LunarPresentation/Adorners/MaskAdorner.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>
    /// 文本块的遮罩。
    /// </summary>
    public class MaskAdorner : Adorner
    {
        /// <summary>
        /// 文本块的罩子。如果其它公式也支持的话，一来并无多大意义，
        /// 二来出现多层遮罩可能看不清。
        /// </summary>
        /// <param name="adornedElement">应传入文本块。</param>
        public MaskAdorner(Expressions.BaseText 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(TextOptions.TextFormattingModeProperty, TextFormattingMode.Display);

            this.masterBt = adornedElement;

            this.Cursor = Cursors.Hand;

            this.PreviewMouseLeftButtonDown += new MouseButtonEventHandler(MaskAdorner_PreviewMouseLeftButtonDown);
            this.PreviewMouseLeftButtonUp += new MouseButtonEventHandler(MaskAdorner_PreviewMouseLeftButtonUp);
            this.PreviewMouseRightButtonDown += new MouseButtonEventHandler(MaskAdorner_PreviewMouseRightButtonDown);
        }

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

        void MaskAdorner_PreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (this.masterBt != null && this.masterBt.Editor != null)
            {
                this.masterBt.Editor.SelectedExpression = this.masterBt;
            }

            e.Handled = true;
        }

        void MaskAdorner_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (this.masterBt != null && this.masterBt.Editor != null)
            {
                this.masterBt.Editor.SelectedExpression = this.masterBt;

                if (Globals.dragSourceExpression != masterBt)
                {
                    Globals.dragSourceExpression = masterBt;
                }
            }