第一步

第二部

部分代码:

private void show(int xh, FrameworkElement fe, string con, Visibility vis = Visibility.Visible)
{
    Point point = fe.TransformToAncestor(Window.GetWindow(fe)).Transform(new Point(0, 0));//获取控件坐标点

    RectangleGeometry rg = new RectangleGeometry();
    rg.Rect = new Rect(0, 0, this.Width, this.Height);
    borGeometry = Geometry.Combine(borGeometry, rg, GeometryCombineMode.Union, null);
    bor.Clip = borGeometry;

    RectangleGeometry rg1 = new RectangleGeometry();
    rg1.Rect = new Rect(point.X - 5, point.Y - 5, fe.ActualWidth + 10, fe.ActualHeight + 10);
    borGeometry = Geometry.Combine(borGeometry, rg1, GeometryCombineMode.Exclude, null);

    bor.Clip = borGeometry;

    HintUC hit = new HintUC(xh.ToString(), con, vis);
    Canvas.SetLeft(hit, point.X + fe.ActualWidth + 3);
    Canvas.SetTop(hit, point.Y + fe.ActualHeight + 3);
    hit.nextHintEvent -= Hit_nextHintEvent;
    hit.nextHintEvent += Hit_nextHintEvent;
    can.Children.Add(hit);

    index++;
}

 贴出来部分代码，

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