14689080655

Committed 27 Apr 2025 06:07AM UTC coverage: 75.049% (-0.2%) from 75.239%

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Merge pull request #621 from nanoLogika/20250402_nka_multileader_clone_bugfix

20250402 nka multileader clone bugfix

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/src/ACadSharp/Objects/MultiLeaderStyle.cs

﻿using System;
using ACadSharp.Attributes;
using ACadSharp.Entities;
using ACadSharp.Tables;
using CSMath;

namespace ACadSharp.Objects
{
        /// <summary>
        /// Represents a <see cref="MultiLeaderStyle"/> object.
        /// </summary>
        /// <remarks>
        /// Object name <see cref="DxfFileToken.ObjectMLeaderStyle"/> <br/>
        /// Dxf class name <see cref="DxfSubclassMarker.MLeaderStyle"/>
        /// </remarks>
        [DxfName(DxfFileToken.ObjectMLeaderStyle)]
        [DxfSubClass(DxfSubclassMarker.MLeaderStyle)]
        public class MultiLeaderStyle : NonGraphicalObject
        {
                private LineType _leaderLineType = LineType.ByLayer;
                private TextStyle _textStyle = TextStyle.Default;
                private BlockRecord _arrowhead;
                private BlockRecord _blockContent;


                /// <summary>
                /// Default multiline style name
                /// </summary>
                public const string DefaultName = "Standard";

                /// <summary>
                /// Gets the default MLine style
                /// </summary>
                public static MultiLeaderStyle Default { get { return new MultiLeaderStyle(DefaultName); } }

                /// <inheritdoc/>
                public override ObjectType ObjectType => ObjectType.UNLISTED;

                /// <inheritdoc/>
                public override string ObjectName => DxfFileToken.ObjectMLeaderStyle;

                /// <inheritdoc/>
                public override string SubclassMarker => DxfSubclassMarker.MLeaderStyle;

                /// <summary>
                /// Gets or sets a value indicating the content type for the multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.ContentType"/> property when the
                /// <see cref="MultiLeaderPropertyOverrideFlags.ContentType"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(170)]
                public LeaderContentType ContentType { get; set; }

                //        TODO What is the meaning of this property? Is it relevant for drawing a multileader?
                /// <summary>
                /// DrawMLeaderOrder Type
                /// </summary>
                [DxfCodeValue(171)]
                public MultiLeaderDrawOrderType MultiLeaderDrawOrder { get; set; }

                //        TODO What is the meaning of this property? Is it relevant for drawing a multileader?
                /// <summary>
                /// DrawLeaderOrder Type
                /// </summary>
                [DxfCodeValue(172)]
                public LeaderDrawOrderType LeaderDrawOrder { get; set; }

                /// <summary>
                /// Gets or sets the max number of segments when a new leader is being created for a multileader.
                /// </summary>
                /// <remarks>
                /// This property supports creating and editing a multileader but has no meaning for
                /// the display of multileaders.
                /// </remarks>
                [DxfCodeValue(90)]
                public int MaxLeaderSegmentsPoints { get; set; }

                /// <summary>
                /// Gets or sets a snap angle value for the first leader segment when a leader line
                /// is being created for the mutileader.
                /// </summary>
                /// <remarks>
                /// This property supports creating and editing a multileader but has no meaning for
                /// the display of multileaders.
                /// </remarks>
                /// <value>
                /// An angle value in radians or zero if no angle contstraint is set.
                /// </value>
                [DxfCodeValue(40)]
                public double FirstSegmentAngleConstraint { get; set; }

                /// <summary>
                /// Gets or sets a snap angle value for the second leader segment when a leader line
                /// is being created for the mutileader.
                /// </summary>
                /// <remarks>
                /// This property supports creating and editing a multileader but has no meaning for
                /// the display of multileaders.
                /// </remarks>
                /// <value>
                /// An angle value in radians or zero if no angle contstraint is set.
                /// </value>
                [DxfCodeValue(41)]
                public double SecondSegmentAngleConstraint { get; set; }

                /// <summary>
                /// Gets or sets a value indicating whether leaders are to be displayed as polyline,
                /// a spline curve or invisible. This setting applies for all leader lines of the
                /// multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.PathType"/> property when the
                /// <see cref="MultiLeaderPropertyOverrideFlags.PathType"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.PathType"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.PathType"/> flag is set in the 
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.OverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(173)]
                public MultiLeaderPathType PathType { get; set; }

                /// <summary>
                /// Gets or sets color to be applied all leader lines of the multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.LineColor"/> property when the
                /// <see cref="MultiLeaderPropertyOverrideFlags.LineColor"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.LineColor"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.LineColor"/> flag is set in the 
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.OverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(91)]
                public Color LineColor { get; set; }

                /// <summary>
                /// Gets or sets a <see cref="LineType"/> object specifying line-type properties for the
                /// musltileader. This setting applies for all leader lines of the multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This setting can be overridden by the <see cref="MultiLeader.LeaderLineType"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.LeaderLineType"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// The setting for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.LineType"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.LineType"/> flag is set in the 
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.OverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.Handle, 340)]
                public LineType LeaderLineType
                {
                        get { return this._leaderLineType; }
                        set
                        {
                                if (value == null)
                                {
                                        throw new ArgumentNullException(nameof(value));
                                }

                                if (this.Document != null)
                                {
                                        this._leaderLineType = this.updateTable(value, this.Document.LineTypes);
                                }
                                else
                                {
                                        this._leaderLineType = value;
                                }
                        }
                }

                /// <summary>
                /// Gets or sets a value specifying the lineweight to be applied to all leader lines of the multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.LeaderLineWeight"/> property when the
                /// <see cref="MultiLeaderPropertyOverrideFlags.LeaderLineWeight"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.LineWeight"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.LineWeight"/> flag is set in the 
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.OverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(92)]
                public LineweightType LeaderLineWeight { get; set; }

                //        TODO It seems that this value indicates that for a new leader that is being created
                //                 with this <see cref="MultiLeaderStyle" /> landing i.e. a dogleg is enabled.
                //                 But why can this value be overridden?
                //
                /// <summary>
                /// Gets or sets a value indicating whether landing is enabled.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.EnableLanding"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.EnableLanding"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(290)]
                public bool EnableLanding { get; set; }

                /// <summary>
                /// Gets or sets the landing gap. This is the distance between the leader end point or, if present,
                /// the end of the dogleg and the text label or the content block.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.LandingGap"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.LandingGap"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(42)]
                public double LandingGap { get; set; }

                /// <summary>
                /// Gets or sets a value indicating that leader lines are to be drawn with a dogleg.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.EnableDogleg"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.EnableDogleg"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// Note that this setting has no effect when the <see cref="TextAttachmentDirection"/>
                /// is <see cref="TextAttachmentDirectionType.Vertical"/>.
                /// </para>
                /// </remarks>
                [DxfCodeValue(291)]
                public bool EnableDogleg { get; set; }

                /// <summary>
                /// Gets or sets the landing distance, i.e. the length of the dogleg. 
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.LandingDistance"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.LandingDistance"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(43)]
                public double LandingDistance { get; set; }

                /// <summary>
                /// Gets or sets a text containing the description of this <see cref="MultiLeaderStyle"/>.
                /// </summary>
                [DxfCodeValue(3)]
                public string Description { get; set; }

                /// <summary>
                /// Gets or sets a <see cref="BlockRecord"/> representing the arrowhead
                /// to be displayed with every leader line.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.Arrowhead"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.Arrowhead"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.Arrowhead"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.Arrowhead"/> flag is set in the 
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.OverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.Handle, 341)]
                public BlockRecord Arrowhead
                {
                        get { return this._arrowhead; }
                        set
                        {
                                this._arrowhead = this.updateTable(value, this.Document?.BlockRecords);
                        }
                }

                /// <summary>
                /// Gests or sets the arrowhead size.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.ArrowheadSize"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.ArrowheadSize"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.ArrowheadSize"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.ArrowheadSize"/> flag is set in the 
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.OverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(44)]
                public double ArrowheadSize { get; set; }

                /// <summary>
                /// Gests or sets a default text that is to be set when a mutileader is being created
                /// with this <see cref="MultiLeaderStyle"/>.
                /// </summary>
                [DxfCodeValue(300)]
                public string DefaultTextContents { get; set; }

                /// <summary>
                /// Gets or sets the <see cref="TextStyle"/> to be used to display the text label of the
                /// multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.TextStyle"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextStyle"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.Handle, 342)]
                public TextStyle TextStyle
                {
                        get { return this._textStyle; }
                        set
                        {
                                if (value == null)
                                {
                                        throw new ArgumentNullException(nameof(value));
                                }

                                if (this.Document != null)
                                {
                                        this._textStyle = this.updateTable(value, this.Document.TextStyles);
                                }
                                else
                                {
                                        this._textStyle = value;
                                }
                        }
                }

                /// <summary>
                /// Gets or sets the Text Left Attachment Type.
                /// This value controls the position of the connection point of the leader
                /// attached to the left side of the text label.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.TextLeftAttachment"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextLeftAttachment"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// This property is only relevant if <see cref="TextAttachmentDirection"/> is
                /// <see cref="TextAttachmentDirectionType.Horizontal"/> and a leader attached
                /// to the left side of the text label exists.
                /// </para>
                /// </remarks>
                /// <value>
                /// A <see cref="TextAttachmentType"/> having the values 0-8 
                /// can be used ("horizontal" attachment types).
                /// </value>
                [DxfCodeValue(174)]
                public TextAttachmentType TextLeftAttachment { get; set; }

                //        TODO How to set this value?
                /// <summary>
                /// Gets or sets a value indicating the text angle.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.TextAngle"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextAngle"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(175)]
                public TextAngleType TextAngle { get; set; }

                /// <summary>
                /// Gets or sets the text alignment, i.e. the alignment of text lines if the a multiline
                /// text label, relative to the <see cref="MultiLeaderAnnotContext.TextLocation"/>.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.TextAlignment"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextAlignment"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(176)]
                public TextAlignmentType TextAlignment { get; set; }

                /// <summary>
                /// Gets or sets the Text Right Attachment Type.
                /// This value controls the position of the connection point of the leader
                /// attached to the right side of the text label.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.TextRightAttachment"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextRightAttachment"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// This property is only relevant if <see cref="TextAttachmentDirection"/> is
                /// <see cref="TextAttachmentDirectionType.Horizontal"/> and a leader attached
                /// to the right side of the text label exists.
                /// </para>
                /// </remarks>
                /// <value>
                /// A <see cref="TextAttachmentType"/> having the values 0-8 
                /// can be used ("horizontal" attachment types).
                /// </value>
                [DxfCodeValue(178)]
                public TextAttachmentType TextRightAttachment { get; set; }

                /// <summary>
                /// Gest or sets the color for the text label of the multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.TextColor"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextColor"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(93)]
                public Color TextColor { get; set; }

                /// <summary>
                /// Gest or sets the text height for the text label of the multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.TextHeight"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextHeight"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(45)]
                public double TextHeight { get; set; }

                /// <summary>
                /// Gets or sets a value indicating that the text label is to be drawn with a frame.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.TextFrame"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextFrame"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(292)]
                public bool TextFrame { get; set; }

                //        TODO Is this property only relevant for new leaders?
                /// <summary>
                /// Text Align Always Left
                /// </summary>
                [DxfCodeValue(297)]
                public bool TextAlignAlwaysLeft { get; set; }

                //        TODO What is the meaning of this property?
                /// <summary>
                /// Align Space
                /// </summary>
                [DxfCodeValue(46)]
                public double AlignSpace { get; set; }

                /// <summary>
                /// Gets a <see cref="BlockRecord"/> containing elements
                /// to be drawn as content for the multileader.
                /// </summary>
                /// <remarks>
                /// <para>
                /// Thw standard content block can be overridden by the <see cref="MultiLeaderAnnotContext.BlockContent"/>
                /// property when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContent"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.Handle, 343)]
                public BlockRecord BlockContent
                {
                        get { return this._blockContent; }
                        set {
                                this._blockContent = this.updateTable(value, this.Document?.BlockRecords);
                        }
                }

                /// <summary>
                /// Gets or sets the block-content color.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.BlockContentColor"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContentColor"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(94)]
                public Color BlockContentColor { get; set; }

                /// <summary>
                /// Gets or sets the scale factor for block content.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.BlockContentScale"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContentScale"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(47, 49, 140)]
                public XYZ BlockContentScale { get; set; }

                //        TODO: Cannot be overridden? Is this property only relevant in AutoCAD?
                /// <summary>
                /// Gets or sets a value indicating whether scaling of the block content is enabled.
                /// </summary>
                [DxfCodeValue(293)]
                public bool EnableBlockContentScale { get; set; }

                /// <summary>
                /// Gets or sets the block content rotation.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.BlockContentRotation"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContentRotation"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.IsAngle, 141)]
                public double BlockContentRotation { get; set; }

                //        TODO: Cannot be overridden? Is this property only relevant in AutoCAD?
                /// <summary>
                /// Gets or sets a value indicating whether rotation of the block content is enabled.
                /// </summary>
                [DxfCodeValue(294)]
                public bool EnableBlockContentRotation { get; set; }

                /// <summary>
                /// Gets or sets a value indicating whether the multileader connects to the content-block extents
                /// or to the content-block base point.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.BlockContentConnection"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContentConnection"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(177)]
                public BlockContentConnectionType BlockContentConnection { get; set; }

                /// <summary>
                /// Gets or sets the scale factor for the <see cref="ArrowheadSize"/>, <see cref="LandingDistance"/>,
                /// <see cref="LandingGap"/>, <see cref="TextHeight"/>, and the elements of <see cref="BlockContentScale"/>.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.ScaleFactor"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.ScaleFactor"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para>
                /// </remarks>
                [DxfCodeValue(142)]
                public double ScaleFactor { get; set; }

                /// <summary>
                /// Overwrite Property Value
                /// </summary>
                /// <remarks>
                /// Property changed, meaning not totally clear
                /// might be set to true if something changed after loading,
                /// or might be used to trigger updates in dependent MLeaders.
                /// sequence seems to be different in DXF
                /// </remarks>
                [DxfCodeValue(295)]
                public bool OverwritePropertyValue { get; set; }

                /// <summary>
                /// Is Annotative
                /// </summary>
                [DxfCodeValue(296)]
                public bool IsAnnotative { get; set; }

                //        TODO What is the meaning of this property?
                /// <summary>
                /// Break Gap Size
                /// </summary>
                [DxfCodeValue(143)]
                public double BreakGapSize { get; set; }

                //        TODO Check
                //                 whether this property is relevant for both text an block content
                //                 How it can be overridden by LeaderRoot.AttachmentDirection
                /// <summary>
                /// Gets or sets the Text attachment direction for text or block contents, rename?
                /// This property defines whether the leaders attach to the left/right of the content block/text,
                /// or attach to the top/bottom.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeader.TextAttachmentDirection"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextAttachmentDirection"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderAnnotContext.LeaderRoot.TextAttachmentDirection"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.TextAttachmentDirection"/> flag is set in the 
                /// <see cref="MultiLeaderAnnotContext.LeaderLine.OverrideFlags"/> property.
                /// </para>
                /// </remarks>
                /// <value>
                /// A <see cref="TextAttachmentDirectionType"/>.
                /// </value>
                [DxfCodeValue(271)]
                public TextAttachmentDirectionType TextAttachmentDirection { get; set; }

                /// <summary>
                /// Gets or sets the text bottom attachment type.
                /// This value controls the position of the connection point of the leader
                /// attached to the bottom of the text label.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.TextBottomAttachment"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextBottomAttachment"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// This property is only relevant if <see cref="TextAttachmentDirection"/> is
                /// <see cref="TextAttachmentDirectionType.Vertical"/> and a leader attached
                /// to the bottom of the text label exists.
                /// </para>
                /// </remarks>
                /// <value>
                /// A <see cref="TextAttachmentType"/> having the values
                ///         9 = Center,
                ///         10 = Underline and Center
                /// can be used ("vertical" attachment types).
                /// </value>
                [DxfCodeValue(272)]
                public TextAttachmentType TextBottomAttachment { get; set; }

                /// <summary>
                /// Gets or sets the text top attachment type.
                /// This value controls the position of the connection point of the leader
                /// attached to the top of the text label.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This value can be overridden by the <see cref="MultiLeaderAnnotContext.TextTopAttachment"/> property
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextTopAttachment"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </para><para>
                /// This property is only relevant if <see cref="TextAttachmentDirection"/> is
                /// <see cref="TextAttachmentDirectionType.Vertical"/> and a leader attached
                /// to the top of the text label exists.
                /// </para>
                /// </remarks>
                /// <value>
                /// A <see cref="TextAttachmentType"/> having the values
                ///         9 = Center,
                ///         10 = Underline and Center
                /// can be used ("vertical" attachment types).
                /// </value>
                [DxfCodeValue(273)]
                public TextAttachmentType TextTopAttachment { get; set; }

                /// <summary>
                /// Undocumented in ODS and DXF-ref boolean, found in DXF
                /// </summary>
                [DxfCodeValue(298)]
                public bool UnknownFlag298 { get; set; }

                /// <summary>
                /// Initializes a new instance of the <see cref="MultiLeaderStyle"/> class.
                /// </summary>
                public MultiLeaderStyle() : this(string.Empty) { }

                /// <summary>
                /// Initializes a new instance of the <see cref="MultiLeaderStyle"/> class
                /// and sets the name of this style.
                /// </summary>
                public MultiLeaderStyle(string name) : base()
                {
                        this.Name = name;
                }

                public override CadObject Clone()
                {
                        MultiLeaderStyle clone = (MultiLeaderStyle)base.Clone();
                        clone.TextStyle = (TextStyle)this._textStyle.Clone();
                        clone.LeaderLineType = (LineType)this._leaderLineType.Clone();
                        
                        clone.Arrowhead = (BlockRecord)this._arrowhead?.Clone();
                        clone.BlockContent = (BlockRecord)this._blockContent?.Clone();

                        return clone;
                }

                internal override void AssignDocument(CadDocument doc)
                {
                        base.AssignDocument(doc);

                        this._textStyle = this.updateTable(this._textStyle, doc.TextStyles);
                        this._leaderLineType = this.updateTable(this._leaderLineType, doc.LineTypes);
                        this._arrowhead = this.updateTable(this._arrowhead, doc.BlockRecords);
                        this._blockContent = this.updateTable(this._blockContent, doc.BlockRecords);

                        doc.TextStyles.OnRemove += this.tableOnRemove;
                        doc.LineTypes.OnRemove += this.tableOnRemove;
                        doc.BlockRecords.OnRemove += this.tableOnRemove;
                }

                internal override void UnassignDocument()
                {
                        this.Document.TextStyles.OnRemove -= this.tableOnRemove;
                        this.Document.LineTypes.OnRemove -= this.tableOnRemove;
                        this.Document.BlockRecords.OnRemove -= this.tableOnRemove;

                        base.UnassignDocument();

                        this._textStyle = (TextStyle)this._textStyle.Clone();
                        this._leaderLineType = (LineType)this._leaderLineType.Clone();
                        this._arrowhead = (BlockRecord)this._arrowhead?.Clone();
                        this._blockContent = (BlockRecord)this._blockContent?.Clone();
                }

                protected virtual void tableOnRemove(object sender, CollectionChangedEventArgs e)
                {
                        if (e.Item.Equals(this._textStyle))
                        {
                                this._textStyle = this.Document.TextStyles[Layer.DefaultName];
                        }

                        if (e.Item.Equals(this._leaderLineType))
                        {
                                this._leaderLineType = this.Document.LineTypes[LineType.ByLayerName];
                        }

                        if (e.Item.Equals(this.Arrowhead))
                        {
                                this._arrowhead = null;
                        }

                        if (e.Item.Equals(this.BlockContent))
                        {
                                this._blockContent = null;
                        }
                }
        }
}

DomCR / ACadSharp / 14689080655

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