public NumberNodeViewModel(object parentNode, NumberModel model)
: base(model)
{
_parentNode = parentNode;
Items = new ObservableCollection <NumberNodeViewModel>();
var converter = new LambdaValueConverter <IDraggable, NumberModel>(
d => (d is NumberViewModel) ? (d as NumberViewModel).Model : null,
nm => new NumberNodeViewModel(this, nm));
DragHelper = new LambdaDragHelper <NumberModel>(converter,
() => GetAllSubItems(true).Select(nvm => nvm.Model).ToList(),
nms => DragDropEffectsEx.Move,
(nms, eff) =>
{
if (parentNode is NumberNodeViewModel)
{
(parentNode as NumberNodeViewModel).Items.Remove(this);
}
else if (parentNode is NumberTreeViewModel)
{
(parentNode as NumberTreeViewModel).Items.Remove(this);
}
//foreach (var nm in nms)
// Items.Remove(new NumberNodeViewModel(this, nm));
}
);
DropHelper = new LambdaDropHelper <NumberModel>(converter,
(nms, eff) =>
{
foreach (var nm in nms)
{
if (Items.Any(ivm => ivm.Model.Equals(nm)))
{
return(QueryDropEffects.None);
}
}
return(QueryDropEffects.CreateNew(DragDropEffectsEx.Move));
},
(nms, eff) =>
{
foreach (var nm in nms)
{
Items.Add(new NumberNodeViewModel(this, nm));
}
return(DragDropEffectsEx.Move);
})
{
DisplayName = "Node " + model.Value.ToString()
};
}
public NumberListViewModel(string displayName)
{
Items = new ObservableCollection <NumberViewModel>();
//Convert from IDraggable (implemented by ViewModel)
//to Model (value transferred from dragsource to drop target).
var converter = new LambdaValueConverter <IDraggable, NumberModel>(
d => (d is NumberViewModel) ? (d as NumberViewModel).Model : null,
nm => new NumberViewModel(nm));
DragHelper = new LambdaDragHelper <NumberModel>(converter,
//GetModels()
() => Items.Where(nvm => nvm.IsSelected).Select(nvm => nvm.Model).ToList(),
nms => DragDropEffectsEx.Move, //OnQueryDrag(models)
(nms, eff) =>
{
//OnDropCompleted(models, dropEffect)
foreach (var nm in nms)
{
Items.Remove(new NumberViewModel(nm));
}
}
);
DropHelper = new LambdaDropHelper <NumberModel>(converter,
(nms, eff) =>
{
//OnQueryDrop(models, possibleEffects)
foreach (var nm in nms)
{
if (Items.Any(ivm => ivm.Model.Equals(nm)))
{
return(QueryDropEffects.None);
}
}
return(QueryDropEffects.CreateNew(DragDropEffectsEx.Move));
},
(nms, eff) =>
{
//OnDrop(models, possibleEffects)
foreach (var nm in nms)
{
Items.Add(new NumberViewModel(nm));
}
return(DragDropEffectsEx.Move);
})
{
DisplayName = displayName
};
}
public NumberTreeViewModel(string displayName)
{
Items = new ObservableCollection <NumberNodeViewModel>();
var converter = new LambdaValueConverter <IDraggable, NumberModel>(
d => (d is NumberViewModel) ? (d as NumberViewModel).Model : null,
nm => new NumberNodeViewModel(this, nm));
DragHelper = new LambdaDragHelper <NumberModel>(converter,
() => Items.Where(nvm => nvm.IsSelected).Select(nvm => nvm.Model).ToList(),
nms => DragDropEffectsEx.Move,
(nms, eff) =>
{
foreach (var nm in nms)
{
Items.Remove(new NumberNodeViewModel(this, nm));
}
}
);
DropHelper = new LambdaDropHelper <NumberModel>(converter,
(nms, eff) =>
{
foreach (var nm in nms)
{
if (Items.Any(ivm => ivm.Model.Equals(nm)))
{
return(QueryDropEffects.None);
}
}
return(QueryDropEffects.CreateNew(DragDropEffectsEx.Move));
},
(nms, eff) =>
{
foreach (var nm in nms)
{
Items.Add(new NumberNodeViewModel(this, nm));
}
return(DragDropEffectsEx.Move);
})
{
DisplayName = displayName
};
}
