264 lines
8.1 KiB
Python
264 lines
8.1 KiB
Python
# Copyright (C) 2006, Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import re
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import gobject
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import gtk
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import hippo
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import rsvg
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import cairo
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import time
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from sugar.graphics.iconcolor import IconColor
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class _IconCacheIcon:
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def __init__(self, name, color, now):
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self.data_size = None
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self.handle = self._read_icon_data(name, color)
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self.last_used = now
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self.usage_count = 1
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def _read_icon_data(self, filename, color):
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icon_file = open(filename, 'r')
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data = icon_file.read()
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icon_file.close()
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if color:
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fill = color.get_fill_color()
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stroke = color.get_stroke_color()
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entity = '<!ENTITY fill_color "%s">' % fill
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data = re.sub('<!ENTITY fill_color .*>', entity, data)
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entity = '<!ENTITY stroke_color "%s">' % stroke
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data = re.sub('<!ENTITY stroke_color .*>', entity, data)
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self.data_size = len(data)
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return rsvg.Handle(data=data)
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class _IconCache:
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_CACHE_MAX = 50000 # in bytes
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def __init__(self):
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self._icons = {}
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self._theme = gtk.icon_theme_get_default()
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self._cache_size = 0
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def _get_real_name_from_theme(self, name):
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info = self._theme.lookup_icon(name, 50, 0)
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if not info:
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raise ValueError("Icon '" + name + "' not found.")
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fname = info.get_filename()
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del info
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return fname
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def _cache_cleanup(self, key, now):
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while self._cache_size > self._CACHE_MAX:
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evict_key = None
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oldest_key = None
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oldest_time = now
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for icon_key, icon in self._icons.items():
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# Don't evict the icon we are about to use if it's in the cache
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if icon_key == key:
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continue
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# evict large icons first
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if icon.data_size > self._CACHE_MAX:
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evict_key = icon_key
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break
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# evict older icons next; those used over 2 minutes ago
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if icon.last_used < now - 120:
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evict_key = icon_key
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break
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# otherwise, evict the oldest
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if oldest_time > icon.last_used:
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oldest_time = icon.last_used
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oldest_key = icon_key
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# If there's nothing specific to evict, try evicting
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# the oldest thing
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if not evict_key:
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if not oldest_key:
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break
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evict_key = oldest_key
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self._cache_size -= self._icons[evict_key].data_size
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del self._icons[evict_key]
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def get_handle(self, name, color):
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if name == None:
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return None
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if name[0:6] == "theme:":
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name = self._get_real_name_from_theme(name[6:])
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if color:
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key = (name, color.to_string())
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else:
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key = name
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# If we're over the cache limit, evict something from the cache
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now = time.time()
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self._cache_cleanup(key, now)
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if self._icons.has_key(key):
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icon = self._icons[key]
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icon.usage_count += 1
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icon.last_used = now
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else:
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icon = _IconCacheIcon(name, color, now)
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self._icons[key] = icon
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self._cache_size += icon.data_size
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return icon.handle
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class CanvasIcon(hippo.CanvasBox, hippo.CanvasItem):
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__gtype_name__ = 'CanvasIcon'
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__gproperties__ = {
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'icon-name': (str, None, None, None,
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gobject.PARAM_READWRITE),
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'color' : (object, None, None,
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gobject.PARAM_READWRITE),
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'scale' : (float, None, None,
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0.0, 1024.0, 1.0,
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gobject.PARAM_READWRITE),
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'cache' : (bool, None, None, False,
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gobject.PARAM_READWRITE)
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}
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_cache = _IconCache()
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def __init__(self, **kwargs):
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self._buffers = {}
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self._cur_buffer = None
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self._scale = 1.0
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self._color = None
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self._icon_name = None
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self._cache = False
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self._handle = None
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hippo.CanvasBox.__init__(self, **kwargs)
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self.connect('button-press-event', self._button_press_event_cb)
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def _clear_buffers(self):
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cur_buf_key = self._get_current_buffer_key()
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for key in self._buffers.keys():
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if key != cur_buf_key:
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del self._buffers[key]
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self._buffers = {}
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def do_set_property(self, pspec, value):
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if pspec.name == 'icon-name':
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if self._icon_name != value and not self._cache:
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self._clear_buffers()
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self._icon_name = value
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self._handle = None
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self.emit_paint_needed(0, 0, -1, -1)
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elif pspec.name == 'color':
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if self._color != value and not self._cache:
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self._clear_buffers()
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self._color = value
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self._handle = None
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self.emit_paint_needed(0, 0, -1, -1)
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elif pspec.name == 'scale':
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if self._scale != value and not self._cache:
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self._clear_buffers()
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self._scale = value
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self.emit_request_changed()
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elif pspec.name == 'cache':
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self._cache = value
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def _get_handle(self):
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if not self._handle:
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cache = CanvasIcon._cache
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self._handle = cache.get_handle(self._icon_name, self._color)
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return self._handle
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def _get_current_buffer_key(self):
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return (self._icon_name, self._color, self._scale)
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def do_get_property(self, pspec):
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if pspec.name == 'scale':
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return self._scale
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elif pspec.name == 'icon-name':
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return self._icon_name
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elif pspec.name == 'color':
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return self._color
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elif pspec.name == 'cache':
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return self._cache
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def _get_icon_size(self):
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handle = self._get_handle()
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if handle:
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dimensions = handle.get_dimension_data()
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width = int(dimensions[0] * self._scale) + 1
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height = int(dimensions[1] * self._scale) + 1
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return [width, height]
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return [0, 0]
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def _get_buffer(self, cr, handle):
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key = self._get_current_buffer_key()
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buf = None
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if self._buffers.has_key(key):
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buf = self._buffers[key]
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else:
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target = cr.get_target()
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[w, h] = self._get_icon_size()
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buf = target.create_similar(cairo.CONTENT_COLOR_ALPHA, w, h)
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ctx = cairo.Context(buf)
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ctx.scale(self._scale, self._scale)
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handle.render_cairo(ctx)
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del ctx
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self._buffers[key] = buf
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return buf
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def do_paint_below_children(self, cr, damaged_box):
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handle = self._get_handle()
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if handle == None:
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return
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buf = self._get_buffer(cr, handle)
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[width, height] = self.get_allocation()
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[icon_width, icon_height] = self._get_icon_size()
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x = (width - icon_width) / 2
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y = (height - icon_height) / 2
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cr.set_source_surface(buf, x, y)
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cr.paint()
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def do_get_content_width_request(self):
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[width, height] = self._get_icon_size()
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return width
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def do_get_content_height_request(self, for_width):
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[width, height] = self._get_icon_size()
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return height
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def _button_press_event_cb(self, item, event):
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item.emit_activated()
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