Listbox selection

Question

Every time I move an item up or down a listBox he loses focus of the item.

I’m not always able to focus on the item.

For example, let’s assume my list has 200 items. Then I want to move the item that is in position 160 to 159, as soon as moved it loses the selection (focus) of it, in case you want to move from 159 to 158 I will have to click again on the item and select.

public void MoveItem(int direction)
{            
    if (listBox.SelectedItem == null || listBox.SelectedIndex < 0)
        return; 

    int newIndex = listBox.SelectedIndex + direction;

    if (newIndex < 0 || newIndex >= listBox.Items.Count)
        return; 

    object selected = listBox.SelectedItem;

    listBox.Items.Remove(selected);

    listBox.Items.Insert(newIndex, selected);     
}

Answer 1

I managed to solve the problem

listBox.Focus();
listBox.SelectedIndex = newIndex;

inserted at the end of the code the Focus to then select a new index.

Answer 2

After moving the item, place the same as the one selected through your index.

listBox.SelectedIndex = newIndex;

If you do not have access to the desired index, save it in a class variable.

Answer 3

You can use the listBox.SetSelected() to select the item back:

public void MoveItem(int direction)
{            
    if (listBox.SelectedItem == null || listBox.SelectedIndex < 0)
        return; 

    int newIndex = listBox.SelectedIndex + direction;

    if (newIndex < 0 || newIndex >= listBox.Items.Count)
        return; 

    object selected = listBox.SelectedItem;

    listBox.Items.Remove(selected);

    listBox.Items.Insert(newIndex, selected);

    listBox.SetSelected(newIndex, true); //Ta aqui o bixo
}

If you have any doubts, take a look at documentation.