LunarPresentation/Adorners/AssistAdorner.cs

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using System.Collections.Generic;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;

namespace SHomeWorkshop.LunarPresentation.Adorners
{
    /// <summary>
    /// 上下标式的辅助线装饰器。
    /// </summary>
    public class AssistAdorner : Adorner
    {
        /// <summary>
        /// 上下标式的辅助线装饰器。
        /// </summary>
        public AssistAdorner(Expressions.MarkText adornedElement)
            : base(adornedElement)
        {
            //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);

            this.masterMt = adornedElement;
            this.Cursor = Cursors.Hand;

            this.MouseLeftButtonDown += new MouseButtonEventHandler(AssistAdorner_MouseLeftButtonDown);
            this.MouseLeftButtonUp += new MouseButtonEventHandler(AssistAdorner_MouseLeftButtonUp);

            this.MouseRightButtonDown += new MouseButtonEventHandler(AssistAdorner_MouseRightButtonDown);
        }

        void AssistAdorner_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (masterMt != null && masterMt.Editor != null)
            {
                if (masterMt.Editor.SelectedExpression != masterMt)
                {
                    masterMt.Editor.SelectedExpression = masterMt;
                }
            }

            e.Handled = true;
        }

        void AssistAdorner_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            //完成拖动。
            Globals.DropExpression(this.masterMt);
        }

        void AssistAdorner_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (masterMt != null && masterMt.Editor != null)
            {
                if (masterMt.Editor.SelectedExpression != masterMt)
                {
                    masterMt.Editor.SelectedExpression = masterMt;
                }