C# 从装饰布局、装饰器或装饰控件访问装饰面板？

我试图添加一个简单的文本块作为对控件的崇拜。但我想把它放在我装饰好的控件上方

这是装饰创作（此代码中不存在此问题）：

我无法做到的是装饰的定位，在装饰的控制之上。我想用，它利用装饰板来做定位

但是，我还没有弄明白如何访问AdornerPanel对象以便应用此MSDN代码示例。。。无论是从我的装饰控件、装饰布局还是装饰器

我承认我不清楚AdornerPanel和AdornerLayout之间的WPF类层次结构

---

非常感谢您的帮助。

要移动装饰条，您必须覆盖ArrangeOverride方法并在那里调整新的装饰条位置

下面是一个简单的FrameworkElementAdorner示例

  public class FrameworkElementAdorner : Adorner
  {
    private FrameworkElement _child;

    public FrameworkElementAdorner(UIElement adornedElement)
      : base(adornedElement)
    {
    }

    protected override int VisualChildrenCount
    {
      get { return 1; }
    }

    public FrameworkElement Child
    {
      get { return _child; }
      set
      {
        if (_child != null)
        {
          RemoveVisualChild(_child);
        }
        _child = value;
        if (_child != null)
        {
          AddVisualChild(_child);
        }
      }
    }

    protected override Visual GetVisualChild(int index)
    {
      if (index != 0) throw new ArgumentOutOfRangeException();
      return _child;
    }

    protected override Size MeasureOverride(Size constraint)
    {
      _child.Measure(constraint);
      return _child.DesiredSize;
    }

    protected override Size ArrangeOverride(Size finalSize)
    {
      // Adjust your offset here:
      _child.Arrange(new Rect(new Point(-20, -20), finalSize));
      return new Size(_child.ActualWidth, _child.ActualHeight);
    }

用法：

  public class FrameworkElementAdorner : Adorner
  {
    private FrameworkElement _child;

    public FrameworkElementAdorner(UIElement adornedElement)
      : base(adornedElement)
    {
    }

    protected override int VisualChildrenCount
    {
      get { return 1; }
    }

    public FrameworkElement Child
    {
      get { return _child; }
      set
      {
        if (_child != null)
        {
          RemoveVisualChild(_child);
        }
        _child = value;
        if (_child != null)
        {
          AddVisualChild(_child);
        }
      }
    }

    protected override Visual GetVisualChild(int index)
    {
      if (index != 0) throw new ArgumentOutOfRangeException();
      return _child;
    }

    protected override Size MeasureOverride(Size constraint)
    {
      _child.Measure(constraint);
      return _child.DesiredSize;
    }

    protected override Size ArrangeOverride(Size finalSize)
    {
      // Adjust your offset here:
      _child.Arrange(new Rect(new Point(-20, -20), finalSize));
      return new Size(_child.ActualWidth, _child.ActualHeight);
    }

  TextBlock textBlockMarkTooltipContent = new TextBlock();
  textBlockMarkTooltipContent.Text = "Test Label Adorner";

  var adorner = new FrameworkElementAdorner(this)
  {
    Child = textBlockMarkTooltipContent
  };

public void AddLabelDecoration()
{
    AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this);

    TextBlock textBlockMarkTooltipContent = new TextBlock();
    textBlockMarkTooltipContent.Text = "Test Label Adorner";

    AdornerPanel labelAdornerAdornerPanel = new AdornerPanel();

    // add your TextBlock to AdornerPanel
    labelAdornerAdornerPanel.Children.Add(textBlockMarkTooltipContent);

    // set placements on AdornerPanel
    AdornerPlacementCollection placement = new AdornerPlacementCollection();
    placement.PositionRelativeToAdornerHeight(-1, 0);
    placement.PositionRelativeToAdornerWidth(1, 0);
    AdornerPanel.SetPlacements(labelAdornerAdornerPanel, placement);

    // create Adorner with AdornerPanel inside
    _labelAdornerMarkTooltipContentAdorner = new Adorner(this)
    {
        Child = labelAdornerAdornerPanel
    };

    adornerLayer.Add(_labelAdornerMarkTooltipContentAdorner);
}