18679832337

Committed 21 Oct 2025 09:46AM UTC coverage: 77.883% (-0.2%) from 78.126%

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Merge pull request #832 from DomCR/multileader-dxf

multileader dxf

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/src/ACadSharp/Entities/MultiLeader.cs

﻿using System;
using System.Collections.Generic;
using ACadSharp.Attributes;
using ACadSharp.Objects;
using ACadSharp.Tables;

using CSMath;

namespace ACadSharp.Entities
{
        /// <summary>
        /// Represents a <see cref="MultiLeader"/> entity.
        /// </summary>
        /// <remarks>
        /// Object name <see cref="DxfFileToken.EntityMultiLeader"/> <br/>
        /// Dxf class name <see cref="DxfSubclassMarker.MultiLeader"/>
        /// </remarks>
        [DxfName(DxfFileToken.EntityMultiLeader)]
        [DxfSubClass(DxfSubclassMarker.MultiLeader)]
        public partial class MultiLeader : Entity
        {
                /// <summary>
                /// Gets or sets a <see cref="BlockRecord"/> representing the arrowhead
                /// (see <see cref="MultiLeaderStyle.Arrowhead"/>) to be displayed with every leader line.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.Arrowhead"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </summary>
                /// <remarks>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.Arrowhead"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.Arrowhead"/> flag is set in the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.OverrideFlags"/> property.
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.Handle, 342)]
                public BlockRecord Arrowhead
                {
                        get { return this._arrowhead; }
                        set
                        {
                                this._arrowhead = updateCollection(value, this.Document?.BlockRecords);
                        }
                }

                /// <summary>
                /// Gets or sets the arrowhead size (see <see cref="MultiLeaderStyle.Arrowhead"/>)
                /// for every leader line
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.ArrowheadSize"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </summary>
                /// <remarks>
                /// <para>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.ArrowheadSize"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.ArrowheadSize"/> flag is set in the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.OverrideFlags"/> property.
                /// </para><para>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.ArrowheadSize"/> is
                /// assumed to be used.
                /// </para>
                /// </remarks>
                [DxfCodeValue(42)]
                public double ArrowheadSize { get; set; }

                ///<subject>
                /// Gets a list of <see cref="BlockAttribute"/> objects representing
                /// a reference to a "block attribute"? and some properties to adjust
                /// the attribute.
                /// </subject>
                public IList<BlockAttribute> BlockAttributes { get; private set; } = new List<BlockAttribute>();

                /// <summary>
                /// Gets or sets a value indicating whether the content of this <see cref="MultiLeader"/>
                /// is a text label, a content block, or a tolerance.
                /// </summary>
                [DxfCodeValue(172)]
                public LeaderContentType ContentType { get; set; }

                /// <summary>
                /// Gets the embedded <see cref="MultiLeaderObjectContextData"/> object
                /// contains the multileader content (block/text) and the leaders.
                /// </summary>
                /// <remarks><para>
                /// The embedded <see cref="MultiLeaderObjectContextData"/> object is used
                /// if the <see cref="EnableAnnotationScale"/> property is <b>false</b>.
                /// If <see cref="EnableAnnotationScale"/> is <b>true</b> an alternate
                /// <see cref="MultiLeaderObjectContextData"/> object with the respective
                /// scaling value that is linked via the <see cref="CadObject.XDictionary"/>
                /// property.
                /// </para><para>
                /// Note: The properties of the various <see cref="MultiLeaderObjectContextData"/> objects
                /// are currently not synchronized.
                /// </para>
                /// </remarks>
                public MultiLeaderObjectContextData ContextData
                {
                        get
                        {
                                return _contextData;
                        }
                }

                /// <summary>
                /// Enable Annotation Scale
                /// </summary>
                [DxfCodeValue(293)]
                public bool EnableAnnotationScale { get; set; }

                /// <summary>
                /// Gets or sets a value indicating that leader lines of this <see cref="MultiLeader"/>
                /// are to be drawn with a dogleg (see <see cref="MultiLeaderStyle.EnableDogleg"/>).
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.EnableDogleg"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </summary>
                [DxfCodeValue(291)]
                public bool EnableDogleg { get; set; }

                /// <summary>
                /// Gets or sets a value indicating whether landing is enabled.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.EnableLanding"/> flag is set in the
                /// <see cref="PropertyOverrideFlags"/> property.
                /// </summary>
                [DxfCodeValue(290)]
                public bool EnableLanding { get; set; }

                /// <summary>
                /// Leader extended to text
                /// </summary>
                [DxfCodeValue(295)]
                public bool ExtendedToText { get; set; }

                /// <summary>
                /// Gets or sets the landing distance, i.e. the length of the dogleg, for this <see cref="MultiLeader"/>.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.LandingDistance"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </summary>
                /// <remarks><para>
                /// There is only one field for the landing distance in the multileader property grid.
                /// The value entered arrives in this property and the <see cref="Objects.MultiLeaderObjectContextData.LeaderRoot.LandingDistance"/>
                /// property. If two leader roots exist both receive the same value. I seems
                /// <see cref="MultiLeaderPropertyOverrideFlags.LandingDistance"/> flag is never set.
                /// </para>
                /// </remarks>
                [DxfCodeValue(41)]
                public double LandingDistance { get; set; }

                //  TODO Additional Line Type? see Entity.LineType.
                /// <summary>
                /// Gets or sets <see cref="LineType"/> of the leader lines of this <see cref="MultiLeader"/>
                /// (see <see cref="MultiLeaderStyle.LeaderLineType"/>).
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.LeaderLineType"/> flag is set in the
                /// <see cref="PropertyOverrideFlags"/> property.
                /// </summary>
                /// <remarks>
                /// The setting for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.LineType"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.LineType"/> flag is set in the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.OverrideFlags"/> property.
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.Handle, 341)]
                public LineType LeaderLineType
                {
                        get { return this._leaderLineType; }
                        set
                        {
                                if (value == null)
                                {
                                        throw new ArgumentNullException(nameof(value));
                                }

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

                //  TODO Additional Line Weight? see Entity.LineWeight.
                /// <summary>
                /// Gets or sets a value specifying the line weight to be applied to all leader lines of this
                /// <see cref="MultiLeader"/> (see <see cref="MultiLeaderStyle.LeaderLineWeight"/>).
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.LeaderLineWeight"/> flag is set in the
                /// <see cref="PropertyOverrideFlags"/> property.
                /// </summary>
                /// <remarks>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.LineWeight"/> property when the
                /// <see cref="LeaderLinePropertOverrideFlags.LineWeight"/> flag is set in the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.OverrideFlags"/> property.
                /// </remarks>
                [DxfCodeValue(171)]
                public LineWeightType LeaderLineWeight { get; set; }

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

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

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

                /// <summary>
                /// Gets or sets a value indicating the path type of this <see cref="MultiLeader"/>
                /// (see <see cref="MultiLeaderStyle.PathType"/>).
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.PathType"/> flag is set in the
                /// <see cref="PropertyOverrideFlags"/> property.
                /// </summary>
                [DxfCodeValue(170)]
                public MultiLeaderPathType PathType { get; set; }

                /// <summary>
                /// Gets or sets a value containing a list of flags indicating which multileader
                /// properties specified by the associated <see cref="MultiLeaderStyle"/>
                /// are to be overridden by properties specified by this <see cref="MultiLeader"/>
                /// or the attached <see cref="MultiLeaderObjectContextData"/>.
                /// </summary>
                [DxfCodeValue(90)]
                public MultiLeaderPropertyOverrideFlags PropertyOverrideFlags { get; set; }

                /// <summary>
                /// Gets or sets a scale factor (see <see cref="MultiLeaderStyle.ScaleFactor"/>).
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.ScaleFactor"/> flag is set (see
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property).
                /// The scale factor is applied by AutoCAD.
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.ScaleFactor"/> is
                /// assumed to be relevant.
                /// </remarks>
                [DxfCodeValue(45)]
                public double ScaleFactor { get; set; }

                /// <summary>
                /// Gets a <see cref="MultiLeaderStyle"/> providing reusable style information
                /// for this <see cref="MultiLeader"/>.
                /// </summary>
                [DxfCodeValue(DxfReferenceType.Handle, 340)]
                public MultiLeaderStyle Style
                {
                        get { return this._style; }
                        set
                        {
                                if (value == null)
                                {
                                        throw new ArgumentNullException(nameof(value));
                                }

                                if (this.Document != null)
                                {
                                        this._style = updateCollection(value, this.Document.MLeaderStyles);
                                }
                                else
                                {
                                        this._style = value;
                                }
                        }
                }

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

                /// <summary>
                /// Text Align in IPE (meaning unknown)
                /// </summary>
                [DxfCodeValue(178)]
                public short TextAligninIPE { get; set; }

                //        TODO According to the OpenDesign_Specification_for_.dwg_files
                //        a list of arror head AND a list of block attributes can occur.
                //        If both list are empty it ist expected that two BL-fields should
                //        occur yielding count=0 for both lists. But when we read two
                //        BL-fields we get out of sync. If we read one BL-field everything
                //        works fine.
                //        We do not understand what a list of arroheads can be used for,
                //        and we do not know how to create such a list.
                //        The documentation for arrowheads list in OpenDesign_Specification_for_.dwg_files
                //        and the DXF Reference are contradicting.
                //        Decision:
                //                Ommit the Arrowheads property,
                //                try to keep the block attributes.
                /// <summary>
                /// Gets or sets the Text attachment direction for text or block contents.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextAttachmentDirection"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </summary>
                /// <remarks>
                /// <para>
                /// This property defines whether the leaders attach to the left/right of the content block/text,
                /// or attach to the top/bottom.
                /// </para><para>
                /// The value for all leader lines can be overridden for each individual leader line by the
                /// <see cref="Objects.MultiLeaderObjectContextData.LeaderRoot.TextAttachmentDirection"/> property when the
                /// <see cref="MultiLeaderPropertyOverrideFlags.TextAttachmentDirection"/> flag is set in the
                /// <see cref="MultiLeaderObjectContextData.LeaderLine.OverrideFlags"/> property.
                /// </para>
                /// </remarks>
                /// <value>
                /// A <see cref="TextAttachmentDirectionType"/>.
                /// </value>
                [DxfCodeValue(271)]
                public TextAttachmentDirectionType TextAttachmentDirection { get; set; }

                /// <summary>
                /// Gets or sets a value indicating the text attachment point.
                /// </summary>
                /// <remarks><para>
                ///        The Open Design Specification for DWG files documents this property as <i>Justification</i>,
                /// the DXF reference as <i>Text Attachments point</i>.
                /// </para><para>
                /// This property is also exposed by the <see cref="MultiLeader"/> class
                /// (<see cref="MultiLeader.TextAttachmentPoint"/>).
                /// The <see cref="MultiLeaderObjectContextData.TextAttachmentPoint"/> property always has the same value
                /// and seems to have the respective value as <see cref="MultiLeaderObjectContextData.TextAlignment"/>.
                /// The <see cref="MultiLeaderObjectContextData.TextAttachmentPoint"/> property is to be used.
                /// </para>
                /// </remarks>
                [DxfCodeValue(179)]
                public TextAttachmentPointType TextAttachmentPoint { get; set; }

                /// <summary>
                /// Gets or sets the text bottom attachment type (see <see cref="MultiLeaderStyle.TextBottomAttachment"/>).
                /// This property override the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextBottomAttachment"/> flag is set (see
                /// <see cref="PropertyOverrideFlags"/> property).
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.TextBottomAttachment"/> is
                /// assumed to be used.
                /// </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; }

                //  public IList<ArrowheadAssociation> Arrowheads { get; } = new List<ArrowheadAssociation>();
                /// <summary>
                /// Text Direction Negative
                /// </summary>
                [DxfCodeValue(294)]
                public bool TextDirectionNegative { get; set; }

                /// <summary>
                /// Gets or sets the text top attachment type (see <see cref="MultiLeaderStyle.TextTopAttachment"/>).
                /// This property override the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextTopAttachment"/> flag is set (see
                /// <see cref="PropertyOverrideFlags"/> property).
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.TextTopAttachment"/> is
                /// assumed to be used.
                /// </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; }

                private BlockRecord _arrowhead;

                private BlockRecord _blockContent;

                private MultiLeaderObjectContextData _contextData = new MultiLeaderObjectContextData();

                private LineType _leaderLineType = LineType.ByLayer;

                private MultiLeaderStyle _style = MultiLeaderStyle.Default;

                private TextStyle _textStyle = TextStyle.Default;

                #region Text Menu Properties

                /// <summary>
                /// Gets or sets the text alignement type.
                /// </summary>
                /// <remarks><para>
                /// The Open Design Specification for DWG documents this property as <i>Unknown</i>,
                /// DXF reference as <i>Text Aligment Type</i>.
                /// Available DWG and DXF sample documents saved by AutoCAD return always 0=Left.
                /// </para><para>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.TextAlignment"/> is
                /// assumed to be used.
                /// </para>
                /// </remarks>
                [DxfCodeValue(175)]
                public TextAlignmentType TextAlignment { get; set; }

                //        TODO How to set this value?
                /// <summary>
                /// Gets or sets a value indicating the text angle.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextAngle"/> flag is set (see
                /// <see cref="PropertyOverrideFlags"/> property).
                /// </summary>
                [DxfCodeValue(174)]
                public TextAngleType TextAngle { get; set; }

                /// <summary>
                /// Gets or sets the color for the display of the text label.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextColor"/> flag is set (see
                /// <see cref="PropertyOverrideFlags"/> property).
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.TextColor"/> is
                /// assumed to be used.
                /// </remarks>
                [DxfCodeValue(92)]
                public Color TextColor { get; set; }

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

                /// <summary>
                /// Gets or sets the text left attachment type (see <see cref="MultiLeaderStyle.TextLeftAttachment"/>).
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextLeftAttachment"/> flag is set (see
                /// <see cref="PropertyOverrideFlags"/> property).
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.TextLeftAttachment"/> is
                /// assumed to be used.
                /// </remarks>
                /// <value>
                /// A <see cref="TextAttachmentType"/> having the values 0-8 can be used
                /// ("horizontal" attachment types).
                /// </value>
                [DxfCodeValue(173)]
                public TextAttachmentType TextLeftAttachment { get; set; }

                /// <summary>
                /// Gets or sets the text right attachment type (see <see cref="MultiLeaderStyle.TextRightAttachment"/>).
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextRightAttachment"/> flag is set (see
                /// <see cref="PropertyOverrideFlags"/> property).
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.TextRightAttachment"/> is
                /// assumed to be used.
                /// </remarks>
                /// <value>
                /// A <see cref="TextAttachmentType"/> having the values 0-8 can be used
                /// ("horizontal" attachment types).
                /// </value>
                [DxfCodeValue(95)]
                public TextAttachmentType TextRightAttachment { get; set; }

                /// <summary>
                /// Gets or sets the <see cref="TextStyle"/> to be used to display the text label of this
                /// <see cref="MultiLeader"/>.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.TextStyle"/> flag is set in the
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property.
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class
                /// (<see cref="MultiLeaderObjectContextData.TextStyle"/>).
                /// Values should be equal, the <see cref="MultiLeaderObjectContextData.TextStyle"/>
                /// is assumed to be used.
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.Handle, 343)]
                public TextStyle TextStyle
                {
                        get { return this._textStyle; }
                        set
                        {
                                if (value == null)
                                {
                                        throw new ArgumentNullException(nameof(value));
                                }

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

                #endregion Text Menu Properties

                #region Block Content Properties

                /// <summary>
                /// Gets a <see cref="BlockRecord"/> containing elements
                /// to be drawn as content for the multileader.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContent"/> flag is set (see
                /// <see cref="PropertyOverrideFlags"/> property).
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.BlockContent"/> is
                /// assumed to be used.
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.Handle, 344)]
                public BlockRecord BlockContent
                {
                        get { return this._blockContent; }
                        set
                        {
                                this._blockContent = updateCollection(value, this.Document?.BlockRecords);
                        }
                }

                /// <summary>
                /// Gets or sets the block-content color.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContentColor"/> flag is set (see
                /// <see cref="PropertyOverrideFlags"/> property).
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.BlockContentColor"/> is
                /// assumed to be used.
                /// </remarks>
                [DxfCodeValue(93)]
                public Color BlockContentColor { 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
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContentConnection"/> flag is set in the
                /// <see cref="PropertyOverrideFlags"/> property.
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.BlockContentConnection"/> is
                /// assumed to be used.
                /// </remarks>
                [DxfCodeValue(176)]
                public BlockContentConnectionType BlockContentConnection { get; set; }

                /// <summary>
                /// Gets or sets the rotation of the block content of the multileader.
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.BlockContentRotation"/> is
                /// assumed to be used.
                /// </remarks>
                [DxfCodeValue(DxfReferenceType.IsAngle, 43)]
                public double BlockContentRotation { get; set; }

                /// <summary>
                /// Gets or sets the scale factor for block content.
                /// This property overrides the value from <see cref="MultiLeaderStyle"/>
                /// when the <see cref="MultiLeaderPropertyOverrideFlags.BlockContentScale"/> flag is set (see
                /// <see cref="MultiLeader.PropertyOverrideFlags"/> property).
                /// </summary>
                /// <remarks>
                /// This property is also exposed by the <see cref="MultiLeaderObjectContextData"/> class. Values
                /// should be equal, the value <see cref="MultiLeaderObjectContextData.BlockContentScale"/> is
                /// assumed to be used.
                /// </remarks>
                [DxfCodeValue(10, 20, 30)]
                public XYZ BlockContentScale { get; set; }

                #endregion Block Content Properties

                /// <inheritdoc/>
                public override void ApplyTransform(Transform transform)
                {
                }

                /// <inheritdoc/>
                public override CadObject Clone()
                {
                        MultiLeader clone = (MultiLeader)base.Clone();

                        clone._contextData = (MultiLeaderObjectContextData)this._contextData.Clone();

                        clone.BlockAttributes = new List<BlockAttribute>();
                        foreach (var att in this.BlockAttributes)
                        {
                                clone.BlockAttributes.Add((BlockAttribute)att.Clone());
                        }

                        clone._style = (MultiLeaderStyle)this._style.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;
                }

                /// <inheritdoc/>
                public override BoundingBox GetBoundingBox()
                {
                        return BoundingBox.Null;
                }

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

                        this._style = updateCollection(this._style, doc.MLeaderStyles);
                        this._textStyle = updateCollection(this._textStyle, doc.TextStyles);
                        this._leaderLineType = updateCollection(this._leaderLineType, doc.LineTypes);
                        this._arrowhead = updateCollection(this._arrowhead, doc.BlockRecords);
                        this._blockContent = updateCollection(this._blockContent, doc.BlockRecords);

                        this.ContextData.AssignDocument(doc);

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

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

                        this.ContextData.UnassignDocument();

                        base.UnassignDocument();

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

                protected override void tableOnRemove(object sender, CollectionChangedEventArgs e)
                {
                        base.tableOnRemove(sender, e);

                        if (e.Item.Equals(this._style))
                        {
                                this._style = this.Document.MLeaderStyles[MultiLeaderStyle.DefaultName];
                        }
                        if (e.Item.Equals(this._leaderLineType))
                        {
                                this._leaderLineType = this.Document.LineTypes[LineType.ByLayerName];
                        }
                        if (e.Item.Equals(this._textStyle))
                        {
                                this._textStyle = this.Document.TextStyles[TextStyle.DefaultName];
                        }
                        if (e.Item == this._arrowhead)
                        {
                                this._arrowhead = null;
                        }
                        if (e.Item == this._blockContent)
                        {
                                this._blockContent = null;
                        }
                }
        }
}

DomCR / ACadSharp / 18679832337

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