From 84c21cc85d59afd0ca44c4ec9473cab701ed1e62 Mon Sep 17 00:00:00 2001
From: Almas Baim <almaslvl@gmail.com>
Date: Sat, 28 Dec 2024 08:39:24 +0000
Subject: [PATCH] clean up VarChangeSample and move out of sandbox

---
 .../VarChangeSample.java                      | 58 ++++++++++---------
 1 file changed, 32 insertions(+), 26 deletions(-)
 rename fxgl-samples/src/main/java/{sandbox => intermediate}/VarChangeSample.java (50%)

diff --git a/fxgl-samples/src/main/java/sandbox/VarChangeSample.java b/fxgl-samples/src/main/java/intermediate/VarChangeSample.java
similarity index 50%
rename from fxgl-samples/src/main/java/sandbox/VarChangeSample.java
rename to fxgl-samples/src/main/java/intermediate/VarChangeSample.java
index 9698f0d5f..ecdd825f2 100644
--- a/fxgl-samples/src/main/java/sandbox/VarChangeSample.java
+++ b/fxgl-samples/src/main/java/intermediate/VarChangeSample.java
@@ -4,11 +4,10 @@
  * See LICENSE for details.
  */
 
-package sandbox;
+package intermediate;
 
 import com.almasb.fxgl.app.GameApplication;
 import com.almasb.fxgl.app.GameSettings;
-import javafx.scene.input.KeyCode;
 import javafx.util.Duration;
 
 import java.util.Map;
@@ -16,23 +15,15 @@
 import static com.almasb.fxgl.dsl.FXGL.*;
 
 /**
- * @author Almas Baimagambetov (AlmasB) (almaslvl@gmail.com)
+ * Shows how to listen for changes in variables and react.
+ *
+ * @author Almas Baim (https://github.com/AlmasB)
  */
 public class VarChangeSample extends GameApplication {
 
     @Override
     protected void initSettings(GameSettings settings) { }
 
-    @Override
-    protected void initInput() {
-        onKeyDown(KeyCode.F, "update", () -> {
-            inc("time", +1.0);
-
-            var name = gets("name");
-            set("name", name + "H");
-        });
-    }
-
     @Override
     protected void initGameVars(Map<String, Object> vars) {
         vars.put("hp", 0);
@@ -42,29 +33,44 @@ protected void initGameVars(Map<String, Object> vars) {
 
     @Override
     protected void initGame() {
-        // the event builder way
-        eventBuilder()
-                .when(() -> geti("hp") == 7)
-                .limit(4)
-                .thenRun(() -> System.out.println("hello"))
-                .buildAndStart();
-
-        // the DSL way
+        // the DSL way, if you need something set up quickly
         onDoubleChange("time", value -> {
-            System.out.println(value);
+            System.out.println("The var <time> is now: " + value);
         });
 
         onStringChange("name", value -> {
-            System.out.println(value);
+            System.out.println("The var <name> is now: " + value);
         });
 
         onStringChangeTo("name", "HelloHH", () -> {
-            System.out.println("bye");
+            System.out.println("The var <name> reached HelloHH");
         });
 
-        onIntChangeTo("hp", 5, () -> System.out.println("Hello"));
+        onIntChangeTo("hp", 5, () -> {
+            System.out.println("The var <hp> reached 5");
+        });
+
+        // the event builder way, if you need more control over execution
+        eventBuilder()
+                .when(() -> geti("hp") == 7)
+                .limit(4)
+                .thenRun(() -> System.out.println("The <hp> var reached 7. You will see this message 4 times"))
+                .buildAndStart();
+
+        // the listener way, if you want to control lifecycle / clean-up process
+        getip("hp").subscribe((oldValue, newValue) -> {
+            if (newValue.intValue() == 4) {
+                System.out.println("The var <hp> reached 4");
+            }
+        });
+
+        run(() -> {
+            inc("hp", +1);
+            inc("time", +1.0);
+
+            set("name", gets("name") + "H");
 
-        run(() -> inc("hp", +1), Duration.seconds(1));
+        }, Duration.seconds(1));
     }
 
     public static void main(String[] args) {