Struct HeaderBuilder 

pub struct HeaderBuilder {
    pub levels: Vec<Vec<HeaderCell>>,
    pub total_columns: usize,
    pub default_style: CellStyle,
}

Builder for creating complex multi-level table headers

Fields

levels: Vec<Vec<HeaderCell>>

All header cells organized by levels

total_columns: usize

Total number of columns in the table

default_style: CellStyle

Default style for headers

Implementations

impl HeaderBuilder

pub fn new(total_columns: usize) -> Self

Create a new header builder

pub fn auto() -> Self

Create a new header builder without specifying columns (for compatibility with tests)

pub fn add_level(self, headers: Vec<(&str, usize)>) -> Self

Add a header level with (text, colspan) pairs

pub fn default_style(self, style: CellStyle) -> Self

Set default header style

pub fn add_simple_row(self, headers: Vec<&str>) -> Self

Add a simple single-level header row

pub fn add_custom_row(self, cells: Vec<HeaderCell>) -> Self

Add a header row with custom cells

pub fn add_group(self, group_header: &str, sub_headers: Vec<&str>) -> Self

Add a grouped header (spans multiple columns) with sub-headers

Example: “Sales Data” spanning 3 columns with sub-headers “Q1”, “Q2”, “Q3”

pub fn add_complex_header( self, text: &str, start_col: usize, colspan: usize, rowspan: usize, ) -> Self

Add a complex header structure with manual positioning

pub fn row_count(&self) -> usize

Get the total number of header rows

pub fn calculate_height(&self) -> f64

Get the height needed for headers (in points, assuming default font size)

pub fn validate(&self) -> Result<(), TableError>

Validate the header structure

pub fn get_cells_at_position( &self, level: usize, col: usize, ) -> Vec<&HeaderCell>

Get all cells that should be rendered at a specific position

pub fn financial_report() -> Self

Create a financial report header

pub fn product_comparison(products: Vec<&str>) -> Self

Create a product comparison header

Trait Implementations

impl Clone for HeaderBuilder

fn clone(&self) -> HeaderBuilder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HeaderBuilder

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

Formats the value using the given formatter.

impl Default for HeaderBuilder

fn default() -> Self

Returns the “default value” for a type.