ActionVariablesDrawer

Custom Odin Inspector drawer for the ActionVariables container. Renders a collapsible "Variables" section in the Inspector with a header, foldout, create button, and lists of field and dynamic variables.

Definition

Namespace: Paragon.Core.ActionSystem.Editor Assembly: Paragon.Editor.dll

[DrawerPriority(0.0, 0.0, 3000.0)]
public class ActionVariablesDrawer : OdinValueDrawer<ActionVariables>

Inherits: OdinValueDrawer<ActionVariables>

Remarks

This is the root drawer for the Action Variable system in the Inspector. Every Action subclass that contains an ActionVariables field will have this drawer render the variable management UI. It delegates individual variable rendering to ActionVariableDrawer.

The drawer separates variables into two groups:

• Field variables — discovered via reflection from [Variable]-attributed fields on the Action class. Always appear first.

• Dynamic variables — created at edit-time via the ActionVariableCreateMenu. Appear below field variables, separated by a horizontal rule.

The drawer priority is set to 3000.0 (wrapper priority) to ensure it takes precedence over default drawers.

Quick Lookup

Goal	How
Add a dynamic variable	Click the + button in the "Variables" header
Expand/collapse variables	Click the foldout arrow (only visible when variables exist)
Remove a dynamic variable	Click the trash icon on the individual variable (handled by ActionVariableDrawer)

Lifecycle

Initialize

protected override void Initialize()

Called once when the drawer is first created. Sets up:

• actionVariables — the ActionVariables instance being drawn

• fieldVariablesProperty — InspectorProperty for the fieldVariables dictionary

• dynamicVariablesProperty — InspectorProperty for the dynamicVariables dictionary

• createMenu — a new ActionVariableCreateMenu bound to this drawer

• isExpanded — defaults to true

DrawPropertyLayout

protected override void DrawPropertyLayout(GUIContent label)

Main draw method called every Inspector GUI frame. Renders the full variable section.

Layout Structure

┌─────────────────────────────────────────┐
│ ▼ Variables                         [+] │  ← Header with foldout + create button
├─────────────────────────────────────────┤
│   fieldVar1    [value]     [🔗] [🗑]   │  ← Field variables (non-removable)
│   fieldVar2    [value]     [🔗] [🗑]   │
├ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┤  ← Separator (only if both groups exist)
│   dynamicVar1  [value]     [🔗] [🗑]   │  ← Dynamic variables (removable)
└─────────────────────────────────────────┘

Drawing Methods

DrawHeader

private void DrawHeader()

Renders the "Variables" header toolbar:

• If variables exist: shows a foldout toggle for expand/collapse

• If no variables exist: shows a static "Variables" label (collapsed, non-interactive)

• Always shows a + button (Odin SdfIconType.Plus) that opens the ActionVariableCreateMenu

DrawVariables

private void DrawVariables(InspectorProperty variablesProperty)

Parameter	Type	Description
variablesProperty	InspectorProperty	Either fieldVariablesProperty or dynamicVariablesProperty

Iterates over all children of the given dictionary property and draws each ActionVariable using its name as the label. Each child is accessed via child.Children[1] (the dictionary value, index 1 in a key-value pair property).

Visual Behavior

Condition	Foldout State
Has field or dynamic variables	Foldout visible, defaults expanded
No variables at all	Foldout hidden, label only
Field variables only	No separator, field list only
Dynamic variables only	No separator, dynamic list only
Both field and dynamic	Horizontal separator between groups

Common Pitfalls

Dictionary property indexing When iterating variable properties, the drawer accesses child.Children[1] to get the value side of each dictionary key-value pair. Index 0 is the key, index 1 is the value. This is an Odin serialization convention for dictionary properties.

Foldout state not persisted The isExpanded flag defaults to true on each drawer initialization and is not persisted across Inspector reloads or domain reloads.

See Also

• ActionVariableDrawer — per-variable drawer used for each item

• ActionVariableCreateMenu — popup opened by the + button

• ActionVariables — runtime container this drawer visualizes

• Action — base class that owns ActionVariables