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332 lines
11 KiB
Python
332 lines
11 KiB
Python
"""
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Common code for GTK3 and GTK4 backends.
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"""
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import logging
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import sys
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import matplotlib as mpl
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from matplotlib import _api, backend_tools, cbook
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from matplotlib._pylab_helpers import Gcf
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from matplotlib.backend_bases import (
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_Backend, FigureCanvasBase, FigureManagerBase, NavigationToolbar2,
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TimerBase)
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from matplotlib.backend_tools import Cursors
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import gi
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# The GTK3/GTK4 backends will have already called `gi.require_version` to set
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# the desired GTK.
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from gi.repository import Gdk, Gio, GLib, Gtk
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try:
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gi.require_foreign("cairo")
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except ImportError as e:
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raise ImportError("Gtk-based backends require cairo") from e
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_log = logging.getLogger(__name__)
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_application = None # Placeholder
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def _shutdown_application(app):
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# The application might prematurely shut down if Ctrl-C'd out of IPython,
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# so close all windows.
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for win in app.get_windows():
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win.close()
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# The PyGObject wrapper incorrectly thinks that None is not allowed, or we
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# would call this:
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# Gio.Application.set_default(None)
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# Instead, we set this property and ignore default applications with it:
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app._created_by_matplotlib = True
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global _application
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_application = None
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def _create_application():
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global _application
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if _application is None:
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app = Gio.Application.get_default()
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if app is None or getattr(app, '_created_by_matplotlib', False):
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# display_is_valid returns False only if on Linux and neither X11
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# nor Wayland display can be opened.
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if not mpl._c_internal_utils.display_is_valid():
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raise RuntimeError('Invalid DISPLAY variable')
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_application = Gtk.Application.new('org.matplotlib.Matplotlib3',
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Gio.ApplicationFlags.NON_UNIQUE)
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# The activate signal must be connected, but we don't care for
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# handling it, since we don't do any remote processing.
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_application.connect('activate', lambda *args, **kwargs: None)
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_application.connect('shutdown', _shutdown_application)
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_application.register()
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cbook._setup_new_guiapp()
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else:
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_application = app
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return _application
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def mpl_to_gtk_cursor_name(mpl_cursor):
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return _api.check_getitem({
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Cursors.MOVE: "move",
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Cursors.HAND: "pointer",
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Cursors.POINTER: "default",
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Cursors.SELECT_REGION: "crosshair",
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Cursors.WAIT: "wait",
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Cursors.RESIZE_HORIZONTAL: "ew-resize",
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Cursors.RESIZE_VERTICAL: "ns-resize",
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}, cursor=mpl_cursor)
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class TimerGTK(TimerBase):
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"""Subclass of `.TimerBase` using GTK timer events."""
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def __init__(self, *args, **kwargs):
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self._timer = None
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super().__init__(*args, **kwargs)
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def _timer_start(self):
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# Need to stop it, otherwise we potentially leak a timer id that will
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# never be stopped.
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self._timer_stop()
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self._timer = GLib.timeout_add(self._interval, self._on_timer)
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def _timer_stop(self):
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if self._timer is not None:
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GLib.source_remove(self._timer)
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self._timer = None
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def _timer_set_interval(self):
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# Only stop and restart it if the timer has already been started.
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if self._timer is not None:
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self._timer_stop()
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self._timer_start()
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def _on_timer(self):
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super()._on_timer()
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# Gtk timeout_add() requires that the callback returns True if it
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# is to be called again.
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if self.callbacks and not self._single:
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return True
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else:
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self._timer = None
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return False
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class _FigureCanvasGTK(FigureCanvasBase):
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_timer_cls = TimerGTK
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class _FigureManagerGTK(FigureManagerBase):
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"""
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Attributes
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----------
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canvas : `FigureCanvas`
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The FigureCanvas instance
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num : int or str
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The Figure number
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toolbar : Gtk.Toolbar or Gtk.Box
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The toolbar
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vbox : Gtk.VBox
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The Gtk.VBox containing the canvas and toolbar
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window : Gtk.Window
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The Gtk.Window
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"""
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def __init__(self, canvas, num):
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self._gtk_ver = gtk_ver = Gtk.get_major_version()
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app = _create_application()
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self.window = Gtk.Window()
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app.add_window(self.window)
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super().__init__(canvas, num)
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if gtk_ver == 3:
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icon_ext = "png" if sys.platform == "win32" else "svg"
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self.window.set_icon_from_file(
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str(cbook._get_data_path(f"images/matplotlib.{icon_ext}")))
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self.vbox = Gtk.Box()
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self.vbox.set_property("orientation", Gtk.Orientation.VERTICAL)
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if gtk_ver == 3:
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self.window.add(self.vbox)
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self.vbox.show()
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self.canvas.show()
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self.vbox.pack_start(self.canvas, True, True, 0)
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elif gtk_ver == 4:
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self.window.set_child(self.vbox)
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self.vbox.prepend(self.canvas)
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# calculate size for window
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w, h = self.canvas.get_width_height()
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if self.toolbar is not None:
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if gtk_ver == 3:
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self.toolbar.show()
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self.vbox.pack_end(self.toolbar, False, False, 0)
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elif gtk_ver == 4:
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sw = Gtk.ScrolledWindow(vscrollbar_policy=Gtk.PolicyType.NEVER)
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sw.set_child(self.toolbar)
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self.vbox.append(sw)
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min_size, nat_size = self.toolbar.get_preferred_size()
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h += nat_size.height
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self.window.set_default_size(w, h)
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self._destroying = False
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self.window.connect("destroy", lambda *args: Gcf.destroy(self))
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self.window.connect({3: "delete_event", 4: "close-request"}[gtk_ver],
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lambda *args: Gcf.destroy(self))
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if mpl.is_interactive():
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self.window.show()
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self.canvas.draw_idle()
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self.canvas.grab_focus()
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def destroy(self, *args):
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if self._destroying:
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# Otherwise, this can be called twice when the user presses 'q',
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# which calls Gcf.destroy(self), then this destroy(), then triggers
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# Gcf.destroy(self) once again via
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# `connect("destroy", lambda *args: Gcf.destroy(self))`.
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return
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self._destroying = True
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self.window.destroy()
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self.canvas.destroy()
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@classmethod
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def start_main_loop(cls):
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global _application
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if _application is None:
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return
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try:
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_application.run() # Quits when all added windows close.
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except KeyboardInterrupt:
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# Ensure all windows can process their close event from
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# _shutdown_application.
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context = GLib.MainContext.default()
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while context.pending():
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context.iteration(True)
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raise
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finally:
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# Running after quit is undefined, so create a new one next time.
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_application = None
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def show(self):
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# show the figure window
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self.window.show()
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self.canvas.draw()
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if mpl.rcParams["figure.raise_window"]:
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meth_name = {3: "get_window", 4: "get_surface"}[self._gtk_ver]
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if getattr(self.window, meth_name)():
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self.window.present()
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else:
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# If this is called by a callback early during init,
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# self.window (a GtkWindow) may not have an associated
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# low-level GdkWindow (on GTK3) or GdkSurface (on GTK4) yet,
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# and present() would crash.
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_api.warn_external("Cannot raise window yet to be setup")
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def full_screen_toggle(self):
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is_fullscreen = {
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3: lambda w: (w.get_window().get_state()
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& Gdk.WindowState.FULLSCREEN),
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4: lambda w: w.is_fullscreen(),
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}[self._gtk_ver]
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if is_fullscreen(self.window):
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self.window.unfullscreen()
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else:
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self.window.fullscreen()
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def get_window_title(self):
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return self.window.get_title()
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def set_window_title(self, title):
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self.window.set_title(title)
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def resize(self, width, height):
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width = int(width / self.canvas.device_pixel_ratio)
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height = int(height / self.canvas.device_pixel_ratio)
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if self.toolbar:
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min_size, nat_size = self.toolbar.get_preferred_size()
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height += nat_size.height
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canvas_size = self.canvas.get_allocation()
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if self._gtk_ver >= 4 or canvas_size.width == canvas_size.height == 1:
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# A canvas size of (1, 1) cannot exist in most cases, because
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# window decorations would prevent such a small window. This call
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# must be before the window has been mapped and widgets have been
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# sized, so just change the window's starting size.
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self.window.set_default_size(width, height)
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else:
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self.window.resize(width, height)
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class _NavigationToolbar2GTK(NavigationToolbar2):
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# Must be implemented in GTK3/GTK4 backends:
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# * __init__
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# * save_figure
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def set_message(self, s):
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escaped = GLib.markup_escape_text(s)
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self.message.set_markup(f'<small>{escaped}</small>')
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def draw_rubberband(self, event, x0, y0, x1, y1):
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height = self.canvas.figure.bbox.height
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y1 = height - y1
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y0 = height - y0
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rect = [int(val) for val in (x0, y0, x1 - x0, y1 - y0)]
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self.canvas._draw_rubberband(rect)
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def remove_rubberband(self):
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self.canvas._draw_rubberband(None)
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def _update_buttons_checked(self):
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for name, active in [("Pan", "PAN"), ("Zoom", "ZOOM")]:
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button = self._gtk_ids.get(name)
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if button:
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with button.handler_block(button._signal_handler):
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button.set_active(self.mode.name == active)
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def pan(self, *args):
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super().pan(*args)
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self._update_buttons_checked()
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def zoom(self, *args):
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super().zoom(*args)
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self._update_buttons_checked()
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def set_history_buttons(self):
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can_backward = self._nav_stack._pos > 0
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can_forward = self._nav_stack._pos < len(self._nav_stack) - 1
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if 'Back' in self._gtk_ids:
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self._gtk_ids['Back'].set_sensitive(can_backward)
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if 'Forward' in self._gtk_ids:
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self._gtk_ids['Forward'].set_sensitive(can_forward)
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class RubberbandGTK(backend_tools.RubberbandBase):
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def draw_rubberband(self, x0, y0, x1, y1):
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_NavigationToolbar2GTK.draw_rubberband(
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self._make_classic_style_pseudo_toolbar(), None, x0, y0, x1, y1)
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def remove_rubberband(self):
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_NavigationToolbar2GTK.remove_rubberband(
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self._make_classic_style_pseudo_toolbar())
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class ConfigureSubplotsGTK(backend_tools.ConfigureSubplotsBase):
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def trigger(self, *args):
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_NavigationToolbar2GTK.configure_subplots(self, None)
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class _BackendGTK(_Backend):
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backend_version = "{}.{}.{}".format(
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Gtk.get_major_version(),
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Gtk.get_minor_version(),
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Gtk.get_micro_version(),
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)
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mainloop = _FigureManagerGTK.start_main_loop
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