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IlvInteractor Class Referenceabstract

Abstract base class for interactors. More...

#include <ilviews/base/inter.h>

Inheritance diagram for IlvInteractor:
IlvButtonInteractor IlvDragDropInteractor IlvGadgetInteractor IlvGaugeInteractor IlvGraphicComAdapterInteractor IlvMoveInteractor IlvMoveReshapeInteractor IlvReshapeInteractor IlvSelectorInteractor

Public Member Functions

virtual void abort (IlvGraphic *obj)
 Aborts the interactor. More...
 
virtual IlBoolean accept (const IlvGraphic *obj) const
 Indicates whether the current interactor can be associated with a given object. More...
 
virtual void endOperation ()
 Performs the actions needed when the interaction ends. More...
 
virtual void getCallbackTypes (IlUInt &count, const char *const **names, const IlSymbol *const **types) const
 Gets the number of register callback types for the interactor. More...
 
const char * getRegisteredName () const
 Returns the name of the predefined shared instance. More...
 
virtual IlBoolean handleEvent (IlvGraphic *g, IlvEvent &event, const IlvTransformer *t=0)=0
 Handles events received by the interactor. More...
 
IlBoolean isAborted () const
 Indicates whether the current interactor is in an aborted state. More...
 
IlBoolean isInOperation () const
 Indicates whether the current interactor is in an interaction state. More...
 
void lock ()
 Locks the current instance. Increments the counter that is used to know how many objects reference the current instance. More...
 
virtual void startOperation ()
 Performs the actions needed when the interaction starts. More...
 
void unLock ()
 Unlocks the current instance. Decrements the reference counter. When the counter drops down to zero, the current instance is deleted. More...
 

Static Public Member Functions

static IlvInteractorGet (const char *name, IlBoolean=IlTrue)
 Returns a predefined shared interactor instance. More...
 

Detailed Description

Abstract base class for interactors.

Library: views

This class lets you define a behavior that can be associated with an IlvGraphic object.

IlvInteractor instances can be shared between several graphic objects. Each subclass can provide a predefined shared instance that is stored in a registry. This instance can be accessed by its registered name through the IlvInteractor::Get() function. To register a predefined shared instance, you must use the IlvRegisterSharedInteractorClass() macro in the implementation file of your interactor.

Warning
Interactor instances should never be allocated on the stack as they are automatically deleted with the delete operator when they are no longer referenced (see the IlvInteractor::unLock() method).

Member Function Documentation

virtual void IlvInteractor::abort ( IlvGraphic obj)
virtual

Aborts the interactor.

The default implementation toggles the aborted flag.

See also
isAborted().
virtual IlBoolean IlvInteractor::accept ( const IlvGraphic obj) const
virtual

Indicates whether the current interactor can be associated with a given object.

Parameters
objThe considered graphic object.
Returns
IlTrue if the interactor can safely be attached to obj, and IlFalse otherwise.
See also
IlvGraphic::setInteractor().

Reimplemented in IlvGadgetInteractor, IlvGaugeInteractor, IlvSelectorInteractor, and IlvGraphicComAdapterInteractor.

virtual void IlvInteractor::endOperation ( )
virtual

Performs the actions needed when the interaction ends.

The default implementation resets the interactor flags and remove it from its parent, if it exists.

See also
IlvStackInteractorInterface::removeFromParent().

Reimplemented in IlvDragDropInteractor, and IlvMoveInteractor.

static IlvInteractor* IlvInteractor::Get ( const char *  name,
IlBoolean  = IlTrue 
)
static

Returns a predefined shared interactor instance.

This method lets you retrieve the predefined shared instance corresponding to a given interactor class.

Parameters
nameThe name under which the shared instance was registered.
Returns
The shared instance if it was found in the registry and 0 otherwise.
virtual void IlvInteractor::getCallbackTypes ( IlUInt count,
const char *const **  names,
const IlSymbol *const **  types 
) const
virtual

Gets the number of register callback types for the interactor.

If you provide a non-0 pointer to an array of strings in the parameter names, it is set on return to point to an array of strings that describe each of the callback types. Some of these descriptions may be 0. You must not modify nor delete this array.

If you provide a non-0 pointer to an array of symbols in the parameter types, it is set on return to point to an array of symbols that define each of the callback types. You must not modify nor delete this array.

If you create a new callback type and want it returned by a call to getCallbackTypes(), you can use the static member function IlvGraphic::AddToCallbackTypeList().

The default implementation registers one callback with the shared name of the interactor as symbol. For example, the IlvMoveInteractor class has a callback registered on the symbol "Move".

Parameters
countThe number of elements in the returned arrays names and types. This parameter must be set to 0 before calling this method.
namesAn array of strings.
typesAn array of symbols.
Returns
The number of register callback types for this object.

Reimplemented in IlvGadgetInteractor, and IlvMoveReshapeInteractor.

const char* IlvInteractor::getRegisteredName ( ) const

Returns the name of the predefined shared instance.

Returns the name by which the shared instance of this class is known.

Returns
The name of the predefined shared instance if it exists, 0 otherwise.
virtual IlBoolean IlvInteractor::handleEvent ( IlvGraphic g,
IlvEvent event,
const IlvTransformer t = 0 
)
pure virtual

Handles events received by the interactor.

This method is the entry point of all events dispatched to this interactor.

Parameters
gThe graphic object that receives the event.
eventThe received event.
tThe transformer applied to the view in which the event occurred.
Returns
IlTrue if the event was successfully handled and IlFalse otherwise.

Implemented in IlvGadgetInteractor, IlvGaugeInteractor, IlvDragDropInteractor, IlvMoveReshapeInteractor, IlvReshapeInteractor, IlvMoveInteractor, IlvToggleInteractor, IlvSelectorInteractor, IlvButtonInteractor, and IlvGraphicComAdapterInteractor.

IlBoolean IlvInteractor::isAborted ( ) const

Indicates whether the current interactor is in an aborted state.

Returns
Indicates whether the interactor is aborted.
IlBoolean IlvInteractor::isInOperation ( ) const

Indicates whether the current interactor is in an interaction state.

Returns
Indicates whether the interactor is in an interaction state.
void IlvInteractor::lock ( )

Locks the current instance. Increments the counter that is used to know how many objects reference the current instance.

Warning
An interactor should only be locked or unlocked if it has been allocated on the heap.
virtual void IlvInteractor::startOperation ( )
virtual

Performs the actions needed when the interaction starts.

The default implementation sets the IlvInteractorInOperation flag.

See also
isInOperation()
void IlvInteractor::unLock ( )

Unlocks the current instance. Decrements the reference counter. When the counter drops down to zero, the current instance is deleted.

Warning
An interactor should only be locked or unlocked if it has been allocated on the heap.

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