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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
## 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.
class PreviewStage(CuraStage):
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]
## 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.
def onStageSelected(self) -> None:
self._previously_active_view = self._application.getController().getActiveView()
## 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.
def onStageDeselected(self) -> None:
if self._previously_active_view is not None:
self._application.getController().setActiveView(self._previously_active_view.getPluginId())
self._previously_active_view = None
## Delayed load of the QML files.
#
# We need to make sure that the QML engine is running before we can load
# these.
def _engineCreated(self) -> None:
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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