WPF：在空白区域单击时，ListView 无法获得焦点

Question

ListView can only get focus when clicking on listview items. When clicking on blank area, which is also part of the listview, focus cannot be got.

Example:

      <Grid>
            <ListView x:Name="lv" 
                      GotFocus="Lv_OnGotFocus"
                      LostFocus="Lv_OnLostFocus"
                      MouseEnter="Lv_OnMouseEnter">
                <ListViewItem>Foo</ListViewItem>
                <ListViewItem>Bar</ListViewItem>
            </ListView>
        </Grid>

In code above I bind event handler to the listview not the listview item.

• When cursor moves in the blank area, Lv_OnMouseEnter handler is triggered, which indicate the blank area are also part of listview.
• When clicking in the blank area, Lv_OnGotFocus is not triggered. Focus not got.
• When clicking on any listview item, Lv_OnGotFocus is triggered. Focus got.
• It's even the SAME, when Lv_OnGotFocus handler was moved to outter Grid .

How to get focus when any part of listview is clicked?

WHY I need focus on blank area?

I'm implementing file Copy & Paste function in the listview, in which listview items bind to files on disk. Paste action is triggered by a PreviewKeyDown handler attached to the listview, in which Ctrl + V key press is checked.

If a folder is empty, the listview is empty. Thus PreviewKeyDown handler cannot be triggered, as the Lv_OnGotFocus handler, in a empty folder, Whereas copying file into empty folder meant to be work.

Answer 1

An easy workaround is to handle clicks:

<ListView PreviewMouseLeftButtonDown="ListView_PreviewMouseLeftButtonDown" ... />

to set focus

void ListView_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) =>
    (sender as ListBox)?.Focus();

Note: this will cause GotFocus to be called twice when clicking on normal items.