LunarMind/Adorners/AddLowerLevelTitleAdorner.cs

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

namespace SHomeWorkshop.LunarMind.Adorners
{
    /// <summary>
    /// 用于点击添加下级标题。
    /// </summary>
    public class AddLowerLevelTitleAdorner : Adorner
    {
        // Be sure to call the base class constructor.
        /// <summary>
        /// 用以表示标题被折叠状态的装饰器。
        /// </summary>
        /// <param name="adornedElement">应传入标题的“MainBorder”主子元素。</param>
        public AddLowerLevelTitleAdorner(UIElement adornedElement, Title masterTitle)
            : base(adornedElement)
        {
            this.masterTitle = masterTitle;

            //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.MouseEnter += new System.Windows.Input.MouseEventHandler(TitleCollapseAdorner_MouseEnter);
            this.MouseLeave += new System.Windows.Input.MouseEventHandler(TitleCollapseAdorner_MouseLeave);
        }

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

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

        private Title masterTitle;

        public Title MasterTitle
        {
            get { return masterTitle; }
        }

        // 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)
        {
            if (this.masterTitle == null || masterTitle.BeCollapsed || masterTitle.IsFixed ||
                masterTitle.HigherLevelTitleID == null || masterTitle.HigherLevelTitleID.Length <= 0)
            {
                this.Visibility = Visibility.Hidden;
                return;
            }
            else
            {
                this.Visibility = Visibility.Visible;
            }