public override object OnPreRender()
{
// build SVG start tag including SVG font
var buffer = new StringBuilder();
buffer.Append("<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" class=\"alphaTabWrapperSvg\">");
buffer.Append(SvgFontString.Value);
return buffer.ToString();
}
public override object OnPreRender()
{
// build SVG start tag including SVG font
var buffer = new StringBuilder();
buffer.Append("<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" class=\"alphaTabWrapperSvg\">");
buffer.Append(SvgFontString.Value);
return(buffer.ToString());
}
public static string GetNodeValue(XmlNode n)
{
if (n.NodeType == XmlNodeType.Element || n.NodeType == XmlNodeType.Document)
{
var txt = new StringBuilder();
foreach (XmlNode childNode in n.ChildNodes)
{
txt.Append(GetNodeValue(childNode));
}
return(txt.ToString().Trim());
}
return(n.Value);
}
static void PlatformInit()
{
RenderEngines["svg"] = () => new CssFontSvgCanvas();
RenderEngines["default"] = () => new CssFontSvgCanvas();
RenderEngines["html5"] = () => new Platform.JavaScript.Html5Canvas();
// check whether webfont is loaded
CheckFontLoad();
JsContext.JsCode("Math.log2 = Math.log2 || function(x) { return Math.log(x) * Math.LOG2E; };");
// try to build the find the alphaTab script url in case we are not in the webworker already
if (HtmlContext.self.document.As <bool>())
{
/**
* VB Loader For IE
* This code is based on the code of
* http://nagoon97.com/reading-binary-files-using-ajax/
* Copyright (c) 2008 Andy G.P. Na <*****@*****.**>
* The source code is freely distributable under the terms of an MIT-style license.
*/
var vbAjaxLoader = new StringBuilder();
vbAjaxLoader.AppendLine("<script type=\"text/vbscript\">");
vbAjaxLoader.AppendLine("Function VbAjaxLoader(method, fileName)");
vbAjaxLoader.AppendLine(" Dim xhr");
vbAjaxLoader.AppendLine(" Set xhr = CreateObject(\"Microsoft.XMLHTTP\")");
vbAjaxLoader.AppendLine(" xhr.Open method, fileName, False");
vbAjaxLoader.AppendLine(" xhr.setRequestHeader \"Accept-Charset\", \"x-user-defined\"");
vbAjaxLoader.AppendLine(" xhr.send");
vbAjaxLoader.AppendLine(" Dim byteArray()");
vbAjaxLoader.AppendLine(" if xhr.Status = 200 Then");
vbAjaxLoader.AppendLine(" Dim byteString");
vbAjaxLoader.AppendLine(" Dim i");
vbAjaxLoader.AppendLine(" byteString=xhr.responseBody");
vbAjaxLoader.AppendLine(" ReDim byteArray(LenB(byteString))");
vbAjaxLoader.AppendLine(" For i = 1 To LenB(byteString)");
vbAjaxLoader.AppendLine(" byteArray(i-1) = AscB(MidB(byteString, i, 1))");
vbAjaxLoader.AppendLine(" Next");
vbAjaxLoader.AppendLine(" End If");
vbAjaxLoader.AppendLine(" VbAjaxLoader=byteArray");
vbAjaxLoader.AppendLine("End Function");
vbAjaxLoader.AppendLine("</script>");
HtmlContext.document.write(vbAjaxLoader.ToString());
var scriptElement = HtmlContext.document.Member("currentScript").As <HtmlScriptElement>();
if (!scriptElement.As <bool>())
{
// try to get javascript from exception stack
try
{
var error = new JsError();
var stack = error.Member("stack");
if (!stack.As <bool>())
{
throw error;
}
ScriptFile = ScriptFileFromStack(stack.As <JsString>());
}
catch (JsError e)
{
var stack = e.Member("stack");
if (!stack.As <bool>())
{
scriptElement =
HtmlContext.document.querySelector("script[data-alphatab]").As <HtmlScriptElement>();
}
else
{
ScriptFile = ScriptFileFromStack(stack.As <JsString>());
}
}
}
// failed to automatically resolve
if (string.IsNullOrEmpty(ScriptFile))
{
if (!scriptElement.As <bool>())
{
HtmlContext.console.warn(
"Could not automatically find alphaTab script file for worker, please add the data-alphatab attribute to the script tag that includes alphaTab or provide it when initializing alphaTab");
}
else
{
ScriptFile = scriptElement.src;
}
}
}
}
