private void HandleInstanceMemberBeforeSetByUi(object sender, EventArgs e)
{
if (BeforePropertyChange != null)
{
BeforePropertyChangedArgs args = (BeforePropertyChangedArgs)e;
args.Owner = this.Instance;
args.OldValue = ((InstanceMember)sender).Value;
args.PropertyName = ((InstanceMember)sender).Name;
BeforePropertyChange(((InstanceMember)sender).Name, args);
}
}
private void HandleBeforePropertyChange(string propertyName, BeforePropertyChangedArgs changeArgs)
{
if (propertyName == "Name")
{
// make sure this is a valid name, and if not, let's change it
string whyIsntValid;
var instance = ArrowState.Self.CurrentInstance;
var elementSave = ArrowState.Self.CurrentArrowElementSave;
NameVerifier.Self.IsInstanceNameValid(changeArgs.NewValue as string, out whyIsntValid, instance, elementSave);
if (!string.IsNullOrEmpty(whyIsntValid))
{
MessageBox.Show("Invalid name:\n" + whyIsntValid);
changeArgs.OverridingValue = changeArgs.OldValue;
}
}
}
internal void CallBeforeSetByUi(IDataUi dataUi)
{
if (BeforeSetByUi != null)
{
BeforePropertyChangedArgs args = new BeforePropertyChangedArgs();
object value;
dataUi.TryGetValueOnUi(out value);
args.NewValue = value;
BeforeSetByUi(this, args);
if (args.WasManuallySet)
{
// The event changed it, so let's force it back on the UI
dataUi.TrySetValueOnUi(args.OverridingValue);
}
}
}
