Struct GridCalc 

pub struct GridCalc {
    pub x: i32,
    pub y: i32,
    pub cols: usize,
    pub col_w: i32,
    pub row_h: i32,
    pub col_gap: i32,
    pub row_gap: i32,
}

Pure-geometry grid calculator for manual widget layouts.

Unlike Grid, this does not own widgets — it only computes cell Rects from (row, col) indices, making it suitable for custom widgets that do their own drawing and hit-testing.

let g = GridCalc::new(10, 20, 2, 100, 40).gap(4, 2);
let r = g.cell(1, 0);
assert_eq!(r, Rect { x: 10, y: 62, width: 100, height: 40 });

Fields

x: i32

Top-left origin X.

y: i32

Top-left origin Y.

cols: usize

Number of columns.

col_w: i32

Width of each cell.

row_h: i32

Height of each cell.

col_gap: i32

Horizontal gap between columns.

row_gap: i32

Vertical gap between rows.

Implementations

impl GridCalc

pub const fn new(x: i32, y: i32, cols: usize, col_w: i32, row_h: i32) -> Self

Create a grid calculator with the given origin, column count, and cell size.

pub const fn gap(self, col_gap: i32, row_gap: i32) -> Self

Set inter-cell gaps.

pub const fn cell(&self, row: usize, col: usize) -> Rect

Return the Rect for the cell at (row, col).

pub const fn row_span(&self, row: usize) -> Rect

Return a Rect spanning all columns for the given row.

pub const fn total_width(&self) -> i32

Total width of the grid (all columns + gaps).

pub const fn total_height(&self, rows: usize) -> i32

Total height of the grid for the given number of rows.