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Warn on unavailable fonts, fall back onto GTK default font #118

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merged 2 commits into from
Aug 1, 2023
Merged

Warn on unavailable fonts, fall back onto GTK default font #118

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afd1cc5
Issue a warning for missing fonts
SnoopJ Jul 15, 2023
3552048
Add fallback behavior onto GTK default font
SnoopJ Jul 15, 2023
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18 changes: 17 additions & 1 deletion xdot/ui/elements.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,13 +15,15 @@
#
import math
import operator
import warnings

import gi
gi.require_version('Gtk', '3.0')
gi.require_version('PangoCairo', '1.0')

from gi.repository import GObject
from gi.repository import Gdk
from gi.repository import Gtk
from gi.repository import GdkPixbuf
from gi.repository import Pango
from gi.repository import PangoCairo
Expand Down Expand Up @@ -99,6 +101,7 @@ def get_text(self):
class TextShape(Shape):

LEFT, CENTER, RIGHT = -1, 0, 1
DEFAULT_FONTNAME = Gtk.Settings.get_default().get_property("gtk-font-name")

def __init__(self, pen, x, y, j, w, t):
Shape.__init__(self)
Expand All @@ -109,6 +112,10 @@ def __init__(self, pen, x, y, j, w, t):
self.w = w # width
self.t = t # text

def _font_available(self, fontname, pango_context):
available_fonts = [family.get_name() for family in pango_context.list_families()]
return fontname in available_fonts

def _draw(self, cr, highlight, bounding):

try:
Expand Down Expand Up @@ -157,7 +164,16 @@ def _draw(self, cr, highlight, bounding):
assert success
layout.set_attributes(attrs)

font.set_family(self.pen.fontname)
if self._font_available(self.pen.fontname, pango_context=context):
font.set_family(self.pen.fontname)
else:
msg = "Font family {fontname!r} is not available, using {default!r}".format(
fontname=self.pen.fontname,
default=self.DEFAULT_FONTNAME
)
warnings.warn(msg)
font.set_family(self.DEFAULT_FONTNAME)

font.set_absolute_size(self.pen.fontsize*Pango.SCALE)
layout.set_font_description(font)

Expand Down