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4cd176a439ea516368a5d8827cdf8726027259a6
CPE_learningsite / CPE / CPE.App / CPE.App.Web / static / js / detect-zoom.js
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// detect-zoom is dual-licensed under the WTFPL and MIT license, // at the recipient's choice. // https://github.com/yonran/detect-zoom/ var DetectZoom = { mediaQueryBinarySearch: function ( property, unit, a, b, maxIter, epsilon) { var matchMedia; var head, style, div if (window.matchMedia) { matchMedia = window.matchMedia; } else { head = document.getElementsByTagName('head')[0]; style = document.createElement('style'); div = document.createElement('div'); div.className = 'mediaQueryBinarySearch'; head.appendChild(style); div.style.display = 'none'; document.body.appendChild(div); matchMedia = function (query) { style.sheet.insertRule('@media ' + query + '{.mediaQueryBinarySearch ' + '{text-decoration: underline} }', 0); var matched = getComputedStyle(div, null).textDecoration == 'underline'; style.sheet.deleteRule(0); return { matches: matched }; } } var r = binarySearch(a, b, maxIter); if (div) { head.removeChild(style); document.body.removeChild(div); } return r; function binarySearch(a, b, maxIter) { var mid = (a + b) / 2; if (maxIter == 0 || b - a < epsilon) return mid; var query = "(" + property + ":" + mid + unit + ")"; if (matchMedia(query).matches) { return binarySearch(mid, b, maxIter - 1); } else { return binarySearch(a, mid, maxIter - 1); } } }, _zoomIe7: function () { // the trick: body's offsetWidth was in CSS pixels, while // getBoundingClientRect() was in system pixels in IE7. // Thanks to http://help.dottoro.com/ljgshbne.php var rect = document.body.getBoundingClientRect(); var z = (rect.right - rect.left) / document.body.offsetWidth; z = Math.round(z * 100) / 100; return { zoom: z, devicePxPerCssPx: z }; }, _zoomIe8: function () { // IE 8+: no trick needed! // TODO: MSDN says that logicalXDPI and deviceXDPI existed since IE6 // (which didn't even have whole-page zoom). Check to see whether // this method would also work in IE7. var zoom = screen.deviceXDPI / screen.logicalXDPI; return { zoom: zoom, devicePxPerCssPx: zoom }; }, _zoomWebkitMobile: function () { // the trick: window.innerWIdth is in CSS pixels, while // screen.width and screen.height are in system pixels. // And there are no scrollbars to mess up the measurement. var devicePixelRatio = window.devicePixelRatio != null ? window.devicePixelRatio : 1 , deviceWidth; if (Math.abs(window.orientation) == 90) { deviceWidth = screen.height; } else { deviceWidth = screen.width; } var z = deviceWidth / window.innerWidth; // return immediately; don't round at the end. return { zoom: z, devicePxPerCssPx: z * devicePixelRatio }; }, _zoomWebkit: function () { // the trick: an element's clientHeight is in CSS pixels, while you can // set its line-height in system pixels using font-size and // -webkit-text-size-adjust:none. // device-pixel-ratio: http://www.webkit.org/blog/55/high-dpi-web-sites/ // Previous trick (used before http://trac.webkit.org/changeset/100847): // documentElement.scrollWidth is in CSS pixels, while // document.width was in system pixels. Note that this is the // layout width of the document, which is slightly different from viewport // because document width does not include scrollbars and might be wider // due to big elements. var devicePixelRatio = window.devicePixelRatio != null ? window.devicePixelRatio : 1; // The container exists so that the div will be laid out in its own flow // while not impacting the layout, viewport size, or display of the // webpage as a whole. var container = document.createElement('div') , div = document.createElement('div'); // Add !important and relevant CSS rule resets // so that other rules cannot affect the results. var important = function (str) { return str.replace(/;/g, " !important;"); }; container.setAttribute('style', important('width:0; height:0; overflow:hidden; visibility:hidden; position: absolute;')); div.innerHTML = "1<br>2<br>3<br>4<br>5<br>6<br>7<br>8<br>9<br>0"; div.setAttribute('style', important('font: 100px/1em sans-serif; -webkit-text-size-adjust: none; height: auto; width: 1em; padding: 0; overflow: visible;')); container.appendChild(div); document.body.appendChild(container); var z = 1000 / div.clientHeight; z = Math.round(z * 100) / 100; var r = { zoom: z, devicePxPerCssPx: devicePixelRatio * z }; document.body.removeChild(container); return r; }, _zoomFF35: function () { // the trick for FF3.5 ONLY: device-width gives CSS pixels, while // screen.width gave system pixels. Thanks to QuirksMode's widths table, // which called it a bug. http://www.quirksmode.org/m/widths.html var z = screen.width / this.mediaQueryBinarySearch('min-device-width', 'px', 0, 6000, 20, .0001); z = Math.round(z * 100) / 100; return { zoom: z, devicePxPerCssPx: z }; }, _zoomFF36: function () { // the hack for FF3.6: you can measure scrollbar's width in CSS pixels, // while in system pixels it's 15px (verified in Ubuntu). // TODO: verify for every platform that a scrollbar is exactly 15px wide. var container = document.createElement('div') , outerDiv = document.createElement('div'); // The container exists so that the div will be laid out in its own flow // while not impacting the layout, viewport size, or display of the // webpage as a whole. container.setAttribute('style', 'width:0; height:0; overflow:hidden;' + 'visibility:hidden; position: absolute'); outerDiv.style.width = outerDiv.style.height = '500px'; // enough for all the scrollbars var div = outerDiv; for (var i = 0; i < 10; ++i) { var child = document.createElement('div'); child.style.overflowY = 'scroll'; div.appendChild(child); div = child; } container.appendChild(outerDiv); document.body.appendChild(container); var outerDivWidth = outerDiv.clientWidth; var innerDivWidth = div.clientWidth; var scrollbarWidthCss = (outerDivWidth - innerDivWidth) / 10; document.body.removeChild(container); var scrollbarWidthDevice = 15; // Mac and Linux: scrollbars are 15px wide if (-1 != navigator.platform.indexOf('Win')) { scrollbarWidthDevice = 17; } var z = scrollbarWidthDevice / scrollbarWidthCss; z = Math.round(z * 100) / 100; return { zoom: z, devicePxPerCssPx: z }; }, _zoomFF4: function () { // no real trick; device-pixel-ratio is the ratio of device dpi / css dpi. // (Note that this is a different interpretation than Webkit's device // pixel ratio, which is the ratio device dpi / system dpi). // TODO: is mozmm vs. mm promising? var z = this.mediaQueryBinarySearch( 'min--moz-device-pixel-ratio', '', 0, 10, 20, .0001); z = Math.round(z * 100) / 100; return { zoom: z, devicePxPerCssPx: z }; }, _zoomOperaOlder: function () { // 10.00 (or before) to 11.01: // the trick: a div with position:fixed;width:100%'s offsetWidth is the // viewport width in CSS pixels, while window.innerWidth was in system // pixels. Thanks to: // http://virtuelvis.com/2005/05/how-to-detect-zoom-level-in-opera/ // TODO: fix bug: when there is a scrollbar, fixed div does NOT // include the scrollbar, while window.outerWidth DOES. This causes the // calculation to be off by a few percent. var fixedDiv = document.createElement('div'); fixedDiv.style.position = 'fixed'; fixedDiv.style.width = '100%'; fixedDiv.style.height = '100%'; fixedDiv.style.top = fixedDiv.style.left = '0'; fixedDiv.style.visibility = 'hidden'; document.body.appendChild(fixedDiv); var z = window.innerWidth / fixedDiv.offsetWidth; document.body.removeChild(fixedDiv); return { zoom: z, devicePxPerCssPx: z }; }, _zoomOpera11: function () { // works starting Opera 11.11 // the trick: outerWidth is the viewport width including scrollbars in // system px, while innerWidth is the viewport width including scrollbars // in CSS px; var z = window.outerWidth / window.innerWidth; z = Math.round(z * 100) / 100; return { zoom: z, devicePxPerCssPx: z }; }, ratios: function () { var r; if (!isNaN(screen.logicalXDPI) && !isNaN(screen.systemXDPI)) { return this._zoomIe8(); } else if ('ontouchstart' in window && document.body.style.webkitTextSizeAdjust != null) { return this._zoomWebkitMobile(); } else if (document.body.style.webkitTextSizeAdjust != null) { // webkit return this._zoomWebkit(); } else if (-1 != navigator.userAgent.indexOf('Firefox/3.5')) { return this._zoomFF35(); } else if (-1 != navigator.userAgent.indexOf('Firefox/3.6')) { return this._zoomFF36(); } else if (-1 != navigator.appVersion.indexOf("MSIE 7.")) { return this._zoomIe7(); } else if (-1 != navigator.userAgent.indexOf('Opera')) { var versionIdx = navigator.userAgent.indexOf('Version/'); if (11.01 < parseFloat(navigator.userAgent.substr(versionIdx + 8))) return this._zoomOpera11(); else return this._zoomOperaOlder(); } else if (0.001 < (r = this._zoomFF4()).zoom) { return r; } else { return { zoom: 1, devicePxPerCssPx: 1 } } }, zoom: function () { return this.ratios().zoom; }, device: function () { return this.ratios().devicePxPerCssPx; } }; |
Commits for CPE_learningsiteCPE/CPE.App/CPE.App.Web/static/js/detect-zoom.js
Revision | Author | Commited | Message |
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4cd176 ... | v.shishlov | Fri 27 Aug, 2021 14:33:17 +0000 | initial commit |