upstream/ipython Files · IPython/terminal/pt_inputhooks/gtk4.py

Refuse to install event loop hooks when not using `prompt_toolkit` (#14132)...

Refuse to install event loop hooks when not using `prompt_toolkit` (#14132) Without this, `%gui` is effectively a no-op but the user thinks it works. For example. If running `ipython`: ``` In [1]: import matplotlib; matplotlib.use('QtAgg'); from matplotlib import pyplot; pyplot.ion(); pyplot.plot([1, 2, 3, 4]) Installed qt6 event loop hook. Out[1]: [<matplotlib.lines.Line2D at 0x1ba2f59d2a0>] ``` The window appears and responds as expected. If running `ipython --simple-prompt`, the user would see the same output, when in fact no event loop hook was installed since it's not supported without `prompt_toolkit`. The resulting Qt window is unresponsive because the event loop is not running, i.e. with `--simple-prompt`, Qt windows should block (but `pyplot` doesn't/can't know to do that) With this PR, the user will see: ``` In [1]: import matplotlib; matplotlib.use('QtAgg'); from matplotlib import pyplot; pyplot.ion(); pyplot.plot([1, 2, 3, 4]) Cannot install event loop hook for "qt" when running with `--simple-prompt`. NOTE: Tk is supported natively; use Tk apps and Tk backends with `--simple-prompt`. Out[1]: [<matplotlib.lines.Line2D at 0x170be0c0310>] ``` They'll still get an unresponsive Qt window, but they'll at least be told this can't work (while anything using Tk will work just fine).

Matthias Bussonnier - - Load All Authors

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      """

      prompt_toolkit input hook for GTK 4.

      """

      from gi.repository import GLib

      class _InputHook:

          def __init__(self, context):

              self._quit = False

              GLib.io_add_watch(

                  context.fileno(), GLib.PRIORITY_DEFAULT, GLib.IO_IN, self.quit

              )

          def quit(self, *args, **kwargs):

              self._quit = True

              return False

          def run(self):

              context = GLib.MainContext.default()

              while not self._quit:

                  context.iteration(True)

      def inputhook(context):

          hook = _InputHook(context)

          hook.run()

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				"""
				prompt_toolkit input hook for GTK 4.
				"""

				from gi.repository import GLib


				class _InputHook:
				def __init__(self, context):
				self._quit = False
				GLib.io_add_watch(
				context.fileno(), GLib.PRIORITY_DEFAULT, GLib.IO_IN, self.quit
				)

				def quit(self, args, *kwargs):
				self._quit = True
				return False

				def run(self):
				context = GLib.MainContext.default()
				while not self._quit:
				context.iteration(True)


				def inputhook(context):
				hook = _InputHook(context)
				hook.run()