--- /dev/null
+nv.models.legend = function() {
+ "use strict";
+ //============================================================
+ // Public Variables with Default Settings
+ //------------------------------------------------------------
+
+ var margin = {top: 5, right: 0, bottom: 5, left: 0}
+ , width = 400
+ , height = 20
+ , getKey = function(d) { return d.key }
+ , color = nv.utils.defaultColor()
+ , align = true
+ , rightAlign = true
+ , updateState = true //If true, legend will update data.disabled and trigger a 'stateChange' dispatch.
+ , radioButtonMode = false //If true, clicking legend items will cause it to behave like a radio button. (only one can be selected at a time)
+ , dispatch = d3.dispatch('legendClick', 'legendDblclick', 'legendMouseover', 'legendMouseout', 'stateChange')
+ ;
+
+ //============================================================
+
+
+ function chart(selection) {
+ selection.each(function(data) {
+ var availableWidth = width - margin.left - margin.right,
+ container = d3.select(this);
+
+
+ //------------------------------------------------------------
+ // Setup containers and skeleton of chart
+
+ var wrap = container.selectAll('g.nv-legend').data([data]);
+ var gEnter = wrap.enter().append('g').attr('class', 'nvd3 nv-legend').append('g');
+ var g = wrap.select('g');
+
+ wrap.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
+
+ //------------------------------------------------------------
+
+
+ var series = g.selectAll('.nv-series')
+ .data(function(d) { return d });
+ var seriesEnter = series.enter().append('g').attr('class', 'nv-series')
+ .on('mouseover', function(d,i) {
+ dispatch.legendMouseover(d,i); //TODO: Make consistent with other event objects
+ })
+ .on('mouseout', function(d,i) {
+ dispatch.legendMouseout(d,i);
+ })
+ .on('click', function(d,i) {
+ dispatch.legendClick(d,i);
+ if (updateState) {
+ if (radioButtonMode) {
+ //Radio button mode: set every series to disabled,
+ // and enable the clicked series.
+ data.forEach(function(series) { series.disabled = true});
+ d.disabled = false;
+ }
+ else {
+ d.disabled = !d.disabled;
+ if (data.every(function(series) { return series.disabled})) {
+ //the default behavior of NVD3 legends is, if every single series
+ // is disabled, turn all series' back on.
+ data.forEach(function(series) { series.disabled = false});
+ }
+ }
+ dispatch.stateChange({
+ disabled: data.map(function(d) { return !!d.disabled })
+ });
+ }
+ })
+ .on('dblclick', function(d,i) {
+ dispatch.legendDblclick(d,i);
+ if (updateState) {
+ //the default behavior of NVD3 legends, when double clicking one,
+ // is to set all other series' to false, and make the double clicked series enabled.
+ data.forEach(function(series) {
+ series.disabled = true;
+ });
+ d.disabled = false;
+ dispatch.stateChange({
+ disabled: data.map(function(d) { return !!d.disabled })
+ });
+ }
+ });
+ seriesEnter.append('circle')
+ .style('stroke-width', 2)
+ .attr('class','nv-legend-symbol')
+ .attr('r', 5);
+ seriesEnter.append('text')
+ .attr('text-anchor', 'start')
+ .attr('class','nv-legend-text')
+ .attr('dy', '.32em')
+ .attr('dx', '8');
+ series.classed('disabled', function(d) { return d.disabled });
+ series.exit().remove();
+ series.select('circle')
+ .style('fill', function(d,i) { return d.color || color(d,i)})
+ .style('stroke', function(d,i) { return d.color || color(d, i) });
+ series.select('text').text(getKey);
+
+
+ //TODO: implement fixed-width and max-width options (max-width is especially useful with the align option)
+
+ // NEW ALIGNING CODE, TODO: clean up
+ if (align) {
+
+ var seriesWidths = [];
+ series.each(function(d,i) {
+ var legendText = d3.select(this).select('text');
+ var nodeTextLength;
+ try {
+ nodeTextLength = legendText.node().getComputedTextLength();
+ }
+ catch(e) {
+ nodeTextLength = nv.utils.calcApproxTextWidth(legendText);
+ }
+
+ seriesWidths.push(nodeTextLength + 28); // 28 is ~ the width of the circle plus some padding
+ });
+
+ var seriesPerRow = 0;
+ var legendWidth = 0;
+ var columnWidths = [];
+
+ while ( legendWidth < availableWidth && seriesPerRow < seriesWidths.length) {
+ columnWidths[seriesPerRow] = seriesWidths[seriesPerRow];
+ legendWidth += seriesWidths[seriesPerRow++];
+ }
+ if (seriesPerRow === 0) seriesPerRow = 1; //minimum of one series per row
+
+
+ while ( legendWidth > availableWidth && seriesPerRow > 1 ) {
+ columnWidths = [];
+ seriesPerRow--;
+
+ for (var k = 0; k < seriesWidths.length; k++) {
+ if (seriesWidths[k] > (columnWidths[k % seriesPerRow] || 0) )
+ columnWidths[k % seriesPerRow] = seriesWidths[k];
+ }
+
+ legendWidth = columnWidths.reduce(function(prev, cur, index, array) {
+ return prev + cur;
+ });
+ }
+
+ var xPositions = [];
+ for (var i = 0, curX = 0; i < seriesPerRow; i++) {
+ xPositions[i] = curX;
+ curX += columnWidths[i];
+ }
+
+ series
+ .attr('transform', function(d, i) {
+ return 'translate(' + xPositions[i % seriesPerRow] + ',' + (5 + Math.floor(i / seriesPerRow) * 20) + ')';
+ });
+
+ //position legend as far right as possible within the total width
+ if (rightAlign) {
+ g.attr('transform', 'translate(' + (width - margin.right - legendWidth) + ',' + margin.top + ')');
+ }
+ else {
+ g.attr('transform', 'translate(0' + ',' + margin.top + ')');
+ }
+
+ height = margin.top + margin.bottom + (Math.ceil(seriesWidths.length / seriesPerRow) * 20);
+
+ } else {
+
+ var ypos = 5,
+ newxpos = 5,
+ maxwidth = 0,
+ xpos;
+ series
+ .attr('transform', function(d, i) {
+ var length = d3.select(this).select('text').node().getComputedTextLength() + 28;
+ xpos = newxpos;
+
+ if (width < margin.left + margin.right + xpos + length) {
+ newxpos = xpos = 5;
+ ypos += 20;
+ }
+
+ newxpos += length;
+ if (newxpos > maxwidth) maxwidth = newxpos;
+
+ return 'translate(' + xpos + ',' + ypos + ')';
+ });
+
+ //position legend as far right as possible within the total width
+ g.attr('transform', 'translate(' + (width - margin.right - maxwidth) + ',' + margin.top + ')');
+
+ height = margin.top + margin.bottom + ypos + 15;
+
+ }
+
+ });
+
+ return chart;
+ }
+
+
+ //============================================================
+ // Expose Public Variables
+ //------------------------------------------------------------
+
+ chart.dispatch = dispatch;
+ chart.options = nv.utils.optionsFunc.bind(chart);
+
+ chart.margin = function(_) {
+ if (!arguments.length) return margin;
+ margin.top = typeof _.top != 'undefined' ? _.top : margin.top;
+ margin.right = typeof _.right != 'undefined' ? _.right : margin.right;
+ margin.bottom = typeof _.bottom != 'undefined' ? _.bottom : margin.bottom;
+ margin.left = typeof _.left != 'undefined' ? _.left : margin.left;
+ return chart;
+ };
+
+ chart.width = function(_) {
+ if (!arguments.length) return width;
+ width = _;
+ return chart;
+ };
+
+ chart.height = function(_) {
+ if (!arguments.length) return height;
+ height = _;
+ return chart;
+ };
+
+ chart.key = function(_) {
+ if (!arguments.length) return getKey;
+ getKey = _;
+ return chart;
+ };
+
+ chart.color = function(_) {
+ if (!arguments.length) return color;
+ color = nv.utils.getColor(_);
+ return chart;
+ };
+
+ chart.align = function(_) {
+ if (!arguments.length) return align;
+ align = _;
+ return chart;
+ };
+
+ chart.rightAlign = function(_) {
+ if (!arguments.length) return rightAlign;
+ rightAlign = _;
+ return chart;
+ };
+
+ chart.updateState = function(_) {
+ if (!arguments.length) return updateState;
+ updateState = _;
+ return chart;
+ };
+
+ chart.radioButtonMode = function(_) {
+ if (!arguments.length) return radioButtonMode;
+ radioButtonMode = _;
+ return chart;
+ };
+
+ //============================================================
+
+
+ return chart;
+}
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