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f3cab17e20
This reverts commit 21099e30cb666d65b53fbcd749793ce6f5fe6776. It was causing a segfault when saving UFP files.
35 lines
1.5 KiB
Python
35 lines
1.5 KiB
Python
import threading
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from cura.CuraApplication import CuraApplication
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#
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# HACK:
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#
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# In project loading, when override the existing machine is selected, the stacks and containers that are correctly
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# active in the system will be overridden at runtime. Because the project loading is done in a different thread than
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# the Qt thread, something else can kick in the middle of the process. One of them is the rendering. It will access
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# the current stacks and container, which have not completely been updated yet, so Cura will crash in this case.
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#
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# This "@call_on_qt_thread" decorator makes sure that a function will always be called on the Qt thread (blocking).
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# It is applied to the read() function of project loading so it can be guaranteed that only after the project loading
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# process is completely done, everything else that needs to occupy the QT thread will be executed.
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#
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class InterCallObject:
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def __init__(self):
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self.finish_event = threading.Event()
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self.result = None
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def call_on_qt_thread(func):
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def _call_on_qt_thread_wrapper(*args, **kwargs):
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def _handle_call(ico, *args, **kwargs):
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ico.result = func(*args, **kwargs)
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ico.finish_event.set()
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inter_call_object = InterCallObject()
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new_args = tuple([inter_call_object] + list(args)[:])
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CuraApplication.getInstance().callLater(_handle_call, *new_args, **kwargs)
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inter_call_object.finish_event.wait()
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return inter_call_object.result
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return _call_on_qt_thread_wrapper
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