private static void Update(FrameworkElement target) {
var layer = AdornerLayer.GetAdornerLayer(target);
if (layer == null) {
Dispatcher.CurrentDispatcher.BeginInvoke(new Action<FrameworkElement>(o => Update(o)), DispatcherPriority.Loaded, target);
return;
}
var text = GetText(target);
var show = GetShow(target);
var maskType = GetMaskType(target);
var template = GetContentControlTemplate(target);
var adorner = GetAdorner(target);
if (show) {
if (adorner == null) {
adorner = new BusyIndicatorAdorner(target) {
MaskType = maskType,
ContentControlTemplate = template,
Text = text
};
layer.Add(adorner);
SetAdorner(target, adorner);
} else {
adorner.MaskType = maskType;
adorner.ContentControlTemplate = template;
adorner.Text = text;
}
//adorner.Visibility = Visibility.Visible;
} else {
if (adorner != null) {
layer.Remove(adorner);
//如果不 Remove 并设置为 null, 在 使用AvalonDock的程序里，切换标签会使 adorner 的 Parent 丢失
//如果设置为 null ，会在再一次显示的时候，重建
//adorner.Visibility = Visibility.Collapsed;
SetAdorner(target, null);
}
}
}
public static void SetAdorner(FrameworkElement target, BusyIndicatorAdorner adorner) {
target.SetValue(AdornerProperty, adorner);
}