slate-edit-table/dist/handlers/onBackspace.js

A Slate plugin to handle keyboard events in tables.

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

require('slate');

var _changes = require('../changes');

function onBackspace(event, change, editor, opts) {
    var value = change.value;
    var startBlock = value.startBlock,
        startOffset = value.startOffset,
        isCollapsed = value.isCollapsed,
        endBlock = value.endBlock,
        document = value.document;


    var startCell = document.getClosest(startBlock.key, opts.isCell);
    var endCell = document.getClosest(endBlock.key, opts.isCell);

    var startBlockIndex = startCell.nodes.findIndex(function (block) {
        return block.key == startBlock.key;
    });

    // If a cursor is collapsed at the start of the first block, do nothing
    if (startOffset === 0 && isCollapsed && startBlockIndex === 0) {
        event.preventDefault();
        return change;
    }

    // If "normal" deletion, we continue
    if (startCell === endCell) {
        return undefined;
    }

    // If cursor is between multiple blocks,
    // we clear the content of the cells
    event.preventDefault();

    var blocks = value.blocks;

    // Get all cells that contains the selection

    var cells = blocks.map(function (node) {
        return node.type === opts.typeCell ? node : document.getClosest(node.key, function (a) {
            return a.type === opts.typeCell;
        });
    }).toSet();

    // Clear all the selection
    cells.forEach(function (block) {
        return (0, _changes.clearCell)(opts, change, block);
    });

    // Update the selection to avoid reset of selection
    var updatedCell = change.value.document.getDescendant(cells.last().key);
    return change.collapseToStartOf(updatedCell);
}

exports.default = onBackspace;