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define(function () {
var icon = {};
function changeColors(iconData, fillColor, strokeColor) {
var re;
if (fillColor) {
re = /(<!ENTITY fill_color ")(.*)(">)/;
iconData = iconData.replace(re, "$1" + fillColor + "$3");
}
if (strokeColor) {
re = /(<!ENTITY stroke_color ")(.*)(">)/;
iconData = iconData.replace(re, "$1" + strokeColor + "$3");
}
return iconData;
}
icon.load = function (iconInfo, callback) {
var source;
var dataHeader = "data:image/svg+xml,";
if ("uri" in iconInfo) {
source = iconInfo.uri;
} else if ("name" in iconInfo) {
source = "lib/graphics/icons/" + iconInfo.name + ".svg";
}
var fillColor = iconInfo.fillColor;
var strokeColor = iconInfo.strokeColor;
// If source is already a data uri, read it instead of doing
// the XMLHttpRequest
if (source.substring(0, 4) == 'data') {
var iconData = unescape(source.slice(dataHeader.length));
var newData = changeColors(iconData, fillColor, strokeColor);
callback(dataHeader + escape(newData));
return;
}
var client = new XMLHttpRequest();
client.onload = function () {
var iconData = this.responseText;
var newData = changeColors(iconData, fillColor, strokeColor);
callback(dataHeader + escape(newData));
};
client.open("GET", source);
client.send();
};
function getBackgroundURL(elem) {
var style = elem.currentStyle || window.getComputedStyle(elem, '');
// Remove prefix 'url(' and suffix ')' before return
return style.backgroundImage.slice(4, -1);
}
function setBackgroundURL(elem, url) {
elem.style.backgroundImage = "url('" + url + "')";
}
icon.colorize = function (elem, colors, callback) {
var iconInfo = {
"uri": getBackgroundURL(elem),
"strokeColor": colors.stroke,
"fillColor": colors.fill
};
icon.load(iconInfo, function (url) {
setBackgroundURL(elem, url);
if (callback) {
callback();
}
});
};
return icon;
});
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