From b2c220a80906508dd0c63c66c036f334b8e72920 Mon Sep 17 00:00:00 2001
From: Frederic98 <13856291+Frederic98@users.noreply.github.com>
Date: Thu, 26 Sep 2024 11:31:05 +0200
Subject: [PATCH] Fix setting relationships to update UI properly.

---
 cura/BuildVolume.py                        |  1 +
 resources/definitions/fdmextruder.def.json | 11 +++++++++++
 resources/definitions/fdmprinter.def.json  | 20 ++++++++++----------
 3 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/cura/BuildVolume.py b/cura/BuildVolume.py
index 37c4c61a7ce..e9e1544afd3 100755
--- a/cura/BuildVolume.py
+++ b/cura/BuildVolume.py
@@ -810,6 +810,7 @@ def _updateUsedExtruders(self):
         for extruder in global_container_stack.extruderList:
             used = extruder in used_extruders
             extruder.definitionChanges.setProperty("extruder_used", "value", used)
+        global_container_stack.definitionChanges.setProperty("extruders_used", "value", [extruder.position for extruder in used_extruders])
 
     def _nodeActiveExtruderChanged(self):
         self._updateDisallowedAreasAndRebuild()
diff --git a/resources/definitions/fdmextruder.def.json b/resources/definitions/fdmextruder.def.json
index a0fffeeaec0..c45256fb8ad 100644
--- a/resources/definitions/fdmextruder.def.json
+++ b/resources/definitions/fdmextruder.def.json
@@ -27,6 +27,17 @@
                     "settable_per_meshgroup": false,
                     "type": "extruder"
                 },
+                "extruder_used":
+                {
+                    "default_value": true,
+                    "description": "Is this extruder used for printing. This setting is controlled by Cura automatically.",
+                    "label": "Extruder Used",
+                    "settable_globally": false,
+                    "settable_per_extruder": true,
+                    "settable_per_mesh": false,
+                    "settable_per_meshgroup": false,
+                    "type": "bool"
+                },
                 "extruder_prime_pos_z":
                 {
                     "default_value": 0,
diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 171b3fd4e8e..bc05d4b3439 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -289,16 +289,16 @@
                     "settable_per_extruder": false,
                     "settable_per_meshgroup": false
                 },
-                "extruder_used":
+                "extruders_used":
                 {
-                    "default_value": true,
-                    "description": "Is this extruder used for printing. This setting is controlled by Cura automatically.",
-                    "label": "Extruder Used",
-                    "settable_globally": false,
-                    "settable_per_extruder": true,
+                    "default_value": [],
+                    "description": "A list of extruder positions that are used. This setting is controlled by Cura automatically.",
+                    "label": "Extruders Used",
+                    "settable_globally": true,
+                    "settable_per_extruder": false,
                     "settable_per_mesh": false,
                     "settable_per_meshgroup": false,
-                    "type": "bool"
+                    "type": "[int]"
                 },
                 "machine_nozzle_tip_outer_diameter":
                 {
@@ -2494,7 +2494,7 @@
                     "enabled": "machine_heated_build_volume",
                     "settable_per_mesh": false,
                     "settable_per_extruder": false,
-                    "depends_on_settings": [ "extruder_used" ]
+                    "depends_on_settings": [ "extruders_used" ]
                 },
                 "material_print_temperature":
                 {
@@ -2599,7 +2599,7 @@
                     "type": "float",
                     "default_value": 60,
                     "value": "default_material_bed_temperature",
-                    "resolve": "max(extruderValues('material_bed_temperature'))",
+                    "resolve": "max(extruderValues('material_bed_temperature')) or extruder_used",
                     "minimum_value": "-273.15",
                     "minimum_value_warning": "build_volume_temperature",
                     "maximum_value_warning": "130",
@@ -2608,7 +2608,7 @@
                     "settable_per_mesh": false,
                     "settable_per_extruder": false,
                     "settable_per_meshgroup": false,
-                    "depends_on_settings": [ "extruder_used" ]
+                    "depends_on_settings": [ "extruders_used" ]
                 },
                 "material_bed_temperature_layer_0":
                 {