我有一个如下定义的装饰器:
private class ErrorAdorner : Adorner
{
private readonly Border _errorBorder;
public ErrorAdorner(UIElement adornedElement)
: base(adornedElement)
{
_errorBorder = new Border();
_errorBorder.BorderThickness = new Thickness(2);
_errorBorder.BorderBrush = Brushes.Red;
Image img = new Image();
img.HorizontalAlignment = HorizontalAlignment.Right;
img.VerticalAlignment = VerticalAlignment.Center;
img.Stretch = Stretch.None;
Binding imgBinding = new Binding
{
Source = adornedElement,
Path = new PropertyPath(IconProperty)
};
img.SetBinding(Image.SourceProperty, imgBinding);
Binding ttBinding = new Binding
{
Source = adornedElement,
Path = new PropertyPath(ErrorMessageProperty)
};
img.SetBinding(ToolTipProperty, ttBinding);
_errorBorder.Child = img;
}
protected override Size MeasureOverride(Size constraint)
{
AdornedElement.Measure(constraint);
return AdornedElement.RenderSize;
}
protected override Size ArrangeOverride(Size finalSize)
{
_errorBorder.Arrange(new Rect(finalSize));
return finalSize;
}
protected override Visual GetVisualChild(int index)
{
if (index == 0)
return _errorBorder;
throw new ArgumentOutOfRangeException("index");
}
protected override int VisualChildrenCount
{
get
{
return 1;
}
}
}
ErrorMessage
并且是在封闭类 ( )Icon
中声明的附加属性。ErrorProvider
当ErrorMessage
属性设置为非空值时,装饰器被添加到元素中。
我的问题是,虽然正确渲染了装饰器,ToolTip
但当我将鼠标移到图像上时,图像上的 不会显示。我知道这不是绑定问题:当我使用 Snoop 检查控件时,我可以看到该ToolTip
属性具有预期值。我怀疑这个问题与命中测试有关,因为我无法在装饰器中接收到任何与鼠标相关的事件......该IsHitTestVisible
属性设置为 true,所以我不明白为什么我没有收到这些事件。
任何想法?