105 lines
2.6 KiB
JavaScript
105 lines
2.6 KiB
JavaScript
/**
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* Package: svgedit.document
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*
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* Licensed under the Apache License, Version 2
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*
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* Copyright(c) 2010 Jeff Schiller
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*/
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/*
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TODOs:
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Phase 1:
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- migrate svgcanvas to using a Document object for its calls to getNextId() and getId()
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- migrate usages of randomizeIds() to proxy into the Document
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Phase 2:
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- migrate uniquifyElems into this module
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- migrate as many usages of svgcontent in svgcanvas to using a Document instance as possible
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*/
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// Dependencies:
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// 1) jQuery
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(function() {
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if (!window.svgedit) {
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window.svgedit = {};
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}
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if (!svgedit.document) {
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svgedit.document = {};
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}
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var svg_ns = "http://www.w3.org/2000/svg";
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var se_ns = "http://svg-edit.googlecode.com";
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/**
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* This class encapsulates the concept of a SVG-edit document.
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*
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* @param svgElem {SVGSVGElement} The SVG DOM Element that this JS object
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* encapsulates. If the svgElem has a se:nonce attribute on it, then
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* IDs will use the nonce as they are generated.
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* @param opt_idPrefix {String} The ID prefix to use. Defaults to "svg_"
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* if not specified.
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*/
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svgedit.document.Document = function(svgElem, opt_idPrefix) {
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if (!svgElem || !svgElem.tagName || !svgElem.namespaceURI ||
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svgElem.tagName != 'svg' || svgElem.namespaceURI != svg_ns) {
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throw "Error: svgedit.document.Document instance initialized without a <svg> element";
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}
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this.svgElem_ = svgElem;
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this.obj_num = 0;
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this.idPrefix = opt_idPrefix || "svg_";
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// Determine if the <svg> element has a nonce on it
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this.nonce_ = this.svgElem_.getAttributeNS(se_ns, 'nonce') || "";
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};
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svgedit.document.Document.prototype.getElem_ = function(id) {
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if(this.svgElem_.querySelector) {
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// querySelector lookup
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return this.svgElem_.querySelector('#'+id);
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} else {
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// jQuery lookup: twice as slow as xpath in FF
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return $(this.svgElem_).find('[id=' + id + ']')[0];
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}
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};
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svgedit.document.Document.prototype.getSvgElem = function() {
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return this.svgElem_;
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}
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svgedit.document.Document.prototype.getNonce = function() {
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return this.nonce_;
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};
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/**
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* Returns the latest object id as a string.
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* @return {String} The latest object Id.
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*/
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svgedit.document.Document.prototype.getId = function() {
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return this.nonce_ ?
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this.idPrefix + this.nonce_ +'_' + this.obj_num :
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this.idPrefix + this.obj_num;
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};
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/**
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* Returns the next object Id as a string.
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* @return {String} The next object Id to use.
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*/
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svgedit.document.Document.prototype.getNextId = function() {
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// always increment the obj_num every time we call getNextId()
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this.obj_num++;
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// ensure the ID does not exist
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var id = this.getId();
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while (this.getElem_(id)) {
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this.obj_num++;
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id = this.getId();
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}
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return id;
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};
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})();
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