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+Sencha Documentation Project/**
+ * @class Ext.chart.LegendItem
+ * @extends Ext.draw.CompositeSprite
+ * A single item of a legend (marker plus label)
+ * @constructor
+ */
+Ext.define('Ext.chart.LegendItem', {
+
+ /* Begin Definitions */
+
+ extend: 'Ext.draw.CompositeSprite',
+
+ requires: ['Ext.chart.Shape'],
+
+ /* End Definitions */
+
+ // Position of the item, relative to the upper-left corner of the legend box
+ x: 0,
+ y: 0,
+ zIndex: 500,
+
+ constructor: function(config) {
+ this.callParent(arguments);
+ this.createLegend(config);
+ },
+
+ /**
+ * Creates all the individual sprites for this legend item
+ */
+ createLegend: function(config) {
+ var me = this,
+ index = config.yFieldIndex,
+ series = me.series,
+ seriesType = series.type,
+ idx = me.yFieldIndex,
+ legend = me.legend,
+ surface = me.surface,
+ refX = legend.x + me.x,
+ refY = legend.y + me.y,
+ bbox, z = me.zIndex,
+ markerConfig, label, mask,
+ radius, toggle = false,
+ seriesStyle = Ext.apply(series.seriesStyle, series.style);
+
+ function getSeriesProp(name) {
+ var val = series[name];
+ return (Ext.isArray(val) ? val[idx] : val);
+ }
+
+ label = me.add('label', surface.add({
+ type: 'text',
+ x: 20,
+ y: 0,
+ zIndex: z || 0,
+ font: legend.labelFont,
+ text: getSeriesProp('title') || getSeriesProp('yField')
+ }));
+
+ // Line series - display as short line with optional marker in the middle
+ if (seriesType === 'line' || seriesType === 'scatter') {
+ if(seriesType === 'line') {
+ me.add('line', surface.add({
+ type: 'path',
+ path: 'M0.5,0.5L16.5,0.5',
+ zIndex: z,
+ "stroke-width": series.lineWidth,
+ "stroke-linejoin": "round",
+ "stroke-dasharray": series.dash,
+ stroke: seriesStyle.stroke || '#000',
+ style: {
+ cursor: 'pointer'
+ }
+ }));
+ }
+ if (series.showMarkers || seriesType === 'scatter') {
+ markerConfig = Ext.apply(series.markerStyle, series.markerConfig || {});
+ me.add('marker', Ext.chart.Shape[markerConfig.type](surface, {
+ fill: markerConfig.fill,
+ x: 8.5,
+ y: 0.5,
+ zIndex: z,
+ radius: markerConfig.radius || markerConfig.size,
+ style: {
+ cursor: 'pointer'
+ }
+ }));
+ }
+ }
+ // All other series types - display as filled box
+ else {
+ me.add('box', surface.add({
+ type: 'rect',
+ zIndex: z,
+ x: 0,
+ y: 0,
+ width: 12,
+ height: 12,
+ fill: series.getLegendColor(index),
+ style: {
+ cursor: 'pointer'
+ }
+ }));
+ }
+
+ me.setAttributes({
+ hidden: false
+ }, true);
+
+ bbox = me.getBBox();
+
+ mask = me.add('mask', surface.add({
+ type: 'rect',
+ x: bbox.x,
+ y: bbox.y,
+ width: bbox.width || 20,
+ height: bbox.height || 20,
+ zIndex: (z || 0) + 1000,
+ fill: '#f00',
+ opacity: 0,
+ style: {
+ 'cursor': 'pointer'
+ }
+ }));
+
+ //add toggle listener
+ me.on('mouseover', function() {
+ label.setStyle({
+ 'font-weight': 'bold'
+ });
+ mask.setStyle({
+ 'cursor': 'pointer'
+ });
+ series._index = index;
+ series.highlightItem();
+ }, me);
+
+ me.on('mouseout', function() {
+ label.setStyle({
+ 'font-weight': 'normal'
+ });
+ series._index = index;
+ series.unHighlightItem();
+ }, me);
+
+ if (!series.visibleInLegend(index)) {
+ toggle = true;
+ label.setAttributes({
+ opacity: 0.5
+ }, true);
+ }
+
+ me.on('mousedown', function() {
+ if (!toggle) {
+ series.hideAll();
+ label.setAttributes({
+ opacity: 0.5
+ }, true);
+ } else {
+ series.showAll();
+ label.setAttributes({
+ opacity: 1
+ }, true);
+ }
+ toggle = !toggle;
+ }, me);
+ me.updatePosition({x:0, y:0}); //Relative to 0,0 at first so that the bbox is calculated correctly
+ },
+
+ /**
+ * Update the positions of all this item's sprites to match the root position
+ * of the legend box.
+ * @param {Object} relativeTo (optional) If specified, this object's 'x' and 'y' values will be used
+ * as the reference point for the relative positioning. Defaults to the Legend.
+ */
+ updatePosition: function(relativeTo) {
+ var me = this,
+ items = me.items,
+ ln = items.length,
+ i = 0,
+ item;
+ if (!relativeTo) {
+ relativeTo = me.legend;
+ }
+ for (; i < ln; i++) {
+ item = items[i];
+ switch (item.type) {
+ case 'text':
+ item.setAttributes({
+ x: 20 + relativeTo.x + me.x,
+ y: relativeTo.y + me.y
+ }, true);
+ break;
+ case 'rect':
+ item.setAttributes({
+ translate: {
+ x: relativeTo.x + me.x,
+ y: relativeTo.y + me.y - 6
+ }
+ }, true);
+ break;
+ default:
+ item.setAttributes({
+ translate: {
+ x: relativeTo.x + me.x,
+ y: relativeTo.y + me.y
+ }
+ }, true);
+ }
+ }
+ }
+});
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