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109 lines
3.6 KiB
JavaScript
109 lines
3.6 KiB
JavaScript
"use strict";
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module.exports = function(Chart) {
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var helpers = Chart.helpers;
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var noop = helpers.noop;
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// Base class for all dataset controllers (line, bar, etc)
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Chart.DatasetController = function(chart, datasetIndex) {
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this.initialize.call(this, chart, datasetIndex);
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};
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helpers.extend(Chart.DatasetController.prototype, {
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initialize: function(chart, datasetIndex) {
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this.chart = chart;
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this.index = datasetIndex;
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this.linkScales();
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this.addElements();
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},
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updateIndex: function(datasetIndex) {
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this.index = datasetIndex;
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},
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linkScales: function() {
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var meta = this.getMeta();
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var dataset = this.getDataset();
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if (meta.xAxisID === null) {
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meta.xAxisID = dataset.xAxisID || this.chart.options.scales.xAxes[0].id;
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}
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if (meta.yAxisID === null) {
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meta.yAxisID = dataset.yAxisID || this.chart.options.scales.yAxes[0].id;
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}
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},
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getDataset: function() {
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return this.chart.data.datasets[this.index];
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},
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getMeta: function() {
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return this.chart.getDatasetMeta(this.index);
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},
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getScaleForId: function(scaleID) {
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return this.chart.scales[scaleID];
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},
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reset: function() {
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this.update(true);
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},
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buildOrUpdateElements: function buildOrUpdateElements() {
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// Handle the number of data points changing
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var meta = this.getMeta(),
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md = meta.data,
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numData = this.getDataset().data.length,
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numMetaData = md.length;
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// Make sure that we handle number of datapoints changing
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if (numData < numMetaData) {
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// Remove excess bars for data points that have been removed
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md.splice(numData, numMetaData - numData);
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} else if (numData > numMetaData) {
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// Add new elements
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for (var index = numMetaData; index < numData; ++index) {
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this.addElementAndReset(index);
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}
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}
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},
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// Controllers should implement the following
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addElements: noop,
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addElementAndReset: noop,
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draw: function(ease) {
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var easingDecimal = ease || 1;
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helpers.each(this.getMeta().data, function(element, index) {
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element.transition(easingDecimal).draw();
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});
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},
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removeHoverStyle: function(element, elementOpts) {
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var dataset = this.chart.data.datasets[element._datasetIndex],
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index = element._index,
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custom = element.custom || {},
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valueOrDefault = helpers.getValueAtIndexOrDefault,
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color = helpers.color,
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model = element._model;
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model.backgroundColor = custom.backgroundColor ? custom.backgroundColor : valueOrDefault(dataset.backgroundColor, index, elementOpts.backgroundColor);
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model.borderColor = custom.borderColor ? custom.borderColor : valueOrDefault(dataset.borderColor, index, elementOpts.borderColor);
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model.borderWidth = custom.borderWidth ? custom.borderWidth : valueOrDefault(dataset.borderWidth, index, elementOpts.borderWidth);
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},
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setHoverStyle: function(element) {
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var dataset = this.chart.data.datasets[element._datasetIndex],
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index = element._index,
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custom = element.custom || {},
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valueOrDefault = helpers.getValueAtIndexOrDefault,
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color = helpers.color,
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getHoverColor = helpers.getHoverColor,
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model = element._model;
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model.backgroundColor = custom.hoverBackgroundColor ? custom.hoverBackgroundColor : valueOrDefault(dataset.hoverBackgroundColor, index, getHoverColor(model.backgroundColor));
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model.borderColor = custom.hoverBorderColor ? custom.hoverBorderColor : valueOrDefault(dataset.hoverBorderColor, index, getHoverColor(model.borderColor));
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model.borderWidth = custom.hoverBorderWidth ? custom.hoverBorderWidth : valueOrDefault(dataset.hoverBorderWidth, index, model.borderWidth);
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},
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update: noop
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});
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Chart.DatasetController.extend = helpers.inherits;
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}; |