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Commitf1e925f

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Add private API retrieving the current event loop and backend GUI info.
Work towards implementation of backend switching.Note that the API is kept private for now as the lack of extensibilityis a bit unsatisfying; perhaps we'll figure out a better way to do itif other custom implementers (e.g., code editors?) get interested inlooking into it.The `required_event_loop` variable could be made private for now, ornot...
1 parent65158f9 commitf1e925f

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7 files changed

+65
-1
lines changed

7 files changed

+65
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‎lib/matplotlib/backends/__init__.py

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Original file line numberDiff line numberDiff line change
@@ -1,5 +1,7 @@
11
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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57
importmatplotlib
@@ -14,6 +16,49 @@
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ifnotline.startswith(' File "<frozen importlib._bootstrap'))
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1618

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def_get_current_event_loop():
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"""Return the currently running event loop if any, or "headless", or None.
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"headless" indicates that no event loop can be started.
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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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iftkinterandany(frame.f_code.co_filename==tkinter.__file__
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andframe.f_code.co_name=="mainloop"
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forframeinsys._current_frames().values()):
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return"tk"
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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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1762
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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Original file line numberDiff line numberDiff line change
@@ -994,6 +994,7 @@ def trigger(self, *args):
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@_Backend.export
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class_BackendTk(_Backend):
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required_event_loop="tk"
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FigureManager=FigureManagerTk
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@classmethod

‎lib/matplotlib/backends/backend_gtk3.py

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Original file line numberDiff line numberDiff line change
@@ -971,6 +971,7 @@ 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_event_loop="gtk3"
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FigureCanvas=FigureCanvasGTK3
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FigureManager=FigureManagerGTK3
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‎lib/matplotlib/backends/backend_qt4.py

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -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_event_loop="qt4"

‎lib/matplotlib/backends/backend_qt5.py

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1109,6 +1109,7 @@ def exception_handler(type, value, tb):
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@_Backend.export
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class_BackendQT5(_Backend):
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required_event_loop="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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Original file line numberDiff line numberDiff line change
@@ -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_event_loop="wx"
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FigureCanvas=FigureCanvasWx
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FigureManager=FigureManagerWx
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_frame_class=FigureFrameWx

‎src/_macosx.m

Lines changed: 15 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -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)
2794+
{
2795+
if ([NSAppisRunning]) {
2796+
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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27922802
static PyObject*
27932803
show(PyObject* self)
27942804
{
@@ -3038,6 +3048,11 @@ static bool verify_framework(void)
30383048
}
30393049

30403050
staticstruct PyMethodDef methods[] = {
3051+
{"event_loop_is_running",
3052+
(PyCFunction)event_loop_is_running,
3053+
METH_NOARGS,
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"Return whether the NSApp main event loop is currently running."
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},
30413056
{"show",
30423057
(PyCFunction)show,
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METH_NOARGS,

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