CODEWITHSUNDEEP
c#wpflistbox
Skaranjit
Skaranjit

Reputation: 794

scroll to focused item in listbox dynamically

I have two list box in WPF which looks something like this:
enter image description here


Lets say, the left one is lbLeft and right one is lbRight.
The ">" button adds one selected item from lbLeft to lbRight. And, "<" removes the selected item form lbRight from the list.
The ">>" adds all the item from lbLeft to lbRight and "<<" clears lbRight. When I double click an item from lbLeft, it is added to the lbLeft and that newly added item is focused. Also, if i try to add an item from lbLeft which already exists in lbRight, it places a focus in that selected item(so that items are not repeated). But when lots of item are added in lbRight, I have to manually scroll down to the point where focus is placed. How can I make the scrolling of listbox automatic to the point where focus is placed?
I have done the following:

    private void select_Click(object sender, RoutedEventArgs e) // > button
    {
        addingItemToSelectedList();
    }

    private void remove_Click(object sender, RoutedEventArgs e) // < button
    {
        if (lbRight.SelectedItem != null) {
            lbRight.Items.RemoveAt(lbRight.SelectedIndex);
        }
    }

    private void selectall_Click(object sender, RoutedEventArgs e) // >> button
    {
        lbRight.Items.Clear();
        foreach (string item in column1) {
            lbRight.Items.Add(item);
        }

    }

private void lbLeft_MouseDoubleClick_1(object sender, MouseButtonEventArgs e)
    {
        addingItemToSelectedList();
    }
    private void addingItemToSelectedList() {
        if (lbLeft.SelectedItem != null)
        {
            string item = lbLeft.SelectedItem.ToString();
            addFocus(item);
        }
    }
    private void addFocus(string item) {
        if (!lbRight.Items.Contains(item))
        {
            lbRight.Items.Add(item);
            lbRight.SelectedIndex = lbRight.Items.Count - 1;
            lbRight.Focus();
        }
        else
        {
            int index = lbRight.Items.IndexOf(item);
            lbRight.SelectedIndex = index;
            lbRight.Focus();
        }
    }
    private void removeall_Click_1(object sender, RoutedEventArgs e) //<< button
    {
        lbRight.ItemsSource = null;
        lbRight.Items.Clear();
    }


column1 in the code is a list of items which populate lbLeft.
UPDATE:
I tried to use lbRight.ScrollIntoView(lbRight.SelectedIndex); But it has no effect

Upvotes: 2

Views: 1309

Answers (1)

Skaranjit
Skaranjit

Reputation: 794

ScrollIntoView() worked now. What i had to do was:
lbRight.ScrollIntoView(lbRight.Items[lbRight.SelectedIndex]);
It now passes the actual item rather than index of it.

Upvotes: 2

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