public void ReleaseFocus(IFocusable target)
{
if (m_FocusedElement == null)
{
return;
}
if (m_FocusedElement.isDisabled || m_FocusedElement.isDestroyed)
{
m_FocusedElement = null;
focusableIndex = -1;
onFocusChanged?.Invoke(target);
return;
}
if (m_FocusedElement == (UIElement)target)
{
IFocusable focusable = (IFocusable)m_FocusedElement;
m_FocusedElement.style.ExitState(StyleState.Focused);
focusable.Blur();
// todo -- if focus handlers added via template invoke them
m_FocusedElement = null;
focusableIndex = -1;
onFocusChanged?.Invoke(target);
}
}
public bool RequestFocus(IFocusable target)
{
if (!(target is UIElement element && !element.isDisabled))
{
return(false);
}
// try focus the element early to see if they accept being focused.
if (!target.Focus())
{
return(false);
}
// todo -- if focus handlers added via template invoke them
if (m_FocusedElement != null)
{
if (m_FocusedElement == (UIElement)target)
{
return(true);
}
IFocusable focusable = (IFocusable)m_FocusedElement;
m_FocusedElement.style.ExitState(StyleState.Focused);
focusable.Blur();
onFocusChanged?.Invoke(target);
}
m_FocusedElement = (UIElement)target;
m_FocusedElement.style.EnterState(StyleState.Focused);
onFocusChanged?.Invoke(target);
focusableIndex = -1;
for (int i = 0; i < focusables.Count; i++)
{
if (focusables[i] == target)
{
focusableIndex = i;
return(true);
}
}
return(true);
}