Rows#

#RowRecord

Each row is a RowRecord — a thin wrapper around a HashMap<String, String> with a numeric ID:

pub struct RowRecord {
    pub id: u64,
    fields: HashMap<String, String>,
}

let mut row = RowRecord::new(0);
row.set("name", "Alice");
row.set("age", "30");

#Row height

All rows share the same height (model.row_height), set at creation time:

let model = GridModel::new(columns, rows, 32.0, 36.0);
//                                        ^^^^
//                                     row_height

Uniform row height enables O(1) row lookup: row_index = floor((y - header_height) / row_height).

#Row number gutter

A sticky column on the left displays row numbers (1-based). The gutter width auto-adjusts based on digit count:

width = max(digits × 9px + 24px, 40px)

#Row hover

SetHoveredRow highlights the row under the cursor:

state.apply(GridCommand::SetHoveredRow(Some(42)));
state.apply(GridCommand::SetHoveredRow(None)); // mouse left the grid

The hover color is controlled by --rs-grid-row-hover-bg (default: semi-transparent overlay).

#Alternating row backgrounds

Odd rows use the row_alt_bg theme color for subtle zebra striping. Customize with --rs-grid-row-alt-bg.

#Row count limits

Row indices are u64 (not usize), supporting up to ~9×10^14 rows with full f64 precision. On WASM32, usize is only 32 bits (4 GB), which is why row indices use u64 throughout.