Allow hex colour codes for lobby particles

The colour screen gets a button to type a colour as #RRGGBB or #RGB,
next to picking one of the dye colours.

LobbySystem/src/de/steamwar/lobby/LobbySystem.properties

@@ -88,6 +88,10 @@ PARTICLE_NUMBER_TYPE = §eClick to type a value
 PARTICLE_COLOR_EDITOR = §0Colours
 PARTICLE_COLOR_REMOVE = §eClick to remove
 PARTICLE_COLOR_ADD = §aAdd colour
+PARTICLE_COLOR_HEX = §eEnter hex code
+PARTICLE_COLOR_HEX_EXAMPLE = §7For example #FF8800
+PARTICLE_COLOR_HEX_TITLE = Hex colour
+PARTICLE_COLOR_HEX_INVALID = §cThat is not a hex colour like #FF8800
 PARTICLE_COLOR_RANDOM = §eUse random colours
 PARTICLE_SLOT_EMPTY = §7Empty slot
 PARTICLE_SLOT_CREATE = §eClick to create

LobbySystem/src/de/steamwar/lobby/LobbySystem_de.properties

@@ -88,6 +88,10 @@ PARTICLE_NUMBER_TYPE = §eZum Eingeben klicken
 PARTICLE_COLOR_EDITOR = §0Farben
 PARTICLE_COLOR_REMOVE = §eZum Entfernen klicken
 PARTICLE_COLOR_ADD = §aFarbe hinzufügen
+PARTICLE_COLOR_HEX = §eHex-Code eingeben
+PARTICLE_COLOR_HEX_EXAMPLE = §7Zum Beispiel #FF8800
+PARTICLE_COLOR_HEX_TITLE = Hex-Farbe
+PARTICLE_COLOR_HEX_INVALID = §cDas ist keine Hex-Farbe wie #FF8800
 PARTICLE_COLOR_RANDOM = §eZufällige Farben verwenden
 PARTICLE_SLOT_EMPTY = §7Leerer Slot
 PARTICLE_SLOT_CREATE = §eZum Erstellen klicken

LobbySystem/src/de/steamwar/lobby/particle/gui/ValueEditors.java

@@ -124,6 +124,23 @@ class ValueEditors {
                 apply.test(next);
                 reopen.run();
             }, reopen)));
+            // Same position as typing a value on the number screen
+            inventory.setItem(13, new SWItem(Material.NAME_TAG, msg("PARTICLE_COLOR_HEX", player), List.of(msg("PARTICLE_COLOR_HEX_EXAMPLE", player)), false, clickType -> {
+                SWAnvilInv anvil = new SWAnvilInv(player, msg("PARTICLE_COLOR_HEX_TITLE", player), "#");
+                anvil.setItem(Material.NAME_TAG);
+                anvil.setCallback(input -> Bukkit.getScheduler().runTask(LobbySystem.getInstance(), () -> {
+                    Color color = parseHex(input);
+                    if (color == null) {
+                        LobbySystem.getMessage().send("PARTICLE_COLOR_HEX_INVALID", player);
+                    } else {
+                        List<Color> next = new ArrayList<>(colors);
+                        next.add(color);
+                        apply.test(next);
+                    }
+                    reopen.run();
+                }));
+                anvil.open();
+            }));
         }
         inventory.setItem(RESET, new SWItem(Material.WHITE_DYE, msg("PARTICLE_COLOR_RANDOM", player), clickType -> {
             apply.test(List.of());
@@ -134,6 +151,19 @@ class ValueEditors {
         inventory.open();
     }
 
+    // Accepts #RRGGBB and #RGB, with or without the #; null for anything else
+    Color parseHex(String input) {
+        String hex = input.trim();
+        if (hex.startsWith("#")) hex = hex.substring(1);
+        if (hex.length() == 3) {
+            hex = "" + hex.charAt(0) + hex.charAt(0) + hex.charAt(1) + hex.charAt(1) + hex.charAt(2) + hex.charAt(2);
+        }
+        if (!hex.matches("[0-9a-fA-F]{6}")) {
+            return null;
+        }
+        return new Color(Integer.parseInt(hex, 16));
+    }
+
     private Material dye(Color color) {
         for (DyeColor dye : DyeColor.values()) {
             if ((dye.getColor().asRGB() & 0xFFFFFF) == (color.getRGB() & 0xFFFFFF)) {