Caliburn Micro Listbox move item up or down

Question

I've built an UI following this example... and would like to add two buttons to re-order listbox selected item (Move up - Move Down) in the "There" list. Any ideas as to do this using Caliburn Micro?

Answer 1

You need to add a property for SelectedThereItem and bind it in ThereList:

XAML:

<ListBox x:Name="ThereList" SelectedItem="{Binding ThereSelectedItem}" ... />
<!-- Add buttons for ThereMoveUp and ThereMoveDown - use Caliburn naming convention -->
<Button x:Name="ThereMoveUp"/>
<Button x:Name="ThereMoveDown"/>

ViewModel:

private Person _thereSelectedItem;
public Person ThereSelectedItem
{
    get { return _thereSelectedItem; }
    set
    {
        _thereSelectedItem = value;
        NotifyOfPropertyChange(() => ThereSelectedItem);
        NotifyOfPropertyChange(() => CanThereMoveDown);
        NotifyOfPropertyChange(() => CanThereMoveUp); 
    }
}

// Add event method handlers for ThereMoveUp/Down
public bool CanThereMoveUp { get { return _thereSelectedItem != null; } }
public void ThereMoveUp
{
    // Logic to move up
}

public bool CanThereMoveDown { get { return _thereSelectedItem != null; } }
public void ThereMoveDown
{
    // Logic to move down
}