/// <summary>
/// 设置焦点，若参数为null，则保持当前焦点位置
/// </summary>
/// <param name="target">设置的元素</param>
public void SetFlow(ComponentBase target)
{
if (target == null)
{
return;
}
target.UIInvoke(new Action(() =>
{
if (CurrentElement != null && target == CurrentElement)
{
return;
}
//若传入要素的焦点控制器与当前的不一致，则不执行跳转
var fm = FlowManager.GetManagerInstance(target);
if (fm != this)
{
return;
}
//直接跳转到目标元素
if (IsFlowable(target))
{
RaiseEnterEvent(target);
CurrentElement = target;
}
else if (CurrentElement == null)
{
ReSetFlow();
}
}));
}
void _target_Ready(object sender, EventArgs e)
{
_target.Loaded -= _target_Ready;
//检查上层是否存在开启焦点的控件，防止嵌套
if (_target.FindVisualTreeAncestor(x => FlowManager.GetIsFlowScope(x)) != null)
{
throw new NotSupportedException("上层已经开启焦点流程控制，系统不支持嵌套使用！目标:" + _target);
}
//如果区域的背景为空，会导致鼠标点击事件的穿透，影响控制效果
if (_target.GetValue(Control.BackgroundProperty) == null)
{
_target.SetValue(Control.BackgroundProperty, Brushes.Transparent);
}
FlowList = FlowList.Create(_target);
//foreach (var item in FlowList)
//{
// SetManagerInstance(item, this);
//}
//如果已经设置好焦点控件，则无须重置
if (CurrentElement == null)
{
this.MoveFocusHost(FlowNavigation.Top);
}
}
internal static void SetManagerInstance(DependencyObject d, FlowManager value)
{
d.SetValue(ManagerInstancePropertyKey, value);
}