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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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