Allow PackageList to be used as a model from QML

QML is leading here and holding the pointers for creation and destruction.

Contributes to issue CURA-8556.

plugins/Marketplace/Marketplace.py

@@ -3,6 +3,7 @@
 
 import os.path
 from PyQt5.QtCore import pyqtSlot
+from PyQt5.QtQml import qmlRegisterType
 from typing import Optional, TYPE_CHECKING
 
 from cura.ApplicationMetadata import CuraSDKVersion
@@ -12,6 +13,8 @@ from UM.Extension import Extension  # We are implementing the main object of an
 from UM.Logger import Logger
 from UM.PluginRegistry import PluginRegistry  # To find out where we are stored (the proper way).
 
+from .PackageList import PackageList  # To register this type with QML.
+
 if TYPE_CHECKING:
     from PyQt5.QtCore import QObject
 
@@ -27,6 +30,8 @@ class Marketplace(Extension):
         super().__init__()
         self._window: Optional["QObject"] = None  # If the window has been loaded yet, it'll be cached in here.
 
+        qmlRegisterType(PackageList, "Cura", 1, 7, "PackageList")
+
     @pyqtSlot()
     def show(self) -> None:
         """

plugins/Marketplace/PackageList.py

@@ -9,7 +9,7 @@ from UM.Qt.ListModel import ListModel
 from UM.TaskManagement.HttpRequestManager import HttpRequestManager  # To request the package list from the API.
 from UM.TaskManagement.HttpRequestScope import JsonDecoratorScope  # To request JSON responses from the API.
 
-from .Marketplace import PACKAGES_URL  # To get the list of packages.
+from . import Marketplace   # To get the list of packages. Imported this way to prevent circular imports.
 from .PackageModel import PackageModel  # This list is a list of PackageModels.
 
 if TYPE_CHECKING:
@@ -47,7 +47,7 @@ class PackageList(ListModel):
 
         http = HttpRequestManager.getInstance()
         http.get(
-            PACKAGES_URL,
+            Marketplace.PACKAGES_URL,
             scope = self._scope,
             callback = self._parseResponse,
             error_callback = self._onError

plugins/Marketplace/resources/qml/Plugins.qml

@@ -2,8 +2,18 @@
 // Cura is released under the terms of the LGPLv3 or higher.
 
 import QtQuick 2.15
+import QtQuick.Controls 2.15
+import Cura 1.7 as Cura
 
-Rectangle
+Item
 {
-    color: "pink" //TODO
+    Repeater
+    {
+        model: Cura.PackageList{}
+
+        Label
+        {
+            text: "Test"  //TODO: Create a card for each package.
+        }
+    }
 }