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- from contextlib import nullcontext
- from .backend_cairo import FigureCanvasCairo
- from .backend_gtk3 import GLib, Gtk, FigureCanvasGTK3, _BackendGTK3
- class FigureCanvasGTK3Cairo(FigureCanvasCairo, FigureCanvasGTK3):
- 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()):
- allocation = self.get_allocation()
- # Render the background before scaling, as the allocated size here is in
- # logical pixels.
- Gtk.render_background(
- self.get_style_context(), ctx,
- 0, 0, allocation.width, allocation.height)
- scale = self.device_pixel_ratio
- # Scale physical drawing to logical size.
- ctx.scale(1 / scale, 1 / scale)
- self._renderer.set_context(ctx)
- # Set renderer to physical size so it renders in full resolution.
- self._renderer.width = allocation.width * scale
- self._renderer.height = allocation.height * scale
- self._renderer.dpi = self.figure.dpi
- self.figure.draw(self._renderer)
- @_BackendGTK3.export
- class _BackendGTK3Cairo(_BackendGTK3):
- FigureCanvas = FigureCanvasGTK3Cairo
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