Implemented group highlight on hover

It's not currently stable, but it's ok for now.

grid.gd

@@ -1,4 +1,5 @@
 extends Node2D
+class_name Grid
 
 @export var rows: int = 5
 @export var cols: int = 5
@@ -8,6 +9,7 @@ extends Node2D
 
 var grid: Array[Array]
 var groups: Array
+var hovered_group: Array
 
 var debug_label: Label
 
@@ -15,7 +17,7 @@ var token = preload("res://token.tscn")
 
 func _ready():
 	debug_label = $"Debug Label"
-	
+
 	for row in rows:
 		grid.append([])
 		for column in cols:
@@ -25,13 +27,14 @@ func _ready():
 			token_node.set_type(randi_range(0,3) as Token.token_type)
 			token_node.set_debug_label(str(row) + "," + str(column))
 			token_node.token_clicked.connect(_on_token_clicked.bind([row,column]))
+			token_node.token_hovered.connect(_on_token_hovered.bind([row,column]))
 			grid[row].append(token_node)
-	
+
 	calculate_token_groups()
-			
+
 func _process(_delta: float) -> void:
 	pass
-			
+
 func _on_token_clicked(token_coord):
 	var group = get_group_of_token(token_coord)
 	if group.size() >= min_group_size:
@@ -39,24 +42,41 @@ func _on_token_clicked(token_coord):
 			var current_token = grid[coord[0]][coord[1]] as Token
 			current_token.queue_free()
 			grid[coord[0]][coord[1]] = null # do I actually want a null value or should there be some other placeholder?
-		
+
 		update_grid()
-	
-func highlight_group(group: Array):
-	pass
-			
+
+func _on_token_hovered(enter: bool, coord: Array):
+	var group = get_group_of_token(coord)
+	if enter:
+		highlight_group(group, true)
+	else:
+		highlight_group(group, false)
+
+func highlight_group(group: Array, enable: bool):
+	if group != hovered_group:
+#		Un-highlight current, update current
+		for coord in hovered_group:
+			var current_token = grid[coord[0]][coord[1]]
+			current_token.set_highlighted(false)
+
+	for coord in group:
+		var current_token = grid[coord[0]][coord[1]] as Token
+		current_token.set_highlighted(enable)
+
+	hovered_group = group
+
 func update_grid():
 	pass
-	
+
 func populate_grid():
 	pass
-	
+
 func to_grid_coord(idx):
 	pass
-	
+
 func to_index(idx):
 	pass
-	
+
 func calculate_token_groups():
 	groups = []
 	var visited_nodes = []
@@ -65,45 +85,45 @@ func calculate_token_groups():
 		for col in cols:
 			if [row, col] in visited_nodes:
 				continue
-				
+
 			group_queue.append([row,col])
-			
+
 			var new_group = []
 			while not group_queue.is_empty():
 				var current_coord = group_queue.pop_back()
 				var current_token = grid[current_coord[0]][current_coord[1]]
 				new_group.append(current_coord)
 				visited_nodes.append(current_coord)
-			
+
 				var adjacent_token_coords = [
 					[current_coord[0] - 1, current_coord[1]],
 					[current_coord[0], current_coord[1] + 1],
 					[current_coord[0] + 1, current_coord[1]],
 					[current_coord[0], current_coord[1] - 1]
 				]
-			
+
 				var valid_coords = adjacent_token_coords.filter(
-					func(coord_pair): 
+					func(coord_pair):
 						return (
-							coord_pair[0] >= 0 and 
-							coord_pair[0] < rows and 
-							coord_pair[1] >= 0 and 
+							coord_pair[0] >= 0 and
+							coord_pair[0] < rows and
+							coord_pair[1] >= 0 and
 							coord_pair[1] < cols
 						)
 				)
-			
+
 				for coord in valid_coords:
 					if (coord not in visited_nodes and
 						grid[coord[0]][coord[1]].type == current_token.type and
 						coord not in group_queue):
 						group_queue.append(coord)
 			groups.append(new_group)
-			
+
 	debug_label.text = str(groups)
 
 func get_group_of_token(token_coord) -> Array:
 	for group in groups:
 		if token_coord in group:
 			return group
-			
+
 	return []