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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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