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Commitdd7c2e0

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committed
ENH: add a NullLayoutEngine
It can mirror what ever was there to make sure things stay compatible.
1 parentbf8a992 commitdd7c2e0

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3 files changed

+41
-5
lines changed

3 files changed

+41
-5
lines changed

‎lib/matplotlib/figure.py‎

Lines changed: 10 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -35,8 +35,9 @@
3535

3636
frommatplotlib.axesimportAxes,SubplotBase,subplot_class_factory
3737
frommatplotlib.gridspecimportGridSpec
38-
frommatplotlib.layout_engineimport (ConstrainedLayoutEngine,
39-
TightLayoutEngine,LayoutEngine)
38+
frommatplotlib.layout_engineimport (
39+
ConstrainedLayoutEngine,TightLayoutEngine,LayoutEngine,NullLayoutEnigne
40+
)
4041
importmatplotlib.legendasmlegend
4142
frommatplotlib.patchesimportRectangle
4243
frommatplotlib.textimportText
@@ -2356,7 +2357,13 @@ def set_layout_engine(self, layout=None, **kwargs):
23562357
eliflayout=='constrained':
23572358
new_layout_engine=ConstrainedLayoutEngine(**kwargs)
23582359
eliflayout=='none':
2359-
new_layout_engine=None
2360+
ifself._layout_engineisnotNone:
2361+
new_layout_engine=NullLayoutEnigne(
2362+
self._layout_engine.adjust_compatible,
2363+
self._layout_engine.colorbar_gridspec
2364+
)
2365+
else:
2366+
new_layout_engine=None
23602367
elifisinstance(layout,LayoutEngine):
23612368
new_layout_engine=layout
23622369
else:

‎lib/matplotlib/layout_engine.py‎

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -101,6 +101,28 @@ def execute(self, fig):
101101
raiseNotImplementedError
102102

103103

104+
classNullLayoutEnigne(LayoutEngine):
105+
"""
106+
A no-op LayoutEngine.
107+
108+
This is primarily to act as a place holder if we remove a layout engine.
109+
110+
Parameter
111+
---------
112+
adjust_compatible, colorbar_gridspec : bool
113+
Allow the NullLayoutEnigne to mirror the behavior of whatever
114+
layout engine it is replacing.
115+
116+
"""
117+
def__init__(self,adjust_compatible,colorbar_gridspec,**kwargs):
118+
self._adjust_compatible=adjust_compatible
119+
self._colorbar_gridspec=colorbar_gridspec
120+
super().__init__(**kwargs)
121+
122+
defexecute(self,fig):
123+
return
124+
125+
104126
classTightLayoutEngine(LayoutEngine):
105127
"""
106128
Implements the ``tight_layout`` geometry management. See

‎lib/matplotlib/tests/test_figure.py‎

Lines changed: 9 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,8 @@
1818
frommatplotlib.axesimportAxes
1919
frommatplotlib.figureimportFigure
2020
frommatplotlib.layout_engineimport (ConstrainedLayoutEngine,
21-
TightLayoutEngine)
21+
TightLayoutEngine,
22+
NullLayoutEnigne)
2223
frommatplotlib.tickerimportAutoMinorLocator,FixedFormatter,ScalarFormatter
2324
importmatplotlib.pyplotasplt
2425
importmatplotlib.datesasmdates
@@ -610,17 +611,23 @@ def test_invalid_layouts():
610611
fig,ax=plt.subplots(layout="constrained")
611612
pc=ax.pcolormesh(np.random.randn(2,2))
612613
fig.colorbar(pc)
614+
withpytest.raises(RuntimeError,match='Colorbar layout of new layout'):
615+
fig.set_layout_engine("tight")
616+
fig.set_layout_engine("none")
613617
withpytest.raises(RuntimeError,match='Colorbar layout of new layout'):
614618
fig.set_layout_engine("tight")
615619

616620
fig,ax=plt.subplots(layout="tight")
617621
pc=ax.pcolormesh(np.random.randn(2,2))
618622
fig.colorbar(pc)
623+
withpytest.raises(RuntimeError,match='Colorbar layout of new layout'):
624+
fig.set_layout_engine("constrained")
625+
fig.set_layout_engine("none")
619626
withpytest.raises(RuntimeError,match='Colorbar layout of new layout'):
620627
fig.set_layout_engine("constrained")
621628

622629
fig.set_layout_engine("none")
623-
assertfig.get_layout_engine()isNone
630+
assertisinstance(fig.get_layout_engine(),NullLayoutEnigne)
624631

625632

626633
@check_figures_equal(extensions=["png","pdf"])

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