142 lines
4.4 KiB
Python
142 lines
4.4 KiB
Python
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"""
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Manage figures for the pyplot interface.
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"""
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import atexit
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from collections import OrderedDict
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import gc
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class Gcf:
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"""
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Singleton to maintain the relation between figures and their managers, and
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keep track of and "active" figure and manager.
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The canvas of a figure created through pyplot is associated with a figure
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manager, which handles the interaction between the figure and the backend.
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pyplot keeps track of figure managers using an identifier, the "figure
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number" or "manager number" (which can actually be any hashable value);
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this number is available as the :attr:`number` attribute of the manager.
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This class is never instantiated; it consists of an `OrderedDict` mapping
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figure/manager numbers to managers, and a set of class methods that
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manipulate this `OrderedDict`.
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Attributes
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----------
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figs : OrderedDict
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`OrderedDict` mapping numbers to managers; the active manager is at the
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end.
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"""
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figs = OrderedDict()
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@classmethod
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def get_fig_manager(cls, num):
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"""
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If manager number *num* exists, make it the active one and return it;
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otherwise return *None*.
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"""
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manager = cls.figs.get(num, None)
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if manager is not None:
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cls.set_active(manager)
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return manager
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@classmethod
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def destroy(cls, num):
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"""
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Destroy manager *num* -- either a manager instance or a manager number.
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In the interactive backends, this is bound to the window "destroy" and
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"delete" events.
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It is recommended to pass a manager instance, to avoid confusion when
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two managers share the same number.
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"""
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if all(hasattr(num, attr) for attr in ["num", "_cidgcf", "destroy"]):
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manager = num
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if cls.figs.get(manager.num) is manager:
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cls.figs.pop(manager.num)
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else:
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return
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else:
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try:
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manager = cls.figs.pop(num)
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except KeyError:
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return
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manager.canvas.mpl_disconnect(manager._cidgcf)
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manager.destroy()
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gc.collect(1)
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@classmethod
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def destroy_fig(cls, fig):
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"""Destroy figure *fig*."""
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num = next((manager.num for manager in cls.figs.values()
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if manager.canvas.figure == fig), None)
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if num is not None:
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cls.destroy(num)
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@classmethod
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def destroy_all(cls):
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"""Destroy all figures."""
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# Reimport gc in case the module globals have already been removed
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# during interpreter shutdown.
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import gc
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for manager in list(cls.figs.values()):
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manager.canvas.mpl_disconnect(manager._cidgcf)
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manager.destroy()
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cls.figs.clear()
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gc.collect(1)
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@classmethod
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def has_fignum(cls, num):
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"""Return whether figure number *num* exists."""
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return num in cls.figs
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@classmethod
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def get_all_fig_managers(cls):
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"""Return a list of figure managers."""
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return list(cls.figs.values())
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@classmethod
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def get_num_fig_managers(cls):
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"""Return the number of figures being managed."""
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return len(cls.figs)
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@classmethod
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def get_active(cls):
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"""Return the active manager, or *None* if there is no manager."""
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return next(reversed(cls.figs.values())) if cls.figs else None
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@classmethod
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def _set_new_active_manager(cls, manager):
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"""Adopt *manager* into pyplot and make it the active manager."""
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if not hasattr(manager, "_cidgcf"):
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manager._cidgcf = manager.canvas.mpl_connect(
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"button_press_event", lambda event: cls.set_active(manager))
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fig = manager.canvas.figure
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fig.number = manager.num
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label = fig.get_label()
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if label:
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manager.set_window_title(label)
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cls.set_active(manager)
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@classmethod
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def set_active(cls, manager):
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"""Make *manager* the active manager."""
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cls.figs[manager.num] = manager
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cls.figs.move_to_end(manager.num)
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@classmethod
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def draw_all(cls, force=False):
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"""
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Redraw all stale managed figures, or, if *force* is True, all managed
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figures.
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"""
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for manager in cls.get_all_fig_managers():
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if force or manager.canvas.figure.stale:
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manager.canvas.draw_idle()
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atexit.register(Gcf.destroy_all)
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