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Commitd762d6d

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Merge pull request#11520 from anntzer/getcurrenteventloop
Add private API retrieving the current event loop and backend GUI info.
2 parentsd9d7ff1 +93ebee6 commitd762d6d

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9 files changed

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9 files changed

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‎doc/api/next_api_changes/2018-06-27-AL.rst

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@@ -4,3 +4,10 @@ Changes to backend loading
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Failure to load backend modules (``macosx`` on non-framework builds and
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``gtk3`` when running headless) now raises `ImportError` (instead of
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`RuntimeError` and `TypeError`, respectively.
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Third-party backends that integrate with an interactive framework are now
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encouraged to define the ``required_interactive_framework`` global value to one
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of the following values: "qt5", "qt4", "gtk3", "wx", "tk", or "macosx". This
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information will be used to determine whether it is possible to switch from a
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backend to another (specifically, whether they use the same interactive
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framework).

‎lib/matplotlib/backends/__init__.py

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@@ -1,5 +1,7 @@
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importimportlib
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importlogging
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importos
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importsys
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importtraceback
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importmatplotlib
@@ -14,6 +16,54 @@
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ifnotline.startswith(' File "<frozen importlib._bootstrap'))
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def_get_running_interactive_framework():
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"""
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Return the interactive framework whose event loop is currently running, if
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any, or "headless" if no event loop can be started, or None.
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Returns
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-------
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Optional[str]
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One of the following values: "qt5", "qt4", "gtk3", "wx", "tk",
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"macosx", "headless", ``None``.
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"""
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QtWidgets= (sys.modules.get("PyQt5.QtWidgets")
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orsys.modules.get("PySide2.QtWidgets"))
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ifQtWidgetsandQtWidgets.QApplication.instance():
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return"qt5"
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QtGui= (sys.modules.get("PyQt4.QtGui")
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orsys.modules.get("PySide.QtGui"))
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ifQtGuiandQtGui.QApplication.instance():
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return"qt4"
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Gtk= (sys.modules.get("gi.repository.Gtk")
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orsys.modules.get("pgi.repository.Gtk"))
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ifGtkandGtk.main_level():
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return"gtk3"
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wx=sys.modules.get("wx")
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ifwxandwx.GetApp():
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return"wx"
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tkinter=sys.modules.get("tkinter")
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iftkinter:
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forframeinsys._current_frames().values():
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whileframe:
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ifframe.f_code==tkinter.mainloop.__code__:
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return"tk"
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frame=frame.f_back
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try:
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frommatplotlib.backendsimport_macosx
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exceptImportError:
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pass
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else:
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# Note that the NSApp event loop is also running when a non-native
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# toolkit (e.g. Qt5) is active, but in that case we want to report the
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# other toolkit; thus, this check comes after the other toolkits.
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if_macosx.event_loop_is_running():
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return"macosx"
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ifsys.platform.startswith("linux")andnotos.environ.get("DISPLAY"):
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return"headless"
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returnNone
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defpylab_setup(name=None):
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"""
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Return new_figure_manager, draw_if_interactive and show for pyplot.

‎lib/matplotlib/backends/_backend_tk.py

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@@ -995,6 +995,7 @@ def trigger(self, *args):
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@_Backend.export
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class_BackendTk(_Backend):
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required_interactive_framework="tk"
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FigureManager=FigureManagerTk
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@classmethod

‎lib/matplotlib/backends/backend_gtk3.py

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@@ -976,6 +976,7 @@ def error_msg_gtk(msg, parent=None):
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@_Backend.export
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class_BackendGTK3(_Backend):
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required_interactive_framework="gtk3"
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FigureCanvas=FigureCanvasGTK3
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FigureManager=FigureManagerGTK3
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‎lib/matplotlib/backends/backend_macosx.py

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@@ -185,6 +185,7 @@ def set_message(self, message):
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@_Backend.export
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class_BackendMac(_Backend):
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required_interactive_framework="macosx"
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FigureCanvas=FigureCanvasMac
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FigureManager=FigureManagerMac
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‎lib/matplotlib/backends/backend_qt4.py

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@@ -7,4 +7,4 @@
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@_BackendQT5.export
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class_BackendQT4(_BackendQT5):
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pass
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required_interactive_framework="qt4"

‎lib/matplotlib/backends/backend_qt5.py

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@@ -1108,6 +1108,7 @@ def exception_handler(type, value, tb):
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@_Backend.export
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class_BackendQT5(_Backend):
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required_interactive_framework="qt5"
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FigureCanvas=FigureCanvasQT
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FigureManager=FigureManagerQT
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‎lib/matplotlib/backends/backend_wx.py

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@@ -1930,6 +1930,7 @@ def OnPrintPage(self, page):
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@_Backend.export
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class_BackendWx(_Backend):
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required_interactive_framework="wx"
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FigureCanvas=FigureCanvasWx
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FigureManager=FigureManagerWx
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_frame_class=FigureFrameWx

‎src/_macosx.m

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@@ -2789,6 +2789,16 @@ - (int)index
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}
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@end
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static PyObject*
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event_loop_is_running(PyObject* self)
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{
2795+
if ([NSAppisRunning]) {
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Py_RETURN_TRUE;
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}else {
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Py_RETURN_FALSE;
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}
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}
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static PyObject*
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show(PyObject* self)
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{
@@ -3038,6 +3048,11 @@ static bool verify_framework(void)
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}
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staticstruct PyMethodDef methods[] = {
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{"event_loop_is_running",
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(PyCFunction)event_loop_is_running,
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METH_NOARGS,
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"Return whether the NSApp main event loop is currently running."
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},
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{"show",
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(PyCFunction)show,
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METH_NOARGS,

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