Added PauseBackendPlugin, added to changelog. CURA-3361

plugins/PauseBackendPlugin/PauseBackend.py

@@ -0,0 +1,53 @@
+# Copyright ;(c) 2016 Ultimaker B.V.
+# Cura is released under the terms of the AGPLv3 or higher.
+
+from PyQt5.QtCore import QTimer
+
+from UM.Extension import Extension
+from UM.Application import Application
+from UM.PluginRegistry import PluginRegistry
+from UM.Logger import Logger
+
+from UM.Backend.Backend import BackendState
+
+from PyQt5.QtQml import QQmlComponent, QQmlContext
+from PyQt5.QtCore import QUrl, pyqtSlot, QObject
+
+import os.path
+
+class PauseBackend(QObject, Extension):
+    def __init__(self, parent = None):
+        super().__init__(parent = parent)
+
+        self._additional_component = None
+        self._additional_components_view = None
+
+        Application.getInstance().engineCreatedSignal.connect(self._createAdditionalComponentsView)
+
+    def _createAdditionalComponentsView(self):
+        Logger.log("d", "Creating additional ui components for Pause Backend plugin.")
+
+        path = QUrl.fromLocalFile(os.path.join(PluginRegistry.getInstance().getPluginPath("PauseBackendPlugin"), "PauseBackend.qml"))
+        self._additional_component = QQmlComponent(Application.getInstance()._engine, path)
+
+        # We need access to engine (although technically we can't)
+        self._additional_components_context = QQmlContext(Application.getInstance()._engine.rootContext())
+        self._additional_components_context.setContextProperty("manager", self)
+
+        self._additional_components_view = self._additional_component.create(self._additional_components_context)
+        if not self._additional_components_view:
+            Logger.log("w", "Could not create additional components for Pause Backend plugin.")
+            return
+
+        Application.getInstance().addAdditionalComponent("saveButton", self._additional_components_view.findChild(QObject, "pauseResumeButton"))
+
+    @pyqtSlot()
+    def pauseBackend(self):
+        backend = Application.getInstance().getBackend()
+        backend.pauseSlicing()
+
+    @pyqtSlot()
+    def resumeBackend(self):
+        backend = Application.getInstance().getBackend()
+        backend.continueSlicing()
+        backend.forceSlice()