Class TX3DSimpleMultField

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This item has no description. Showing description inherited from TX3DField.CreateUndefined.

Main constructor that initializes field when default value is not known.

It is virtual, so you can use it to construct field instance when field class is known only at runtime. For example you can have variable like "FieldClass: TX3DFieldClass" and use it to construct the field instance. Such field can be later initialized e.g. using Parse.

Note: Two exceptional VRML 1.0 fields simply cannot work when initialized by this constructor: TSFEnum and TSFBitMask . They simply need to know their TSFEnum.EnumNames, or TSFBitMask.FlagNames + TSFBitMask.NoneString + TSFBitMask.AllString before they can be parsed. Luckily these fields have been removed in VRML 2.0 and X3D so we don't need to support them e.g. in VRML 2.0 and X3D prototypes.

Descendants implementors:

1. Descendants should override this virtual constructor, CreateUndefined, to do all obligatory initialization work (e.g. create some internal TStringList).

Call "inherited" at the beginning of the implementation of this overridden "CreateUndefined".

2. Can Create also a convenience non-virtual constructor Create, that takes as parameter initial value (with type specific to given field, e.g. Integer for TSFInt32).

This convenience constructor should call "CreateUndefined" (not "inherited Create" or "inherited CreateUndefined"!) at the beginning.

TODO: Rename this to just Create, to obscure parent Create. After everything migrated to calling CreateUndefined.

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Copy another field value, default value and other properties.

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Copies the current field value. Contrary to TPersistent.Assign, this doesn't copy the rest of properties.

After setting, our ValueFromIsClause is always changed to False. You can manually change it to True, if this copy indeed was done following "IS" clause.

Descendants implementors notes:

In this class, implementation takes care of setting our ValueFromIsClause to False. In descendants, you should do like

if Source is <appropriate class> then
begin
  inherited;
  Value := Source.value;
end else
  AssignValueRaiseInvalidClass(Source);

This item has no description. Showing description inherited from TX3DField.AssignDefaultValueFromValue.

Set field's default value from the current value.

Note that for now this doesn't guarantee that every possible field's value can be stored as default value. In case of trouble, it will silently record "no default is known" information, so e.g. EqualsDefaultValue will always return False. Our default value mechanisms are sometimes limited, not every value can be a default value. For example, for multiple-valued nodes, we usually cannot save arrays longer than one as default value. This is not a problem, since X3D specification doesn't specify too long default values. But it may be a problem for prototypes, since then user can assign any value as default value. May be corrected in the future.

This item has no description. Showing description inherited from TX3DField.UnassignDefaultValue.

Remove default value, recording that "no default is known". In effect EqualsDefaultValue will always return False.

Parse MF field. This class handles parsing fully, usually no need to override this more in descendants. It uses TSingleField.Parse method.

Checks equality between this and SecondValue field. In addition to inherited(Equals), this checks the actual contents of the items. Note that floating-point values are compared with some tolerance for errors by this method.

This item has no description. Showing description inherited from TX3DField.EqualsDefaultValue.

Whether the value is equal to default. Returns always False in TX3DField, descendants should override it. It is used when writing the field value to X3D file (values that are default do not have to be written, ever).

This item has no description. Showing description inherited from TX3DField.ParseXMLAttributeLexer.

Parse field value from X3D XML encoded attribute using a Lexer. Attributes in X3D are generally encoded such that normal ParseValue(Lexer, nil) call is appropriate, so this is done in this class.

Set the field's value in a correct way (by sending X3D event, or at least notifying the parent scene).

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Access items, making nice warning in case of an invalid index. In case of an invalid index, getting will return default value (filled with zeroes), setting will do nothing, and both will emit user-friendly WritelnWarning.