Adding simple dialog system

game/scenes/UI/dialog_system.gd

@@ -0,0 +1,146 @@
+extends CanvasLayer
+
+var _interactables: Array[Node] = []
+var _active_interactable: Node = null
+var _dialog_visible := false
+
+var _prompt_label: Label
+var _dialog_panel: PanelContainer
+var _dialog_label: RichTextLabel
+
+func _ready() -> void:
+	layer = 50
+	process_mode = Node.PROCESS_MODE_ALWAYS
+	_setup_ui()
+	_set_dialog_visible(false)
+	_update_prompt_visibility()
+
+
+func _process(_delta: float) -> void:
+	if Input.is_action_just_pressed("interact"):
+		if _dialog_visible:
+			_set_dialog_visible(false)
+			return
+		if _active_interactable != null:
+			_open_dialog_for(_active_interactable)
+
+
+func register_interactable(interactable: Node) -> void:
+	if interactable == null:
+		return
+	if _interactables.has(interactable):
+		return
+	_interactables.append(interactable)
+	_refresh_active_interactable()
+
+
+func unregister_interactable(interactable: Node) -> void:
+	if interactable == null:
+		return
+	_interactables.erase(interactable)
+	if _active_interactable == interactable and _dialog_visible:
+		_set_dialog_visible(false)
+	_refresh_active_interactable()
+
+
+func _refresh_active_interactable() -> void:
+	while _interactables.size() > 0 and not is_instance_valid(_interactables[_interactables.size() - 1]):
+		_interactables.pop_back()
+	_active_interactable = _interactables[_interactables.size() - 1] if _interactables.size() > 0 else null
+	if _dialog_visible and _active_interactable != null:
+		_dialog_label.text = _get_dialog_text(_active_interactable)
+	_update_prompt_visibility()
+
+
+func _open_dialog_for(interactable: Node) -> void:
+	if _dialog_label:
+		_dialog_label.text = _get_dialog_text(interactable)
+	_set_dialog_visible(true)
+
+
+func show_text(text: String) -> void:
+	if _dialog_label:
+		_dialog_label.text = text
+	_set_dialog_visible(true)
+
+
+func close_if_text(expected_text: String) -> void:
+	if not _dialog_visible:
+		return
+	if _dialog_label == null:
+		return
+	if _dialog_label.text != expected_text:
+		return
+	_set_dialog_visible(false)
+
+
+func _set_dialog_visible(dialog_open: bool) -> void:
+	_dialog_visible = dialog_open
+	if _dialog_panel:
+		_dialog_panel.visible = _dialog_visible
+	_update_prompt_visibility()
+
+
+func _update_prompt_visibility() -> void:
+	if _prompt_label == null:
+		return
+	var has_active := _active_interactable != null
+	_prompt_label.visible = has_active and not _dialog_visible
+	if _prompt_label.visible:
+		_prompt_label.text = _get_prompt_text(_active_interactable)
+
+
+func _get_prompt_text(interactable: Node) -> String:
+	if interactable == null:
+		return ""
+	if interactable.has_method("get_dialog_prompt"):
+		return String(interactable.call("get_dialog_prompt"))
+	return "Press E to interact"
+
+
+func _get_dialog_text(interactable: Node) -> String:
+	if interactable == null:
+		return ""
+	if interactable.has_method("get_dialog_text"):
+		return String(interactable.call("get_dialog_text"))
+	return "..."
+
+
+func _setup_ui() -> void:
+	var root := Control.new()
+	root.name = "DialogRoot"
+	root.set_anchors_preset(Control.PRESET_FULL_RECT)
+	root.mouse_filter = Control.MOUSE_FILTER_IGNORE
+	add_child(root)
+
+	_prompt_label = Label.new()
+	_prompt_label.name = "PromptLabel"
+	_prompt_label.set_anchors_preset(Control.PRESET_CENTER_BOTTOM)
+	_prompt_label.offset_left = -140.0
+	_prompt_label.offset_top = -64.0
+	_prompt_label.offset_right = 140.0
+	_prompt_label.offset_bottom = -36.0
+	_prompt_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
+	_prompt_label.mouse_filter = Control.MOUSE_FILTER_IGNORE
+	_prompt_label.text = "Press E to interact"
+	root.add_child(_prompt_label)
+
+	_dialog_panel = PanelContainer.new()
+	_dialog_panel.name = "DialogPanel"
+	_dialog_panel.visible = false
+	_dialog_panel.set_anchors_preset(Control.PRESET_CENTER_BOTTOM)
+	_dialog_panel.offset_left = -300.0
+	_dialog_panel.offset_top = -220.0
+	_dialog_panel.offset_right = 300.0
+	_dialog_panel.offset_bottom = -80.0
+	_dialog_panel.mouse_filter = Control.MOUSE_FILTER_IGNORE
+	root.add_child(_dialog_panel)
+
+	_dialog_label = RichTextLabel.new()
+	_dialog_label.name = "DialogText"
+	_dialog_label.custom_minimum_size = Vector2(560.0, 120.0)
+	_dialog_label.fit_content = true
+	_dialog_label.scroll_active = false
+	_dialog_label.bbcode_enabled = true
+	_dialog_label.text = ""
+	_dialog_panel.add_child(_dialog_label)

game/scenes/UI/dialog_system.gd.uid

@@ -0,0 +1 @@
+uid://be24usagr8kml