private void FillChildren(StackPanel sp, int count, Eval.Environment.ValueEnvironment vEnv, Environment.TypeEnvironment tEnv)
{
if (count >= 0 && count < sp.Children.Count)
{
sp.Children.RemoveRange(count, sp.Children.Count - count);
}
else if (count > sp.Children.Count)
{
for (int i = sp.Children.Count; i < count; i++)
{
Action <VarAccessEventArgs> onVarAccess = (args) => args.SetVarInstance(i);
vEnv.VarAccess += onVarAccess;
tEnv.VarAccess += onVarAccess;
sp.Children.Add(Body.BuildForm(vEnv, tEnv));
vEnv.VarAccess -= onVarAccess;
tEnv.VarAccess -= onVarAccess;
}
}
}
public FrameworkElement BuildForm(IValueEnvironment vEnv, ITypeEnvironment tEnv)
{
IList <int> baseInstances = null;
//TODO: Make it so no casting is needed
Eval.Environment.ValueEnvironment vEnvExt = (Eval.Environment.ValueEnvironment)vEnv;
Environment.TypeEnvironment tEnvExt = (Environment.TypeEnvironment)tEnv;
//Need to execute the body atleast once to bring the variable into existance.
Action <VarAccessEventArgs> onVarAccess = (args) =>
{
baseInstances = args.Instances;
args.SetVarInstance(0);
};
vEnvExt.VarAccess += onVarAccess;
tEnvExt.VarAccess += onVarAccess;
Body.BuildForm(vEnv, tEnv);
vEnvExt.VarAccess -= onVarAccess;
tEnvExt.VarAccess -= onVarAccess;
StackPanel sp = new StackPanel();
ValueContainer value = Expression.Evaluate(vEnv);
value.ValueChanged += () =>
{
Action <VarAccessEventArgs> baseInstancesEvent = (args) => args.SetVarBaseInstances(baseInstances);
vEnvExt.VarAccess += baseInstancesEvent;
tEnvExt.VarAccess += baseInstancesEvent;
FillChildren(sp, Convert.ToInt32(value.Value), vEnvExt, tEnvExt);
vEnvExt.VarAccess -= baseInstancesEvent;
tEnvExt.VarAccess -= baseInstancesEvent;
};
FillChildren(sp, Convert.ToInt32(value.Value), vEnvExt, tEnvExt);
return(sp);
}