handsontable/shortcutContexts/commands/moveCellSelection/downByViewportHeight.js

Handsontable is a JavaScript Data Grid available for React, Angular and Vue.

"use strict";

exports.__esModule = true;
const command = exports.command = {
  name: 'moveCellSelectionDownByViewportHeight',
  callback(hot) {
    const {
      selection
    } = hot;
    const {
      navigableHeaders
    } = hot.getSettings();
    const columnHeadersCount = navigableHeaders ? hot.countColHeaders() : 0;
    const {
      row
    } = hot.getSelectedRangeLast().highlight;
    let rowsStep = hot.countVisibleRows() + columnHeadersCount;
    rowsStep = rowsStep === 0 ? 1 : rowsStep;

    // if the last row is currently selected move the focus to the first row (if autoWrap is enabled)
    if (row === hot.countRows() - 1) {
      rowsStep = 1;

      // if the next move would move the focus off the table calculate the delta to move the selection to
      // the last row
    } else if (row + rowsStep > hot.countRows()) {
      rowsStep = hot.countRows() - row - 1;
    }
    selection.markSource('keyboard');
    selection.transformStart(rowsStep, 0);
    selection.markEndSource();
    if (hot.getSelectedRangeLast().highlight.row < 0) {
      hot.scrollViewportTo({
        row: 0
      });
    }
  }
};