fxgl-variables-events

Manage reactive game state in FXGL — declare typed world variables in initGameVars, read/write/increment them via DSL, bind JavaFX UI properties to live variable values, register property-change listeners triggered at specific thresholds, fire and subscribe to custom events on the EventBus, use the built-in game timer (runOnce, runAtInterval), and create offline timers that persist between sessions. Use this skill when tracking score, lives, time, game flags, wiring HUD to game state, implementing event-driven logic, or scheduling delayed/recurring actions.

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Repository: JohannesRabauer/fxgl-skills
Last source activity: June 4, 2026 at 06:53
Detected SKILL.md language: English
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FXGL Variables & Events

Declaring Variables

All variables must be declared in initGameVars. FXGL creates strongly-typed Property objects for each entry — use them for reactive UI bindings.

@Override protected void initGameVars(Map<String, Object> vars) { vars.put("score", 0); // → IntegerProperty vars.put("lives", 3); // → IntegerProperty vars.put("health", 100.0); // → DoubleProperty vars.put("hasShield", false); // → BooleanProperty vars.put("playerName", "Hero"); // → StringProperty vars.put("currentLevel", 1); // → IntegerProperty vars.put("inventory", new ArrayList<Item>()); // → ObjectProperty<T> }

Reading & Writing at Runtime

// Read int score = geti("score"); double hp = getd("health"); boolean shield = getb("hasShield"); String name = gets("playerName"); List<Item> inv = geto(); set(, ); set(, ); set(, ); inc(, +); inc(, -); inc(, +);