LunarPresentation/Adorners/PaperSizeLineAdorner.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
{
    /// <summary>
    /// 上下标式的辅助线装饰器。
    /// </summary>
    public class PaperSizeLineAdorner : Adorner
    {
        /// <summary>
        /// 用在主界面的标尺辅助线装饰器。
        /// </summary>
        /// <param name="adornedElement">应传入对应编辑器的RootPanel。</param>
        public PaperSizeLineAdorner(Editor editor, Expressions.SubPanel adornedElement)
            : base(adornedElement)
        {
            masterEditor = editor;

            this.pageMargin = new Thickness(
                masterEditor.PageSettingInfo.MarginLeft,
                masterEditor.PageSettingInfo.MarginTop,
                masterEditor.PageSettingInfo.MarginRight,
                masterEditor.PageSettingInfo.MarginBottom
                );

            //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.MouseLeftButtonDown += new MouseButtonEventHandler(PaperSizeLineAdorner_MouseLeftButtonDown);

            this.Opacity = 50;
            this.ToolTip = "A4 估算线\r\n\r\n点击关闭";
        }

        void PaperSizeLineAdorner_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            this.IsEnable = false;
        }

        private bool isEnable = false;

        /// <summary>
        /// 是否启用此标尺。
        /// </summary>
        private bool IsEnable
        {
            get { return isEnable; }
            set
            {
                isEnable = value;
                this.InvalidateVisual();
            }
        }