# Copyright (C) 2006-2007 Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
import logging
import re
import gobject
import gtk
import hippo
import rsvg
import cairo
import time
from sugar.graphics import color
from sugar.graphics.xocolor import XoColor
from sugar.graphics import font
from sugar.graphics import units
from sugar.graphics.palette import Palette, CanvasInvoker
class _IconCacheIcon:
def __init__(self, name, fill_color, stroke_color, now):
self.data_size = None
self.handle = self._read_icon_data(name, fill_color, stroke_color)
self.last_used = now
self.usage_count = 1
def _read_icon_data(self, filename, fill_color, stroke_color):
icon_file = open(filename, 'r')
data = icon_file.read()
icon_file.close()
if fill_color:
entity = '<!ENTITY fill_color "%s">' % fill_color
data = re.sub('<!ENTITY fill_color .*>', entity, data)
if stroke_color:
entity = '<!ENTITY stroke_color "%s">' % stroke_color
data = re.sub('<!ENTITY stroke_color .*>', entity, data)
self.data_size = len(data)
return rsvg.Handle(data=data)
class _IconCache:
_CACHE_MAX = 50000 # in bytes
def __init__(self):
self._icons = {}
self._theme = gtk.icon_theme_get_default()
self._cache_size = 0
def _get_real_name_from_theme(self, name):
info = self._theme.lookup_icon(name, 50, 0)
if not info:
raise ValueError("Icon '" + name + "' not found.")
fname = info.get_filename()
del info
return fname
def _cache_cleanup(self, key, now):
while self._cache_size > self._CACHE_MAX:
evict_key = None
oldest_key = None
oldest_time = now
for icon_key, icon in self._icons.items():
# Don't evict the icon we are about to use if it's in the cache
if icon_key == key:
continue
# evict large icons first
if icon.data_size > self._CACHE_MAX:
evict_key = icon_key
break
# evict older icons next; those used over 2 minutes ago
if icon.last_used < now - 120:
evict_key = icon_key
break
# otherwise, evict the oldest
if oldest_time > icon.last_used:
oldest_time = icon.last_used
oldest_key = icon_key
# If there's nothing specific to evict, try evicting
# the oldest thing
if not evict_key:
if not oldest_key:
break
evict_key = oldest_key
self._cache_size -= self._icons[evict_key].data_size
del self._icons[evict_key]
def get_handle(self, name, fill_color, stroke_color):
if not name:
return None
if name[0:6] == "theme:":
name = self._get_real_name_from_theme(name[6:])
if fill_color or stroke_color:
key = (name, fill_color, stroke_color)
else:
key = name
# If we're over the cache limit, evict something from the cache
now = time.time()
self._cache_cleanup(key, now)
if self._icons.has_key(key):
icon = self._icons[key]
icon.usage_count += 1
icon.last_used = now
else:
icon = _IconCacheIcon(name, fill_color, stroke_color, now)
self._icons[key] = icon
self._cache_size += icon.data_size
return icon.handle
class CanvasIcon(hippo.CanvasBox, hippo.CanvasItem):
__gtype_name__ = 'CanvasIcon'
__gproperties__ = {
'icon-name' : (str, None, None, None,
gobject.PARAM_READWRITE),
'xo-color' : (object, None, None,
gobject.PARAM_WRITABLE),
'fill-color' : (object, None, None,
gobject.PARAM_READWRITE),
'stroke-color' : (object, None, None,
gobject.PARAM_READWRITE),
'scale' : (float, None, None,
0.0, 1024.0, units.STANDARD_ICON_SCALE,
gobject.PARAM_READWRITE),
'cache' : (bool, None, None, False,
gobject.PARAM_READWRITE),
'active' : (bool, None, None, True,
gobject.PARAM_READWRITE)
}
_cache = _IconCache()
def __init__(self, **kwargs):
self._buffers = {}
self._cur_buffer = None
self._scale = units.STANDARD_ICON_SCALE
self._fill_color = None
self._stroke_color = None
self._icon_name = None
self._cache = False
self._handle = None
self._active = True
self._palette = None
hippo.CanvasBox.__init__(self, **kwargs)
self.connect_after('motion-notify-event', self._motion_notify_event_cb)
def _clear_buffers(self):
cur_buf_key = self._get_current_buffer_key()
for key in self._buffers.keys():
if key != cur_buf_key:
del self._buffers[key]
self._buffers = {}
def do_set_property(self, pspec, value):
if pspec.name == 'icon-name':
if self._icon_name != value and not self._cache:
self._clear_buffers()
self._icon_name = value
self._handle = None
self.emit_paint_needed(0, 0, -1, -1)
elif pspec.name == 'xo-color':
self.props.fill_color = color.HTMLColor(value.get_fill_color())
self.props.stroke_color = color.HTMLColor(value.get_stroke_color())
elif pspec.name == 'fill-color':
if self._fill_color != value:
if not self._cache:
self._clear_buffers()
self._fill_color = value
self._handle = None
self.emit_paint_needed(0, 0, -1, -1)
elif pspec.name == 'stroke-color':
if self._stroke_color != value:
if not self._cache:
self._clear_buffers()
self._stroke_color = value
self._handle = None
self.emit_paint_needed(0, 0, -1, -1)
elif pspec.name == 'scale':
if self._scale != value and not self._cache:
self._clear_buffers()
self._scale = value
self.emit_request_changed()
elif pspec.name == 'cache':
self._cache = value
elif pspec.name == 'active':
if self._active != value:
if not self._cache:
self._clear_buffers()
self._active = value
self._handle = None
self.emit_paint_needed(0, 0, -1, -1)
def _choose_colors(self):
fill_color = None
stroke_color = None
if self._active:
if self._fill_color:
fill_color = self._fill_color.get_html()
if self._stroke_color:
stroke_color = self._stroke_color.get_html()
else:
stroke_color = color.ICON_STROKE_INACTIVE.get_html()
if self._fill_color:
fill_color = self._fill_color.get_html()
return [fill_color, stroke_color]
def _get_handle(self):
if not self._handle:
cache = CanvasIcon._cache
[fill_color, stroke_color] = self._choose_colors()
self._handle = cache.get_handle(self._icon_name, fill_color,
stroke_color)
return self._handle
def _get_current_buffer_key(self):
[fill_color, stroke_color] = self._choose_colors()
return (self._icon_name, fill_color, stroke_color, self._scale)
def do_get_property(self, pspec):
if pspec.name == 'scale':
return self._scale
elif pspec.name == 'icon-name':
return self._icon_name
elif pspec.name == 'fill-color':
return self._fill_color
elif pspec.name == 'stroke-color':
return self._stroke_color
elif pspec.name == 'cache':
return self._cache
elif pspec.name == 'active':
return self._active
def _get_icon_size(self):
handle = self._get_handle()
if handle:
dimensions = handle.get_dimension_data()
width = int(dimensions[0] * self._scale) + 1
height = int(dimensions[1] * self._scale) + 1
return [width, height]
return [0, 0]
def _get_buffer(self, cr, handle):
key = self._get_current_buffer_key()
buf = None
if self._buffers.has_key(key):
buf = self._buffers[key]
else:
target = cr.get_target()
[w, h] = self._get_icon_size()
buf = target.create_similar(cairo.CONTENT_COLOR_ALPHA, w, h)
ctx = cairo.Context(buf)
ctx.scale(self._scale, self._scale)
handle.render_cairo(ctx)
del ctx
self._buffers[key] = buf
return buf
def do_paint_below_children(self, cr, damaged_box):
handle = self._get_handle()
if handle == None:
return
buf = self._get_buffer(cr, handle)
[width, height] = self.get_allocation()
[icon_width, icon_height] = self._get_icon_size()
x = (width - icon_width) / 2
y = (height - icon_height) / 2
cr.set_source_surface(buf, x, y)
cr.paint()
def do_get_content_width_request(self):
[width, height] = self._get_icon_size()
return (width, width)
def do_get_content_height_request(self, for_width):
[width, height] = self._get_icon_size()
return (height, height)
def do_button_press_event(self, event):
self.emit_activated()
return True
def _motion_notify_event_cb(self, button, event):
if event.detail == hippo.MOTION_DETAIL_ENTER:
self.prelight(True)
elif event.detail == hippo.MOTION_DETAIL_LEAVE:
self.prelight(False)
return False
def prelight(self, enter):
"""
Override this method for adding prelighting behavior.
"""
pass
def get_palette(self):
return self._palette
def set_palette(self, palette):
self._palette = palette
self._palette.props.invoker = CanvasInvoker(self)
def set_tooltip(self, text):
self.set_palette(Palette(text))
palette = property(get_palette, set_palette)
def get_icon_state(base_name, perc):
step = 5
strength = round(perc / step) * step
icon_theme = gtk.icon_theme_get_default()
while strength <= 100:
icon_name = '%s-%03d' % (base_name, strength)
if icon_theme.has_icon(icon_name):
return 'theme:' + icon_name
strength = strength + step