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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<title>Castle Game Engine: X3DNodes: Class TSFNode</title>
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<h2>Castle Game Engine</h2><p><a href="introduction.html" class="navigation">Introduction</a></p><p><a href="AllUnits.html" class="navigation">Units</a></p><p><a href="ClassHierarchy.html" class="navigation">Class Hierarchy</a></p><p><a href="AllClasses.html" class="navigation">Classes, Interfaces, Objects and Records</a></p><p><a href="AllTypes.html" class="navigation">Types</a></p><p><a href="AllVariables.html" class="navigation">Variables</a></p><p><a href="AllConstants.html" class="navigation">Constants</a></p><p><a href="AllFunctions.html" class="navigation">Functions and Procedures</a></p><p><a href="AllIdentifiers.html" class="navigation">Identifiers</a></p></td><td class="content">
<a name="TSFNode"></a><h1 class="cio">Class TSFNode</h1>
<table class="sections wide_list">
<tr>
<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Hierarchy">Hierarchy</a></td><td>Fields</td><td><a class="section" href="#PasDoc-Methods">Methods</a></td><td><a class="section" href="#PasDoc-Properties">Properties</a></td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
<p class="unitlink">
<a href="X3DNodes.html">X3DNodes</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TSFNode = class(<a class="normal" href="X3DFields.TX3DSingleField.html">TX3DSingleField</a>)</code></p>
<h2 class="description">Description</h2>
<p>
VRML/X3D field holding a reference to a single node. It's defined in this unit, not in <a class="normal" href="X3DFields.html">X3DFields</a>, since it uses <a class="normal" href="X3DNodes.TX3DNode.html">TX3DNode</a> definition. NULL value of the field is indicated by Value field = nil.
<p>Note that we store AllowedChildren list, which is a list of classes allowed as a Value (also nil is always allowed). But this is used only to produce warnings for a user. You should never assert that Value actually is one the requested classes. We want to keep here even not allowed items, because we want operation "read from VRML file + write to VRML file" to be as non-destructible as possible. So if user wrote invalid class hierarchy, we will output this invalid class hierarchy.</p>
<a name="PasDoc-Hierarchy"></a><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TPersistent</li>
<li class="ancestor"><a class="normal" href="CastleInterfaces.TNonRefCountedInterfacedPersistent.html">TNonRefCountedInterfacedPersistent</a></li>
<li class="ancestor"><a class="normal" href="X3DFields.TX3DFileItem.html">TX3DFileItem</a></li>
<li class="ancestor"><a class="normal" href="X3DFields.TX3DFieldOrEvent.html">TX3DFieldOrEvent</a></li>
<li class="ancestor"><a class="normal" href="X3DFields.TX3DField.html">TX3DField</a></li>
<li class="ancestor"><a class="normal" href="X3DFields.TX3DSingleField.html">TX3DSingleField</a></li>
<li class="thisitem">TSFNode</li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-Methods"></a><h3 class="summary">Methods</h3>
<table class="summary wide_list">
<tr class="list">
<td class="visibility"><a href="legend.html"><img src="protected.gif" alt="Protected" title="Protected"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#SaveToStreamValue">SaveToStreamValue</a></b>(Writer: <a href="X3DFields.TX3DWriter.html">TX3DWriter</a>); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="protected.gif" alt="Protected" title="Protected"></a></td>
<td class="itemcode"><code>function <b><a href="X3DNodes.TSFNode.html#SaveToXmlValue">SaveToXmlValue</a></b>: <a href="X3DFields.html#TSaveToXmlMethod">TSaveToXmlMethod</a>; override;</code></td>
</tr>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>constructor <b><a href="X3DNodes.TSFNode.html#CreateUndefined">CreateUndefined</a></b>(AParentNode: <a href="X3DFields.TX3DFileItem.html">TX3DFileItem</a>; const AName: string; const AExposed: boolean); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>constructor <b><a href="X3DNodes.TSFNode.html#Create">Create</a></b>(AParentNode: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>; const AName: string; const AAllowedChildrenClasses: array of <a href="X3DNodes.html#TX3DNodeClass">TX3DNodeClass</a>; AValue: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> = nil); overload;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>constructor <b><a href="X3DNodes.TSFNode.html#Create">Create</a></b>(AParentNode: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>; const AName: string; AAllowedChildrenClasses: <a href="X3DNodes.TX3DNodeClassesList.html">TX3DNodeClassesList</a>; AValue: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> = nil); overload;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>constructor <b><a href="X3DNodes.TSFNode.html#Create">Create</a></b>(AParentNode: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>; const AName: string; AnAllowedChildrenInterface: TGUID; AValue: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> = nil); overload;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>destructor <b><a href="X3DNodes.TSFNode.html#Destroy">Destroy</a></b>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#ParseValue">ParseValue</a></b>(Lexer: <a href="X3DLexer.TX3DLexer.html">TX3DLexer</a>; Reader: <a href="X3DFields.TX3DReader.html">TX3DReader</a>); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#ParseXMLAttribute">ParseXMLAttribute</a></b>(const AttributeValue: string; Reader: <a href="X3DFields.TX3DReader.html">TX3DReader</a>); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#ParseXMLElement">ParseXMLElement</a></b>(Element: TDOMElement; Reader: <a href="X3DFields.TX3DReader.html">TX3DReader</a>); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>function <b><a href="X3DNodes.TSFNode.html#EqualsDefaultValue">EqualsDefaultValue</a></b>: boolean; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>function <b><a href="X3DNodes.TSFNode.html#Equals">Equals</a></b>(SecondValue: <a href="X3DFields.TX3DField.html">TX3DField</a>; const EqualityEpsilon: Double): boolean; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#Assign">Assign</a></b>(Source: TPersistent); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#AssignValue">AssignValue</a></b>(Source: <a href="X3DFields.TX3DField.html">TX3DField</a>); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#AssignDefaultValueFromValue">AssignDefaultValueFromValue</a></b>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>class function <b><a href="X3DNodes.TSFNode.html#TypeName">TypeName</a></b>: string; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>class function <b><a href="X3DNodes.TSFNode.html#CreateEvent">CreateEvent</a></b>(const AParentNode: <a href="X3DFields.TX3DFileItem.html">TX3DFileItem</a>; const AName: string; const AInEvent: boolean): <a href="X3DFields.TX3DEvent.html">TX3DEvent</a>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#WarningIfChildNotAllowed">WarningIfChildNotAllowed</a></b>(Child: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>);</code></td>
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<tr class="list">
<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>function <b><a href="X3DNodes.TSFNode.html#ChildAllowed">ChildAllowed</a></b>(Child: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>): boolean;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>function <b><a href="X3DNodes.TSFNode.html#CurrentChildAllowed">CurrentChildAllowed</a></b>: boolean;</code></td>
</tr>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="X3DNodes.TSFNode.html#EnumerateValid">EnumerateValid</a></b>(Func: <a href="X3DNodes.html#TEnumerateChildrenFunction">TEnumerateChildrenFunction</a>);</code></td>
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</table>
<a name="PasDoc-Properties"></a><h3 class="summary">Properties</h3>
<table class="summary wide_list">
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a href="X3DNodes.TSFNode.html#DefaultValue">DefaultValue</a></b>: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>
read FDefaultValue write SetDefaultValue;</code></td>
</tr>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a href="X3DNodes.TSFNode.html#DefaultValueExists">DefaultValueExists</a></b>: boolean
read FDefaultValueExists write SetDefaultValueExists default false;</code></td>
</tr>
<tr class="list">
<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a href="X3DNodes.TSFNode.html#Value">Value</a></b>: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> read FValue write SetValue;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a href="X3DNodes.TSFNode.html#ParentNode">ParentNode</a></b>: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> read FParentNode;</code></td>
</tr>
</table>
<h2 class="description">Description</h2>
<h3 class="detail">Methods</h3>
<table class="detail wide_list">
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<td class="visibility"><a href="legend.html"><img src="protected.gif" alt="Protected" title="Protected"></a></td>
<td class="itemcode"><a name="SaveToStreamValue"></a><code>procedure <b>SaveToStreamValue</b>(Writer: <a href="X3DFields.TX3DWriter.html">TX3DWriter</a>); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="protected.gif" alt="Protected" title="Protected"></a></td>
<td class="itemcode"><a name="SaveToXmlValue"></a><code>function <b>SaveToXmlValue</b>: <a href="X3DFields.html#TSaveToXmlMethod">TSaveToXmlMethod</a>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="CreateUndefined"></a><code>constructor <b>CreateUndefined</b>(AParentNode: <a href="X3DFields.TX3DFileItem.html">TX3DFileItem</a>; const AName: string; const AExposed: boolean); override;</code></td>
</tr>
<tr><td colspan="2">
<p>
Construct a field allowing any children class. Suitable only for special cases. For example, in instantiated prototypes, we must initially just allow all children, otherwise valid prototypes with SFNode/MFNode would cause warnings when parsing.</p>
</td></tr>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="Create"></a><code>constructor <b>Create</b>(AParentNode: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>; const AName: string; const AAllowedChildrenClasses: array of <a href="X3DNodes.html#TX3DNodeClass">TX3DNodeClass</a>; AValue: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> = nil); overload;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="Create"></a><code>constructor <b>Create</b>(AParentNode: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>; const AName: string; AAllowedChildrenClasses: <a href="X3DNodes.TX3DNodeClassesList.html">TX3DNodeClassesList</a>; AValue: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> = nil); overload;</code></td>
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<p>
Constructor that takes a list of allowed children classes. Note that we copy the contents of AAllowedChildrenClasses, not the reference.</p>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="Create"></a><code>constructor <b>Create</b>(AParentNode: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>; const AName: string; AnAllowedChildrenInterface: TGUID; AValue: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> = nil); overload;</code></td>
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<p>
Constructor that allows as children any implementor of given interface.</p>
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<td class="itemcode"><a name="Destroy"></a><code>destructor <b>Destroy</b>; override;</code></td>
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<td class="itemcode"><a name="ParseValue"></a><code>procedure <b>ParseValue</b>(Lexer: <a href="X3DLexer.TX3DLexer.html">TX3DLexer</a>; Reader: <a href="X3DFields.TX3DReader.html">TX3DReader</a>); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="ParseXMLAttribute"></a><code>procedure <b>ParseXMLAttribute</b>(const AttributeValue: string; Reader: <a href="X3DFields.TX3DReader.html">TX3DReader</a>); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="ParseXMLElement"></a><code>procedure <b>ParseXMLElement</b>(Element: TDOMElement; Reader: <a href="X3DFields.TX3DReader.html">TX3DReader</a>); override;</code></td>
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<td class="itemcode"><a name="EqualsDefaultValue"></a><code>function <b>EqualsDefaultValue</b>: boolean; override;</code></td>
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<td class="itemcode"><a name="Equals"></a><code>function <b>Equals</b>(SecondValue: <a href="X3DFields.TX3DField.html">TX3DField</a>; const EqualityEpsilon: Double): boolean; override;</code></td>
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<td class="itemcode"><a name="Assign"></a><code>procedure <b>Assign</b>(Source: TPersistent); override;</code></td>
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<td class="itemcode"><a name="AssignValue"></a><code>procedure <b>AssignValue</b>(Source: <a href="X3DFields.TX3DField.html">TX3DField</a>); override;</code></td>
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<td class="itemcode"><a name="AssignDefaultValueFromValue"></a><code>procedure <b>AssignDefaultValueFromValue</b>; override;</code></td>
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<td class="itemcode"><a name="TypeName"></a><code>class function <b>TypeName</b>: string; override;</code></td>
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<td class="itemcode"><a name="CreateEvent"></a><code>class function <b>CreateEvent</b>(const AParentNode: <a href="X3DFields.TX3DFileItem.html">TX3DFileItem</a>; const AName: string; const AInEvent: boolean): <a href="X3DFields.TX3DEvent.html">TX3DEvent</a>; override;</code></td>
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<td class="itemcode"><a name="WarningIfChildNotAllowed"></a><code>procedure <b>WarningIfChildNotAllowed</b>(Child: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>);</code></td>
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Checks is the Child allowed as a value of this SFNode, and makes <a class="normal" href="CastleWarnings.html#OnWarning">OnWarning</a> if not.
<p>Check is allowed is done looking at AllowedChildrenAll and AllowedChildren properties.
<p>Child must not be <code>Nil</code>.
<p><a class="normal" href="CastleWarnings.html#OnWarning">OnWarning</a> message will suggest that this Child is used as value of this node. In other words, you should only pass as Child a node that you want to assign as Value to this field, otherwise <a class="normal" href="CastleWarnings.html#OnWarning">OnWarning</a> message will be a little unsensible.</p>
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<td class="itemcode"><a name="ChildAllowed"></a><code>function <b>ChildAllowed</b>(Child: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>): boolean;</code></td>
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<td class="itemcode"><a name="CurrentChildAllowed"></a><code>function <b>CurrentChildAllowed</b>: boolean;</code></td>
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<td class="itemcode"><a name="EnumerateValid"></a><code>procedure <b>EnumerateValid</b>(Func: <a href="X3DNodes.html#TEnumerateChildrenFunction">TEnumerateChildrenFunction</a>);</code></td>
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Calls Func for our <a class="normal" href="X3DNodes.TSFNode.html#Value">Value</a>, assuming it's set (non-nil) and valid (allowed by <a class="normal" href="X3DNodes.TSFNode.html#ChildAllowed">ChildAllowed</a>).
<p>The main use for this is to simplify implementation of <a class="normal" href="X3DNodes.TX3DNode.html#DirectEnumerateActive">TX3DNode.DirectEnumerateActive</a> overrides in <a class="normal" href="X3DNodes.TX3DNode.html">TX3DNode</a> descendants.</p>
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<h3 class="detail">Properties</h3>
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<td class="itemcode"><a name="DefaultValue"></a><code>property <b>DefaultValue</b>: <a href="X3DNodes.TX3DNode.html">TX3DNode</a>
read FDefaultValue write SetDefaultValue;</code></td>
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Default value of SFNode field.
<p>While X3D specification says for all SFNode fields that their default value is NULL, this is not necessarily true for PROTO SFNode fiels. So we have to take into account that any <code>DefaultValue</code> is possible.
<p>Note that this doesn't have to be <code>Nil</code>, but will be irrelevant if not <a class="normal" href="X3DNodes.TSFNode.html#DefaultValueExists">DefaultValueExists</a>. (Once I had an idea to automatically set <code>DefaultValue</code> to <code>Nil</code> when <a class="normal" href="X3DNodes.TSFNode.html#DefaultValueExists">DefaultValueExists</a> is set to <code>False</code>, but this was uncomfortable (like "what to do when <code>DefaultValue</code> is assigned non-nil when <a class="normal" href="X3DNodes.TSFNode.html#DefaultValueExists">DefaultValueExists</a> is false?").)
<p>Freeing of this is automatically managed, just like the normal <a class="normal" href="X3DNodes.TSFNode.html#Value">Value</a> property. This means that you can simply set <code>DefaultValue</code> to <code>Nil</code> or some existing node, and eventual memory deallocation of previous <code>DefaultValue</code> node (if unused) will happen automatically.</p>
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<td class="itemcode"><a name="DefaultValueExists"></a><code>property <b>DefaultValueExists</b>: boolean
read FDefaultValueExists write SetDefaultValueExists default false;</code></td>
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<td class="itemcode"><a name="Value"></a><code>property <b>Value</b>: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> read FValue write SetValue;</code></td>
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<td class="itemcode"><a name="ParentNode"></a><code>property <b>ParentNode</b>: <a href="X3DNodes.TX3DNode.html">TX3DNode</a> read FParentNode;</code></td>
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VRML node containing this field. May be <code>Nil</code> if unknown, in special cases.
<p>Note that this property is exactly the same as <a class="normal" href="X3DFields.TX3DFieldOrEvent.html#ParentNode">TX3DFieldOrEvent.ParentNode</a>, contains always the same value. But this is declared as <a class="normal" href="X3DNodes.TX3DNode.html">TX3DNode</a>, so it's more comfortable.</p>
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