89 lines
3.3 KiB
Python
89 lines
3.3 KiB
Python
## Copyright (C) 2026 Solaar Contributors https://pwr-solaar.github.io/Solaar/
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License along
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## with this program; if not, write to the Free Software Foundation, Inc.,
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""Theme-aware loader for Solaar's per-key UI icons.
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Loads SVG icons from ``share/solaar/icons/`` and recolors them at load
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time to match the active GTK theme's text foreground, by substituting
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``currentColor`` in the SVG before passing it to GdkPixbuf. GTK's stock
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symbolic loader is bypassed because it only recolors specific palette
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fill stand-ins and ignores ``stroke="currentColor"``.
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"""
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from __future__ import annotations
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import logging
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from pathlib import Path
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import gi
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gi.require_version("Gtk", "3.0")
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from gi.repository import GdkPixbuf # NOQA: E402
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from gi.repository import Gio # NOQA: E402
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from gi.repository import Gtk # NOQA: E402
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logger = logging.getLogger(__name__)
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ICON_PIXEL_SIZE = 22
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_search_path_added = False
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def ensure_icon_path() -> None:
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"""Register share/solaar/icons with the default GtkIconTheme so our
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custom symbolic tool icons resolve by name. Idempotent."""
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global _search_path_added
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if _search_path_added:
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return
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theme = Gtk.IconTheme.get_default()
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existing = set(theme.get_search_path() or [])
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# _icons.py: lib/solaar/ui/perkey/_icons.py -> parents[4] = repo root
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candidates = [
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Path(__file__).resolve().parents[4] / "share" / "solaar" / "icons",
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]
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for c in candidates:
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if c.is_dir() and str(c) not in existing:
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theme.append_search_path(str(c))
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_search_path_added = True
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def themed_icon_image(icon_name: str, style_widget: Gtk.Widget) -> Gtk.Image | None:
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"""Load a Solaar tool icon and recolor it to match the given widget's
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text foreground color, so the icons follow the active GTK theme
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(light / dark / custom). Returns None if the icon can't be loaded.
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"""
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ensure_icon_path()
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theme = Gtk.IconTheme.get_default()
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icon_info = theme.lookup_icon(icon_name, ICON_PIXEL_SIZE, Gtk.IconLookupFlags.FORCE_SIZE)
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if icon_info is None:
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return None
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path = icon_info.get_filename()
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if not path:
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return None
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fg = style_widget.get_style_context().get_color(Gtk.StateFlags.NORMAL)
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color = f"#{int(fg.red * 255):02x}{int(fg.green * 255):02x}{int(fg.blue * 255):02x}"
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try:
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with open(path, "r", encoding="utf-8") as f:
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svg = f.read()
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svg = svg.replace("currentColor", color)
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stream = Gio.MemoryInputStream.new_from_data(svg.encode("utf-8"))
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pixbuf = GdkPixbuf.Pixbuf.new_from_stream_at_scale(stream, ICON_PIXEL_SIZE, ICON_PIXEL_SIZE, True)
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return Gtk.Image.new_from_pixbuf(pixbuf)
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except Exception as e:
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logger.debug("recolor failed for %s: %s", icon_name, e)
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return None
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