/// <summary>
/// Called when the submenu's <see cref="Popup"/> is opened.
/// </summary>
/// <param name="sender">The event sender.</param>
/// <param name="e">The event args.</param>
private void PopupOpened(object sender, EventArgs e)
{
var selected = SelectedIndex;
if (selected != -1)
{
var container = ItemContainerGenerator.ContainerFromIndex(selected);
container?.Focus();
}
}
private void OnDisplayMemberPathChanged(string oldPath, string newPath)
{
// refresh the display member template.
this.displayMemberTemplate = null;
var newTemplate = this.DisplayMemberTemplate;
int count = this.Items.Count;
for (int i = 0; i < count; i++)
{
this.UpdateContentTemplateOnContainer(ItemContainerGenerator.ContainerFromIndex(i), this.Items[i]);
}
}
private void UpdateSelectedContent()
{
if (SelectedIndex == -1)
{
SelectedContent = SelectedContentTemplate = null;
}
else
{
var container = SelectedItem as IContentControl ??
ItemContainerGenerator.ContainerFromIndex(SelectedIndex) as IContentControl;
SelectedContentTemplate = container?.ContentTemplate;
SelectedContent = container?.Content;
}
}
protected override void OnContainersMaterialized(ItemContainerEventArgs e)
{
base.OnContainersMaterialized(e);
if (SelectedContent != null || SelectedIndex == -1)
{
return;
}
var container = (TabItem)ItemContainerGenerator.ContainerFromIndex(SelectedIndex);
if (container == null)
{
return;
}
UpdateSelectedContent(container);
}
private void TryFocusSelectedItem()
{
var selectedIndex = SelectedIndex;
if (IsDropDownOpen && selectedIndex != -1)
{
var container = ItemContainerGenerator.ContainerFromIndex(selectedIndex);
if (container == null && SelectedIndex != -1)
{
ScrollIntoView(Selection.SelectedIndex);
container = ItemContainerGenerator.ContainerFromIndex(selectedIndex);
}
if (container != null && CanFocus(container))
{
container.Focus();
}
}
}
private void UpdateSelectedContent(AvaloniaPropertyChangedEventArgs e)
{
var index = (int)e.NewValue;
if (index == -1)
{
SelectedContentTemplate = null;
SelectedContent = null;
return;
}
var container = (TabItem)ItemContainerGenerator.ContainerFromIndex(index);
if (container == null)
{
return;
}
UpdateSelectedContent(container);
}
