The central component to instantiate prefabs. More...

#include <PrefabReferenceComponent.h>

Inheritance diagram for plPrefabReferenceComponent:

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Public Member Functions
virtual void	SerializeComponent (plWorldWriter &inout_stream) const override
	Override this to save the current state of the component to the given stream.

virtual void	DeserializeComponent (plWorldReader &inout_stream) override
	Override this to load the current state of the component from the given stream.

void	SetPrefabFile (const char *szFile)

const char *	GetPrefabFile () const

void	SetPrefab (const plPrefabResourceHandle &hPrefab)

PL_ALWAYS_INLINE const plPrefabResourceHandle &	GetPrefab () const

const plRangeView< const char *, plUInt32 >	GetParameters () const

void	SetParameter (const char *szKey, const plVariant &value)

void	RemoveParameter (const char *szKey)

bool	GetParameter (const char *szKey, plVariant &out_value) const

Public Member Functions inherited from plComponent
void	SetActiveFlag (bool bEnabled)
	Sets the active flag of the component, which affects its active state.

bool	GetActiveFlag () const
	Checks whether the 'active flag' is set on this component. Note that this does not mean that the component is also 'active'.

bool	IsActive () const
	Checks whether this component is in an active state.

bool	IsActiveAndInitialized () const
	Returns whether this component is active and initialized.

bool	IsActiveAndSimulating () const
	Whether the component is currently active and simulation has been started as well.

plComponentManagerBase *	GetOwningManager ()
	Returns the corresponding manager for this component.

const plComponentManagerBase *	GetOwningManager () const
	Returns the corresponding manager for this component.

plGameObject *	GetOwner ()
	Returns the owner game object if the component is attached to one or nullptr.

const plGameObject *	GetOwner () const
	Returns the owner game object if the component is attached to one or nullptr.

plWorld *	GetWorld ()
	Returns the corresponding world for this component.

const plWorld *	GetWorld () const
	Returns the corresponding world for this component.

plComponentHandle	GetHandle () const
	Returns a handle to this component.

plUInt32	GetUniqueID () const
	Returns the unique id for this component.

void	SetUniqueID (plUInt32 uiUniqueID)
	Sets the unique id for this component.

void	EnsureInitialized ()
	Ensures that the component is initialized. Must only be called from another component's Initialize callback.

void	EnsureSimulationStarted ()
	Ensures that the OnSimulationStarted method has been called. Must only be called from another component's OnSimulationStarted callback.

PL_ALWAYS_INLINE bool	SendMessage (plMessage &ref_msg)
	Sends a message to this component.

PL_ALWAYS_INLINE bool	SendMessage (plMessage &ref_msg) const

void	PostMessage (const plMessage &msg, plTime delay=plTime::MakeZero(), plObjectMsgQueueType::Enum queueType=plObjectMsgQueueType::NextFrame) const
	Queues the message for the given phase. The message is processed after the given delay in the corresponding phase.

virtual bool	HandlesMessage (const plMessage &msg) const
	Returns whether the given Message is handled by this component.

void	SetUserFlag (plUInt8 uiFlagIndex, bool bSet)
	Be careful to check which flags may already be in use by base classes.

bool	GetUserFlag (plUInt8 uiFlagIndex) const
	Retrieves a custom flag. Index must be between 0 and 7.

void	SetCreatedByPrefab ()
	Adds plObjectFlags::CreatedByPrefab to the component. See the flag for details.

bool	WasCreatedByPrefab () const
	Checks whether the plObjectFlags::CreatedByPrefab flag is set on this component.

Public Member Functions inherited from plReflectedClass
virtual const plRTTI *	GetDynamicRTTI () const

bool	IsInstanceOf (const plRTTI *pType) const
	Returns whether the type of this instance is of the given type or derived from it.

template<typename T >
PL_ALWAYS_INLINE bool	IsInstanceOf () const
	Returns whether the type of this instance is of the given type or derived from it.

Static Public Member Functions
static void	SerializePrefabParameters (const plWorld &world, plWorldWriter &inout_stream, plArrayMap< plHashedString, plVariant > parameters)

static void	DeserializePrefabParameters (plArrayMap< plHashedString, plVariant > &out_parameters, plWorldReader &inout_stream)

Static Public Member Functions inherited from plNoBase
static const plRTTI *	GetStaticRTTI ()

Protected Member Functions
virtual void	OnActivated () override
	This method is called when the component gets activated.

virtual void	OnDeactivated () override
	This method is called when the component gets deactivated.

virtual void	Deinitialize () override
	This method is called before the component is destroyed. A derived type can override this method to do common de-initialization work.

virtual void	OnSimulationStarted () override
	This method is called once for active components, at the start of the next world update, but only when the world is simulated.

Protected Member Functions inherited from plComponent
	plComponent ()
	Keep the constructor private or protected in derived classes, so it cannot be called manually.

bool	IsDynamic () const
	Returns whether this component is dynamic and thus can only be attached to dynamic game objects.

virtual plWorldModuleTypeId	GetTypeId () const =0

virtual plComponentMode::Enum	GetMode () const =0

virtual void	Initialize ()
	Can be overridden for basic initialization that depends on a valid hierarchy and position.

void	EnableUnhandledMessageHandler (bool enable)
	By default disabled. Enable to have OnUnhandledMessage() called for every unhandled message.

virtual bool	OnUnhandledMessage (plMessage &msg, bool bWasPostedMsg)
	When EnableUnhandledMessageHandler() was activated, this is called for all messages for which there is no dedicated message handler.

virtual bool	OnUnhandledMessage (plMessage &msg, bool bWasPostedMsg) const
	When EnableUnhandledMessageHandler() was activated, this is called for all messages for which there is no dedicated message handler.

bool	IsInitialized () const

bool	IsInitializing () const

bool	IsSimulationStarted () const

Additional Inherited Members
Protected Attributes inherited from plComponent
const plRTTI *	m_pMessageDispatchType = nullptr
	Messages will be dispatched to this type. Default is what GetDynamicRTTI() returns, can be redirected if necessary.

Detailed Description

The central component to instantiate prefabs.

This component instantiates a prefab and attaches the instantiated objects as children to this object. The component is able to remove and recreate instantiated objects, which is needed at editing time. Whenever the prefab resource changes, this component re-creates the instance.

It also holds prefab parameters, which are passed through during instantiation. For that it also implements remapping of game object references, so that they can be passed into prefabs during instantiation.

Member Function Documentation

◆ Deinitialize()

void plPrefabReferenceComponent::Deinitialize ( )

overrideprotectedvirtual

This method is called before the component is destroyed. A derived type can override this method to do common de-initialization work.

This function is always called before destruction, even if the component is currently not active. The default implementation checks whether the component is currently active and will ensure OnDeactivated() gets called if necessary. For typical game code, prefer to use OnDeactivated().

See also: OnActivated(), OnDeactivated(), Initialize(), Deinitialize(), OnSimulationStarted()

Reimplemented from plComponent.

◆ DeserializeComponent()

void plPrefabReferenceComponent::DeserializeComponent ( plWorldReader & inout_stream )

overridevirtual

Override this to load the current state of the component from the given stream.

The active state will be automatically serialized. The 'initialized' state is not serialized, all components will be initialized after creation, even if they were already in an initialized state when they were serialized.

Reimplemented from plComponent.

◆ OnActivated()

void plPrefabReferenceComponent::OnActivated ( )

overrideprotectedvirtual

This method is called when the component gets activated.

By default a component is active, but it can be created in an inactive state. In such a case OnActivated() is only called once a component is activated. If a component gets switched between active and inactive at runtime, OnActivated() and OnDeactivated() are called accordingly. In contrast Initialize() and Deinitialize() are only ever called once.

See also: OnActivated(), OnDeactivated(), Initialize(), Deinitialize(), OnSimulationStarted()

Reimplemented from plComponent.

◆ OnDeactivated()

void plPrefabReferenceComponent::OnDeactivated ( )

overrideprotectedvirtual

This method is called when the component gets deactivated.

Upon destruction, a component that is active first gets deactivated. Therefore OnDeactivated() should be used for typical game code cleanup.

See also: OnActivated(), OnDeactivated(), Initialize(), Deinitialize(), OnSimulationStarted()

Reimplemented from plComponent.

◆ OnSimulationStarted()

void plPrefabReferenceComponent::OnSimulationStarted ( )

overrideprotectedvirtual

This method is called once for active components, at the start of the next world update, but only when the world is simulated.

This is the one preferred method to setup typical game logic. In a pure game environment there is no practical difference between OnActivated() and OnSimulationStarted(), as OnSimulationStarted() will be called right after OnActivated().

However, when a scene is open inside the editor, there is an important difference: OnActivated() is called once the component was created. OnSimulationStarted() is only called once the game simulation is started inside the editor. As an example, if a component starts a sound in OnActivated(), that sound will play right after the scene has been loaded into the editor. If instead the sound gets started in OnSimulationStarted(), it will only play once the user starts the game mode inside the editor.

Additionally, OnSimulationStarted() is only ever executed once on a component, even if the plWorld pauses and resumes world simulation multiple times. Thus components that should only execute a thing exactly once, will work correctly. In contrast OnActivated() and OnDeactivated() will be executed every time the component's active state is toggled, which could re-execute the same behavior multiple times.

See also: OnActivated(), OnDeactivated(), Initialize(), Deinitialize(), OnSimulationStarted()

Reimplemented from plComponent.

◆ SerializeComponent()

void plPrefabReferenceComponent::SerializeComponent ( plWorldWriter & inout_stream ) const

overridevirtual

Override this to save the current state of the component to the given stream.

Reimplemented from plComponent.

The documentation for this class was generated from the following files:

Code/Engine/Core/Prefabs/PrefabReferenceComponent.h
Code/Engine/Core/Prefabs/Implementation/PrefabReferenceComponent.cpp

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ Deinitialize()

◆ DeserializeComponent()

◆ OnActivated()

◆ OnDeactivated()

◆ OnSimulationStarted()

◆ SerializeComponent()