LunarPresentation/Adorners/IndentAdorner.cs

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

namespace SHomeWorkshop.LunarPresentation.Adorners
{
    public class IndentAdorner : Adorner
    {
        // Be sure to call the base class constructor.
        /// <summary>
        /// 用以表示缩进状态的装饰器。
        /// </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 IndentAdorner(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);

            Cursor = System.Windows.Input.Cursors.Hand;
            MouseLeftButtonDown += new System.Windows.Input.MouseButtonEventHandler(IndentAdorner_MouseLeftButtonDown);
            MouseLeftButtonUp += new System.Windows.Input.MouseButtonEventHandler(IndentAdorner_MouseLeftButtonUp);

            MouseRightButtonDown += new MouseButtonEventHandler(IndentAdorner_MouseRightButtonDown);

            MouseEnter += new System.Windows.Input.MouseEventHandler(IndentAdorner_MouseEnter);
            MouseLeave += new System.Windows.Input.MouseEventHandler(IndentAdorner_MouseLeave);
        }

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

            e.Handled = true;
        }

        void IndentAdorner_MouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            //完成拖动。
            Globals.DropExpression(this.masterExpression);
        }

        void IndentAdorner_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
        {
            InvalidateVisual();
        }