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- from contextlib import nullcontext
- from .backend_cairo import FigureCanvasCairo
- from .backend_gtk4 import Gtk, FigureCanvasGTK4, _BackendGTK4
- class FigureCanvasGTK4Cairo(FigureCanvasCairo, FigureCanvasGTK4):
- _context_is_scaled = True
- def on_draw_event(self, widget, ctx):
- with (self.toolbar._wait_cursor_for_draw_cm() if self.toolbar
- else nullcontext()):
- self._renderer.set_context(ctx)
- scale = self.device_pixel_ratio
- # Scale physical drawing to logical size.
- ctx.scale(1 / scale, 1 / scale)
- allocation = self.get_allocation()
- Gtk.render_background(
- self.get_style_context(), ctx,
- allocation.x, allocation.y,
- allocation.width, allocation.height)
- self._renderer.dpi = self.figure.dpi
- self.figure.draw(self._renderer)
- @_BackendGTK4.export
- class _BackendGTK4Cairo(_BackendGTK4):
- FigureCanvas = FigureCanvasGTK4Cairo
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