裝飾者，不能設置不透明度，邊框，背景wpf

Question

我有一個自定義的裝飾。 （其示出了圖像的同時拖動一個的UIElement）

現在，這種裝飾器是透明的，但我希望它是不透明的。 我也不知道如何設置它的背景和其他好看的東西 像一個邊框。

這是我的自定義裝飾器：

/// <summary> 
/// Adorner, to show a picture of the listbox-item we are dragging. 
/// </summary> 
public class DraggedAdorner : Adorner 
{ 
    private readonly ContentPresenter draggedItemPresenter; 
    private readonly AdornerLayer draggedItemAdornerLayer; 

    private double left; 
    private double top; 

    /// <summary> 
    /// Initializes a new adorner, which will display the dragged listbox-item. 
    /// </summary> 
    /// <param name="listBoxItem">ListBoxItem, which we want to show while dragging.</param> 
    /// <param name="listBox">ListBoxItem, which we want to show while dragging.</param> 
    /// <param name="adornerLayer">Presentation layer for the adorner.</param> 
    /// <param name="width"></param> 
    public DraggedAdorner(ListBoxItem listBoxItem, ListBox listBox, AdornerLayer adornerLayer, double width, double height) 
     : base(listBox) 
    { 
     draggedItemAdornerLayer = adornerLayer;    
     draggedItemPresenter = new ContentPresenter 
     { 
      Content = listBoxItem, 
      Width = width, 
      Height = height 
     }; 
     draggedItemAdornerLayer.Add(this); 
    } 

    /// <summary> 
    /// Sets the position of the dragged adorner. 
    /// </summary> 
    /// <param name="newLeft">new left position of the adorner</param> 
    /// <param name="newTop">new top position of the adorner</param> 
    public void SetPosition(double newLeft, double newTop) 
    { 
     // -1 and +13 align the dragged adorner with the dashed rectangle that shows up 
     // near the mouse cursor when dragging. 
     left = newLeft; 
     top = newTop; 
     if (draggedItemAdornerLayer != null) 
     { 
      draggedItemAdornerLayer.Update(AdornedElement); 
     } 
    } 

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

    protected override Size ArrangeOverride(Size finalSize) 
    { 
     draggedItemPresenter.Arrange(new Rect(finalSize)); 
     return finalSize; 
    } 

    protected override Visual GetVisualChild(int index) 
    { 
     return draggedItemPresenter; 
    } 

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

    public override GeneralTransform GetDesiredTransform(GeneralTransform transform) 
    { 
     GeneralTransformGroup result = new GeneralTransformGroup(); 
     result.Children.Add(base.GetDesiredTransform(transform)); 
     result.Children.Add(new TranslateTransform(left, top)); 

     return result; 
    } 

    /// <summary> 
    /// Removes the this adorner form the adornerlayer. 
    /// </summary> 
    public void Detach() 
    { 
     draggedItemAdornerLayer.Remove(this); 
    } 
} 

誰能幫助我？

Answer 1

我現在加入了背景中一個簡單的辦法：我只是增加財產填充=的backgroundColor一個矩形：

public class DraggedAdorner : Adorner 
{ 
    private readonly Rectangle background; 
    private readonly ContentPresenter draggedItemPresenter; 
    private readonly AdornerLayer draggedItemAdornerLayer; 

    private double left; 
    private double top; 

    /// <summary> 
    /// Initializes a new adorner, which will display the dragged listbox-item. 
    /// </summary> 
    /// <param name="listBoxItem">ListBoxItem, which we want to show while dragging.</param> 
    /// <param name="listBox">ListBoxItem, which we want to show while dragging.</param> 
    /// <param name="adornerLayer">Presentation layer for the adorner.</param> 
    /// <param name="width"></param> 
    public DraggedAdorner(ListBoxItem listBoxItem, ListBox listBox, AdornerLayer adornerLayer, double width, double height) 
     : base(listBox) 
    { 
     draggedItemAdornerLayer = adornerLayer;    
     draggedItemPresenter = new ContentPresenter 
     { 
      Content = listBoxItem, 
      Width = width, 
      Height = height 
     }; 
     Rectangle rectangle = new Rectangle 
      { 
       Width = width, 
       Height = height, 
       Fill = new SolidColorBrush(Colors.SkyBlue) 
      }; 
     background = rectangle; 
     draggedItemAdornerLayer.Add(this); 
    } 

    /// <summary> 
    /// Sets the position of the dragged adorner. 
    /// </summary> 
    /// <param name="newLeft">new left position of the adorner</param> 
    /// <param name="newTop">new top position of the adorner</param> 
    public void SetPosition(double newLeft, double newTop) 
    { 
     //only set the left property the first time, to not allow dragging the listboxitem 
     //out of the listbox in the horizontal direction. 
     if (Math.Abs(left) < 0.1) 
     { 
      left = newLeft + 20; 
     } 
     top = newTop; 
     if (draggedItemAdornerLayer != null) 
     { 
      draggedItemAdornerLayer.Update(AdornedElement); 
     } 
    } 

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



    protected override Size ArrangeOverride(Size finalSize) 
    { 
     draggedItemPresenter.Arrange(new Rect(finalSize)); 
     background.Arrange(new Rect(finalSize)); 
     return finalSize; 
    } 

    protected override Visual GetVisualChild(int index) 
    { 
     return index == 0 ? (Visual) background : draggedItemPresenter; 
    } 

    protected override int VisualChildrenCount 
    { 
     get { return 2; } 
    } 

    public override GeneralTransform GetDesiredTransform(GeneralTransform transform) 
    { 
     GeneralTransformGroup result = new GeneralTransformGroup(); 
     result.Children.Add(base.GetDesiredTransform(transform)); 
     result.Children.Add(new TranslateTransform(left, top)); 

     return result; 
    } 

    /// <summary> 
    /// Removes the this adorner form the adornerlayer. 
    /// </summary> 
    public void Detach() 
    { 
     draggedItemAdornerLayer.Remove(this); 
    } 
}