FCoreDelegates

Get a hotfix delegate

Called to request that systems free whatever memory they are able to.

Called when OOM event occurs, after backup memory has been freed, so there's some hope of being effective.

Callback to let code read or write specialized binary data that is generated at Stage time, for optimizing data right before final game data is being written to disk The TMap is a map of an identifier for owner of the data, and a boolean where true means the data is being generated (ie editor), and false means the data is for use (ie runtime game)

IOS-style temperature updates, allowing game to scale down to let temp drop (to avoid thermal throttling on mobile, for instance)

Called when an application is notified that the application license info has been updated.

IOS-style application lifecycle delegates

Called when the application's network initializes or shutdowns on platforms where the network stack is not always available

Sent when a device screen orientation changes

IOS-style push notification delegates

Generally, events triggering UserMusicInterruptDelegate or AudioMuteDelegate happen only when a change occurs.

[iOS only] Called when the mute switch is detected as changed or when the volume changes.

[iOS only] Called when the audio device changes For instance, when the headphones are plugged in or removed

Called when in the background, if the OS is giving CPU time to the device.

Sent when GConfig is finished initializing

Delegate for gathering up additional localization paths that are unknown to the UE4 core (such as plugins)

Called when displaying on screen messages (like the "Lighting needs to be rebuilt"), to let other systems add any messages as needed Sample Usage: void GetMyOnScreenMessages(FCoreDelegates::FSeverityMessageMap& OutMessages) { OutMessages.Add(FCoreDelegates::EOnScreenMessageSeverity::Info, FText::Format, SomeStatus)); }

Hot fix delegate

Delegate type for prompting the pak system to mount a new pak

After a file is added this is called.

Delegate to let other systems no that no paks were mounted, in case something wants to handle that case

Callback for object property modifications.

Callback for platform handling when flushing async loads.

Callback for a game thread interruption point when a async load flushing. Used to updating UI during long loads.

Callback on the game thread when an async load is started. This goes off before the packages has finished loading.

Sent by application code to set params that customize crash reporting behavior.

Called when a feature level is disabled by the user.

When a file is opened for read from a pak file.

Sent when application code changes the currently active game session.

Sent when application code changes game state.

Sent when GC finish destroy takes more time than expected

Callback for handling an ensure.

Callback for handling an error.

Callback for handling accepting invitations - generally for engine code.

Sent by engine code when the "vanilla" status of the engine changes

Called when the verbosity of a log category is changed

Called when the OS goes into low power mode

Delegate type for opening a modal message box ( Params: EAppMsgType::Type MessageType, const FText& Text, const FText& Title )

Delegate type for prompting the pak system to mount all pak files, which haven't already been mounted, from all default locations

Deprecated delegate type for prompting the pak system to mount a new pak

Delegate type for prompting the pak system to optimize memory for mounted paks

Deprecated delegate for handling when a new pak file is successfully mounted passes in the name of the pak file and its chunk ID (or INDEX_NONE)

Delegate for handling when a new pak file is successfully mounted

Callback for platform specific very early init code.

Callback for handling safe frame area size changes.

Called when a target platform changes it's return value of supported formats. This is so anything caching those results can reset (like cached shaders for cooking)

Delegate type for prompting the pak system to unmount a pak

Sent when application code changes the user activity hint string for analytics, crash reports, etc

Callback for handling the Controller connection / disconnection first param is true for a connection, false for a disconnection.

Callback for handling a Controller pairing change first param is controller index second param is NewUserPlatformId, third is OldUserPlatformId.

Callback for handling user login/logout. first int is UserID, second int is UserIndex.

Callback for accessing pak encryption key, if it exists.

Deprecated delegate for handling when a new pak file is successfully mounted passes in the name of the mounted pak file

Callback for gathering pak signing keys, if they exist.

Sent when the platform changed its laptop mode (for convertible laptops).

Callback for registering a new encryption key.

Delegate used to register a movie streamer with any movie player modules that bind to this delegate.

Callback for notifications regarding changes of the rendering thread.

Callback to allow custom resolution of package names.

Callback to allow user code to prevent url from being launched from FPlatformProcess::LaunchURL.

Called when the main loop would otherwise starve.

Checks to see if the stat is already enabled

Sent when all stats need to be disabled

Sent after each stat is disabled

Sent after each stat is enabled

Delegate used to un-register a movie streamer with any movie player modules that bind to this delegate.

Called when the OS needs control of the music (parameter is true) or when the OS returns control of the music to the application (parameter is false).

Sent when a 3DOF VR controller is recentered

Sent when connection to VR HMD connection is refused by the player

Sent when connection to VR HMD is lost

Sent when the VR HMD detects that it has been put on by the player.

Sent when the platform requests a low-level VR recentering

Sent when connection to VR HMD is restored

Sent when the VR HMD detects that it has been taken off by the player.

Sent when the platform finds that needed headset tracking on startup has completed (PS4 Morpheus only)

Sent when the platform needs the user to fix headset tracking on startup (PS4 Morpheus only)

Called when the application receives notice that a background download has completed

Called when the application fails to register for remote notifications

Called when the application is returning to the foreground (reverse any processing done in the EnterBackground delegate)

Called when the application has been reactivated (reverse any processing done in the Deactivate delegate)

Called when the application receives notice to perform a background fetch

Called when the application receives a local notification

Called when the application receives a remote notification

Called with arguments passed to the application on statup, perhaps meta data passed on by another application which launched this one.

Called when the user grants permission to register for remote notifications

Called when the user grants permission to register for notifications

Called when the OS is running low on resources and asks the application to free up any cached resources, drop graphics quality etc.

This is called when the application is about to be deactivated (e.g., due to a phone call or SMS or the sleep button).

This is called when the application is being backgrounded (e.g., due to switching to another app or closing it via the home button) The game should release shared resources, save state, etc..., since it can be terminated from the background state without any further warning.

This may be called when the application is getting terminated by the OS.

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Callbacks for hotfixes.

Requests to open a message box

Callback to prompt the pak system to mount a pak file.

After an attempt to mount all pak files, but none wre found, this is called.

Called when an actor label is changed.

Called at the beginning of a frame.

Called at the beginning of a frame on the renderthread.

Callback when controllers disconnected / reconnected.

Callback when a single controller pairing changes.

Called at the end of a frame.

Called at the end of a frame on the renderthread.

Called before the engine exits. Separate from OnPreExit as OnEnginePreExit occurs before shutting down any core modules.

Called when the application is about to exit.

Called at the very end of engine initialization, right before the engine starts ticking. This is not called for commandlets.

Callback when an ensure has occurred.

Callback when an error (crash) has occurred.

Called when appInit is called, very early in startup.

Called when the user accepts an invitation to the current game

Callback for mounting all the pak files in default locations.

Callback to optimize memeory for currently mounted paks.

After a pakfile is mounted this is called.

Called at the end of UEngine::Init, right before loading PostEngineInit modules for both normal execution and commandlets.

Called when before the application is exiting.

Callback when a user changes the safe frame size.

Called at the moment of sampling the input (currently on the gamethread)

Called when an error occurred.

Callback to prompt the pak system to unmount a pak file.

Callback when a user logs in/out of the platform.

Called after the editor dismisses a modal window, allowing other windows the opportunity to disable themselves to avoid reentrant calls.

Sent just after the rendering thread has been created.

Called after the editor dismisses a Slate (non-platform) modal window, allowing other windows the opportunity to disable themselves to avoid reentrant calls.

Called after world origin shifting

Called before the editor displays a modal window, allowing other windows the opportunity to disable themselves to avoid reentrant calls.

Sent just before the rendering thread is destroyed.

Called before the editor displays a Slate (non-platform) modal window, allowing other windows the opportunity to disable themselves to avoid reentrant calls.

Called before world origin shifting

Delegate used to register a movie streamer with any movie player modules that bind to this delegate Designed to be called when a platform specific movie streamer plugin starts up so that it doesn't need to implement a register for all movie player plugins

Delegate used to un-register a movie streamer with any movie player modules that bind to this delegate Designed to be called when a platform specific movie streamer plugin shuts down so that it doesn't need to implement a register for all movie player plugins

FCoreDelegates::GetRegisterEncryptionKeyDelegate is deprecated; use GetRegisterEncryptionKeyMulticastDelegate instead