instiki/public/svg-edit/editor/browsersupport.js

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2010-12-01 06:23:58 +01:00
/**
* Package: svgedit.browsersupport
*
* Licensed under the Apache License, Version 2
*
* Copyright(c) 2010 Jeff Schiller
* Copyright(c) 2010 Alexis Deveria
*/
// Dependencies:
// 1) jQuery (for $.alert())
(function() {
if (!window.svgedit) {
window.svgedit = {};
}
if (!svgedit.browsersupport) {
svgedit.browsersupport = {};
}
var svgns = 'http://www.w3.org/2000/svg';
var userAgent = navigator.userAgent;
var svg = document.createElementNS(svgns, 'svg');
// Note: Browser sniffing should only be used if no other detection method is possible
var isOpera_ = !!window.opera;
var isWebkit_ = userAgent.indexOf("AppleWebKit") >= 0;
var isGecko_ = userAgent.indexOf('Gecko/') >= 0;
svgedit.browsersupport.isOpera = function() { return isOpera_; }
svgedit.browsersupport.isWebkit = function() { return isWebkit_; }
svgedit.browsersupport.isGecko = function() { return isGecko_; }
// segList functions (for FF1.5 and 2.0)
function supportPathReplaceItem() {
var path = document.createElementNS(svgns, 'path');
path.setAttribute('d','M0,0 10,10');
var seglist = path.pathSegList;
var seg = path.createSVGPathSegLinetoAbs(5,5);
try {
seglist.replaceItem(seg, 0);
return true;
} catch(err) {}
return false;
}
function supportPathInsertItemBefore() {
var path = document.createElementNS(svgns,'path');
path.setAttribute('d','M0,0 10,10');
var seglist = path.pathSegList;
var seg = path.createSVGPathSegLinetoAbs(5,5);
try {
seglist.insertItemBefore(seg, 0);
return true;
} catch(err) {}
return false;
}
// text character positioning
function supportTextCharPos() {
var retValue = false;
var svgcontent = document.createElementNS(svgns, 'svg');
document.documentElement.appendChild(svgcontent);
try {
var text = document.createElementNS(svgns,'text');
text.textContent = 'a';
svgcontent.appendChild(text);
text.getStartPositionOfChar(0);
retValue = true;
} catch(err) {}
document.documentElement.removeChild(svgcontent);
return retValue;
}
function supportEditableText() {
// TODO: Find better way to check support for this
return svgedit.browsersupport.isOpera();
}
function supportGoodDecimals() {
// Correct decimals on clone attributes (Opera < 10.5/win/non-en)
var rect = document.createElementNS(svgns, 'rect');
rect.setAttribute('x',.1);
var crect = rect.cloneNode(false);
var retValue = (crect.getAttribute('x').indexOf(',') == -1);
if(!retValue) {
$.alert("NOTE: This version of Opera is known to contain bugs in SVG-edit.\n\
Please upgrade to the <a href='http://opera.com'>latest version</a> in which the problems have been fixed.");
}
return retValue;
}
function supportNonScalingStroke() {
var rect = document.createElementNS(svgns, 'rect');
rect.setAttribute('style','vector-effect:non-scaling-stroke');
return rect.style.vectorEffect === 'non-scaling-stroke';
}
function supportNativeSVGTransformLists() {
var rect = document.createElementNS(svgns, 'rect');
var rxform = rect.transform.baseVal;
var t1 = svg.createSVGTransform();
rxform.appendItem(t1);
return rxform.getItem(0) == t1;
}
svgedit.browsersupport.pathReplaceItem = supportPathReplaceItem();
svgedit.browsersupport.pathInsertItemBefore = supportPathInsertItemBefore();
svgedit.browsersupport.textCharPos = supportTextCharPos();
svgedit.browsersupport.editableText = supportEditableText();
svgedit.browsersupport.goodDecimals = supportGoodDecimals();
svgedit.browsersupport.nonScalingStroke = supportNonScalingStroke();
svgedit.browsersupport.nativeTransformLists = supportNativeSVGTransformLists();
})();