/// <inheritdoc/>
protected override void OnKeyDown(KeyboardDevice device, Key key, ModifierKeys modifiers, RoutedEventData data)
{
switch (key)
{
case Key.Space:
case Key.Return:
if (key == Key.Return && !GetValue <Boolean>(KeyboardNavigation.AcceptsReturnProperty))
{
break;
}
var listBoxItem = ItemsControlUtil.FindContainer <ListBoxItem>(this, data.OriginalSource);
if (listBoxItem != null)
{
HandleItemClicked(listBoxItem);
data.Handled = true;
}
break;
case Key.Left:
PART_ScrollViewer?.LineLeft();
data.Handled = true;
break;
case Key.Right:
PART_ScrollViewer?.LineRight();
data.Handled = true;
break;
case Key.Up:
if (SelectionMode == SelectionMode.Single)
{
MoveSelectedItem(FocusNavigationDirection.Up, modifiers);
}
data.Handled = true;
break;
case Key.Down:
if (SelectionMode == SelectionMode.Single)
{
MoveSelectedItem(FocusNavigationDirection.Down, modifiers);
}
data.Handled = true;
break;
case Key.Home:
var firstItem = ItemsControlUtil.GetFirstItem <ListBoxItem>(this, PART_ScrollViewer);
if (firstItem != null && firstItem.Focus())
{
HandleItemClickedAndScrollIntoView(firstItem);
}
data.Handled = true;
break;
case Key.End:
var lastItem = ItemsControlUtil.GetLastItem <ListBoxItem>(this, PART_ScrollViewer);
if (lastItem != null && lastItem.Focus())
{
HandleItemClickedAndScrollIntoView(lastItem);
}
data.Handled = true;
break;
case Key.PageUp:
var pageUpTarget = ItemsControlUtil.GetPageUpNext <ListBoxItem>(this, PART_ScrollViewer);
if (pageUpTarget != null && pageUpTarget.Focus())
{
HandleItemClickedAndScrollIntoView(pageUpTarget, false);
}
data.Handled = true;
break;
case Key.PageDown:
var pageDownTarget = ItemsControlUtil.GetPageDownNext <ListBoxItem>(this, PART_ScrollViewer);
if (pageDownTarget != null && pageDownTarget.Focus())
{
HandleItemClickedAndScrollIntoView(pageDownTarget, false);
}
data.Handled = true;
break;
}
base.OnKeyDown(device, key, modifiers, data);
}
/// <summary>
/// Handles <see cref="Keyboard.KeyDownEvent"/> when the drop down is open.
/// </summary>
private void OnKeyDown_DropDownOpen(KeyboardDevice device, Key key, ModifierKeys modifiers, RoutedEventData data)
{
switch (key)
{
case Key.Tab:
PerformTabNavigation(key, modifiers);
data.Handled = true;
break;
case Key.Escape:
IsDropDownOpen = false;
data.Handled = true;
break;
case Key.Return:
SelectFocusedItem();
IsDropDownOpen = false;
data.Handled = true;
break;
case Key.Up:
MoveItemFocus(-1);
data.Handled = true;
break;
case Key.Down:
MoveItemFocus(1);
data.Handled = true;
break;
case Key.PageUp:
var pageUpTarget = ItemsControlUtil.GetPageUpNext <ComboBoxItem>(this, PART_ScrollViewer);
if (pageUpTarget != null && pageUpTarget.Focus())
{
ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, pageUpTarget, false);
}
data.Handled = true;
break;
case Key.PageDown:
var pageDownTarget = ItemsControlUtil.GetPageDownNext <ComboBoxItem>(this, PART_ScrollViewer);
if (pageDownTarget != null && pageDownTarget.Focus())
{
ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, pageDownTarget, false);
}
data.Handled = true;
break;
case Key.Home:
var firstItem = ItemsControlUtil.GetFirstItem <ComboBoxItem>(this, PART_ScrollViewer);
if (firstItem != null && firstItem.Focus())
{
ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, firstItem);
}
data.Handled = true;
break;
case Key.End:
var lastItem = ItemsControlUtil.GetLastItem <ComboBoxItem>(this, PART_ScrollViewer);
if (lastItem != null && lastItem.Focus())
{
ItemsControlUtil.ScrollItemIntoView <ComboBoxItem>(this, PART_ScrollViewer, lastItem);
}
data.Handled = true;
break;
case Key.Left:
PART_ScrollViewer?.LineLeft();
data.Handled = true;
break;
case Key.Right:
PART_ScrollViewer?.LineRight();
data.Handled = true;
break;
}
}