instiki/public/svg-edit/editor/browser.js
2011-02-03 11:13:18 -06:00

153 lines
4.7 KiB
JavaScript

/**
* Package: svgedit.browser
*
* Licensed under the Apache License, Version 2
*
* Copyright(c) 2010 Jeff Schiller
* Copyright(c) 2010 Alexis Deveria
*/
// Dependencies:
// 1) jQuery (for $.alert())
var svgedit = svgedit || {};
(function() {
if (!svgedit.browser) {
svgedit.browser = {};
}
var supportsSvg_ = (function() {
return !!document.createElementNS && !!document.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGRect;
})();
svgedit.browser.supportsSvg = function() { return supportsSvg_; }
if(!svgedit.browser.supportsSvg()) {
window.location = "browser-not-supported.html";
}
else{
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;
var supportsSelectors_ = (function() {
return !!svg.querySelector;
})();
var supportsXpath_ = (function() {
return !!document.evaluate;
})();
// segList functions (for FF1.5 and 2.0)
var supportsPathReplaceItem_ = (function() {
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;
})();
var supportsPathInsertItemBefore_ = (function() {
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
var supportsTextCharPos_ = (function() {
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;
})();
var supportsPathBBox_ = (function() {
var svgcontent = document.createElementNS(svgns, 'svg');
document.documentElement.appendChild(svgcontent);
var path = document.createElementNS(svgns, 'path');
path.setAttribute('d','M0,0 C0,0 10,10 10,0');
svgcontent.appendChild(path);
var bbox = path.getBBox();
document.documentElement.removeChild(svgcontent);
return (bbox.height > 4 && bbox.height < 5);
})();
var supportsEditableText_ = (function() {
// TODO: Find better way to check support for this
return isOpera_;
})();
var supportsGoodDecimals_ = (function() {
// 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;
})();
var supportsNonScalingStroke_ = (function() {
var rect = document.createElementNS(svgns, 'rect');
rect.setAttribute('style','vector-effect:non-scaling-stroke');
return rect.style.vectorEffect === 'non-scaling-stroke';
})();
var supportsNativeSVGTransformLists_ = (function() {
var rect = document.createElementNS(svgns, 'rect');
var rxform = rect.transform.baseVal;
var t1 = svg.createSVGTransform();
rxform.appendItem(t1);
return rxform.getItem(0) == t1;
})();
// Public API
svgedit.browser.isOpera = function() { return isOpera_; }
svgedit.browser.isWebkit = function() { return isWebkit_; }
svgedit.browser.isGecko = function() { return isGecko_; }
svgedit.browser.supportsSelectors = function() { return supportsSelectors_; }
svgedit.browser.supportsXpath = function() { return supportsXpath_; }
svgedit.browser.supportsPathReplaceItem = function() { return supportsPathReplaceItem_; }
svgedit.browser.supportsPathInsertItemBefore = function() { return supportsPathInsertItemBefore_; }
svgedit.browser.supportsPathBBox = function() { return supportsPathBBox_; }
svgedit.browser.supportsTextCharPos = function() { return supportsTextCharPos_; }
svgedit.browser.supportsEditableText = function() { return supportsEditableText_; }
svgedit.browser.supportsGoodDecimals = function() { return supportsGoodDecimals_; }
svgedit.browser.supportsNonScalingStroke = function() { return supportsNonScalingStroke_; }
svgedit.browser.supportsNativeTransformLists = function() { return supportsNativeSVGTransformLists_; }
}
})();