LunarPresentation/Adorners/LeafAcorner.cs

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

namespace SHomeWorkshop.LunarPresentation.Adorners
{
    /// <summary>
    /// 叶面板的折叠标记。
    /// </summary>
    public class LeafAdorner : Adorner
    {
        /// <summary>
        /// 叶面板的折叠标记。
        /// </summary>
        /// <param name="adornedElement">应传入叶面板。</param>
        public LeafAdorner(Expressions.LeafPanel 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.masterLeaf = adornedElement;

            this.Cursor = Cursors.Hand;
            this.ToolTip = LeafAdorner.CustomToolTip;

            this.MouseDown += new MouseButtonEventHandler(LeafAdorner_MouseDown);
            this.MouseEnter += new MouseEventHandler(LeafAdorner_MouseEnter);
            this.MouseLeave += new MouseEventHandler(LeafAdorner_MouseLeave);
        }

        void LeafAdorner_MouseLeave(object sender, MouseEventArgs e)
        {
            this.InvalidateVisual();
        }

        void LeafAdorner_MouseEnter(object sender, MouseEventArgs e)
        {
            this.InvalidateVisual();
        }

        void LeafAdorner_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (masterLeaf == null) return;
            if (masterLeaf.Editor == null) return;

            masterLeaf.Editor.SelectedExpression = masterLeaf;
            e.Handled = true;
        }

        public static readonly string CustomToolTip = "被折叠，按 Z 键展开";

        private Expressions.LeafPanel masterLeaf;

        /// <summary>
        /// 使用本折叠标记的叶面板。
        /// </summary>
        public Expressions.LeafPanel MasterLeaf