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# Copyright (c) 2018 Ultimaker B.V.
# Cura is released under the terms of the LGPLv3 or higher.
import os.path
from UM.Qt.QtApplication import QtApplication
from cura.Stages.CuraStage import CuraStage
from typing import TYPE_CHECKING, Optional
if TYPE_CHECKING:
from UM.View.View import View
class PreviewStage(CuraStage):
"""Displays a preview of what you're about to print.
The Python component of this stage just loads PreviewMain.qml for display
when the stage is selected, and makes sure that it reverts to the previous
view when the previous stage is activated.
"""
def __init__(self, application: QtApplication, parent = None) -> None:
super().__init__(parent)
self._application = application
self._application.engineCreatedSignal.connect(self._engineCreated)
self._previously_active_view = None # type: Optional[View]
def onStageSelected(self) -> None:
"""When selecting the stage, remember which was the previous view so that
we can revert to that view when we go out of the stage later.
"""
self._previously_active_view = self._application.getController().getActiveView()
def onStageDeselected(self) -> None:
"""Called when going to a different stage (away from the Preview Stage).
When going to a different stage, the view should be reverted to what it
was before. Normally, that just reverts it to solid view.
"""
if self._previously_active_view is not None:
self._application.getController().setActiveView(self._previously_active_view.getPluginId())
self._previously_active_view = None
def _engineCreated(self) -> None:
"""Delayed load of the QML files.
We need to make sure that the QML engine is running before we can load
these.
"""
plugin_path = self._application.getPluginRegistry().getPluginPath(self.getPluginId())
if plugin_path is not None:
menu_component_path = os.path.join(plugin_path, "PreviewMenu.qml")
main_component_path = os.path.join(plugin_path, "PreviewMain.qml")
self.addDisplayComponent("menu", menu_component_path)
self.addDisplayComponent("main", main_component_path)
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