Flow 2.3 (in works)

---

This is the upcoming release. This page is updated regularly after changes are pushed to the repository.

This release includes pull requests from the community: Bargestt (Vasilii Bulgakov), Chen-Gary (Gary Chen), dskliarov-gsc, EvanC4, LindyHopperGT (Riot Games).

This is the first release for UE 5.8, and the last for UE 5.6.

Update Notes

Critical warning for Data Pins users

If you were using Data Pins in your assets prior to Flow 2.2, do not upgrade directly from your current Flow Graph version to the version newer than 2.2. Version 2.2 came with a huge Data Pins refactor and it requires data migration occuring while loading assets.

• Update first to the Flow Graph 2.2.
• Resave all Flow Graph assets.
• Continue with updating to newer Flow Graph version.

Changed Flow Node constructor to GENERATED_BODY

This is BREAKING CHANGE. It requires updating constructors for C++ Flow Nodes. It’s simple, but it will take a few minutes for large projects.

Flow Node

• Added Paste option to the right-click menu for Flow Nodes. Formerly could only paste onto a Flow Node using Ctrl + V. (contributed by LindyHopperGT)
• Added Attach AddOn drop-down to Flow Node (and AddOn) details. Adds a more convenient method for attaching addons that is fewer-clicks per operation and a bit less hidden. This is in addition to the right-click menu on these nodes. (contributed by LindyHopperGT)
• Setting UFlowNode pointer on AddOns more reliably in editor. Updated the node pointer in editor for AddOns so that it is usable any time while in editor, can updated when addons are moved/rebuilt. (contributed by LindyHopperGT)
• Updated Flow Palette filters. (contributed by LindyHopperGT)
  • Improved the Flow Palette filtering by category to also check superclasses of the UFlowAsset subclass being edited.
  • The palette filtering can apply a strict or tentative result, as it crawls up the superclass lineage.
• Refactored the IsInput/OutputConnected interface to be more useful & pin connection change event improvements.
  • These new function signatures provide multiple connections when present, and also have FConnectedPin structs as their container Updated existing calls to these functions to use the new signatures.
  • Augmented the event for OnConnectionsChanged to have an array of changed connections instead of the old connections array.
  • This new version OnEditorPinConnectionsChanged is called on all of the addons on a Flow Node as well, and has a blueprint signature.
  • This change allows nodes to be more reactive to pin connections changing (like changing their Config Text), which was possible before, but not smooth.
  • Updated some Flow Nodes (Log, FormatText) to update their config text on pin connection changes.

Specific Flow Nodes

• UFlowNode_Reroute (contributed by LindyHopperGT)
  • Reroute nodes can now retype themselves if connected to a new type (and in doing so, break incompatible connections).
  • Copy/paste for data pin reroutes preserves the type of the reroute (was being lost).
• Fixed ExecutionLimit in FlowNode_LogicalOR. Surprisingly, it wasn’t working with ExecutionLimit higher than 1. (contributed by Chen-Gary)
• UFlowNode_FormatText
  • Fixed crash: prevent Getting the value of an invalid FFlowDataPinValue property. (contributed LindyHopperGT)
  • Fixed node not supporting the Format Text input connection. (contributed by dskliarov-gsc)
• Added PredicateRequireGameplayTags AddOn: a data pin version. Blackboard version lives in AIFlowGraph plugin. (contributed by LindyHopperGT)
• Added CompareValues predicate (for data pins) and auto-generate data pins refactor. (contributed by LindyHopperGT)
  • Refactored the auto-generate data pins code so that the CompareValues predicate can get its pins generated, duplicates disambiguated and the results queried.
  • Created CompareValues predicate, which is analogous to the Compare Blackboard Values predicate, but for data pins.

Flow Asset

• Fixed: assets didn’t show dirty and version control statuses. (contributed by Bargestt)
• Fixed dirtying graph on copy. (contributed by Bargestt)
• Fix invalid instance class when pasting. (contributed by Bargestt)
• Refactored LogError/LogWarning/LogNote. Extracted shared LogRuntimeMessage() helper. Three identical copy-pasted functions → one implementation with severity parameter. (contributed by LindyHopperGT, improved by Bargestt)
• Fixed TryFindActorOwner() to correctly return the Owner when it is already an AActor, not just when it’s a component. Fulfills the documented contract. (contributed by LindyHopperGT)
• Crash fix in CancelAndWarnForUnflushedDeferredTriggers(). Null-guard ToNode and FromNode before dereferencing in UE_LOG. Prevents crash during abnormal termination when nodes are already destroyed. (contributed by LindyHopperGT)
• Introduced FFlowPolicy instanced-struct policy meant to handle various project-specific policies. Refactored Pin Connection policy to use it. (contributed by LindyHopperGT)

SaveGame support

• Refactored SaveGame integration to allow for arbitrary save data container objects. (inspired by gregorhcs)
  • Added variants of OnGameSaved and OnGameLoaded: accepting TArray<FFlowComponentSaveData> and TArray<FFlowAssetSaveData> as input parameters.
  • Added creating a transient UFlowSaveGame object in the new OnGameLoaded variant. This way, the plugin can keep operating on UFlowSaveGame as a container for these 2 arrays, but projects can store these arrays whenever they want.
  • Refactored input parameters of GetLoadedComponentRecord and GetLoadedAssetRecord for easier integration with project-specific save systems. (contributed by Bargestt)
• Added CanSave check to UFlowComponent. Allows for transient Flow graphs and components that are never saved. (contributed by Bargestt)

Misc

• Fixed one of UFlowSubsystem::FindComponents variants which could return no components if method has been called with the following parameters: EGameplayContainerMatchType::All and bExactMatch = false. (contributed by Bargestt)
• In UFlowGraphSettings, all occurences of hard refences TSubclassOf have been changed to TSoftClassPtr. In general, TSubclassOf should be avoided to prevent automatic loading of unnecessary assets. In case of plugins, using hard reference was using issue with loading some assets defined in other plugins. Since UFlowGraphSettings could load assets before other plugin is loaded. (contributed by Chen-Gary)
• Fix crash when OnMapOpened delegate fires after SLevelEditorFlow destruction. (contributed by EvanC4)