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Support fractional HiDPI in GTK4 backend #30344

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Merged
merged 2 commits into from
Jul 24, 2025
+19 −6
Merged

Support fractional HiDPI in GTK4 backend #30344

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f4d9f6c
Support fractional HiDPI in GTK4 backend
QuLogic Jul 23, 2025
b0ad3c1
DOC: Fix deprecations in GTK4 embedding examples
QuLogic Jul 24, 2025
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5 changes: 2 additions & 3 deletions galleries/examples/user_interfaces/embedding_in_gtk4_panzoom_sgskip.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,10 +44,9 @@ def on_activate(app):
toolbar = NavigationToolbar(canvas)
vbox.append(toolbar)

win.show()
win.present()


app = Gtk.Application(
application_id='org.matplotlib.examples.EmbeddingInGTK4PanZoom')
app = Gtk.Application(application_id='org.matplotlib.examples.EmbeddingInGTK4PanZoom')
app.connect('activate', on_activate)
app.run(None)
2 changes: 1 addition & 1 deletion galleries/examples/user_interfaces/embedding_in_gtk4_sgskip.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,7 @@ def on_activate(app):
canvas.set_size_request(800, 600)
sw.set_child(canvas)

win.show()
win.present()


app = Gtk.Application(application_id='org.matplotlib.examples.EmbeddingInGTK4')
Expand Down
18 changes: 16 additions & 2 deletions lib/matplotlib/backends/backend_gtk4.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@
)

_GOBJECT_GE_3_47 = gi.version_info >= (3, 47, 0)
_GTK_GE_4_12 = Gtk.check_version(4, 12, 0) is None


class FigureCanvasGTK4(_FigureCanvasGTK, Gtk.DrawingArea):
Expand All @@ -48,7 +49,10 @@ def __init__(self, figure=None):

self.set_draw_func(self._draw_func)
self.connect('resize', self.resize_event)
self.connect('notify::scale-factor', self._update_device_pixel_ratio)
if _GTK_GE_4_12:
self.connect('realize', self._realize_event)
else:
self.connect('notify::scale-factor', self._update_device_pixel_ratio)

click = Gtk.GestureClick()
click.set_button(0) # All buttons.
Expand Down Expand Up @@ -237,10 +241,20 @@ def _get_key(self, keyval, keycode, state):
and not (mod == "shift" and unikey.isprintable()))]
return "+".join([*mods, key])

def _realize_event(self, obj):
surface = self.get_native().get_surface()
surface.connect('notify::scale', self._update_device_pixel_ratio)
self._update_device_pixel_ratio()

def _update_device_pixel_ratio(self, *args, **kwargs):
# We need to be careful in cases with mixed resolution displays if
# device_pixel_ratio changes.
if self._set_device_pixel_ratio(self.get_scale_factor()):
if _GTK_GE_4_12:
scale = self.get_native().get_surface().get_scale()
else:
scale = self.get_scale_factor()
assert scale is not None
if self._set_device_pixel_ratio(scale):
self.draw()

def _draw_rubberband(self, rect):
Expand Down
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