Struct WindowReader 

pub struct WindowReader { /* private fields */ }

How RowWindow reads a source; from RowWindow::reader.

Implementations

impl WindowReader

pub fn offset(self, offset: usize) -> Self

Start the window at row offset (0-based, default 0).

pub fn len(self, rows: usize) -> Self

Keep rows rows (default 20, at most MAX_HEIGHT).

pub fn sample(self, rows: usize) -> Self

Also keep the first rows rows, for column widths and alignment (default DEFAULT_SAMPLE, at most MAX_SAMPLE).

pub fn count(self, count: bool) -> Self

Read to the end to count the rows (default on). Off, reading stops one row past the window, so the position says of 1,041+.

pub fn read(&self, source: impl RowSource) -> Result<RowWindow, DataError>

Read source once, keeping the window. An offset past the end gives the last full window, as a VirtualTable does. A row that cannot be read is an error, wherever it is.

Trait Implementations

impl Clone for WindowReader

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WindowReader

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

Formats the value using the given formatter.

impl Default for WindowReader

fn default() -> Self

Returns the “default value” for a type.