| "use strict"; |
| Object.defineProperty(exports, "__esModule", { value: true }); |
| exports.FontMetrics = void 0; |
| var util_1 = require("../core/util"); |
| var SAMPLE_TEXT = 'Hidden Text'; |
| var FontMetrics = (function () { |
| function FontMetrics(document) { |
| this._data = {}; |
| this._document = document; |
| } |
| FontMetrics.prototype.parseMetrics = function (fontFamily, fontSize) { |
| var container = this._document.createElement('div'); |
| var img = this._document.createElement('img'); |
| var span = this._document.createElement('span'); |
| var body = this._document.body; |
| container.style.visibility = 'hidden'; |
| container.style.fontFamily = fontFamily; |
| container.style.fontSize = fontSize; |
| container.style.margin = '0'; |
| container.style.padding = '0'; |
| container.style.whiteSpace = 'nowrap'; |
| body.appendChild(container); |
| img.src = util_1.SMALL_IMAGE; |
| img.width = 1; |
| img.height = 1; |
| img.style.margin = '0'; |
| img.style.padding = '0'; |
| img.style.verticalAlign = 'baseline'; |
| span.style.fontFamily = fontFamily; |
| span.style.fontSize = fontSize; |
| span.style.margin = '0'; |
| span.style.padding = '0'; |
| span.appendChild(this._document.createTextNode(SAMPLE_TEXT)); |
| container.appendChild(span); |
| container.appendChild(img); |
| var baseline = img.offsetTop - span.offsetTop + 2; |
| container.removeChild(span); |
| container.appendChild(this._document.createTextNode(SAMPLE_TEXT)); |
| container.style.lineHeight = 'normal'; |
| img.style.verticalAlign = 'super'; |
| var middle = img.offsetTop - container.offsetTop + 2; |
| body.removeChild(container); |
| return { baseline: baseline, middle: middle }; |
| }; |
| FontMetrics.prototype.getMetrics = function (fontFamily, fontSize) { |
| var key = fontFamily + " " + fontSize; |
| if (typeof this._data[key] === 'undefined') { |
| this._data[key] = this.parseMetrics(fontFamily, fontSize); |
| } |
| return this._data[key]; |
| }; |
| return FontMetrics; |
| }()); |
| exports.FontMetrics = FontMetrics; |
| |
