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/**
* $Id: mxImageBundle.js,v 1.3 2011-01-20 19:08:11 gaudenz Exp $
* Copyright (c) 2006-2010, JGraph Ltd
*/
/**
* Class: mxImageBundle
*
* Maps from keys to base64 encoded images or file locations. All values must
* be URLs or use the format data:image/format followed by a comma and the base64
* encoded image data, eg. "data:image/gif,XYZ", where XYZ is the base64 encoded
* image data.
*
* To add a new image bundle to an existing graph, the following code is used:
*
* (code)
* var bundle = new mxImageBundle(alt);
* bundle.putImage('myImage', 'data:image/gif,R0lGODlhEAAQAMIGAAAAAICAAICAgP' +
* '//AOzp2O3r2////////yH+FUNyZWF0ZWQgd2l0aCBUaGUgR0lNUAAh+QQBCgAHACwAAAAA' +
* 'EAAQAAADTXi63AowynnAMDfjPUDlnAAJhmeBFxAEloliKltWmiYCQvfVr6lBPB1ggxN1hi' +
* 'laSSASFQpIV5HJBDyHpqK2ejVRm2AAgZCdmCGO9CIBADs=', fallback);
* graph.addImageBundle(bundle);
* (end);
*
* Alt is an optional boolean (default is false) that specifies if the value
* or the fallback should be returned in <getImage>.
*
* The image can then be referenced in any cell style using image=myImage.
* If you are using mxOutline, you should use the same image bundles in the
* graph that renders the outline.
*
* The keys for images are resolved in <mxGraph.postProcessCellStyle> and
* turned into a data URI if the returned value has a short data URI format
* as specified above.
*
* A typical value for the fallback is a MTHML link as defined in RFC 2557.
* Note that this format requires a file to be dynamically created on the
* server-side, or the page that contains the graph to be modified to contain
* the resources, this can be done by adding a comment that contains the
* resource in the HEAD section of the page after the title tag.
*
* This type of fallback mechanism should be used in IE6 and IE7. IE8 does
* support data URIs, but the maximum size is limited to 32 KB, which means
* all data URIs should be limited to 32 KB.
*/
function mxImageBundle(alt)
{
this.images = [];
this.alt = (alt != null) ? alt : false;
};
/**
* Variable: images
*
* Maps from keys to images.
*/
mxImageBundle.prototype.images = null;
/**
* Variable: alt
*
* Specifies if the fallback representation should be returned.
*/
mxImageBundle.prototype.images = null;
/**
* Function: putImage
*
* Adds the specified entry to the map. The entry is an object with a value and
* fallback property as specified in the arguments.
*/
mxImageBundle.prototype.putImage = function(key, value, fallback)
{
this.images[key] = {value: value, fallback: fallback};
};
/**
* Function: getImage
*
* Returns the value for the given key. This returns the value
* or fallback, depending on <alt>. The fallback is returned if
* <alt> is true, the value is returned otherwise.
*/
mxImageBundle.prototype.getImage = function(key)
{
var result = null;
if (key != null)
{
var img = this.images[key];
if (img != null)
{
result = (this.alt) ? img.fallback : img.value;
}
}
return result;
};
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