Updated to add cycle functionality and extract scroll functionality to its own class.

README.md

@@ -16,3 +16,12 @@ For example:
 ```
 java -jar RandomHotbar.jar 1:1, 2:1, 3:1.5, 4:0.75
 ```
+
+Alternatively, if you like spam-clicking to place randomized blocks, opt instead for the **cycle** option. It's used like so:
+```
+java -jar RandomHotbar.jar cycle
+```
+Using this setting, you will automatically cycle through all hotbar slots, shifting in random intervals to make sure that no patterns are introduced in the blocks you place. You can also restrict the cycle mode to the first N slots like so:
+```
+java -jar RandomHotbar.jar cycle 3
+```

src/main/java/nl/andrewl/randomhotbar/BlockPlaceListener.java

@@ -1,22 +1,16 @@
 package nl.andrewl.randomhotbar;
 
-import com.github.kwhat.jnativehook.GlobalScreen;
 import com.github.kwhat.jnativehook.mouse.NativeMouseEvent;
 import com.github.kwhat.jnativehook.mouse.NativeMouseInputListener;
-import com.github.kwhat.jnativehook.mouse.NativeMouseWheelEvent;
 
 import java.util.List;
 import java.util.Random;
-import java.util.concurrent.Executors;
-import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.TimeUnit;
 
 public class BlockPlaceListener implements NativeMouseInputListener {
 	private final Random rand = new Random();
-	private final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
 	private final List<SlotSetting> settings;
+	private final Scroller scroller;
 	private float randSum;
-	private int currentSlot = 1;
 
 	public BlockPlaceListener(List<SlotSetting> settings) {
 		randSum = 0;
@@ -30,7 +24,8 @@ public class BlockPlaceListener implements NativeMouseInputListener {
 			System.out.printf("Will use slot %d, %.1f%% of the time.\n", v.slot(), percent);
 		}
 		System.out.println("-".repeat(20));
-		System.out.printf("Starting at slot %d.\n! Please select this slot if it is not selected already, then start right-clicking.\n! Do not hold right-click.\n", currentSlot);
+		this.scroller = new Scroller(1);
+		System.out.printf("Starting at slot %d.\n! Please select this slot if it is not selected already, then start right-clicking.\n! Do not hold right-click.\n", scroller.getCurrentSlot());
 	}
 
 	private int getNextSlot() {
@@ -43,32 +38,11 @@ public class BlockPlaceListener implements NativeMouseInputListener {
 		return settings.get(Math.max(0, i - 1)).slot();
 	}
 
-	private void moveToSlot(int slot) {
-		final int dir = slot < currentSlot ? 1 : -1;
-		int n = Math.abs(currentSlot - slot);
-		for (int i = 0; i < n; i++) {
-			executor.schedule(() -> {
-				GlobalScreen.postNativeEvent(new NativeMouseWheelEvent(
-						2505,
-						0,
-						500,
-						500,
-						1,
-						NativeMouseWheelEvent.WHEEL_UNIT_SCROLL,
-						1,
-						dir,
-						NativeMouseWheelEvent.WHEEL_VERTICAL_DIRECTION
-				));
-			}, i * 50L, TimeUnit.MILLISECONDS);
-		}
-		currentSlot = slot;
-	}
-
 	@Override
 	public void nativeMouseClicked(NativeMouseEvent nativeEvent) {
 		if (nativeEvent.getButton() == 2) {
 			int newSlot = getNextSlot();
-			moveToSlot(newSlot);
+			this.scroller.moveToSlot(newSlot);
 		}
 	}
 }

src/main/java/nl/andrewl/randomhotbar/RandomHotbar.java

@@ -3,25 +3,36 @@ package nl.andrewl.randomhotbar;
 import com.github.kwhat.jnativehook.GlobalScreen;
 import com.github.kwhat.jnativehook.NativeHookException;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.CompletableFuture;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 public class RandomHotbar {
-	public static void main(String[] args) {
+	public static void main(String[] args) throws Exception {
 		try {
 			GlobalScreen.registerNativeHook();
 		} catch (NativeHookException e) {
 			e.printStackTrace();
+			System.err.println("Could not register native hooks; exiting.");
+			return;
+		}
+
+		if (args.length > 0 && args[0].equalsIgnoreCase("cycle")) {
+			doCycle(args);
+		} else {
+			var settings = parseSlotSettings(String.join(",", args));
+			var listener = new BlockPlaceListener(settings);
+			GlobalScreen.addNativeMouseListener(listener);
 		}
-		var settings = parseSettings(String.join(",", args));
-		var listener = new BlockPlaceListener(settings);
-		GlobalScreen.addNativeMouseListener(listener);
 	}
 
 	public static final Pattern SETTINGS_PATTERN = Pattern.compile("([1-9])\\s*:\\s*(\\d*\\.\\d+|\\d+)%?");
 
-	public static List<SlotSetting> parseSettings(String s) {
+	public static List<SlotSetting> parseSlotSettings(String s) {
 		List<SlotSetting> settings = new ArrayList<>(9);
 		Matcher m = SETTINGS_PATTERN.matcher(s);
 		while (m.find()) {
@@ -42,4 +53,34 @@ public class RandomHotbar {
 		}
 		return settings;
 	}
+
+	public static void doCycle(String[] args) throws Exception {
+		int slots = 9;
+		if (args.length > 1) {
+			try {
+				slots = Integer.parseUnsignedInt(args[1]);
+				if (slots < 1 || slots > 9) throw new NumberFormatException("Invalid slot count.");
+			} catch (NumberFormatException e) {
+				System.err.println("Invalid slot count. Please specify a number from 1 to 9.");
+				return;
+			}
+		}
+		System.out.println("-".repeat(20));
+		System.out.printf("Will cycle between the first %d slots.\n", slots);
+		System.out.println("-".repeat(20));
+		System.out.println("Select slot 1. Will begin in 3 seconds.");
+		Thread.sleep(3000);
+		Scroller scroller = new Scroller(1);
+		Random rand = new Random();
+		while (true) {
+			CompletableFuture<Void> cs;
+			if (scroller.getCurrentSlot() < slots) {
+				cs = scroller.incrementSlot();
+			} else {
+				cs = scroller.moveToSlot(1);
+			}
+			cs.join();
+			Thread.sleep(rand.nextLong(50, 250));
+		}
+	}
 }

src/main/java/nl/andrewl/randomhotbar/Scroller.java

@@ -0,0 +1,66 @@
+package nl.andrewl.randomhotbar;
+
+import com.github.kwhat.jnativehook.GlobalScreen;
+import com.github.kwhat.jnativehook.mouse.NativeMouseWheelEvent;
+
+import java.util.concurrent.*;
+
+public class Scroller {
+	public static final long SCROLL_DELAY_MS = 50L;
+
+	private int currentSlot;
+	private final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
+
+	public Scroller(int currentSlot) {
+		this.currentSlot = currentSlot;
+	}
+
+	public int getCurrentSlot() {
+		return this.currentSlot;
+	}
+
+	public CompletableFuture<Void> incrementSlot() {
+		int slot = this.currentSlot + 1;
+		if (slot > 9) slot = 1;
+		return moveToSlot(slot);
+	}
+
+	public CompletableFuture<Void> decrementSlot() {
+		int slot = this.currentSlot - 1;
+		if (slot < 1) slot = 9;
+		return moveToSlot(slot);
+	}
+
+	public CompletableFuture<Void> moveToSlot(int slot) {
+		int tdir = slot < currentSlot ? 1 : -1;
+		int n = Math.abs(currentSlot - slot);
+		if (n > 4) {
+			tdir *= -1;
+			n = Math.abs(9 - n);
+		}
+		final int dir = tdir;
+		CompletableFuture<Void> cs = new CompletableFuture<>();
+		for (int i = 0; i < n; i++) {
+			final int iF = i;
+			final int nF = n;
+			executor.schedule(() -> {
+				GlobalScreen.postNativeEvent(new NativeMouseWheelEvent(
+						2505,
+						0,
+						500,
+						500,
+						1,
+						NativeMouseWheelEvent.WHEEL_UNIT_SCROLL,
+						1,
+						dir,
+						NativeMouseWheelEvent.WHEEL_VERTICAL_DIRECTION
+				));
+				if (iF == nF - 1) {
+					this.currentSlot = slot;
+					cs.complete(null);
+				}
+			}, i * SCROLL_DELAY_MS, TimeUnit.MILLISECONDS);
+		}
+		return cs;
+	}
+}

src/main/java/nl/andrewl/randomhotbar/SlotSetting.java

@@ -1,4 +1,3 @@
 package nl.andrewl.randomhotbar;
 
-public record SlotSetting(int slot, float chance) {
-}
+public record SlotSetting(int slot, float chance) {}