aistudio-wpf-diagram/Extensions/AIStudio.Wpf.Block/Controls/BlockPanel.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace AIStudio.Wpf.Block.Controls
{
    public class BlockPanel : Panel
    {
        #region 依赖属性
        public static readonly DependencyProperty BackgroundProperty =
            DependencyProperty.Register(nameof(Background), typeof(Brush), typeof(BlockPanel)
                , new PropertyMetadata(new SolidColorBrush(Color.FromRgb(255, 255, 255))));
        /// <summary>
        /// 背景色，默认值为#FFFFFF，白色
        /// </summary>
        public Brush Background
        {
            get
            {
                return (Brush)GetValue(BackgroundProperty);
            }
            set
            {
                SetValue(BackgroundProperty, value);
            }
        }

        public static readonly DependencyProperty PaddingProperty =
            DependencyProperty.Register(nameof(Padding), typeof(Thickness), typeof(BlockPanel)
                , new PropertyMetadata(new Thickness(0, 0, 0, 0)));
        /// <summary>
        /// 内边距
        /// </summary>
        public Thickness Padding
        {
            get
            {
                return (Thickness)GetValue(PaddingProperty);
            }
            set
            {
                SetValue(PaddingProperty, value);
            }
        }

        public static readonly DependencyProperty BorderBrushProperty =
            DependencyProperty.Register(nameof(BorderBrush), typeof(Brush), typeof(BlockPanel)
                , new PropertyMetadata(default(Brush)));
        /// <summary>
        /// 边框颜色
        /// </summary>
        public Brush BorderBrush
        {
            get
            {
                return (Brush)GetValue(BorderBrushProperty);
            }
            set
            {
                SetValue(BorderBrushProperty, value);
            }
        }

        public static readonly DependencyProperty BorderThicknessProperty =
            DependencyProperty.Register(nameof(BorderThickness), typeof(Thickness), typeof(BlockPanel), new PropertyMetadata(new Thickness(0d)));
        /// <summary>
        /// 边框大小
        /// </summary>
        public Thickness BorderThickness
        {
            get
            {
                return (Thickness)GetValue(BorderThicknessProperty);
            }
            set
            {
                SetValue(BorderThicknessProperty, value);
            }
        }
        #endregion

        protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters)
        {
            Point hitPoint = hitTestParameters.HitPoint;

            // 在此处实现自定义的命中测试逻辑
            if (IsPointInsideCustomRegion(hitPoint))
            {
                return new PointHitTestResult(this, hitPoint);
            }

            return null; // 不命中
        }

        private bool IsPointInsideCustomRegion(Point point)
        {
            // 在此处检测点是否在自定义区域内
            // 返回 true 表示命中，返回 false 表示不命中
            return false;
        }

        protected Brush CreateFillBrush()
        {
            Brush result = null;

            System.Windows.Media.GradientStopCollection gsc = new System.Windows.Media.GradientStopCollection();
            gsc.Add(new System.Windows.Media.GradientStop(((SolidColorBrush)this.Background).Color, 0));
            LinearGradientBrush backGroundBrush = new LinearGradientBrush(gsc, new Point(0, 0), new Point(0, 1));
            result = backGroundBrush;

            return result;
        }
    }
}