719 lines
22 KiB
JavaScript
719 lines
22 KiB
JavaScript
var BoundingRect = require("../core/BoundingRect");
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var imageHelper = require("../graphic/helper/image");
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var _util = require("../core/util");
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var getContext = _util.getContext;
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var extend = _util.extend;
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var retrieve2 = _util.retrieve2;
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var retrieve3 = _util.retrieve3;
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var trim = _util.trim;
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var textWidthCache = {};
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var textWidthCacheCounter = 0;
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var TEXT_CACHE_MAX = 5000;
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var STYLE_REG = /\{([a-zA-Z0-9_]+)\|([^}]*)\}/g;
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var DEFAULT_FONT = '12px sans-serif'; // Avoid assign to an exported variable, for transforming to cjs.
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var methods = {};
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function $override(name, fn) {
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methods[name] = fn;
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}
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/**
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* @public
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* @param {string} text
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* @param {string} font
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* @return {number} width
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*/
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function getWidth(text, font) {
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font = font || DEFAULT_FONT;
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var key = text + ':' + font;
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if (textWidthCache[key]) {
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return textWidthCache[key];
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}
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var textLines = (text + '').split('\n');
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var width = 0;
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for (var i = 0, l = textLines.length; i < l; i++) {
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// textContain.measureText may be overrided in SVG or VML
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width = Math.max(measureText(textLines[i], font).width, width);
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}
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if (textWidthCacheCounter > TEXT_CACHE_MAX) {
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textWidthCacheCounter = 0;
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textWidthCache = {};
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}
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textWidthCacheCounter++;
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textWidthCache[key] = width;
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return width;
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}
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/**
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* @public
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* @param {string} text
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* @param {string} font
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* @param {string} [textAlign='left']
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* @param {string} [textVerticalAlign='top']
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* @param {Array.<number>} [textPadding]
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* @param {Object} [rich]
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* @param {Object} [truncate]
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* @return {Object} {x, y, width, height, lineHeight}
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*/
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function getBoundingRect(text, font, textAlign, textVerticalAlign, textPadding, textLineHeight, rich, truncate) {
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return rich ? getRichTextRect(text, font, textAlign, textVerticalAlign, textPadding, textLineHeight, rich, truncate) : getPlainTextRect(text, font, textAlign, textVerticalAlign, textPadding, textLineHeight, truncate);
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}
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function getPlainTextRect(text, font, textAlign, textVerticalAlign, textPadding, textLineHeight, truncate) {
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var contentBlock = parsePlainText(text, font, textPadding, textLineHeight, truncate);
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var outerWidth = getWidth(text, font);
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if (textPadding) {
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outerWidth += textPadding[1] + textPadding[3];
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}
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var outerHeight = contentBlock.outerHeight;
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var x = adjustTextX(0, outerWidth, textAlign);
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var y = adjustTextY(0, outerHeight, textVerticalAlign);
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var rect = new BoundingRect(x, y, outerWidth, outerHeight);
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rect.lineHeight = contentBlock.lineHeight;
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return rect;
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}
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function getRichTextRect(text, font, textAlign, textVerticalAlign, textPadding, textLineHeight, rich, truncate) {
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var contentBlock = parseRichText(text, {
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rich: rich,
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truncate: truncate,
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font: font,
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textAlign: textAlign,
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textPadding: textPadding,
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textLineHeight: textLineHeight
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});
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var outerWidth = contentBlock.outerWidth;
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var outerHeight = contentBlock.outerHeight;
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var x = adjustTextX(0, outerWidth, textAlign);
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var y = adjustTextY(0, outerHeight, textVerticalAlign);
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return new BoundingRect(x, y, outerWidth, outerHeight);
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}
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/**
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* @public
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* @param {number} x
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* @param {number} width
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* @param {string} [textAlign='left']
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* @return {number} Adjusted x.
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*/
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function adjustTextX(x, width, textAlign) {
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// FIXME Right to left language
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if (textAlign === 'right') {
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x -= width;
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} else if (textAlign === 'center') {
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x -= width / 2;
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}
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return x;
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}
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/**
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* @public
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* @param {number} y
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* @param {number} height
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* @param {string} [textVerticalAlign='top']
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* @return {number} Adjusted y.
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*/
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function adjustTextY(y, height, textVerticalAlign) {
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if (textVerticalAlign === 'middle') {
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y -= height / 2;
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} else if (textVerticalAlign === 'bottom') {
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y -= height;
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}
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return y;
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}
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/**
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* Follow same interface to `Displayable.prototype.calculateTextPosition`.
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* @public
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* @param {Obejct} [out] Prepared out object. If not input, auto created in the method.
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* @param {module:zrender/graphic/Style} style where `textPosition` and `textDistance` are visited.
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* @param {Object} rect {x, y, width, height} Rect of the host elment, according to which the text positioned.
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* @return {Object} The input `out`. Set: {x, y, textAlign, textVerticalAlign}
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*/
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function calculateTextPosition(out, style, rect) {
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var textPosition = style.textPosition;
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var distance = style.textDistance;
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var x = rect.x;
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var y = rect.y;
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distance = distance || 0;
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var height = rect.height;
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var width = rect.width;
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var halfHeight = height / 2;
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var textAlign = 'left';
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var textVerticalAlign = 'top';
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switch (textPosition) {
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case 'left':
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x -= distance;
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y += halfHeight;
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textAlign = 'right';
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textVerticalAlign = 'middle';
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break;
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case 'right':
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x += distance + width;
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y += halfHeight;
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textVerticalAlign = 'middle';
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break;
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case 'top':
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x += width / 2;
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y -= distance;
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textAlign = 'center';
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textVerticalAlign = 'bottom';
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break;
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case 'bottom':
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x += width / 2;
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y += height + distance;
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textAlign = 'center';
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break;
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case 'inside':
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x += width / 2;
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y += halfHeight;
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textAlign = 'center';
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textVerticalAlign = 'middle';
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break;
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case 'insideLeft':
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x += distance;
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y += halfHeight;
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textVerticalAlign = 'middle';
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break;
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case 'insideRight':
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x += width - distance;
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y += halfHeight;
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textAlign = 'right';
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textVerticalAlign = 'middle';
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break;
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case 'insideTop':
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x += width / 2;
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y += distance;
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textAlign = 'center';
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break;
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case 'insideBottom':
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x += width / 2;
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y += height - distance;
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textAlign = 'center';
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textVerticalAlign = 'bottom';
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break;
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case 'insideTopLeft':
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x += distance;
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y += distance;
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break;
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case 'insideTopRight':
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x += width - distance;
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y += distance;
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textAlign = 'right';
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break;
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case 'insideBottomLeft':
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x += distance;
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y += height - distance;
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textVerticalAlign = 'bottom';
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break;
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case 'insideBottomRight':
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x += width - distance;
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y += height - distance;
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textAlign = 'right';
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textVerticalAlign = 'bottom';
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break;
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}
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out = out || {};
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out.x = x;
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out.y = y;
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out.textAlign = textAlign;
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out.textVerticalAlign = textVerticalAlign;
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return out;
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}
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/**
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* To be removed. But still do not remove in case that some one has imported it.
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* @deprecated
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* @public
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* @param {stirng} textPosition
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* @param {Object} rect {x, y, width, height}
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* @param {number} distance
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* @return {Object} {x, y, textAlign, textVerticalAlign}
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*/
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function adjustTextPositionOnRect(textPosition, rect, distance) {
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var dummyStyle = {
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textPosition: textPosition,
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textDistance: distance
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};
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return calculateTextPosition({}, dummyStyle, rect);
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}
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/**
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* Show ellipsis if overflow.
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*
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* @public
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* @param {string} text
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* @param {string} containerWidth
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* @param {string} font
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* @param {number} [ellipsis='...']
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* @param {Object} [options]
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* @param {number} [options.maxIterations=3]
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* @param {number} [options.minChar=0] If truncate result are less
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* then minChar, ellipsis will not show, which is
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* better for user hint in some cases.
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* @param {number} [options.placeholder=''] When all truncated, use the placeholder.
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* @return {string}
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*/
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function truncateText(text, containerWidth, font, ellipsis, options) {
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if (!containerWidth) {
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return '';
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}
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var textLines = (text + '').split('\n');
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options = prepareTruncateOptions(containerWidth, font, ellipsis, options); // FIXME
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// It is not appropriate that every line has '...' when truncate multiple lines.
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for (var i = 0, len = textLines.length; i < len; i++) {
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textLines[i] = truncateSingleLine(textLines[i], options);
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}
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return textLines.join('\n');
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}
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function prepareTruncateOptions(containerWidth, font, ellipsis, options) {
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options = extend({}, options);
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options.font = font;
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var ellipsis = retrieve2(ellipsis, '...');
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options.maxIterations = retrieve2(options.maxIterations, 2);
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var minChar = options.minChar = retrieve2(options.minChar, 0); // FIXME
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// Other languages?
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options.cnCharWidth = getWidth('国', font); // FIXME
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// Consider proportional font?
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var ascCharWidth = options.ascCharWidth = getWidth('a', font);
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options.placeholder = retrieve2(options.placeholder, ''); // Example 1: minChar: 3, text: 'asdfzxcv', truncate result: 'asdf', but not: 'a...'.
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// Example 2: minChar: 3, text: '维度', truncate result: '维', but not: '...'.
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var contentWidth = containerWidth = Math.max(0, containerWidth - 1); // Reserve some gap.
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for (var i = 0; i < minChar && contentWidth >= ascCharWidth; i++) {
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contentWidth -= ascCharWidth;
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}
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var ellipsisWidth = getWidth(ellipsis, font);
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if (ellipsisWidth > contentWidth) {
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ellipsis = '';
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ellipsisWidth = 0;
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}
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contentWidth = containerWidth - ellipsisWidth;
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options.ellipsis = ellipsis;
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options.ellipsisWidth = ellipsisWidth;
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options.contentWidth = contentWidth;
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options.containerWidth = containerWidth;
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return options;
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}
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function truncateSingleLine(textLine, options) {
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var containerWidth = options.containerWidth;
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var font = options.font;
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var contentWidth = options.contentWidth;
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if (!containerWidth) {
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return '';
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}
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var lineWidth = getWidth(textLine, font);
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if (lineWidth <= containerWidth) {
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return textLine;
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}
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for (var j = 0;; j++) {
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if (lineWidth <= contentWidth || j >= options.maxIterations) {
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textLine += options.ellipsis;
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break;
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}
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var subLength = j === 0 ? estimateLength(textLine, contentWidth, options.ascCharWidth, options.cnCharWidth) : lineWidth > 0 ? Math.floor(textLine.length * contentWidth / lineWidth) : 0;
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textLine = textLine.substr(0, subLength);
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lineWidth = getWidth(textLine, font);
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}
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if (textLine === '') {
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textLine = options.placeholder;
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}
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return textLine;
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}
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function estimateLength(text, contentWidth, ascCharWidth, cnCharWidth) {
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var width = 0;
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var i = 0;
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for (var len = text.length; i < len && width < contentWidth; i++) {
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var charCode = text.charCodeAt(i);
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width += 0 <= charCode && charCode <= 127 ? ascCharWidth : cnCharWidth;
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}
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return i;
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}
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/**
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* @public
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* @param {string} font
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* @return {number} line height
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*/
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function getLineHeight(font) {
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// FIXME A rough approach.
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return getWidth('国', font);
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}
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/**
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* @public
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* @param {string} text
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* @param {string} font
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* @return {Object} width
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*/
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function measureText(text, font) {
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return methods.measureText(text, font);
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} // Avoid assign to an exported variable, for transforming to cjs.
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methods.measureText = function (text, font) {
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var ctx = getContext();
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ctx.font = font || DEFAULT_FONT;
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return ctx.measureText(text);
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};
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/**
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* @public
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* @param {string} text
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* @param {string} font
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* @param {Object} [truncate]
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* @return {Object} block: {lineHeight, lines, height, outerHeight, canCacheByTextString}
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* Notice: for performance, do not calculate outerWidth util needed.
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* `canCacheByTextString` means the result `lines` is only determined by the input `text`.
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* Thus we can simply comparing the `input` text to determin whether the result changed,
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* without travel the result `lines`.
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*/
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function parsePlainText(text, font, padding, textLineHeight, truncate) {
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text != null && (text += '');
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var lineHeight = retrieve2(textLineHeight, getLineHeight(font));
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var lines = text ? text.split('\n') : [];
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var height = lines.length * lineHeight;
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var outerHeight = height;
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var canCacheByTextString = true;
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if (padding) {
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outerHeight += padding[0] + padding[2];
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}
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if (text && truncate) {
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canCacheByTextString = false;
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var truncOuterHeight = truncate.outerHeight;
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var truncOuterWidth = truncate.outerWidth;
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if (truncOuterHeight != null && outerHeight > truncOuterHeight) {
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text = '';
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lines = [];
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} else if (truncOuterWidth != null) {
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var options = prepareTruncateOptions(truncOuterWidth - (padding ? padding[1] + padding[3] : 0), font, truncate.ellipsis, {
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minChar: truncate.minChar,
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placeholder: truncate.placeholder
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}); // FIXME
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// It is not appropriate that every line has '...' when truncate multiple lines.
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for (var i = 0, len = lines.length; i < len; i++) {
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lines[i] = truncateSingleLine(lines[i], options);
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}
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}
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}
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return {
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lines: lines,
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height: height,
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outerHeight: outerHeight,
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lineHeight: lineHeight,
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canCacheByTextString: canCacheByTextString
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};
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}
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/**
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* For example: 'some text {a|some text}other text{b|some text}xxx{c|}xxx'
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* Also consider 'bbbb{a|xxx\nzzz}xxxx\naaaa'.
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*
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* @public
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* @param {string} text
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* @param {Object} style
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* @return {Object} block
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* {
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* width,
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* height,
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* lines: [{
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* lineHeight,
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* width,
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* tokens: [[{
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* styleName,
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* text,
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* width, // include textPadding
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* height, // include textPadding
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* textWidth, // pure text width
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* textHeight, // pure text height
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* lineHeihgt,
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* font,
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* textAlign,
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* textVerticalAlign
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* }], [...], ...]
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* }, ...]
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* }
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* If styleName is undefined, it is plain text.
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*/
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function parseRichText(text, style) {
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var contentBlock = {
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lines: [],
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width: 0,
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height: 0
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};
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text != null && (text += '');
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if (!text) {
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return contentBlock;
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}
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var lastIndex = STYLE_REG.lastIndex = 0;
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var result;
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while ((result = STYLE_REG.exec(text)) != null) {
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var matchedIndex = result.index;
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if (matchedIndex > lastIndex) {
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pushTokens(contentBlock, text.substring(lastIndex, matchedIndex));
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}
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pushTokens(contentBlock, result[2], result[1]);
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lastIndex = STYLE_REG.lastIndex;
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}
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if (lastIndex < text.length) {
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pushTokens(contentBlock, text.substring(lastIndex, text.length));
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}
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var lines = contentBlock.lines;
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var contentHeight = 0;
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var contentWidth = 0; // For `textWidth: 100%`
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var pendingList = [];
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var stlPadding = style.textPadding;
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var truncate = style.truncate;
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var truncateWidth = truncate && truncate.outerWidth;
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var truncateHeight = truncate && truncate.outerHeight;
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if (stlPadding) {
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truncateWidth != null && (truncateWidth -= stlPadding[1] + stlPadding[3]);
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truncateHeight != null && (truncateHeight -= stlPadding[0] + stlPadding[2]);
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} // Calculate layout info of tokens.
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for (var i = 0; i < lines.length; i++) {
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var line = lines[i];
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var lineHeight = 0;
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var lineWidth = 0;
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for (var j = 0; j < line.tokens.length; j++) {
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var token = line.tokens[j];
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var tokenStyle = token.styleName && style.rich[token.styleName] || {}; // textPadding should not inherit from style.
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var textPadding = token.textPadding = tokenStyle.textPadding; // textFont has been asigned to font by `normalizeStyle`.
|
|
|
|
var font = token.font = tokenStyle.font || style.font; // textHeight can be used when textVerticalAlign is specified in token.
|
|
|
|
var tokenHeight = token.textHeight = retrieve2( // textHeight should not be inherited, consider it can be specified
|
|
// as box height of the block.
|
|
tokenStyle.textHeight, getLineHeight(font));
|
|
textPadding && (tokenHeight += textPadding[0] + textPadding[2]);
|
|
token.height = tokenHeight;
|
|
token.lineHeight = retrieve3(tokenStyle.textLineHeight, style.textLineHeight, tokenHeight);
|
|
token.textAlign = tokenStyle && tokenStyle.textAlign || style.textAlign;
|
|
token.textVerticalAlign = tokenStyle && tokenStyle.textVerticalAlign || 'middle';
|
|
|
|
if (truncateHeight != null && contentHeight + token.lineHeight > truncateHeight) {
|
|
return {
|
|
lines: [],
|
|
width: 0,
|
|
height: 0
|
|
};
|
|
}
|
|
|
|
token.textWidth = getWidth(token.text, font);
|
|
var tokenWidth = tokenStyle.textWidth;
|
|
var tokenWidthNotSpecified = tokenWidth == null || tokenWidth === 'auto'; // Percent width, can be `100%`, can be used in drawing separate
|
|
// line when box width is needed to be auto.
|
|
|
|
if (typeof tokenWidth === 'string' && tokenWidth.charAt(tokenWidth.length - 1) === '%') {
|
|
token.percentWidth = tokenWidth;
|
|
pendingList.push(token);
|
|
tokenWidth = 0; // Do not truncate in this case, because there is no user case
|
|
// and it is too complicated.
|
|
} else {
|
|
if (tokenWidthNotSpecified) {
|
|
tokenWidth = token.textWidth; // FIXME: If image is not loaded and textWidth is not specified, calling
|
|
// `getBoundingRect()` will not get correct result.
|
|
|
|
var textBackgroundColor = tokenStyle.textBackgroundColor;
|
|
var bgImg = textBackgroundColor && textBackgroundColor.image; // Use cases:
|
|
// (1) If image is not loaded, it will be loaded at render phase and call
|
|
// `dirty()` and `textBackgroundColor.image` will be replaced with the loaded
|
|
// image, and then the right size will be calculated here at the next tick.
|
|
// See `graphic/helper/text.js`.
|
|
// (2) If image loaded, and `textBackgroundColor.image` is image src string,
|
|
// use `imageHelper.findExistImage` to find cached image.
|
|
// `imageHelper.findExistImage` will always be called here before
|
|
// `imageHelper.createOrUpdateImage` in `graphic/helper/text.js#renderRichText`
|
|
// which ensures that image will not be rendered before correct size calcualted.
|
|
|
|
if (bgImg) {
|
|
bgImg = imageHelper.findExistImage(bgImg);
|
|
|
|
if (imageHelper.isImageReady(bgImg)) {
|
|
tokenWidth = Math.max(tokenWidth, bgImg.width * tokenHeight / bgImg.height);
|
|
}
|
|
}
|
|
}
|
|
|
|
var paddingW = textPadding ? textPadding[1] + textPadding[3] : 0;
|
|
tokenWidth += paddingW;
|
|
var remianTruncWidth = truncateWidth != null ? truncateWidth - lineWidth : null;
|
|
|
|
if (remianTruncWidth != null && remianTruncWidth < tokenWidth) {
|
|
if (!tokenWidthNotSpecified || remianTruncWidth < paddingW) {
|
|
token.text = '';
|
|
token.textWidth = tokenWidth = 0;
|
|
} else {
|
|
token.text = truncateText(token.text, remianTruncWidth - paddingW, font, truncate.ellipsis, {
|
|
minChar: truncate.minChar
|
|
});
|
|
token.textWidth = getWidth(token.text, font);
|
|
tokenWidth = token.textWidth + paddingW;
|
|
}
|
|
}
|
|
}
|
|
|
|
lineWidth += token.width = tokenWidth;
|
|
tokenStyle && (lineHeight = Math.max(lineHeight, token.lineHeight));
|
|
}
|
|
|
|
line.width = lineWidth;
|
|
line.lineHeight = lineHeight;
|
|
contentHeight += lineHeight;
|
|
contentWidth = Math.max(contentWidth, lineWidth);
|
|
}
|
|
|
|
contentBlock.outerWidth = contentBlock.width = retrieve2(style.textWidth, contentWidth);
|
|
contentBlock.outerHeight = contentBlock.height = retrieve2(style.textHeight, contentHeight);
|
|
|
|
if (stlPadding) {
|
|
contentBlock.outerWidth += stlPadding[1] + stlPadding[3];
|
|
contentBlock.outerHeight += stlPadding[0] + stlPadding[2];
|
|
}
|
|
|
|
for (var i = 0; i < pendingList.length; i++) {
|
|
var token = pendingList[i];
|
|
var percentWidth = token.percentWidth; // Should not base on outerWidth, because token can not be placed out of padding.
|
|
|
|
token.width = parseInt(percentWidth, 10) / 100 * contentWidth;
|
|
}
|
|
|
|
return contentBlock;
|
|
}
|
|
|
|
function pushTokens(block, str, styleName) {
|
|
var isEmptyStr = str === '';
|
|
var strs = str.split('\n');
|
|
var lines = block.lines;
|
|
|
|
for (var i = 0; i < strs.length; i++) {
|
|
var text = strs[i];
|
|
var token = {
|
|
styleName: styleName,
|
|
text: text,
|
|
isLineHolder: !text && !isEmptyStr
|
|
}; // The first token should be appended to the last line.
|
|
|
|
if (!i) {
|
|
var tokens = (lines[lines.length - 1] || (lines[0] = {
|
|
tokens: []
|
|
})).tokens; // Consider cases:
|
|
// (1) ''.split('\n') => ['', '\n', ''], the '' at the first item
|
|
// (which is a placeholder) should be replaced by new token.
|
|
// (2) A image backage, where token likes {a|}.
|
|
// (3) A redundant '' will affect textAlign in line.
|
|
// (4) tokens with the same tplName should not be merged, because
|
|
// they should be displayed in different box (with border and padding).
|
|
|
|
var tokensLen = tokens.length;
|
|
tokensLen === 1 && tokens[0].isLineHolder ? tokens[0] = token : // Consider text is '', only insert when it is the "lineHolder" or
|
|
// "emptyStr". Otherwise a redundant '' will affect textAlign in line.
|
|
(text || !tokensLen || isEmptyStr) && tokens.push(token);
|
|
} // Other tokens always start a new line.
|
|
else {
|
|
// If there is '', insert it as a placeholder.
|
|
lines.push({
|
|
tokens: [token]
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
function makeFont(style) {
|
|
// FIXME in node-canvas fontWeight is before fontStyle
|
|
// Use `fontSize` `fontFamily` to check whether font properties are defined.
|
|
var font = (style.fontSize || style.fontFamily) && [style.fontStyle, style.fontWeight, (style.fontSize || 12) + 'px', // If font properties are defined, `fontFamily` should not be ignored.
|
|
style.fontFamily || 'sans-serif'].join(' ');
|
|
return font && trim(font) || style.textFont || style.font;
|
|
}
|
|
|
|
exports.DEFAULT_FONT = DEFAULT_FONT;
|
|
exports.$override = $override;
|
|
exports.getWidth = getWidth;
|
|
exports.getBoundingRect = getBoundingRect;
|
|
exports.adjustTextX = adjustTextX;
|
|
exports.adjustTextY = adjustTextY;
|
|
exports.calculateTextPosition = calculateTextPosition;
|
|
exports.adjustTextPositionOnRect = adjustTextPositionOnRect;
|
|
exports.truncateText = truncateText;
|
|
exports.getLineHeight = getLineHeight;
|
|
exports.measureText = measureText;
|
|
exports.parsePlainText = parsePlainText;
|
|
exports.parseRichText = parseRichText;
|
|
exports.makeFont = makeFont; |