How to apply animation on ListBoxItem before removal?

Emon Haque 3,176

I've a Custom Control EditListBox:

public class EditListBox : ListBox
{
    static EditListBox()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(EditListBox), new FrameworkPropertyMetadata(typeof(EditListBox)));
    }
    protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e) 
    {
        switch (e.Action)
        {
            case NotifyCollectionChangedAction.Remove:
                var removedItem = e.OldItems[0];
                break;
        }
    }
}

and in Remove action I get the Removed Item. How to apply a ColorAnimation there on the removed item?

DaisyTian-1203 11,626

@Emon Haque How about using below code to implement the ColorAnimation:

case NotifyCollectionChangedAction.Remove:  
                    SolidColorBrush brush = new SolidColorBrush(Colors.Red);  
                    ColorAnimation animation = new ColorAnimation(Colors.Red, Colors.Blue, new Duration(TimeSpan.FromSeconds(5)));  
                    var removedItem = e.OldItems[0] as ListBoxItem;  
                    removedItem.Background = brush;  
                    animation.Completed += Animation_Completed;  
                    brush.BeginAnimation(SolidColorBrush.ColorProperty, animation);  
                    break;

Emon Haque 3,176 Reputation points

2020-10-27T07:12:46.363+00:00

@DaisyTian-MSFT, it becomes null:

Accepted answer

gekka 9,586 Reputation points MVP

2020-10-31T13:01:19.807+00:00

I put an answer code for this question to gist ,because posting it will be an error in the QnA system.
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1 person found this answer helpful.
Emon Haque 3,176 Reputation points

2020-11-01T02:08:52.74+00:00

it's more complex than I thought.
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How to apply animation on ListBoxItem before removal?

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