/// <summary>
/// Generates an observable declaration that wraps a event.
/// </summary>
/// <param name="eventDetails">The details of the event to wrap.</param>
/// <param name="dataObjectName">The name of the item where the event is stored.</param>
/// <param name="prefix">A prefix to append to the name.</param>
/// <returns>The property declaration.</returns>
protected static PropertyDeclarationSyntax?GenerateEventWrapperObservable(IEventSymbol eventDetails, string dataObjectName, string?prefix)
{
prefix ??= string.Empty;
// Create "Observable.FromEvent" for our method.
var(expressionBody, observableEventArgType) = GenerateFromEventExpression(eventDetails, dataObjectName);
if (observableEventArgType == null || expressionBody == null)
{
return(null);
}
var modifiers = eventDetails.IsStatic
? new[] { SyntaxKind.PublicKeyword, SyntaxKind.StaticKeyword }
: new[] { SyntaxKind.PublicKeyword };
var attributes = RoslynHelpers.GenerateObsoleteAttributeList(eventDetails);
// Produces for static: public static global::System.IObservable<(argType1, argType2)> EventName => (contents of expression body)
// Produces for instance: public global::System.IObservable<(argType1, argType2)> EventName => (contents of expression body)
return(PropertyDeclaration(observableEventArgType, prefix + eventDetails.Name, attributes, modifiers, expressionBody, 2)
.WithLeadingTrivia(XmlSyntaxFactory.GenerateSummarySeeAlsoComment("Gets an observable which signals when the {0} event triggers.", eventDetails.ConvertToDocument()))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken)));
}