W.I.P.: Press print on abstract cloud printer. User should see dialog.

Start of implementation. When printing on an abstract printer, a user should see a dialog with the matching concrete cloud printers to pick from to actually print. Names are not final. Very much a work in progress. Very not finished also.

start of implementation for CURA-9278

cura/Machines/Models/CompatibleMachineModel.py

@@ -0,0 +1,73 @@
+# Copyright (c) 2022 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+# TODO?: documentation
+
+from typing import Optional
+
+from PyQt6.QtCore import Qt, QTimer, QObject, pyqtSlot, pyqtProperty, pyqtSignal
+
+from UM.Qt.ListModel import ListModel
+from UM.Settings.ContainerStack import ContainerStack
+from UM.i18n import i18nCatalog
+from UM.Util import parseBool
+
+from cura.PrinterOutput.PrinterOutputDevice import ConnectionType
+from cura.Settings.CuraContainerRegistry import CuraContainerRegistry
+
+
+class CompatibleMachineModel(ListModel):
+    NameRole = Qt.ItemDataRole.UserRole + 1
+    IdRole = Qt.ItemDataRole.UserRole + 2
+    ExtrudersRole = Qt.ItemDataRole.UserRole + 3
+
+    def __init__(self, parent: Optional[QObject] = None) -> None:
+        super().__init__(parent)
+
+        self._filter_on_definition_id: Optional[str] = None
+
+        self._catalog = i18nCatalog("cura")
+
+        self.addRoleName(self.NameRole, "name")
+        self.addRoleName(self.IdRole, "id")
+        self.addRoleName(self.ExtrudersRole, "extruders")
+
+    filterChanged = pyqtSignal(str)
+
+    @pyqtSlot(str)
+    def setFilter(self, abstract_machine_id: str) -> None:
+        # TODO??: defensive coding; check if machine is abstract & abort/log if not
+        self._filter_on_definition_id = abstract_machine_id
+
+        # Don't need a delayed update, since it's fire once on user click (either on 'print to cloud' or 'refresh').
+        # So, no signals that could come in (too) quickly.
+        self.filterChanged.emit(self._filter_on_definition_id)
+        self._update()
+
+    @pyqtProperty(str, fset=setFilter, notify=filterChanged)
+    def filter(self) -> str:
+        return self._filter_on_definition_id
+
+    def _update(self) -> None:
+        self.clear()
+        if not self._filter_on_definition_id or self._filter_on_definition_id == "":
+            # TODO?: log
+            return
+
+        from cura.CuraApplication import CuraApplication
+        machine_manager = CuraApplication.getInstance().getMachineManager()
+        compatible_machines = machine_manager.getMachinesWithDefinition(self._filter_on_definition_id, online_only = True)
+        # TODO: Handle 0 compatible machines -> option to close window? Message in card? (remember  the design has a refresh button!)
+
+        for container_stack in compatible_machines:
+            if parseBool(container_stack.getMetaDataEntry("hidden", False)) or parseBool(container_stack.getMetaDataEntry("is_abstract_machine", False)):
+                continue
+            self.addItem(container_stack)
+
+    def addItem(self, container_stack: ContainerStack, machine_count: int = 0) -> None:
+        extruders = CuraContainerRegistry.getInstance().findContainerStacks(type="extruder_train", machine=container_stack.getId())
+        self.appendItem({
+                         "name": container_stack.getName(),
+                         "id": container_stack.getId(),
+                         "extruders": [extruder.getMetaData().copy() for extruder in extruders]
+                        })