I've been doing some tests just this morning but I was unable to reproduce the problem. Maybe my sample does not reflect the same scenario:
<Grid
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ItemsControl ItemsSource="{Binding Responses}" Width="200" Height="200">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button Content="{Binding Text}" MinWidth="100" MinHeight="20"
MouseEnterBehaviour.MouseOverCommand="{Binding MouseOver}" MouseEnterBehaviour.MouseOverParam="Hey!"/>
<TextBlock Text="{Binding Over}" Margin="2,0,0,0" MinWidth="100" Background="DimGray"/>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
public class MouseEnterBehaviour : DependencyObject
{
public static DependencyProperty MouseOverCommandProperty = DependencyProperty.RegisterAttached(
"MouseOverCommand", typeof(ICommand), typeof(MouseEnterBehaviour),
new FrameworkPropertyMetadata(null, new PropertyChangedCallback(MouseOverChanged)));
public static void SetMouseOverCommand(DependencyObject target, ICommand value)
{
target.SetValue(MouseEnterBehaviour.MouseOverCommandProperty, value);
}
public static ICommand GetMouseOverCommand(DependencyObject target)
{
return (ICommand)target.GetValue(MouseEnterBehaviour.MouseOverCommandProperty);
}
private static void MouseOverChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
{
UIElement element = target as UIElement;
if (element != null)
{
if ((e.NewValue != null) && (e.OldValue == null))
{
Debug.Log("Registered to MouseEnter");
element.MouseEnter += element_MouseOver;
}
else if ((e.NewValue == null) && (e.OldValue != null))
{
Debug.Log("Unregistered to MouseEnter");
element.MouseEnter -= element_MouseOver;
}
}
}
public static DependencyProperty MouseOverParamProperty = DependencyProperty.RegisterAttached(
"MouseOverParam", typeof(string), typeof(MouseEnterBehaviour),
new FrameworkPropertyMetadata(string.Empty));
public static void SetMouseOverParam(DependencyObject target, string value)
{
target.SetValue(MouseEnterBehaviour.MouseOverParamProperty, value);
}
public static string GetMouseOverParam(DependencyObject target)
{
return (string)target.GetValue(MouseEnterBehaviour.MouseOverParamProperty);
}
static void element_MouseOver(object sender, MouseEventArgs e)
{
UIElement element = (UIElement)sender;
ICommand command = GetMouseOverCommand(element);
object param = GetMouseOverParam(element);
command.Execute(param);
}
}
public class ItemVM: Noesis.Samples.NotifyPropertyChangedBase
{
public string Text { get; set; }
public string Over { get; private set; }
public ICommand MouseOver { get; private set; }
public ItemVM()
{
MouseOver = new Noesis.Samples.DelegateCommand(OnMouseOver);
}
public void OnMouseOver(object param)
{
Over = (string)param;
OnPropertyChanged("Over");
Debug.Log("OnMouseOver called with param = " + Over);
}
}
public class PanelVM
{
public List<ItemVM> Responses { get; private set; }
public PanelVM() { Responses = new List<ItemVM>(); }
}
public class Test : MonoBehaviour
{
void Start()
{
var gui = GetComponent<NoesisGUIPanel>();
var content = gui.GetContent();
PanelVM vm = new PanelVM();
vm.Responses.Add(new ItemVM { Text = "Ok" });
vm.Responses.Add(new ItemVM { Text = "Maybe" });
vm.Responses.Add(new ItemVM { Text = "Not at all" });
vm.Responses.Add(new ItemVM { Text = "Bye" });
content.DataContext = vm;
}
}
You should add some log messages as I did to check what part is failing (hook to the MouseEnter event, execution of the command, view model property change...).
But it will be better if you can create a ticket in our bugtracker and attach your project, so I can debug it to see what is happening.
