Update ParameterInput visibility when blocks are attached

https://phabricator.endlessm.com/T35519

addons/block_code/ui/blocks/utilities/parameter_input/parameter_input.gd

@@ -100,18 +100,7 @@ func _ready():
 	snap_point.block_type = block_type
 	snap_point.variant_type = variant_type
 
-	match variant_type:
-		TYPE_COLOR:
-			switch_input(_color_input)
-		TYPE_VECTOR2:
-			switch_input(_vector2_input)
-		TYPE_BOOL:
-			switch_input(_bool_input)
-		_:
-			switch_input(_text_input)
-
-	if option:
-		switch_input(_option_input)
+	_update_visible_input()
 
 
 func get_snapped_block() -> Block:
@@ -148,11 +137,29 @@ func _on_line_edit_text_changed(new_text):
 	modified.emit()
 
 
-func switch_input(node: Node):
+func _update_visible_input():
+	if snap_point.has_snapped_block():
+		_switch_input(null)
+	elif option:
+		_switch_input(_option_input)
+	else:
+		match variant_type:
+			TYPE_COLOR:
+				_switch_input(_color_input)
+			TYPE_VECTOR2:
+				_switch_input(_vector2_input)
+			TYPE_BOOL:
+				_switch_input(_bool_input)
+			_:
+				_switch_input(_text_input)
+
+
+func _switch_input(node: Node):
 	for c in _input_switcher.get_children():
 		c.visible = false
 
-	node.visible = true
+	if node:
+		node.visible = true
 
 
 func _on_color_input_color_changed(color):
@@ -169,3 +176,7 @@ func _update_panel_bg_color(new_color):
 
 func _on_option_input_item_selected(index):
 	modified.emit()
+
+
+func _on_snap_point_snapped_block_changed(block):
+	_update_visible_input()

addons/block_code/ui/blocks/utilities/parameter_input/parameter_input.tscn

@@ -156,6 +156,7 @@ size_flags_horizontal = 3
 
 [node name="BoolInput" type="MarginContainer" parent="InputSwitcher"]
 unique_name_in_owner = true
+visible = false
 layout_mode = 2
 theme_override_constants/margin_left = 8
 
@@ -187,3 +188,4 @@ variant_type = 4
 [connection signal="text_changed" from="InputSwitcher/Vector2Input/HBoxContainer/XLineEdit" to="." method="_on_line_edit_text_changed"]
 [connection signal="text_changed" from="InputSwitcher/Vector2Input/HBoxContainer/YLineEdit" to="." method="_on_line_edit_text_changed"]
 [connection signal="item_selected" from="InputSwitcher/BoolInput/BoolInputOption" to="." method="_on_option_input_item_selected"]
+[connection signal="snapped_block_changed" from="SnapPoint" to="." method="_on_snap_point_snapped_block_changed"]