skin.py

from Tools.Profile import profile
profile("LOAD:ElementTree")
import xml.etree.cElementTree
import os

profile("LOAD:enigma_skin")
from enigma import eSize, ePoint, eRect, gFont, eWindow, eLabel, ePixmap, eWindowStyleManager, \
	addFont, gRGB, eWindowStyleSkinned, getDesktop
from Components.config import ConfigSubsection, ConfigText, config
from Components.Converter.Converter import Converter
from Components.Sources.Source import Source, ObsoleteSource
from Tools.Directories import resolveFilename, SCOPE_SKIN, SCOPE_SKIN_IMAGE, SCOPE_FONTS, SCOPE_CURRENT_SKIN, SCOPE_CONFIG, fileExists
from Tools.Import import my_import
from Tools.LoadPixmap import LoadPixmap
from Components.RcModel import rc_model

colorNames = {}
# Predefined fonts, typically used in built-in screens and for components like
# the movie list and so.
fonts = {
	"Body": ("Regular", 18, 22, 16),
	"ChoiceList": ("Regular", 20, 24, 18),
}

def dump(x, i=0):
	print " " * i + str(x)
	try:
		for n in x.childNodes:
			dump(n, i + 1)
	except:
		None

class SkinError(Exception):
	def __init__(self, message):
		self.msg = message

	def __str__(self):
		return "{%s}: %s. Please contact the skin's author!" % (config.skin.primary_skin.value, self.msg)

dom_skins = [ ]

def addSkin(name, scope = SCOPE_SKIN):
	# read the skin
	filename = resolveFilename(scope, name)
	if fileExists(filename):
		mpath = os.path.dirname(filename) + "/"
		dom_skins.append((mpath, xml.etree.cElementTree.parse(filename).getroot()))
		return True
	return False

# get own skin_user_skinname.xml file, if exist
def skin_user_skinname():
	name = "skin_user_" + config.skin.primary_skin.value[:config.skin.primary_skin.value.rfind('/')] + ".xml"
	filename = resolveFilename(SCOPE_CONFIG, name)
	if fileExists(filename):
		return name
	return None

# we do our best to always select the "right" value
# skins are loaded in order of priority: skin with
# highest priority is loaded last, usually the user-provided
# skin.

# currently, loadSingleSkinData (colors, bordersets etc.)
# are applied one-after-each, in order of ascending priority.
# the dom_skin will keep all screens in descending priority,
# so the first screen found will be used.

# example: loadSkin("nemesis_greenline/skin.xml")
config.skin = ConfigSubsection()
DEFAULT_SKIN = "TechniHD/skin.xml"
# on SD hardware, PLi-HD will not be available
if not fileExists(resolveFilename(SCOPE_SKIN, DEFAULT_SKIN)):
	# in that case, fallback to PLi-HD (which is an SD skin)
	DEFAULT_SKIN = "PLi-HD/skin.xml"
config.skin.primary_skin = ConfigText(default=DEFAULT_SKIN)

profile("LoadSkin")
try:
	name = skin_user_skinname()
	if name is not None:
		addSkin(name, SCOPE_CONFIG)
	else:
		addSkin('skin_user.xml', SCOPE_CONFIG)
except (SkinError, IOError, AssertionError), err:
	print "not loading user skin: ", err

# some boxes lie about their dimensions
addSkin('skin_box.xml')
# add optional discrete second infobar
addSkin('skin_second_infobar.xml')
# Only one of these is present, compliments of AM_CONDITIONAL
display_skin_id = 1
addSkin('skin_display.xml')
if addSkin('skin_display96.xml'):
	# Color OLED
	display_skin_id = 2
addSkin('skin_text.xml')

addSkin('skin_subtitles.xml')

try:
	if not addSkin(config.skin.primary_skin.value):
		raise SkinError, "primary skin not found"
except Exception, err:
	print "SKIN ERROR:", err
	skin = DEFAULT_SKIN
	if config.skin.primary_skin.value == skin:
		skin = 'skin.xml'
	print "defaulting to standard skin...", skin
	config.skin.primary_skin.value = skin
	addSkin(skin)
	del skin

addSkin('skin_default.xml')
profile("LoadSkinDefaultDone")

def parseCoordinate(s, e, size=0, font=None):
	s = s.strip()
	if s == "center":
		val = (e - size)/2
	elif s == '*':
	        return None
	else:
		if s[0] is 'e':
			val = e
			s = s[1:]
		elif s[0] is 'c':
			val = e/2
			s = s[1:]
		else:
			val = 0;
		if s:
			if s[-1] is '%':
				val += e * int(s[:-1]) / 100
			elif s[-1] is 'w':
			        val += fonts[font][3] * int(s[:-1]);
			elif s[-1] is 'h':
			        val += fonts[font][2] * int(s[:-1]);
			else:
				val += int(s)
	if val < 0:
		val = 0
	return val


def getParentSize(object, desktop):
	size = eSize()
	if object:
		parent = object.getParent()
		# For some widgets (e.g. ScrollLabel) the skin attributes are applied to
		# a child widget, instead of to the widget itself. In that case, the parent
		# we have here is not the real parent, but it is the main widget.
		# We have to go one level higher to get the actual parent.
		# We can detect this because the 'parent' will not have a size yet
		# (the main widget's size will be calculated internally, as soon as the child
		# widget has parsed the skin attributes)
		if parent and parent.size().isEmpty():
			parent = parent.getParent()
		if parent:
			size = parent.size()
		elif desktop:
			#widget has no parent, use desktop size instead for relative coordinates
			size = desktop.size()
	return size

def parsePosition(s, scale, object = None, desktop = None, size = None):
	x, y = s.split(',')
	parentsize = eSize()
	if object and (x[0] in ('c', 'e') or y[0] in ('c', 'e')):
		parentsize = getParentSize(object, desktop)
	xval = parseCoordinate(x, parentsize.width(), size and size.width())
	yval = parseCoordinate(y, parentsize.height(), size and size.height())
	return ePoint(xval * scale[0][0] / scale[0][1], yval * scale[1][0] / scale[1][1])

def parseSize(s, scale, object = None, desktop = None):
	x, y = s.split(',')
	parentsize = eSize()
	if object and (x[0] in ('c', 'e') or y[0] in ('c', 'e')):
		parentsize = getParentSize(object, desktop)
	xval = parseCoordinate(x, parentsize.width())
	yval = parseCoordinate(y, parentsize.height())
	return eSize(xval * scale[0][0] / scale[0][1], yval * scale[1][0] / scale[1][1])

def parseFont(s, scale):
	try:
		f = fonts[s]
		name = f[0]
		size = f[1]
	except:
		name, size = s.split(';')
	return gFont(name, int(size) * scale[0][0] / scale[0][1])

def parseColor(s):
	if s[0] != '#':
		try:
			return colorNames[s]
		except:
			raise SkinError("color '%s' must be #aarrggbb or valid named color" % (s))
	return gRGB(int(s[1:], 0x10))

def collectAttributes(skinAttributes, node, context, skin_path_prefix=None, ignore=(), filenames=frozenset(("pixmap", "pointer", "seek_pointer", "backgroundPixmap", "selectionPixmap", "sliderPixmap", "scrollbarbackgroundPixmap"))):
	# walk all attributes
	size = None
	pos = None
	font = None
	for attrib, value in node.items():
		if attrib not in ignore:
			if attrib in filenames:
				value = resolveFilename(SCOPE_SKIN_IMAGE, value, path_prefix=skin_path_prefix)
			# Bit of a hack this, really. When a window has a flag (e.g. wfNoBorder)
			# it needs to be set at least before the size is set, in order for the
			# window dimensions to be calculated correctly in all situations.
			# If wfNoBorder is applied after the size has been set, the window will fail to clear the title area.
			# Similar situation for a scrollbar in a listbox; when the scrollbar setting is applied after
			# the size, a scrollbar will not be shown until the selection moves for the first time
			if attrib == 'size':
			        size = value.encode("utf-8")
			elif attrib == 'position':
			        pos = value.encode("utf-8")
			elif attrib == 'font':
			        font = value.encode("utf-8")
			        skinAttributes.append((attrib, font))
			else:
				skinAttributes.append((attrib, value.encode("utf-8")))
	if pos is not None:
		pos, size = context.parse(pos, size, font)
		skinAttributes.append(('position', pos))
	if size is not None:
		skinAttributes.append(('size', size))

def morphRcImagePath(value):
	if rc_model.rcIsDefault() is False:
		if value == '/usr/share/enigma2/skin_default/rc.png' or value == '/usr/share/enigma2/skin_default/rcold.png':
			value = rc_model.getRcLocation() + 'rc.png'
	return value

def loadPixmap(path, desktop):
	option = path.find("#")
	if option != -1:
		path = path[:option]
	ptr = LoadPixmap(morphRcImagePath(path), desktop)
	if ptr is None:
		raise SkinError("pixmap file %s not found!" % (path))
	return ptr

class AttributeParser:
	def __init__(self, guiObject, desktop, scale = ((1,1),(1,1))):
		self.guiObject = guiObject
		self.desktop = desktop
		self.scale = scale
	def applyOne(self, attrib, value):
		try:
			getattr(self, attrib)(value)
		except AttributeError:
			print "[Skin] Attribute not implemented:", attrib, "value:", value
		except SkinError, ex:
			print "[Skin] Error:", ex
	def applyAll(self, attrs):
		for attrib, value in attrs:
			try:
				getattr(self, attrib)(value)
			except AttributeError:
				print "[Skin] Attribute not implemented:", attrib, "value:", value
			except SkinError, ex:
				print "[Skin] Error:", ex
	def conditional(self, value):
		pass
	def position(self, value):
		if isinstance(value, tuple):
			self.guiObject.move(ePoint(*value))
		else:
			self.guiObject.move(parsePosition(value, self.scale, self.guiObject, self.desktop, self.guiObject.csize()))
	def size(self, value):
		if isinstance(value, tuple):
			self.guiObject.resize(eSize(*value))
		else:
			self.guiObject.resize(parseSize(value, self.scale, self.guiObject, self.desktop))
	def title(self, value):
		self.guiObject.setTitle(_(value))
	def text(self, value):
		self.guiObject.setText(_(value))
	def font(self, value):
		self.guiObject.setFont(parseFont(value, self.scale))
	def zPosition(self, value):
		self.guiObject.setZPosition(int(value))
	def itemHeight(self, value):
		self.guiObject.setItemHeight(int(value))
	def pixmap(self, value):
		ptr = loadPixmap(value, self.desktop)
		self.guiObject.setPixmap(ptr)
	def backgroundPixmap(self, value):
		ptr = loadPixmap(value, self.desktop)
		self.guiObject.setBackgroundPicture(ptr)
	def selectionPixmap(self, value):
		ptr = loadPixmap(value, self.desktop)
		self.guiObject.setSelectionPicture(ptr)
	def sliderPixmap(self, value):
		ptr = loadPixmap(value, self.desktop)
		self.guiObject.setSliderPicture(ptr)
	def scrollbarbackgroundPixmap(self, value):
		ptr = loadPixmap(value, self.desktop)
		self.guiObject.setScrollbarBackgroundPicture(ptr)
	def alphatest(self, value):
		self.guiObject.setAlphatest(
			{ "on": 1,
			  "off": 0,
			  "blend": 2,
			}[value])
	def scale(self, value):
		self.guiObject.setScale(1)
	def orientation(self, value): # used by eSlider
		try:
			self.guiObject.setOrientation(*
				{ "orVertical": (self.guiObject.orVertical, False),
					"orTopToBottom": (self.guiObject.orVertical, False),
					"orBottomToTop": (self.guiObject.orVertical, True),
					"orHorizontal": (self.guiObject.orHorizontal, False),
					"orLeftToRight": (self.guiObject.orHorizontal, False),
					"orRightToLeft": (self.guiObject.orHorizontal, True),
				}[value])
		except KeyError:
			print "oprientation must be either orVertical or orHorizontal!"
	def valign(self, value):
		try:
			self.guiObject.setVAlign(
				{ "top": self.guiObject.alignTop,
					"center": self.guiObject.alignCenter,
					"bottom": self.guiObject.alignBottom
				}[value])
		except KeyError:
			print "valign must be either top, center or bottom!"
	def halign(self, value):
		try:
			self.guiObject.setHAlign(
				{ "left": self.guiObject.alignLeft,
					"center": self.guiObject.alignCenter,
					"right": self.guiObject.alignRight,
					"block": self.guiObject.alignBlock
				}[value])
		except KeyError:
			print "halign must be either left, center, right or block!"
	def textOffset(self, value):
		x, y = value.split(',')
		self.guiObject.setTextOffset(ePoint(int(x) * self.scale[0][0] / self.scale[0][1], int(y) * self.scale[1][0] / self.scale[1][1]))
	def flags(self, value):
		flags = value.split(',')
		for f in flags:
			try:
				fv = eWindow.__dict__[f]
				self.guiObject.setFlag(fv)
			except KeyError:
				print "illegal flag %s!" % f
	def backgroundColor(self, value):
		self.guiObject.setBackgroundColor(parseColor(value))
	def backgroundColorSelected(self, value):
		self.guiObject.setBackgroundColorSelected(parseColor(value))
	def foregroundColor(self, value):
		self.guiObject.setForegroundColor(parseColor(value))
	def foregroundColorSelected(self, value):
		self.guiObject.setForegroundColorSelected(parseColor(value))
	def shadowColor(self, value):
		self.guiObject.setShadowColor(parseColor(value))
	def selectionDisabled(self, value):
		self.guiObject.setSelectionEnable(0)
	def transparent(self, value):
		self.guiObject.setTransparent(int(value))
	def borderColor(self, value):
		self.guiObject.setBorderColor(parseColor(value))
	def borderWidth(self, value):
		self.guiObject.setBorderWidth(int(value))
	def scrollbarMode(self, value):
		self.guiObject.setScrollbarMode(getattr(self.guiObject, value))
		#	{ "showOnDemand": self.guiObject.showOnDemand,
		#		"showAlways": self.guiObject.showAlways,
		#		"showNever": self.guiObject.showNever,
		#		"showLeft": self.guiObject.showLeft
		#	}[value])
	def enableWrapAround(self, value):
		self.guiObject.setWrapAround(True)
	def itemHeight(self, value):
		self.guiObject.setItemHeight(int(value))
	def pointer(self, value):
		(name, pos) = value.split(':')
		pos = parsePosition(pos, self.scale)
		ptr = loadPixmap(name, self.desktop)
		self.guiObject.setPointer(0, ptr, pos)
	def seek_pointer(self, value):
		(name, pos) = value.split(':')
		pos = parsePosition(pos, self.scale)
		ptr = loadPixmap(name, self.desktop)
		self.guiObject.setPointer(1, ptr, pos)
	def shadowOffset(self, value):
		self.guiObject.setShadowOffset(parsePosition(value, self.scale))
	def noWrap(self, value):
		self.guiObject.setNoWrap(1)

def applySingleAttribute(guiObject, desktop, attrib, value, scale = ((1,1),(1,1))):
	# Someone still using applySingleAttribute?
	AttributeParser(guiObject, desktop, scale).applyOne(attrib, value)

def applyAllAttributes(guiObject, desktop, attributes, scale):
	AttributeParser(guiObject, desktop, scale).applyAll(attributes)

def loadSingleSkinData(desktop, skin, path_prefix):
	"""loads skin data like colors, windowstyle etc."""
	assert skin.tag == "skin", "root element in skin must be 'skin'!"
	for c in skin.findall("output"):
		id = c.attrib.get('id')
		if id:
			id = int(id)
		else:
			id = 0
		if id == 0: # framebuffer
			for res in c.findall("resolution"):
				get_attr = res.attrib.get
				xres = get_attr("xres")
				if xres:
					xres = int(xres)
				else:
					xres = 720
				yres = get_attr("yres")
				if yres:
					yres = int(yres)
				else:
					yres = 576
				bpp = get_attr("bpp")
				if bpp:
					bpp = int(bpp)
				else:
					bpp = 32
				#print "Resolution:", xres,yres,bpp
				from enigma import gMainDC
				gMainDC.getInstance().setResolution(xres, yres)
				desktop.resize(eSize(xres, yres))
				if bpp != 32:
					# load palette (not yet implemented)
					pass

	for skininclude in skin.findall("include"):
		filename = skininclude.attrib.get("filename")
		if filename:
			skinfile = resolveFilename(SCOPE_CURRENT_SKIN, filename, path_prefix=path_prefix)
			if not fileExists(skinfile):
				skinfile = resolveFilename(SCOPE_SKIN_IMAGE, filename, path_prefix=path_prefix)
			if fileExists(skinfile):
				print "[SKIN] loading include:", skinfile
				loadSkin(skinfile)

	for c in skin.findall("colors"):
		for color in c.findall("color"):
			get_attr = color.attrib.get
			name = get_attr("name")
			color = get_attr("value")
			if name and color:
				colorNames[name] = parseColor(color)
				#print "Color:", name, color
			else:
				raise SkinError("need color and name, got %s %s" % (name, color))

	for c in skin.findall("fonts"):
		for font in c.findall("font"):
			get_attr = font.attrib.get
			filename = get_attr("filename", "<NONAME>")
			name = get_attr("name", "Regular")
			scale = get_attr("scale")
			if scale:
				scale = int(scale)
			else:
				scale = 100
			is_replacement = get_attr("replacement") and True or False
			render = get_attr("render")
			if render:
				render = int(render)
			else:
				render = 0
			resolved_font = resolveFilename(SCOPE_FONTS, filename, path_prefix=path_prefix)
			if not fileExists(resolved_font): #when font is not available look at current skin path
				skin_path = resolveFilename(SCOPE_CURRENT_SKIN, filename)
				if fileExists(skin_path):
					resolved_font = skin_path
			addFont(resolved_font, name, scale, is_replacement, render)
			#print "Font: ", resolved_font, name, scale, is_replacement
		for alias in c.findall("alias"):
		        get = alias.attrib.get
		        try:
				name = get("name")
				font = get("font")
				size = int(get("size"))
				height = int(get("height", size)) # to be calculated some day
				width = int(get("width", size))
				global fonts
				fonts[name] = (font, size, height, width)
			except Exception, ex:
				print "[SKIN] bad font alias", ex


	for c in skin.findall("subtitles"):
		from enigma import eWidget, eSubtitleWidget
		scale = ((1,1),(1,1))
		for substyle in c.findall("sub"):
			get_attr = substyle.attrib.get
			font = parseFont(get_attr("font"), scale)
			col = get_attr("foregroundColor")
			if col:
				foregroundColor = parseColor(col)
				haveColor = 1
			else:
				foregroundColor = gRGB(0xFFFFFF)
				haveColor = 0
			col = get_attr("borderColor")
			if col:
				borderColor = parseColor(col)
			else:
				borderColor = gRGB(0)
			borderwidth = get_attr("borderWidth")
			if borderwidth is None:
				# default: use a subtitle border
				borderWidth = 3
			else:
				borderWidth = int(borderwidth)
			face = eSubtitleWidget.__dict__[get_attr("name")]
			eSubtitleWidget.setFontStyle(face, font, haveColor, foregroundColor, borderColor, borderWidth)

	for windowstyle in skin.findall("windowstyle"):
		style = eWindowStyleSkinned()
		style_id = windowstyle.attrib.get("id")
		if style_id:
			style_id = int(style_id)
		else:
			style_id = 0
		# defaults
		font = gFont("Regular", 20)
		offset = eSize(20, 5)
		for title in windowstyle.findall("title"):
			get_attr = title.attrib.get
			offset = parseSize(get_attr("offset"), ((1,1),(1,1)))
			font = parseFont(get_attr("font"), ((1,1),(1,1)))

		style.setTitleFont(font);
		style.setTitleOffset(offset)
		#print "  ", font, offset
		for borderset in windowstyle.findall("borderset"):
			bsName = str(borderset.attrib.get("name"))
			for pixmap in borderset.findall("pixmap"):
				get_attr = pixmap.attrib.get
				bpName = get_attr("pos")
				filename = get_attr("filename")
				if filename and bpName:
					png = loadPixmap(resolveFilename(SCOPE_SKIN_IMAGE, filename, path_prefix=path_prefix), desktop)
					style.setPixmap(eWindowStyleSkinned.__dict__[bsName], eWindowStyleSkinned.__dict__[bpName], png)
				#print "  borderset:", bpName, filename
		for color in windowstyle.findall("color"):
			get_attr = color.attrib.get
			colorType = get_attr("name")
			color = parseColor(get_attr("color"))
			try:
				style.setColor(eWindowStyleSkinned.__dict__["col" + colorType], color)
			except:
				raise SkinError("Unknown color %s" % (colorType))
				#pass
			#print "  color:", type, color
		x = eWindowStyleManager.getInstance()
		x.setStyle(style_id, style)
	for margin in skin.findall("margin"):
		style_id = margin.attrib.get("id")
		if style_id:
			style_id = int(style_id)
		else:
			style_id = 0
		r = eRect(0,0,0,0)
		v = margin.attrib.get("left")
		if v:
			r.setLeft(int(v))
		v = margin.attrib.get("top")
		if v:
			r.setTop(int(v))
		v = margin.attrib.get("right")
		if v:
			r.setRight(int(v))
		v = margin.attrib.get("bottom")
		if v:
			r.setBottom(int(v))
		# the "desktop" parameter is hardcoded to the UI screen, so we must ask
		# for the one that this actually applies to.
		getDesktop(style_id).setMargins(r)

dom_screens = {}

def loadSkin(name, scope = SCOPE_SKIN):
	# Now a utility for plugins to add skin data to the screens
	global dom_screens, display_skin_id
	filename = resolveFilename(scope, name)
	if fileExists(filename):
		path = os.path.dirname(filename) + "/"
		for elem in xml.etree.cElementTree.parse(filename).getroot():
			if elem.tag == 'screen':
				name = elem.attrib.get('name', None)
				if name:
					sid = elem.attrib.get('id', None)
					if sid and (sid != display_skin_id):
						# not for this display
						elem.clear()
						continue
					if name in dom_screens:
						print "loadSkin: Screen already defined elsewhere:", name
						elem.clear()
					else:
						dom_screens[name] = (elem, path)
				else:
					elem.clear()
			else:
				elem.clear()

def loadSkinData(desktop):
	# Kinda hackish, but this is called once by mytest.py
	global dom_skins
	skins = dom_skins[:]
	skins.reverse()
	for (path, dom_skin) in skins:
		loadSingleSkinData(desktop, dom_skin, path)
		for elem in dom_skin:
			if elem.tag == 'screen':
				name = elem.attrib.get('name', None)
				if name:
					sid = elem.attrib.get('id', None)
					if sid and (sid != display_skin_id):
						# not for this display
						elem.clear()
						continue
					if name in dom_screens:
						# Kill old versions, save memory
						dom_screens[name][0].clear()
					dom_screens[name] = (elem, path)
				else:
					# without name, it's useless!
					elem.clear()
			else:
				# non-screen element, no need for it any longer
				elem.clear()
	# no longer needed, we know where the screens are now.
	del dom_skins

class additionalWidget:
	pass

# Class that makes a tuple look like something else. Some plugins just assume
# that size is a string and try to parse it. This class makes that work.
class SizeTuple(tuple):
	def split(self, *args):
		return (str(self[0]), str(self[1]))
	def strip(self, *args):
		return '%s,%s' % self
	def __str__(self):
		return '%s,%s' % self

class SkinContext:
	def __init__(self, parent=None, pos=None, size=None, font=None):
	        if parent is not None:
			if pos is not None:
				pos, size = parent.parse(pos, size, font)
				self.x, self.y = pos
				self.w, self.h = size
			else:
				self.x = None
				self.y = None
				self.w = None
				self.h = None
	def __str__(self):
	        return "Context (%s,%s)+(%s,%s) " % (self.x, self.y, self.w, self.h)
	def parse(self, pos, size, font):
	        if pos == "fill":
	                pos = (self.x, self.y)
	                size = (self.w, self.h)
	                self.w = 0
	                self.h = 0
		else:
			w,h = size.split(',')
			w = parseCoordinate(w, self.w, 0, font)
			h = parseCoordinate(h, self.h, 0, font)
			if pos == "bottom":
			        pos = (self.x, self.y + self.h - h)
			        size = (self.w, h)
			        self.h -= h
			elif pos == "top":
			        pos = (self.x, self.y)
			        size = (self.w, h)
			        self.h -= h
			        self.y += h
			elif pos == "left":
				pos = (self.x, self.y)
				size = (w, self.h)
				self.x += w
				self.w -= w
			elif pos == "right":
				pos = (self.x + self.w - w, self.y)
				size = (w, self.h)
				self.w -= w
			else:
				size = (w, h)
				pos = pos.split(',')
				pos = (self.x + parseCoordinate(pos[0], self.w, size[0], font), self.y + parseCoordinate(pos[1], self.h, size[1], font))
		return (SizeTuple(pos), SizeTuple(size))

class SkinContextStack(SkinContext):
	# A context that stacks things instead of aligning them
	def parse(self, pos, size, font):
	        if pos == "fill":
	                pos = (self.x, self.y)
	                size = (self.w, self.h)
		else:
			w,h = size.split(',')
			w = parseCoordinate(w, self.w, 0, font)
			h = parseCoordinate(h, self.h, 0, font)
			if pos == "bottom":
			        pos = (self.x, self.y + self.h - h)
			        size = (self.w, h)
			elif pos == "top":
			        pos = (self.x, self.y)
			        size = (self.w, h)
			elif pos == "left":
				pos = (self.x, self.y)
				size = (w, self.h)
			elif pos == "right":
				pos = (self.x + self.w - w, self.y)
				size = (w, self.h)
			else:
				size = (w, h)
				pos = pos.split(',')
				pos = (self.x + parseCoordinate(pos[0], self.w, size[0], font), self.y + parseCoordinate(pos[1], self.h, size[1], font))
		return (SizeTuple(pos), SizeTuple(size))

def readSkin(screen, skin, names, desktop):
	if not isinstance(names, list):
		names = [names]

	# try all skins, first existing one have priority
	global dom_screens
	for n in names:
		myscreen, path = dom_screens.get(n, (None,None))
		if myscreen is not None:
			# use this name for debug output
			name = n
			break
	else:
		name = "<embedded-in-'%s'>" % screen.__class__.__name__

	# otherwise try embedded skin
	if myscreen is None:
		myscreen = getattr(screen, "parsedSkin", None)

	# try uncompiled embedded skin
	if myscreen is None and getattr(screen, "skin", None):
		skin = screen.skin
		print "[SKIN] Parsing embedded skin", name
		if (isinstance(skin, tuple)):
			for s in skin:
				candidate = xml.etree.cElementTree.fromstring(s)
				if candidate.tag == 'screen':
					sid = candidate.attrib.get('id', None)
					if (not sid) or (int(sid) == display_skin_id):
						myscreen = candidate
						break;
			else:
				print "[SKIN] Hey, no suitable screen!"
		else:
			myscreen = xml.etree.cElementTree.fromstring(skin)
		if myscreen:
			screen.parsedSkin = myscreen
	if myscreen is None:
		print "[SKIN] No skin to read..."
		myscreen = screen.parsedSkin = xml.etree.cElementTree.fromstring("<screen></screen>")

	screen.skinAttributes = [ ]
	skin_path_prefix = getattr(screen, "skin_path", path)

	context = SkinContextStack()
	s = desktop.bounds()
	context.x = s.left()
	context.y = s.top()
	context.w = s.width()
	context.h = s.height()
	del s
	collectAttributes(screen.skinAttributes, myscreen, context, skin_path_prefix, ignore=("name",))
	context = SkinContext(context, myscreen.attrib.get('position'), myscreen.attrib.get('size'))

	screen.additionalWidgets = [ ]
	screen.renderer = [ ]
	visited_components = set()

	# now walk all widgets and stuff
	def process_none(widget, context):
	        pass

	def process_widget(widget, context):
		get_attr = widget.attrib.get
		# ok, we either have 1:1-mapped widgets ('old style'), or 1:n-mapped
		# widgets (source->renderer).
		wname = get_attr('name')
		wsource = get_attr('source')
		if wname is None and wsource is None:
			print "widget has no name and no source!"
			return
		if wname:
			#print "Widget name=", wname
			visited_components.add(wname)
			# get corresponding 'gui' object
			try:
				attributes = screen[wname].skinAttributes = [ ]
			except:
				raise SkinError("component with name '" + wname + "' was not found in skin of screen '" + name + "'!")
			# assert screen[wname] is not Source
			collectAttributes(attributes, widget, context, skin_path_prefix, ignore=('name',))
		elif wsource:
			# get corresponding source
			#print "Widget source=", wsource
			while True: # until we found a non-obsolete source
				# parse our current "wsource", which might specifiy a "related screen" before the dot,
				# for example to reference a parent, global or session-global screen.
				scr = screen
				# resolve all path components
				path = wsource.split('.')
				while len(path) > 1:
					scr = screen.getRelatedScreen(path[0])
					if scr is None:
						#print wsource
						#print name
						raise SkinError("specified related screen '" + wsource + "' was not found in screen '" + name + "'!")
					path = path[1:]
				# resolve the source.
				source = scr.get(path[0])
				if isinstance(source, ObsoleteSource):
					# however, if we found an "obsolete source", issue warning, and resolve the real source.
					print "WARNING: SKIN '%s' USES OBSOLETE SOURCE '%s', USE '%s' INSTEAD!" % (name, wsource, source.new_source)
					print "OBSOLETE SOURCE WILL BE REMOVED %s, PLEASE UPDATE!" % (source.removal_date)
					if source.description:
						print source.description
					wsource = source.new_source
				else:
					# otherwise, use that source.
					break

			if source is None:
				raise SkinError("source '" + wsource + "' was not found in screen '" + name + "'!")

			wrender = get_attr('render')
			if not wrender:
				raise SkinError("you must define a renderer with render= for source '%s'" % (wsource))
			for converter in widget.findall("convert"):
				ctype = converter.get('type')
				assert ctype, "'convert'-tag needs a 'type'-attribute"
				#print "Converter:", ctype
				try:
					parms = converter.text.strip()
				except:
					parms = ""
				#print "Params:", parms
				converter_class = my_import('.'.join(("Components", "Converter", ctype))).__dict__.get(ctype)
				c = None
				for i in source.downstream_elements:
					if isinstance(i, converter_class) and i.converter_arguments == parms:
						c = i
				if c is None:
					c = converter_class(parms)
					c.connect(source)
				source = c

			renderer_class = my_import('.'.join(("Components", "Renderer", wrender))).__dict__.get(wrender)
			renderer = renderer_class() # instantiate renderer
			renderer.connect(source) # connect to source
			attributes = renderer.skinAttributes = [ ]
			collectAttributes(attributes, widget, context, skin_path_prefix, ignore=('render', 'source'))
			screen.renderer.append(renderer)

	def process_applet(widget, context):
		try:
			codeText = widget.text.strip()
			widgetType = widget.attrib.get('type')
			code = compile(codeText, "skin applet", "exec")
		except Exception, ex:
			raise SkinError("applet failed to compile: " + str(ex))
		if widgetType == "onLayoutFinish":
			screen.onLayoutFinish.append(code)
		else:
			raise SkinError("applet type '%s' unknown!" % widgetType)

	def process_elabel(widget, context):
		w = additionalWidget()
		w.widget = eLabel
		w.skinAttributes = [ ]
		collectAttributes(w.skinAttributes, widget, context, skin_path_prefix, ignore=('name',))
		screen.additionalWidgets.append(w)

	def process_epixmap(widget, context):
		w = additionalWidget()
		w.widget = ePixmap
		w.skinAttributes = [ ]
		collectAttributes(w.skinAttributes, widget, context, skin_path_prefix, ignore=('name',))
		screen.additionalWidgets.append(w)

	def process_screen(widget, context):
		for w in widget.getchildren():
			conditional = w.attrib.get('conditional')
			if conditional and not [i for i in conditional.split(",") if i in screen.keys()]:
				continue
			p = processors.get(w.tag, process_none)
			try:
				p(w, context)
			except SkinError, e:
				print "[Skin] SKIN ERROR in screen '%s' widget '%s':" % (name, w.tag), e

	def process_panel(widget, context):
		n = widget.attrib.get('name')
		if n:
			try:
				s = dom_screens[n]
			except KeyError:
				print "[SKIN] Unable to find screen '%s' referred in screen '%s'" % (n, name)
			else:
				process_screen(s[0], context)
		layout = widget.attrib.get('layout')
		if layout == 'stack':
			cc = SkinContextStack
		else:
		        cc = SkinContext
		try:
			c = cc(context, widget.attrib.get('position'), widget.attrib.get('size'), widget.attrib.get('font'))
		except Exception, ex:
		        raise SkinError("Failed to create skincontext (%s,%s,%s) in %s: %s" % (widget.attrib.get('position'), widget.attrib.get('size'), widget.attrib.get('font'), context, ex) )
		process_screen(widget, c)

	processors = {
	        None: process_none,
	        "widget": process_widget,
	        "applet": process_applet,
	        "eLabel": process_elabel,
	        "ePixmap": process_epixmap,
	        "panel": process_panel
	}

	try:
		context.x = 0 # reset offsets, all components are relative to screen
		context.y = 0 # coordinates.
		process_screen(myscreen, context)
	except Exception, e:
		print "[Skin] SKIN ERROR in %s:" % name, e

	from Components.GUIComponent import GUIComponent
	nonvisited_components = [x for x in set(screen.keys()) - visited_components if isinstance(x, GUIComponent)]
	assert not nonvisited_components, "the following components in %s don't have a skin entry: %s" % (name, ', '.join(nonvisited_components))
	# This may look pointless, but it unbinds 'screen' from the nested scope. A better
	# solution is to avoid the nested scope above and use the context object to pass
	# things around.
	screen = None
	visited_components = None