Initial commit, layout mockup

addons/dockable_container/inspector_plugin/editor_inspector_plugin.gd

@@ -0,0 +1,22 @@
+extends EditorInspectorPlugin
+
+const LayoutEditorProperty := preload("layout_editor_property.gd")
+
+
+func _can_handle(object: Object) -> bool:
+	return object is DockableContainer
+
+
+func _parse_property(
+	_object: Object,
+	_type: Variant.Type,
+	name: String,
+	_hint: PropertyHint,
+	_hint_text: String,
+	_usage: int,
+	_wide: bool
+) -> bool:
+	if name == "layout":
+		var editor_property := LayoutEditorProperty.new()
+		add_property_editor("layout", editor_property)
+	return false

addons/dockable_container/inspector_plugin/layout_editor_property.gd

@@ -0,0 +1,71 @@
+extends EditorProperty
+
+var _container := DockableContainer.new()
+var _hidden_menu_button := MenuButton.new()
+var _hidden_menu_popup: PopupMenu
+var _hidden_menu_list: PackedStringArray
+
+
+func _ready() -> void:
+	custom_minimum_size = Vector2(128, 256)
+
+	_hidden_menu_button.text = "Visible nodes"
+	add_child(_hidden_menu_button)
+	_hidden_menu_popup = _hidden_menu_button.get_popup()
+	_hidden_menu_popup.hide_on_checkable_item_selection = false
+	_hidden_menu_popup.about_to_popup.connect(_on_hidden_menu_popup_about_to_show)
+	_hidden_menu_popup.id_pressed.connect(_on_hidden_menu_popup_id_pressed)
+
+	_container.clone_layout_on_ready = false
+	_container.custom_minimum_size = custom_minimum_size
+
+	var value := _get_layout().clone()  # The layout gets reset when selecting it without clone
+	for n in value.get_names():
+		var child := _create_child_control(n)
+		_container.add_child(child)
+	_container.set(get_edited_property(), value)
+	add_child(_container)
+	set_bottom_editor(_container)
+
+
+func _exit_tree() -> void:  # Not sure if this is needed, but just to be sure
+	queue_free()
+
+
+func _update_property() -> void:
+	var value := _get_layout()
+	_container.set(get_edited_property(), value)
+
+
+func _get_layout() -> DockableLayout:
+	var original_container := get_edited_object() as DockableContainer
+	return original_container.get(get_edited_property())
+
+
+func _create_child_control(named: String) -> Label:
+	var new_control := Label.new()
+	new_control.name = named
+	new_control.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
+	new_control.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
+	new_control.clip_text = true
+	new_control.text = named
+	return new_control
+
+
+func _on_hidden_menu_popup_about_to_show() -> void:
+	var layout := _get_layout().clone()
+	_hidden_menu_popup.clear()
+	_hidden_menu_list = layout.get_names()
+	for i in _hidden_menu_list.size():
+		var tab_name := _hidden_menu_list[i]
+		_hidden_menu_popup.add_check_item(tab_name, i)
+		_hidden_menu_popup.set_item_checked(i, not layout.is_tab_hidden(tab_name))
+
+
+func _on_hidden_menu_popup_id_pressed(id: int) -> void:
+	var layout := _get_layout().clone()
+	var tab_name := _hidden_menu_list[id]
+	var new_hidden := not layout.is_tab_hidden(tab_name)
+	_get_layout().set_tab_hidden(tab_name, new_hidden)
+	_hidden_menu_popup.set_item_checked(id, not new_hidden)
+	emit_changed(get_edited_property(), _get_layout())  # This line may not be needed