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+// Licensed to Cloudera, Inc. under one
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+// or more contributor license agreements. See the NOTICE file
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+// distributed with this work for additional information
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+// regarding copyright ownership. Cloudera, Inc. licenses this file
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+// to you under the Apache License, Version 2.0 (the
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+// "License"); you may not use this file except in compliance
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+// with the License. You may obtain a copy of the License at
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+//
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+// http://www.apache.org/licenses/LICENSE-2.0
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+//
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+// Unless required by applicable law or agreed to in writing, software
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+// distributed under the License is distributed on an "AS IS" BASIS,
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+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+// See the License for the specific language governing permissions and
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+// limitations under the License.
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+
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+nv.models.legend = function() {
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+ "use strict";
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+ //============================================================
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+ // Public Variables with Default Settings
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+ //------------------------------------------------------------
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+
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+ var margin = {top: 5, right: 0, bottom: 5, left: 0}
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+ , width = 400
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+ , height = 20
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+ , getKey = function(d) { return d.key }
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+ , color = nv.utils.defaultColor()
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+ , align = true
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+ , rightAlign = true
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+ , updateState = true //If true, legend will update data.disabled and trigger a 'stateChange' dispatch.
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+ , radioButtonMode = false //If true, clicking legend items will cause it to behave like a radio button. (only one can be selected at a time)
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+ , dispatch = d3.dispatch('legendClick', 'legendDblclick', 'legendMouseover', 'legendMouseout', 'stateChange')
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+ ;
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+
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+ //============================================================
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+
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+
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+ function chart(selection) {
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+ selection.each(function(data) {
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+ var availableWidth = width - margin.left - margin.right,
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+ container = d3.select(this);
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+
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+ //------------------------------------------------------------
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+ // Setup containers and skeleton of chart
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+
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+ var wrap = container.selectAll('g.nv-legend').data([data]);
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+ var gEnter = wrap.enter().append('g').attr('class', 'nvd3 nv-legend').append('g');
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+ var g = wrap.select('g');
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+
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+ wrap.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
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+
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+ //------------------------------------------------------------
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+
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+
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+ var series = g.selectAll('.nv-series')
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+ .data(function(d) { return d });
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+ var seriesEnter = series.enter().append('g').attr('class', 'nv-series')
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+ .on('mouseover', function(d,i) {
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+ dispatch.legendMouseover(d,i); //TODO: Make consistent with other event objects
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+ })
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+ .on('mouseout', function(d,i) {
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+ dispatch.legendMouseout(d,i);
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+ })
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+ .on('click', function(d,i) {
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+ dispatch.legendClick(d,i);
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+ if (updateState) {
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+ if (radioButtonMode) {
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+ //Radio button mode: set every series to disabled,
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+ // and enable the clicked series.
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+ data.forEach(function(series) { series.disabled = true});
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+ d.disabled = false;
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+ }
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+ else {
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+ d.disabled = !d.disabled;
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+ if (data.every(function(series) { return series.disabled})) {
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+ //the default behavior of NVD3 legends is, if every single series
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+ // is disabled, turn all series' back on.
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+ data.forEach(function(series) { series.disabled = false});
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+ }
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+ }
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+ dispatch.stateChange({
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+ disabled: data.map(function(d) { return !!d.disabled })
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+ });
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+ }
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+ })
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+ .on('dblclick', function(d,i) {
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+ dispatch.legendDblclick(d,i);
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+ if (updateState) {
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+ //the default behavior of NVD3 legends, when double clicking one,
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+ // is to set all other series' to false, and make the double clicked series enabled.
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+ data.forEach(function(series) {
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+ series.disabled = true;
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+ });
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+ d.disabled = false;
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+ dispatch.stateChange({
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+ disabled: data.map(function(d) { return !!d.disabled })
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+ });
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+ }
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+ });
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+ seriesEnter.append('circle')
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+ .style('stroke-width', 2)
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+ .attr('class','nv-legend-symbol')
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+ .attr('r', 5)
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+ .style('display', function(d){return d.checkbox?'none':'inline'});
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+
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+ seriesEnter.append('rect')
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+ .style('stroke-width', 2)
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+ .attr('class','nv-legend-symbol')
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+ .attr('width', 10)
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+ .attr('height', 10)
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+ .attr('transform', 'translate(-5,-5)')
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+ .style('display', function(d){return d.checkbox?'inline':'none'});
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+
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+ seriesEnter.append('text')
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+ .attr('text-anchor', 'start')
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+ .attr('class','nv-legend-text')
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+ .attr('dy', '.32em')
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+ .attr('dx', '8');
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+ series.classed('disabled', function(d) { return d.disabled });
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+ series.exit().remove();
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+ series.select('circle')
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+ .style('fill', function(d,i) { return d.color || color(d,i)})
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+ .style('stroke', function(d,i) { return d.color || color(d, i) });
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+ series.select('rect')
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+ .style('fill', function(d,i) { return d.color || color(d,i)})
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+ .style('stroke', function(d,i) { return d.color || color(d, i) });
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+ series.select('text').text(getKey);
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+
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+
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+ //TODO: implement fixed-width and max-width options (max-width is especially useful with the align option)
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+
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+ // NEW ALIGNING CODE, TODO: clean up
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+ if (align) {
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+
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+ var seriesWidths = [];
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+ series.each(function(d,i) {
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+ var legendText = d3.select(this).select('text');
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+ var nodeTextLength;
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+ try {
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+ nodeTextLength = legendText.getComputedTextLength();
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+ // If the legendText is display:none'd (nodeTextLength == 0), simulate an error so we approximate, instead
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+ if(nodeTextLength <= 0) throw Error();
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+ }
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+ catch(e) {
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+ nodeTextLength = nv.utils.calcApproxTextWidth(legendText);
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+ }
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+
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+ seriesWidths.push(nodeTextLength + 28); // 28 is ~ the width of the circle plus some padding
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+ });
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+
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+ var seriesPerRow = 0;
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+ var legendWidth = 0;
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+ var columnWidths = [];
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+
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+ while ( legendWidth < availableWidth && seriesPerRow < seriesWidths.length) {
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+ columnWidths[seriesPerRow] = seriesWidths[seriesPerRow];
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+ legendWidth += seriesWidths[seriesPerRow++];
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+ }
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+ if (seriesPerRow === 0) seriesPerRow = 1; //minimum of one series per row
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+
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+
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+ while ( legendWidth > availableWidth && seriesPerRow > 1 ) {
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+ columnWidths = [];
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+ seriesPerRow--;
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+
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+ for (var k = 0; k < seriesWidths.length; k++) {
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+ if (seriesWidths[k] > (columnWidths[k % seriesPerRow] || 0) )
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+ columnWidths[k % seriesPerRow] = seriesWidths[k];
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+ }
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+
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+ legendWidth = columnWidths.reduce(function(prev, cur, index, array) {
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+ return prev + cur;
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+ });
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+ }
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+
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+ var xPositions = [];
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+ for (var i = 0, curX = 0; i < seriesPerRow; i++) {
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+ xPositions[i] = curX;
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+ curX += columnWidths[i];
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+ }
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+
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+ series
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+ .attr('transform', function(d, i) {
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+ return 'translate(' + xPositions[i % seriesPerRow] + ',' + (5 + Math.floor(i / seriesPerRow) * 20) + ')';
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+ });
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+
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+ //position legend as far right as possible within the total width
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+ if (rightAlign) {
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+ g.attr('transform', 'translate(' + (width - margin.right - legendWidth) + ',' + margin.top + ')');
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+ }
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+ else {
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+ g.attr('transform', 'translate(0' + ',' + margin.top + ')');
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+ }
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+
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+ height = margin.top + margin.bottom + (Math.ceil(seriesWidths.length / seriesPerRow) * 20);
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+
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+ } else {
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+
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+ var ypos = 5,
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+ newxpos = 5,
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+ maxwidth = 0,
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+ xpos;
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+ series
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+ .attr('transform', function(d, i) {
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+ var length = d3.select(this).select('text').node().getComputedTextLength() + 28;
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+ xpos = newxpos;
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+
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+ if (width < margin.left + margin.right + xpos + length) {
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+ newxpos = xpos = 5;
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+ ypos += 20;
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+ }
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+
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+ newxpos += length;
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+ if (newxpos > maxwidth) maxwidth = newxpos;
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+
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+ return 'translate(' + xpos + ',' + ypos + ')';
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+ });
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+
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+ //position legend as far right as possible within the total width
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+ g.attr('transform', 'translate(' + (width - margin.right - maxwidth) + ',' + margin.top + ')');
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+
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+ height = margin.top + margin.bottom + ypos + 15;
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+
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+ }
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+
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+ });
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+
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+ return chart;
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+ }
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+
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+
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+ //============================================================
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+ // Expose Public Variables
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+ //------------------------------------------------------------
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+
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+ chart.dispatch = dispatch;
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+ chart.options = nv.utils.optionsFunc.bind(chart);
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+
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+ chart.margin = function(_) {
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+ if (!arguments.length) return margin;
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+ margin.top = typeof _.top != 'undefined' ? _.top : margin.top;
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+ margin.right = typeof _.right != 'undefined' ? _.right : margin.right;
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+ margin.bottom = typeof _.bottom != 'undefined' ? _.bottom : margin.bottom;
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+ margin.left = typeof _.left != 'undefined' ? _.left : margin.left;
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+ return chart;
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+ };
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+
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+ chart.width = function(_) {
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+ if (!arguments.length) return width;
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+ width = _;
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+ return chart;
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+ };
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+
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+ chart.height = function(_) {
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+ if (!arguments.length) return height;
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+ height = _;
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+ return chart;
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+ };
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+
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+ chart.key = function(_) {
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+ if (!arguments.length) return getKey;
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+ getKey = _;
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+ return chart;
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+ };
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+
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+ chart.color = function(_) {
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+ if (!arguments.length) return color;
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+ color = nv.utils.getColor(_);
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+ return chart;
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+ };
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+
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+ chart.align = function(_) {
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+ if (!arguments.length) return align;
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+ align = _;
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+ return chart;
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+ };
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+
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+ chart.rightAlign = function(_) {
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+ if (!arguments.length) return rightAlign;
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+ rightAlign = _;
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+ return chart;
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+ };
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+
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+ chart.updateState = function(_) {
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+ if (!arguments.length) return updateState;
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+ updateState = _;
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+ return chart;
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+ };
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+
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+ chart.radioButtonMode = function(_) {
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+ if (!arguments.length) return radioButtonMode;
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+ radioButtonMode = _;
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+ return chart;
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+ };
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+
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+ //============================================================
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+
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+
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+ return chart;
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+}
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