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'use strict';
var defaults = require('../core/core.defaults');
var Element = require('../core/core.element');
var helpers = require('../helpers/index');
var layouts = require('../core/core.layouts');
var noop = helpers.noop;
defaults._set('global', {
title: {
display: false,
fontStyle: 'bold',
fullWidth: true,
padding: 10,
position: 'top',
text: '',
weight: 2000 // by default greater than legend (1000) to be above
}
});
/**
* IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
*/
var Title = Element.extend({
initialize: function(config) {
var me = this;
helpers.extend(me, config);
// Contains hit boxes for each dataset (in dataset order)
me.legendHitBoxes = [];
},
// These methods are ordered by lifecycle. Utilities then follow.
beforeUpdate: noop,
update: function(maxWidth, maxHeight, margins) {
var me = this;
// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
me.beforeUpdate();
// Absorb the master measurements
me.maxWidth = maxWidth;
me.maxHeight = maxHeight;
me.margins = margins;
// Dimensions
me.beforeSetDimensions();
me.setDimensions();
me.afterSetDimensions();
// Labels
me.beforeBuildLabels();
me.buildLabels();
me.afterBuildLabels();
// Fit
me.beforeFit();
me.fit();
me.afterFit();
//
me.afterUpdate();
return me.minSize;
},
afterUpdate: noop,
//
beforeSetDimensions: noop,
setDimensions: function() {
var me = this;
// Set the unconstrained dimension before label rotation
if (me.isHorizontal()) {
// Reset position before calculating rotation
me.width = me.maxWidth;
me.left = 0;
me.right = me.width;
} else {
me.height = me.maxHeight;
// Reset position before calculating rotation
me.top = 0;
me.bottom = me.height;
}
// Reset padding
me.paddingLeft = 0;
me.paddingTop = 0;
me.paddingRight = 0;
me.paddingBottom = 0;
// Reset minSize
me.minSize = {
width: 0,
height: 0
};
},
afterSetDimensions: noop,
//
beforeBuildLabels: noop,
buildLabels: noop,
afterBuildLabels: noop,
//
beforeFit: noop,
fit: function() {
var me = this;
var opts = me.options;
var display = opts.display;
var minSize = me.minSize;
var lineCount = helpers.isArray(opts.text) ? opts.text.length : 1;
var fontOpts = helpers.options._parseFont(opts);
var textSize = display ? (lineCount * fontOpts.lineHeight) + (opts.padding * 2) : 0;
if (me.isHorizontal()) {
minSize.width = me.maxWidth; // fill all the width
minSize.height = textSize;
} else {
minSize.width = textSize;
minSize.height = me.maxHeight; // fill all the height
}
me.width = minSize.width;
me.height = minSize.height;
},
afterFit: noop,
// Shared Methods
isHorizontal: function() {
var pos = this.options.position;
return pos === 'top' || pos === 'bottom';
},
// Actually draw the title block on the canvas
draw: function() {
var me = this;
var ctx = me.ctx;
var opts = me.options;
if (opts.display) {
var fontOpts = helpers.options._parseFont(opts);
var lineHeight = fontOpts.lineHeight;
var offset = lineHeight / 2 + opts.padding;
var rotation = 0;
var top = me.top;
var left = me.left;
var bottom = me.bottom;
var right = me.right;
var maxWidth, titleX, titleY;
ctx.fillStyle = helpers.valueOrDefault(opts.fontColor, defaults.global.defaultFontColor); // render in correct colour
ctx.font = fontOpts.string;
// Horizontal
if (me.isHorizontal()) {
titleX = left + ((right - left) / 2); // midpoint of the width
titleY = top + offset;
maxWidth = right - left;
} else {
titleX = opts.position === 'left' ? left + offset : right - offset;
titleY = top + ((bottom - top) / 2);
maxWidth = bottom - top;
rotation = Math.PI * (opts.position === 'left' ? -0.5 : 0.5);
}
ctx.save();
ctx.translate(titleX, titleY);
ctx.rotate(rotation);
ctx.textAlign = 'center';
ctx.textBaseline = 'middle';
var text = opts.text;
if (helpers.isArray(text)) {
var y = 0;
for (var i = 0; i < text.length; ++i) {
ctx.fillText(text[i], 0, y, maxWidth);
y += lineHeight;
}
} else {
ctx.fillText(text, 0, 0, maxWidth);
}
ctx.restore();
}
}
});
function createNewTitleBlockAndAttach(chart, titleOpts) {
var title = new Title({
ctx: chart.ctx,
options: titleOpts,
chart: chart
});
layouts.configure(chart, title, titleOpts);
layouts.addBox(chart, title);
chart.titleBlock = title;
}
module.exports = {
id: 'title',
/**
* Backward compatibility: since 2.1.5, the title is registered as a plugin, making
* Chart.Title obsolete. To avoid a breaking change, we export the Title as part of
* the plugin, which one will be re-exposed in the chart.js file.
* https://github.com/chartjs/Chart.js/pull/2640
* @private
*/
_element: Title,
beforeInit: function(chart) {
var titleOpts = chart.options.title;
if (titleOpts) {
createNewTitleBlockAndAttach(chart, titleOpts);
}
},
beforeUpdate: function(chart) {
var titleOpts = chart.options.title;
var titleBlock = chart.titleBlock;
if (titleOpts) {
helpers.mergeIf(titleOpts, defaults.global.title);
if (titleBlock) {
layouts.configure(chart, titleBlock, titleOpts);
titleBlock.options = titleOpts;
} else {
createNewTitleBlockAndAttach(chart, titleOpts);
}
} else if (titleBlock) {
layouts.removeBox(chart, titleBlock);
delete chart.titleBlock;
}
}
};