLast -> NotSorted. The actual applied cumulative sort state (Vec<SortBy>) is stored and managed separately in DataFrameContainer.

Variants

NotSorted

Column is not part of the current sort criteria list.

DescendingNullsFirst

Column sorted descending, nulls appear first.

AscendingNullsFirst

Column sorted ascending, nulls appear first.

DescendingNullsLast

Column sorted descending, nulls appear last.

AscendingNullsLast

Column sorted ascending, nulls appear last.

Implementations

impl HeaderSortState

pub fn cycle_next(&self) -> Self

Calculates the next interaction state in the UI cycle for a header click.

The cycle progresses as follows:

1. NotSorted -> DescendingNullsFirst
2. DescendingNullsFirst -> AscendingNullsFirst
3. AscendingNullsFirst -> DescendingNullsLast
4. DescendingNullsLast -> AscendingNullsLast
5. AscendingNullsLast -> NotSorted (removes the sort for this column)

Called by container.rs::render_table_header when a click is detected.

Returns

The next HeaderSortState in the cycle.

pub fn get_icon(&self, index: Option<usize>) -> String

Returns a Unicode icon visually representing the interaction state. Optionally includes the sort precedence index (1-based) if the column is sorted. Uses different symbols to distinguish nulls placement.

Used by the SortableHeaderRenderer trait implementation in traits.rs to display feedback in the table header (e.g., “1▼”, “2▲”, “3▽”, “4△”, “↕”).

Arguments

• index: Option<usize> - The 0-based index representing the sort precedence. None if not sorted.

Returns

A String containing the icon and optional index number.

Trait Implementations

impl Clone for HeaderSortState

fn clone(&self) -> HeaderSortState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HeaderSortState

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

Formats the value using the given formatter.

impl PartialEq for HeaderSortState

fn eq(&self, other: &HeaderSortState) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for HeaderSortState

impl StructuralPartialEq for HeaderSortState