feat: add persistent inventory storage slots

ui/components/bubble_menu/bag_storage_slot.gd

@@ -0,0 +1,72 @@
+class_name BagStorageSlot
+extends Button
+
+signal bag_item_dropped(item_id: StringName, slot_index: int)
+
+var storage_slot_index: int = -1
+var _preview: TextureRect
+
+
+func _ready() -> void:
+	focus_mode = Control.FOCUS_NONE
+	toggle_mode = false
+	mouse_default_cursor_shape = Control.CURSOR_POINTING_HAND
+	_apply_style()
+	_preview = TextureRect.new()
+	_preview.name = "PlacementPreview"
+	_preview.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
+	_preview.offset_left = 8.0
+	_preview.offset_top = 7.0
+	_preview.offset_right = -8.0
+	_preview.offset_bottom = -7.0
+	_preview.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
+	_preview.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
+	_preview.mouse_filter = Control.MOUSE_FILTER_IGNORE
+	_preview.texture_filter = CanvasItem.TEXTURE_FILTER_NEAREST
+	_preview.visible = false
+	add_child(_preview)
+
+
+func configure(slot_index: int) -> void:
+	storage_slot_index = slot_index
+	name = "BagStorageSlot%d" % slot_index
+	accessibility_name = "storage slot %d" % (slot_index + 1)
+
+
+func set_placement_preview(texture: Texture2D, active: bool) -> void:
+	if _preview == null:
+		return
+	_preview.texture = texture
+	_preview.visible = active and texture != null
+	z_index = 2 if _preview.visible else 0
+
+
+func _can_drop_data(_at_position: Vector2, data: Variant) -> bool:
+	return (
+		typeof(data) == TYPE_DICTIONARY
+		and str((data as Dictionary).get("kind", "")) == "bag_item"
+		and not str((data as Dictionary).get("item_id", "")).is_empty()
+	)
+
+
+func _drop_data(_at_position: Vector2, data: Variant) -> void:
+	if not _can_drop_data(Vector2.ZERO, data):
+		return
+	bag_item_dropped.emit(
+		StringName(str((data as Dictionary)["item_id"])),
+		storage_slot_index,
+	)
+
+
+func _apply_style() -> void:
+	var normal := UtilityPageStyle.rounded_style(
+		Color(UtilityPageStyle.OCEAN_FIELD, 0.72),
+		14,
+	)
+	var hover := UtilityPageStyle.rounded_style(
+		Color(UtilityPageStyle.OCEAN_SELECTED, 0.68),
+		14,
+	)
+	for state: StringName in [&"normal", &"pressed", &"focus", &"disabled"]:
+		add_theme_stylebox_override(state, normal)
+	add_theme_stylebox_override(&"hover", hover)

ui/components/bubble_menu/bag_storage_slot.gd.uid

@@ -0,0 +1 @@
+uid://ofac40nwf1oa