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# Copyright (C) 2018 Philipp Hörist <philipp AT hoerist.com>
#
# This file is part of Gajim.
#
# Gajim is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Gajim is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Gajim. If not, see <http://www.gnu.org/licenses/>.
from __future__ import annotations
from typing import Optional
from typing import Union
import math
import logging
from pathlib import Path
import sys
import css_parser
from css_parser.css import CSSStyleSheet
from css_parser.css import CSSStyleRule
from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import Pango
from gajim.common import app
from gajim.common import configpaths
from gajim.common.const import StyleAttr
from gajim.common.const import CSSPriority
from gajim.common.dbus.system_style import SystemStyleListener
from .const import Theme
log = logging.getLogger('gajim.gui.css')
settings = Gtk.Settings.get_default()
class CSSConfig:
def __init__(self) -> None:
'''
CSSConfig handles loading and storing of all relevant Gajim style files
The order in which CSSConfig loads the styles
1. gajim.css
2. gajim-dark.css (Only if gtk-application-prefer-dark-theme = True)
3. default.css or default-dark.css (from gajim/data/style)
4. user-theme.css (from ~/.config/Gajim/theme)
# gajim.css:
This is the main style and the application default
# gajim-dark.css
Has only entries which we want to override in gajim.css
# default.css or default-dark.css
Has all the values that are changeable via UI (see themes.py).
Depending on `gtk-application-prefer-dark-theme` either default.css or
default-dark.css gets loaded
# user-theme.css
These are the themes the Themes Dialog stores. Because they are
loaded at last they overwrite everything else. Users should add custom
css here.'''
# Delete empty rules
css_parser.ser.prefs.keepEmptyRules = False
# Holds the currently selected theme in the Theme Editor
self._pre_css: Optional[CSSStyleSheet] = None
self._pre_css_path: Optional[Path] = None
# Holds the default theme, its used if values are not found
# in the selected theme
self._default_css: Optional[CSSStyleSheet] = None
self._default_css_path: Optional[Path] = None
# Holds the currently selected theme
self._css: Optional[CSSStyleSheet] = None
self._css_path: Optional[Path] = None
# User Theme CSS Provider
self._provider = Gtk.CssProvider()
# Used for dynamic classes like account colors
self._dynamic_provider = Gtk.CssProvider()
self._dynamic_dict: dict[str, str] = {}
self.refresh()
screen = Gdk.Screen.get_default()
assert screen is not None
Gtk.StyleContext.add_provider_for_screen(
screen,
self._dynamic_provider,
CSSPriority.APPLICATION)
# Cache of recently requested values
self._cache: dict[str, Union[str, Pango.FontDescription, None]] = {}
# Holds all currently available themes
self.themes: list[str] = []
self._system_style = SystemStyleListener(callback=self.set_dark_theme)
self.set_dark_theme()
self._load_css()
self._gather_available_themes()
self._load_default()
self._load_selected()
self._activate_theme()
Gtk.StyleContext.add_provider_for_screen(
screen,
self._provider,
CSSPriority.USER_THEME)
if sys.platform == 'win32':
self._apply_windows_font_size()
@property
def prefer_dark(self) -> bool:
setting = app.settings.get('dark_theme')
if setting == Theme.SYSTEM:
if self._system_style.prefer_dark is not None:
return self._system_style.prefer_dark
if settings is None:
return False
return settings.get_property('gtk-application-prefer-dark-theme')
return setting == Theme.DARK
def set_dark_theme(self, value: Optional[int] = None) -> None:
if value is None:
value = app.settings.get('dark_theme')
else:
app.settings.set('dark_theme', value)
if settings is None:
return
if value == Theme.SYSTEM:
if self._system_style.prefer_dark is None:
settings.reset_property('gtk-application-prefer-dark-theme')
return
value = self._system_style.prefer_dark
settings.set_property('gtk-application-prefer-dark-theme', bool(value))
self._load_css()
def _load_css(self) -> None:
self._load_css_from_file('gajim.css', CSSPriority.APPLICATION)
if self.prefer_dark:
self._load_css_from_file('gajim-dark.css',
CSSPriority.APPLICATION_DARK)
self._load_css_from_file('default.css', CSSPriority.DEFAULT_THEME)
if self.prefer_dark:
self._load_css_from_file('default-dark.css',
CSSPriority.DEFAULT_THEME_DARK)
def _load_css_from_file(self,
filename: str,
priority: CSSPriority
) -> None:
path = configpaths.get('STYLE') / filename
try:
with open(path, encoding='utf8') as file_:
css = file_.read()
except Exception as exc:
log.error('Error loading css: %s', exc)
return
self._activate_css(css, priority)
def _activate_css(self, css: str, priority: CSSPriority) -> None:
try:
provider = Gtk.CssProvider()
provider.load_from_data(bytes(css.encode('utf-8')))
screen = Gdk.Screen.get_default()
assert screen is not None
Gtk.StyleContext.add_provider_for_screen(screen,
provider,
priority)
self._load_selected()
self._activate_theme()
except Exception:
log.exception('Error loading application css')
@staticmethod
def _apply_windows_font_size() -> None:
css = '''
* {
font-size: 1.125rem;
}
'''
provider = Gtk.CssProvider()
provider.load_from_data(bytes(css.encode('utf-8')))
screen = Gdk.Screen.get_default()
assert screen is not None
Gtk.StyleContext.add_provider_for_screen(screen,
provider,
CSSPriority.PRE_APPLICATION)
@staticmethod
def _pango_to_css_weight(number: int) -> int:
# Pango allows for weight values between 100 and 1000
# CSS allows only full hundred numbers like 100, 200 ..
if number < 100:
return 100
if number > 900:
return 900
return int(math.ceil(number / 100.0)) * 100
def _gather_available_themes(self) -> None:
files = configpaths.get('MY_THEME').iterdir()
self.themes = [file.stem for file in files if file.suffix == '.css']
if 'default' in self.themes:
# Ignore user created themes that are named 'default'
self.themes.remove('default')
def get_theme_path(self, theme: str, user: bool = True) -> Path:
if theme == 'default' and self.prefer_dark:
theme = 'default-dark'
if user:
return configpaths.get('MY_THEME') / f'{theme}.css'
return configpaths.get('STYLE') / f'{theme}.css'
def _determine_theme_path(self) -> Path:
# Gets the path of the currently active theme.
# If it does not exist, it falls back to the default theme
theme = app.settings.get('roster_theme')
if theme == 'default':
return self.get_theme_path(theme, user=False)
theme_path = self.get_theme_path(theme)
if not theme or not theme_path.exists():
log.warning('Theme %s not found, fallback to default', theme)
app.settings.set('roster_theme', 'default')
log.info('Use Theme: default')
return self.get_theme_path('default', user=False)
log.info('Use Theme: %s', theme)
return theme_path
def _load_selected(self, new_path: Optional[Path] = None) -> None:
if new_path is None:
self._css_path = self._determine_theme_path()
else:
self._css_path = new_path
self._css = css_parser.parseFile(self._css_path)
def _load_default(self) -> None:
self._default_css_path = self.get_theme_path('default', user=False)
self._default_css = css_parser.parseFile(self._default_css_path)
def _load_pre(self, theme: str) -> None:
log.info('Preload theme %s', theme)
self._pre_css_path = self.get_theme_path(theme)
self._pre_css = css_parser.parseFile(self._pre_css_path)
def _write(self, pre: bool) -> None:
path = self._css_path
css = self._css
if pre:
path = self._pre_css_path
css = self._pre_css
assert path is not None
assert css is not None
with open(path, 'w', encoding='utf-8') as file:
file.write(css.cssText.decode('utf-8'))
active = self._pre_css_path == self._css_path
if not pre or active:
self._load_selected()
self._activate_theme()
def set_value(self,
selector: str,
attr: Union[str, StyleAttr],
value: Union[str, Pango.FontDescription],
pre: bool = False
) -> None:
if attr == StyleAttr.FONT:
# forward to set_font() for convenience
assert isinstance(value, Pango.FontDescription)
self.set_font(selector, value, pre)
return
if isinstance(attr, StyleAttr):
attr = attr.value
css = self._css
if pre:
css = self._pre_css
assert css is not None
for rule in css:
if rule.type != rule.STYLE_RULE:
continue
if rule.selectorText == selector:
log.info('Set %s %s %s', selector, attr, value)
rule.style[attr] = value
if not pre:
self._add_to_cache(selector, attr, value)
self._write(pre)
return
# The rule was not found, so we add it to this theme
log.info('Set %s %s %s', selector, attr, value)
rule = CSSStyleRule(selectorText=selector)
rule.style[attr] = value
css.add(rule)
self._write(pre)
def set_font(self,
selector: str,
description: Pango.FontDescription,
pre: bool = False
) -> None:
css = self._css
if pre:
css = self._pre_css
family, size, style, weight = self._get_attr_from_description(
description)
assert css is not None
for rule in css:
if rule.type != rule.STYLE_RULE:
continue
if rule.selectorText == selector:
log.info('Set Font for: %s %s %s %s %s',
selector, family, size, style, weight)
rule.style['font-family'] = family
rule.style['font-style'] = style
rule.style['font-size'] = f'{size}pt'
rule.style['font-weight'] = weight
if not pre:
self._add_to_cache(
selector, 'fontdescription', description)
self._write(pre)
return
# The rule was not found, so we add it to this theme
log.info('Set Font for: %s %s %s %s %s',
selector, family, size, style, weight)
rule = CSSStyleRule(selectorText=selector)
rule.style['font-family'] = family
rule.style['font-style'] = style
rule.style['font-size'] = f'{size}pt'
rule.style['font-weight'] = weight
css.add(rule)
self._write(pre)
def _get_attr_from_description(self,
description: Pango.FontDescription
) -> tuple[Optional[str], float, str, int]:
size = description.get_size() / Pango.SCALE
style = self._get_string_from_pango_style(description.get_style())
weight = self._pango_to_css_weight(int(description.get_weight()))
family = description.get_family()
return family, size, style, weight
def _get_default_rule(self,
selector: str,
_attr: str
) -> Optional[CSSStyleRule]:
assert self._default_css is not None
for rule in self._default_css:
if rule.type != rule.STYLE_RULE:
continue
if rule.selectorText == selector:
log.info('Get Default Rule %s', selector)
return rule
return None
def get_font(self,
selector: str,
pre: bool = False
) -> Optional[Pango.FontDescription]:
if pre:
css = self._pre_css
else:
css = self._css
try:
font_desc = self._get_from_cache(selector, 'fontdescription')
if isinstance(font_desc, Pango.FontDescription):
return font_desc
except KeyError:
pass
if css is None:
return None
for rule in css:
if rule.type != rule.STYLE_RULE:
continue
if rule.selectorText == selector:
log.info('Get Font for: %s', selector)
style = rule.style.getPropertyValue('font-style') or None
size = rule.style.getPropertyValue('font-size') or None
weight = rule.style.getPropertyValue('font-weight') or None
family = rule.style.getPropertyValue('font-family') or None
desc = self._get_description_from_css(
family, size, style, weight)
if not pre:
self._add_to_cache(selector, 'fontdescription', desc)
return desc
self._add_to_cache(selector, 'fontdescription', None)
return None
def _get_description_from_css(self,
family: Optional[str],
size: Optional[str],
style: Optional[str],
weight: Optional[str]
) -> Optional[Pango.FontDescription]:
if family is None:
return None
desc = Pango.FontDescription()
desc.set_family(family)
if weight is not None:
desc.set_weight(Pango.Weight(int(weight)))
if style is not None:
desc.set_style(self._get_pango_style_from_string(style))
if size is not None:
desc.set_size(int(size[:-2]) * Pango.SCALE)
return desc
@staticmethod
def _get_pango_style_from_string(style: str) -> Pango.Style:
if style == 'normal':
return Pango.Style(0)
if style == 'oblique':
return Pango.Style(1)
# Pango.Style.ITALIC:
return Pango.Style(2)
@staticmethod
def _get_string_from_pango_style(style: Pango.Style) -> str:
if style == Pango.Style.NORMAL:
return 'normal'
if style == Pango.Style.ITALIC:
return 'italic'
# Pango.Style.OBLIQUE:
return 'oblique'
def get_value(self,
selector: str,
attr: Union[str, StyleAttr],
pre: bool = False
) -> Union[str, Pango.FontDescription, None]:
if attr == StyleAttr.FONT:
# forward to get_font() for convenience
return self.get_font(selector, pre)
if isinstance(attr, StyleAttr):
attr = attr.value
if pre:
css = self._pre_css
else:
css = self._css
try:
return self._get_from_cache(selector, attr)
except KeyError:
pass
if css is not None:
for rule in css:
if rule.type != rule.STYLE_RULE:
continue
if rule.selectorText == selector:
log.info('Get %s %s: %s',
selector, attr, rule.style[attr] or None)
value = rule.style.getPropertyValue(attr) or None
if not pre:
self._add_to_cache(selector, attr, value)
return value
# We didn’t find the selector in the selected theme
# search in default theme
if not pre:
rule = self._get_default_rule(selector, attr)
value = rule if rule is None else rule.style[attr]
self._add_to_cache(selector, attr, value)
return value
return None
def remove_value(self,
selector: str,
attr: Union[str, StyleAttr],
pre: bool = False
) -> None:
if attr == StyleAttr.FONT:
# forward to remove_font() for convenience
self.remove_font(selector, pre)
return
if isinstance(attr, StyleAttr):
attr = attr.value
css = self._css
if pre:
css = self._pre_css
assert css is not None
for rule in css:
if rule.type != rule.STYLE_RULE:
continue
if rule.selectorText == selector:
log.info('Remove %s %s', selector, attr)
rule.style.removeProperty(attr)
break
self._write(pre)
def remove_font(self, selector: str, pre: bool = False) -> None:
css = self._css
if pre:
css = self._pre_css
assert css is not None
for rule in css:
if rule.type != rule.STYLE_RULE:
continue
if rule.selectorText == selector:
log.info('Remove Font from: %s', selector)
rule.style.removeProperty('font-family')
rule.style.removeProperty('font-size')
rule.style.removeProperty('font-style')
rule.style.removeProperty('font-weight')
break
self._write(pre)
def change_theme(self, theme: str) -> bool:
user = not theme == 'default'
theme_path = self.get_theme_path(theme, user=user)
if not theme_path.exists():
log.error('Change Theme: Theme %s does not exist', theme_path)
return False
self._load_selected(theme_path)
self._activate_theme()
app.settings.set('roster_theme', theme)
log.info('Change Theme: Successful switched to %s', theme)
return True
def change_preload_theme(self, theme: str) -> bool:
theme_path = self.get_theme_path(theme)
if not theme_path.exists():
log.error('Change Preload Theme: Theme %s does not exist',
theme_path)
return False
self._load_pre(theme)
log.info('Successful switched to %s', theme)
return True
def rename_theme(self, old_theme: str, new_theme: str) -> bool:
if old_theme not in self.themes:
log.error('Rename Theme: Old theme %s not found', old_theme)
return False
if new_theme in self.themes:
log.error('Rename Theme: New theme %s exists already', new_theme)
return False
old_theme_path = self.get_theme_path(old_theme)
new_theme_path = self.get_theme_path(new_theme)
old_theme_path.rename(new_theme_path)
self.themes.remove(old_theme)
self.themes.append(new_theme)
self._load_pre(new_theme)
log.info('Rename Theme: Successful renamed theme from %s to %s',
old_theme, new_theme)
return True
def _activate_theme(self) -> None:
log.info('Activate theme')
self._invalidate_cache()
assert self._css is not None
self._provider.load_from_data(self._css.cssText)
def add_new_theme(self, theme: str) -> bool:
theme_path = self.get_theme_path(theme)
if theme_path.exists():
log.error('Add Theme: %s exists already', theme_path)
return False
with open(theme_path, 'w', encoding='utf8'):
pass
self.themes.append(theme)
log.info('Add Theme: Successful added theme %s', theme)
return True
def remove_theme(self, theme: str) -> None:
theme_path = self.get_theme_path(theme)
if theme_path.exists():
theme_path.unlink()
self.themes.remove(theme)
log.info('Remove Theme: Successful removed theme %s', theme)
def _add_to_cache(self,
selector: str,
attr: str,
value: Union[str, Pango.FontDescription, None]
) -> None:
self._cache[selector + attr] = value
def _get_from_cache(self,
selector: str,
attr: str
) -> Union[str, Pango.FontDescription, None]:
return self._cache[selector + attr]
def _invalidate_cache(self) -> None:
self._cache = {}
def refresh(self) -> None:
css = ''
accounts = app.settings.get_accounts()
for index, account in enumerate(accounts):
color = app.settings.get_account_setting(account, 'account_color')
css_class = f'gajim_class_{index}'
css += '.%s { background-color: %s }\n' % (css_class, color)
self._dynamic_dict[account] = css_class
self._dynamic_provider.load_from_data(css.encode())
def get_dynamic_class(self, name: str) -> str:
return self._dynamic_dict[name]
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