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Add convenience functions for running Python code on the EDT #12
Description
Let's add scyjava.awt.invoke(python_function) as a shortcut for EventQueue.invokeAndWait(java_runnable_object), and scyjava.awt.queue(python_function) as a shortcut for EventQueue.invokeLater(java_runnable_object). Internally it would work like this:
from jnius import PythonJavaClass, java_method
class JavaRunnable(PythonJavaClass):
__javainterfaces__ = ['java/lang/Runnable']
def __init__(self, f):
super(JavaRunnable, self).__init__()
self._f = f
@java_method('()V')
def run(self):
_f()
EventQueue = autoclass('java.awt.EventQueue')
EventQueue.invokeLater(JavaRunnable(lambda: ij.ui().showDialog('hello')))Where ij.ui().showDialog('hello') is something that—at least on macOS—hangs the Python process when run from the wrong native thread.
As part of this work, we may want to enhance the to_java method to accept Python functions and have it wrap them as Runnables.
Activity
ctrueden commentedon Dec 16, 2019
CC @hanslovsky
hanslovsky commentedon Dec 17, 2019
Thanks @ctrueden
should be
We could even provide convenience classes like this for all classes in the
java.util.functionpackage that would live at the top level ofscijava, or maybe we could just put it atscijava.function. Unfortunately, we cannot auto map python functions/lambdas because we can only check the number of arguments but not the types, e.g.FunctionvsLongFunctionand we do not know if anything is being returned (ConsumervsFunction).That would be quite a bit of work but is something that is probably very suitable for a student.