Add useragreement screen on first run of Cura

CURA-4501

plugins/UserAgreementPlugin/UserAgreement.py

@@ -0,0 +1,50 @@
+# Copyright (c) 2015 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from UM.Extension import Extension
+from UM.Preferences import Preferences
+from UM.Application import Application
+from UM.PluginRegistry import PluginRegistry
+from UM.Logger import Logger
+
+from PyQt5.QtQml import QQmlComponent, QQmlContext
+from PyQt5.QtCore import QUrl, QObject, pyqtSlot
+
+import os.path
+
+class UserAgreement(Extension, QObject):
+    def __init__(self, parent = None):
+        QObject.__init__(self, parent)
+        Extension.__init__(self)
+        self._user_agreement_window = None
+        self._user_agreement_context = None
+        Application.getInstance().engineCreatedSignal.connect(self._onEngineCreated)
+        Preferences.getInstance().addPreference("general/accepted_user_agreement", False)
+
+    def _onEngineCreated(self):
+        if not Preferences.getInstance().getValue("general/accepted_user_agreement"):
+            self.showUserAgreement()
+
+    def showUserAgreement(self):
+        if not self._user_agreement_window:
+            self.createUserAgreementWindow()
+
+        self._user_agreement_window.show()
+
+    @pyqtSlot()
+    def disagreed(self):
+        Logger.log("i", "User did NOT Accept the license")
+
+    @pyqtSlot()
+    def agreed(self):
+        Logger.log("i", "User Accepted the license")
+        Preferences.getInstance().setValue("general/accepted_user_agreement", True)
+        self._user_agreement_window.hide()
+
+    def createUserAgreementWindow(self):
+        path = QUrl.fromLocalFile(os.path.join(PluginRegistry.getInstance().getPluginPath(self.getPluginId()), "UserAgreement.qml"))
+
+        component = QQmlComponent(Application.getInstance()._engine, path)
+        self._user_agreement_context = QQmlContext(Application.getInstance()._engine.rootContext())
+        self._user_agreement_context.setContextProperty("manager", self)
+        self._user_agreement_window = component.create(self._user_agreement_context)