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from contextlib import nullcontext
from .backend_cairo import FigureCanvasCairo
from .backend_gtk4 import GLib, Gtk, FigureCanvasGTK4, _BackendGTK4
class FigureCanvasGTK4Cairo(FigureCanvasCairo, FigureCanvasGTK4):
def _set_device_pixel_ratio(self, ratio):
# Cairo in GTK4 always uses logical pixels, so we don't need to do anything for
# changes to the device pixel ratio.
return False
def on_draw_event(self, widget, ctx):
if self._idle_draw_id:
GLib.source_remove(self._idle_draw_id)
self._idle_draw_id = 0
self.draw()
with (self.toolbar._wait_cursor_for_draw_cm() if self.toolbar
else nullcontext()):
self._renderer.set_context(ctx)
allocation = self.get_allocation()
Gtk.render_background(
self.get_style_context(), ctx,
allocation.x, allocation.y,
allocation.width, allocation.height)
self.figure.draw(self._renderer)
@_BackendGTK4.export
class _BackendGTK4Cairo(_BackendGTK4):
FigureCanvas = FigureCanvasGTK4Cairo
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