LunarPresentation/Adorners/SelectionAdorner.cs

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using System.Windows;
using System.Windows.Documents;
using System.Windows.Media;

namespace SHomeWorkshop.LunarPresentation.Adorners
{
    public class SelectionAdorner : Adorner
    {
        // Be sure to call the base class constructor.
        /// <summary>
        /// 用以表示公式被选取状态的装饰器。
        /// </summary>
        /// <param name="adornedElement">应传入公式的“MainBorder”主子元素。</param>
        /// <param name="masterExpression">宿主公式，装饰器就是表示这个公式的被选取状态。</param>
        public SelectionAdorner(UIElement adornedElement, Expressions.Expression masterExpression)
            : base(adornedElement)
        {
            this.masterExpression = masterExpression;

            //终于解决了选取装饰器中线条宽度为2而不是1像素的问题！！！
            this.SnapsToDevicePixels = true;
            this.SetValue(RenderOptions.EdgeModeProperty, EdgeMode.Aliased);
        }

        private Expressions.Expression masterExpression;

        public Expressions.Expression MasterExpression
        {
            get { return masterExpression; }
        }

        public bool IsSubPanel
        {
            get { return masterExpression == null ? false : (masterExpression is Expressions.SubPanel); }
        }

        // A common way to implement an adorner's rendering behavior is to override the OnRender
        // method, which is called by the layout system as part of a rendering pass.
        protected override void OnRender(DrawingContext drawingContext)
        {
            Rect adornedElementRect = new Rect(this.AdornedElement.RenderSize);

            // Some arbitrary drawing implements.
            //renderBrush.Opacity = 0.2;

            #region 先画线。
            Pen linePen = null;
            if (!IsSubPanel)
            {
                if (this.masterExpression != null &&
                    this.masterExpression.Editor != null)
                {
                    //linePen = new Pen(Brushes.GreenYellow, 1);
                    linePen = this.masterExpression.Editor.ExSelectionAdornerPen;
                    linePen.DashStyle = DashStyles.Dash;
                }
                else
                {
                    linePen = null;
                }