nagix/chartjs-plugin-style

'use strict';

import Chart from 'chart.js';
import StyleLine from '../elements/element.styleLine';
import StylePoint from '../elements/element.stylePoint';
import styleHelpers from '../helpers/helpers.style';

var helpers = Chart.helpers;

var extend = helpers.extend;

var LineController = Chart.controllers.line;

export default LineController.extend({

    datasetElementType: StyleLine,

    dataElementType: StylePoint,

    update: function() {
        var me = this;
        var line = me.getMeta().dataset;
        var options = styleHelpers.resolveLineStyle(me, line, me.chart.options.elements.line);
        var model = {};

        Object.defineProperty(line, '_model', {
            configurable: true,
            get: function() {
                return model;
            },
            set: function(value) {
                extend(model, value, options);
            }
        });

        LineController.prototype.update.apply(me, arguments);

        delete line._model;
        line._model = model;
        line._styleOptions = options;
    },

    updateElement: function(point, index) {
        var me = this;
        var options = styleHelpers.resolvePointStyle(me, point, index, me.chart.options.elements.point);

        LineController.prototype.updateElement.apply(me, arguments);

        extend(point._model, options);
        point._styleOptions = options;
    },

    setHoverStyle: function(element) {
        // Point
        var me = this;

        LineController.prototype.setHoverStyle.apply(me, arguments);

        styleHelpers.saveStyle(element);
        styleHelpers.setHoverStyle(element._model, element._styleOptions);
    },

    removeHoverStyle: function(element) {
        var me = this;

        // For Chart.js 2.7.2 backward compatibility
        if (!element.$previousStyle) {
            styleHelpers.mergeStyle(element._model, element._styleOptions);
        }

        LineController.prototype.removeHoverStyle.apply(me, arguments);
    }
});