feat: Rewrote inventory handling basing on ESCItems (#417)

Co-authored-by: Dennis Ploeger <develop@dieploegers.de>

addons/escoria-core/library/inventory/esc_inventory_button.gd

@@ -0,0 +1,107 @@
+# The inventory representation of an ESC item if pickable (only used by
+# the inventory components)
+extends TextureButton
+class_name ESCInventoryButton
+
+
+# Signal emitted when the item was left clicked
+#
+# #### Parameters
+#
+# - item_id: Global ID of the clicked item
+signal mouse_left_inventory_item(item_id)
+
+# Signal emitted when the item was right clicked
+#
+# #### Parameters
+#
+# - item_id: Global ID of the clicked item
+signal mouse_right_inventory_item(item_id)
+
+# Signal emitted when the item was double clicked
+#
+# #### Parameters
+#
+# - item_id: Global ID of the clicked item
+signal mouse_double_left_inventory_item(item_id)
+
+# Signal emitted when the item was focused
+#
+# #### Parameters
+#
+# - item_id: Global ID of the clicked item
+signal inventory_item_focused(item_id)
+
+# Signal emitted when the item is not focused anymore
+signal inventory_item_unfocused()
+
+
+# Global ID of the ESCItem that uses this ESCInventoryItem
+var global_id: String = ""
+
+
+func _init(p_item: ESCInventoryItem) -> void:
+	global_id = p_item.global_id
+	texture_normal = p_item.texture
+	expand = true
+	stretch_mode = TextureButton.STRETCH_KEEP_ASPECT
+
+
+func _process(_delta: float) -> void:
+	rect_size = ProjectSettings.get_setting("escoria/ui/inventory_item_size")
+	rect_min_size = ProjectSettings.get_setting(
+		"escoria/ui/inventory_item_size"
+	)
+
+# Connect input handlers
+func _ready():
+	connect("gui_input", self, "_on_inventory_item_gui_input")
+	connect("mouse_entered", self, "_on_inventory_item_mouse_enter")
+	connect("mouse_exited", self, "_on_inventory_item_mouse_exit")
+
+
+# Handle the gui input and emit the respective signals
+#
+# #### Parameters
+#
+# - event: The event received
+func _on_inventory_item_gui_input(event: InputEvent):
+	if InputMap.has_action("switch_action_verb") \
+			and event.is_action_pressed("switch_action_verb"):
+		if event.button_index == BUTTON_WHEEL_UP:
+			escoria.inputs_manager._on_mousewheel_action(-1)
+		elif event.button_index == BUTTON_WHEEL_DOWN:
+			escoria.inputs_manager._on_mousewheel_action(1)
+	if event is InputEventMouseButton:
+#		var p = get_global_mouse_position()
+		if event.doubleclick:
+			if event.button_index == BUTTON_LEFT:
+				emit_signal(
+					"mouse_double_left_inventory_item", 
+					global_id, 
+					event
+				)
+		else:
+			if event.is_pressed():
+				if event.button_index == BUTTON_LEFT:
+					emit_signal(
+						"mouse_left_inventory_item", 
+						global_id, 
+						event
+					)
+				if event.button_index == BUTTON_RIGHT:
+					emit_signal(
+						"mouse_right_inventory_item", 
+						global_id, 
+						event
+					)
+
+
+# Handle mouse entering the item and send the respecitve signal
+func _on_inventory_item_mouse_enter():
+	emit_signal("inventory_item_focused", global_id)
+
+
+# Handle mouse leaving the item and send the respecitve signal
+func _on_inventory_item_mouse_exit():
+	emit_signal("inventory_item_unfocused")

addons/escoria-core/library/inventory/esc_inventory_container.gd

@@ -0,0 +1,31 @@
+# Inventory container handler that acts as a base for UIs inventory containers
+extends Control
+class_name ESCInventoryContainer
+
+
+# Get wether the inventory container currently is empty
+# **Returns** Wether the container is empty or not
+func is_empty() -> bool:
+	return get_child_count() > 0
+
+# Add a new item into the container and return the control generated for it
+# so its events can be handled by the inputs manager
+#
+# #### Parameters
+# - inventory_item: Item to add
+# **Returns** The button generated for the item
+func add_item(inventory_item: ESCInventoryItem) -> ESCInventoryButton:
+	var button = ESCInventoryButton.new(inventory_item)
+	add_child(button)
+	return button
+
+
+# Remove an item from the container
+#
+# #### Parameters
+# - inventory_item: Item to remove
+func remove_item(inventory_item: ESCInventoryItem):
+	for c in get_children():
+		if c is ESCInventoryButton and c.global_id == inventory_item.global_id:
+			remove_child(c)
+			c.queue_free()