LunarPresentation/Widegets/ArrowPanel.cs

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using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
using SHomeWorkshop.LunarPresentation.Expressions;

namespace SHomeWorkshop.LunarPresentation.Widegets
{
    public class ArrowPanel : Canvas
    {
        public ArrowPanel(Arrow parentArrowExpression)
        {
            this.parentArrowExpression = parentArrowExpression;
            this.Background = Brushes.Transparent;
            this.SizeChanged += new SizeChangedEventHandler(ArrowPanel_SizeChanged);
        }

        private Arrow parentArrowExpression;

        public Arrow ParentArrowExpression
        {
            get { return parentArrowExpression; }
            set { parentArrowExpression = value; }
        }

        private Path myPath;

        void ArrowPanel_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            UpdateArrows();
        }

        private Brush foreground = Brushes.White;//默认白色。

        public Brush Foreground
        {
            get { return foreground; }
            set
            {
                foreground = value;
                UpdateArrows();
            }
        }

        public void UpdateArrows()
        {
            this.Children.Clear();
            if (parentArrowExpression == null) return;
            if (parentArrowExpression.ParentPanel == null) return;

            double halfOfWidth = this.ActualWidth / 2;
            double halfOfHeight = this.ActualHeight / 2;

            if (halfOfHeight <= 0 || halfOfWidth <= 0) return;

            double quarterOfWidth = halfOfWidth / 2;
            double quarterOfHeight = halfOfHeight / 2;

            myPath = new Path();