async Task InvokeButtonAction(VM.Button vm)
{
var msgAttr = vm?.ActionAttributes.OfType <MessageAttribute>().SingleOrDefault();
var progAttr = vm?.ActionAttributes.OfType <ProgressAttribute>().SingleOrDefault();
var pars = vm.Method.GetParameters();
var hasProgPar = pars.SingleOrDefault(x => x.ParameterType == typeof(IMechaProgress)) != null;
var hasMsgPar = pars.SingleOrDefault(x => x.ParameterType == typeof(IMechaMessage)) != null;
var hasActionPar = pars.SingleOrDefault(x => x.ParameterType == typeof(IMechaAction)) != null;
var hasProg = hasProgPar || progAttr != null;
var hasMsg = hasMsgPar || msgAttr != null;
IMechaMessage msgDial = hasMsgPar ? new MessageDialog() : null;
async Task InvokeAction(IMechaProgress progDial)
{
var argl = new List <Tuple <Type, object> >();
if (hasProgPar)
{
argl.Add(Tuple.Create(typeof(IMechaProgress), (object)progDial));
}
if (hasMsgPar)
{
argl.Add(Tuple.Create(typeof(IMechaMessage), (object)msgDial));
}
if (hasActionPar)
{
argl.Add(Tuple.Create(typeof(IMechaAction), (object)new ButtonHandle(vm)));
}
var args = argl.Count > 0
? pars.Join(argl,
x => x.ParameterType,
x => x.Item1,
(x, y) => y.Item2).ToArray()
: null;
if (argl.Count > 0 && argl.Count != args.Length)
{
throw new Exception($"The '{vm.Method.Name}' method has unsupported parameters.");
}
if (vm.Method.ReturnType == typeof(Task))
{
await(Task) vm.Invoke(args);
}
else
{
vm.Invoke(args);
}
}
bool actionError = false;
if (hasProg)
{
var message = progAttr?.Message ?? "Please wait...";
var title = progAttr?.Title ?? "processing";
var progDial = await dialogs.ShowProgress(title, message, false);
try
{
await InvokeAction(progDial);
}
catch (Exception exception)
{
actionError = true;
if (progDial.IsOpen)
{
await progDial.CloseAsync();
}
await dialogs.ShowError("Error", exception.GetBaseException().Message);
}
if (progDial.IsOpen)
{
await progDial.CloseAsync();
}
}
else
{
try
{
await InvokeAction(null);
}
catch (Exception exception)
{
actionError = true;
await dialogs.ShowError("Error", exception.GetBaseException().Message);
}
}
if (hasMsg)
{
var message = msgAttr?.Message ?? "Finished.";
var title = msgAttr?.Title ?? "done";
if (!actionError)
{
await dialogs.ShowInfo(msgDial?.Title ?? title, msgDial?.Message ?? message);
}
}
}
public void DynamicMessage(IMechaMessage msg)
{
msg.Title = "Dynamic Message";
msg.Message = "Done at " + DateTime.Now.ToShortTimeString();
}
