ml::Updatable Class Reference

Trait that adds per-frame update and window lifecycle callbacks to any Core object. More...

#include <Malena/Traits/Lifecycle/Updatable.h>

Inheritance diagram for ml::Updatable:

Public Member Functions
void	onUpdate (std::function< void()> callback, bool overwrite=false)
	Register a no-argument callback invoked every frame.
void	onUpdate (std::function< void(const std::optional< sf::Event > &)> callback, bool overwrite=false)
	Register a callback invoked every frame, receiving the SFML event.
void	onWindowFocusGained (std::function< void()> callback, bool overwrite=false)
	Register a no-argument callback invoked when the application window gains OS focus.
void	onWindowFocusGained (std::function< void(const std::optional< sf::Event > &)> callback, bool overwrite=false)
	Register a callback invoked when the application window gains OS focus, receiving the raw SFML event.
void	onWindowFocusLost (std::function< void()> callback, bool overwrite=false)
	Register a no-argument callback invoked when the application window loses OS focus.
void	onWindowFocusLost (std::function< void(const std::optional< sf::Event > &)> callback, bool overwrite=false)
	Register a callback invoked when the application window loses OS focus, receiving the raw SFML event.
void	onWindowResized (std::function< void()> callback, bool overwrite=false)
	Register a no-argument callback invoked when the application window is resized.
void	onWindowResized (std::function< void(const std::optional< sf::Event > &)> callback, bool overwrite=false)
	Register a callback invoked when the application window is resized, receiving the raw SFML event.
virtual void	process (const std::string &key, const std::optional< sf::Event > &event)
	Invoke all callbacks registered for key.
template<typename ENUM_TYPE>
void	process (ENUM_TYPE eventName, const std::optional< sf::Event > &event)
	Invoke all callbacks registered for eventName.

Public Attributes
Core *	_selfCore = nullptr

Detailed Description

Trait that adds per-frame update and window lifecycle callbacks to any Core object.

Updatable is automatically inherited by every ml::Core object. It provides onUpdate for per-frame logic, and three window-level event hooks that fire when the application window changes state.

Callback	Fires when
onUpdate	Every frame, before drawing
onWindowResized	The application window is resized
onWindowFocusGained	The application window gains OS focus
onWindowFocusLost	The application window loses OS focus

Usage

// Advance an animation every frame
mySprite.onUpdate([&]{
    angle += rotationSpeed;
    mySprite.setRotation(angle);
});
 
// Reflow layout when the window is resized
myPanel.onWindowResized([&](const std::optional<sf::Event>& e){
    if (auto* r = e->getIf<sf::Event::Resized>())
        myPanel.setSize({float(r->size.x), float(r->size.y)});
});

To unsubscribe:

myComp.unsubscribe(ml::Event::UPDATE);
myComp.unsubscribe(ml::Event::WINDOW_RESIZED);

See also

ml::Event::UPDATE, ml::Event::WINDOW_RESIZED, ml::Event::WINDOW_FOCUS_GAINED, ml::Event::WINDOW_FOCUS_LOST, Unsubscribable

Definition at line 60 of file Updatable.h.

Member Function Documentation

onUpdate() [1/2]

void ml::Updatable::onUpdate	(	std::function< void()>	callback,
		bool	overwrite = false )

Register a no-argument callback invoked every frame.

The callback fires once per frame before the draw pass. All active components receive this regardless of hover or focus state.

Parameters

callback	Function invoked with no arguments each frame.
overwrite	When true, replaces any existing callback; when false, appends an additional one.

onUpdate() [2/2]

void ml::Updatable::onUpdate	(	std::function< void(const std::optional< sf::Event > &)>	callback,
		bool	overwrite = false )

Register a callback invoked every frame, receiving the SFML event.

For frame events the std::optional<sf::Event> is always std::nullopt — use the no-argument overload unless you specifically need the optional parameter in your callback signature.

Parameters

callback	Function invoked with the SFML event (always nullopt) each frame.
overwrite	When true, replaces any existing callback; when false, appends an additional one.

onWindowFocusGained() [1/2]

void ml::Updatable::onWindowFocusGained	(	std::function< void()>	callback,
		bool	overwrite = false )

Register a no-argument callback invoked when the application window gains OS focus.

Parameters

callback	Function invoked with no arguments when focus is gained.
overwrite	When true, replaces any existing callback; when false, appends an additional one.

onWindowFocusGained() [2/2]

void ml::Updatable::onWindowFocusGained	(	std::function< void(const std::optional< sf::Event > &)>	callback,
		bool	overwrite = false )

Register a callback invoked when the application window gains OS focus, receiving the raw SFML event.

Parameters

callback	Function invoked with the SFML event when focus is gained.
overwrite	When true, replaces any existing callback; when false, appends an additional one.

onWindowFocusLost() [1/2]

void ml::Updatable::onWindowFocusLost	(	std::function< void()>	callback,
		bool	overwrite = false )

Register a no-argument callback invoked when the application window loses OS focus.

Parameters

callback	Function invoked with no arguments when focus is lost.
overwrite	When true, replaces any existing callback; when false, appends an additional one.

onWindowFocusLost() [2/2]

void ml::Updatable::onWindowFocusLost	(	std::function< void(const std::optional< sf::Event > &)>	callback,
		bool	overwrite = false )

Register a callback invoked when the application window loses OS focus, receiving the raw SFML event.

Parameters

callback	Function invoked with the SFML event when focus is lost.
overwrite	When true, replaces any existing callback; when false, appends an additional one.

onWindowResized() [1/2]

void ml::Updatable::onWindowResized	(	std::function< void()>	callback,
		bool	overwrite = false )

Register a no-argument callback invoked when the application window is resized.

Parameters

callback	Function invoked with no arguments on window resize.
overwrite	When true, replaces any existing callback; when false, appends an additional one.

onWindowResized() [2/2]

void ml::Updatable::onWindowResized	(	std::function< void(const std::optional< sf::Event > &)>	callback,
		bool	overwrite = false )

Register a callback invoked when the application window is resized, receiving the raw SFML event.

Parameters

callback	Function invoked with the SFML event on window resize.
overwrite	When true, replaces any existing callback; when false, appends an additional one.

process() [1/2]

virtual void ml::EventReceiver::process ( const std::string & key, const std::optional< sf::Event > & event )

virtualinherited

Invoke all callbacks registered for key.

Called by framework dispatchers. key is the string produced by EnumKey::get(eventEnum).

Parameters

key	String key identifying the event.
event	SFML event forwarded to each callback.

process() [2/2]

template<typename ENUM_TYPE>

void ml::EventReceiver::process ( ENUM_TYPE eventName, const std::optional< sf::Event > & event )

inherited

Invoke all callbacks registered for eventName.

Template overload that accepts any enum value directly, converting to a string key via EnumKey::get() internally.

Template Parameters

ENUM_TYPE

Any enum type.

Parameters

eventName	The enum value identifying the event.
event	SFML event forwarded to each callback.

Member Data Documentation

_selfCore

Core* ml::EventReceiver::_selfCore = nullptr

inherited

The owning Core, stamped by Core's constructor.

Traits subscribe from inside their OWN constructors (ml::TextInput calls onFocus(), ComponentCore subscribes to CLICK/HOVER/DRAG), at which point the derived type does not exist yet. Recovering the Core by dynamic_cast there is undefined: Clang returns something usable, MSVC throws "Access violation - no RTTI data!" and aborts the process. Core sets this on every one of its EventReceiver subobjects before any derived constructor runs, so no RTTI is ever needed.

Definition at line 93 of file EventReceiver.h.

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

• Traits/Lifecycle/Updatable.h