IlvConditionAccessor Class Reference

Modifies an attribute depending on a condition. More...

#include <ilviews/protos/condacc.h>

Inheritance diagram for IlvConditionAccessor:

Public Member Functions
	IlvConditionAccessor (const char *name, const IlvValueTypeClass *type, IlvDisplay *display, IlvConditionAccessorOperator op, const char *operand, const char *assignedAttribute, const char *valueIfTrue, const char *valueIfFalse=0)
	Creates a new condition accessor. More...
Public Member Functions inherited from IlvUserAccessor
	IlvUserAccessor (const char *name, const IlvValueTypeClass *type, IlUInt flags=0)
	Constructor. More...
virtual void	initialize (const IlvAccessorHolder *object)
	Attachment method to an IlvAccessorHolder. More...
virtual IlBoolean	isOutputValue (const IlSymbol *) const
	Queries if the accessor is an output accessor. More...
IlBoolean	isPrivate () const
	Checks the private status. More...
IlBoolean	isRuntime () const
	Checks the RunTime status. More...
void	setPrivate (IlBoolean val)
	Sets the Private flag of this accessor. More...
void	setRuntime (IlBoolean runTime)
	Sets the RunTime flag of this accessor. More...
Public Member Functions inherited from IlvAccessor
	IlvAccessor (const char *name, IlvValueTypeClass *type)
	Creates a new accessor of name name and type type.
virtual IlBoolean	changeValues (IlvAccessorHolder *object, const IlvValue *values, IlUShort count)
	Called by the method IlvAccessible::changeValues() for each IlvAccessor attached to the IlvAccessorHolder.
virtual void	getAccessors (const IlSymbol *const **accessors, const IlvValueTypeClass *const **types, IlUInt &count) const
	Returns the names and types of the values handled by this accessor. More...
const IlSymbol *	getName () const
	Returns the name of the accessor. More...
IlvValueTypeClass *	getType () const
	Returns the type of the accessor. More...
virtual IlBoolean	isOutputAccessor (IlBoolean &inputAndOutput)
	Queries if the accessor is an output accessor. More...
virtual IlShort	matchValues (const IlvAccessorHolder *object, const IlvValue *values, IlUShort count, IlvValue *matchingValues=0) const
	Returns the number of values that are handled by the accessor in the values array of length count. More...
virtual IlvValue &	queryValue (const IlvAccessorHolder *object, IlvValue &val) const
	Called by the method IlvAccessible::queryValue() for each IlvAccessor attached to the IlvAccessorHolder.
virtual void	queryValues (const IlvAccessorHolder *object, IlvValue *values, IlUShort count) const
	Called by the method IlvAccessible::queryValues() for each IlvAccessor attached to the IlvAccessorHolder.
void	setName (const IlSymbol *name)
	Sets the name of the accessor. More...

Protected Member Functions
virtual IlBoolean	changeValue (IlvAccessorHolder *object, const IlvValue &val)
	Called by the method IlvAccessible::changeValue() for each IlvAccessor attached to the IlvAccessorHolder.
Protected Member Functions inherited from IlvUserAccessor
virtual IlUInt	compareValues (const IlvAccessorHolder *object, const IlvAccessible *ref, IlvValue *values, IlUShort count, IlvValueArray &diffs) const
	Compares the values in ref and object and returns the differing values. More...
IlBoolean	getValue (IlvValue &val, const IlvAccessorHolder *object, IlvDisplay *display, IlvValueTypeClass *typeClass=0, IlSymbol *typeVal=0, const IlvValue *arg=0) const
	Evaluates a parameter of a user accessor. More...

Detailed Description

Modifies an attribute depending on a condition.

Library: ilvproto
For example, a condition accessor can be defined to change the foreground of an object to red when the accessor value is greater than 100. Several condition accessors can be defined with the same name, which allows several conditional side-effects to be performed.

See also

IlvTriggerAccessor.

Constructor & Destructor Documentation

IlvConditionAccessor()

IlvConditionAccessor::IlvConditionAccessor	(	const char *	name,
		const IlvValueTypeClass *	type,
		IlvDisplay *	display,
		IlvConditionAccessorOperator	op,
		const char *	operand,
		const char *	assignedAttribute,
		const char *	valueIfTrue,
		const char *	valueIfFalse = 0
	)

Creates a new condition accessor.

The accessor value is used as the left-hand side of the condition, and operand is used as the right-hand side. When the accessor value is modified, the condition is evaluated. If the result is IlTrue, the attribute specified by assignedAttribute is assigned the value valueIfTrue. If the result is IlFalse and if valueIfFalse is non-null, the attribute specified by assignedAttribute is assigned valueIfFalse. The values operand, valueIfTrue, and valueIfFalse can contain a constant value, the name of another accessor, or an arithmetic expression that can contain accessor names and/or constants (see IlvUserAccessor::getValue()).

Parameters

name	Name of the attribute.
type	Type of the attribute. Used only for initialization purposes.
display	A display used to initialize attributes that might be display-dependent.
op	Comparison operator. Can be one of: IlvCondNoOp (No comparison performed) IlvCondEqual (== test) IlvCondNotEqual (!= test) IlvCondLessThan (< test) IlvCondGreaterThan (> test) IlvCondLessOrEqual (<= test) IlvCondGreaterOrEqual (>= test) IlvCondOperator (the operand is a Boolean and its value determines the outcome).
operand	Operand against which the current attribute of name name is tested..
assignedAttribute	Attribute changed when the test is evaluated.
valueIfTrue	Value assigned to assignedAttribute if the test evaluates to IlTrue.
valueIfFalse	Value assigned to assignedAttribute if the test evaluates to IlFalse.