import skin

from enigma import ePoint, eSize

class GUIComponent(object):
	""" GUI component """

	def __init__(self):
		self.instance = None
		self.onVisibilityChange = [ ]
		self.__visible = 0
		self.visible = 1
		self.skinAttributes = None
		self.deprecationInfo = None

	def execBegin(self):
		pass

	def execEnd(self):
		pass

	def onShow(self):
		pass

	def onHide(self):
		pass

	def destroy(self):
		self.__dict__.clear()

	# this works only with normal widgets - if you don't have self.instance, override this.
	def applySkin(self, desktop, parent):
		if not self.visible:
			self.instance.hide()

		if self.skinAttributes is None:
			return False

		skin.applyAllAttributes(self.instance, desktop, self.skinAttributes, parent.scale)
		return True

	def move(self, x, y = None):
		# we assume, that x is already an ePoint
		if y is None:
			self.instance.move(x)
		else:
			self.instance.move(ePoint(int(x), int(y)))

	def resize(self, x, y = None):
		self.width = x
		self.height = y
		if y is None:
			self.instance.resize(x)
		else:
			self.instance.resize(eSize(int(x), int(y)))

	def setZPosition(self, z):
		self.instance.setZPosition(z)

	def show(self):
		old = self.__visible
		self.__visible = 1
		if self.instance is not None:
			self.instance.show()
		if old != self.__visible:
			for fnc in self.onVisibilityChange:
				fnc(True)

	def hide(self):
		old = self.__visible
		self.__visible = 0
		if self.instance is not None:
			self.instance.hide()
		if old != self.__visible:
			for fnc in self.onVisibilityChange:
				fnc(False)

	def getVisible(self):
		return self.__visible

	def setVisible(self, visible):
		if visible:
			self.show()
		else:
			self.hide()

	visible = property(getVisible, setVisible)

	def setPosition(self, x, y):
		self.instance.move(ePoint(int(x), int(y)))

	def getPosition(self):
		p = self.instance.position()
		return p.x(), p.y()

	def getWidth(self):
		return self.width

	def getHeight(self):
		return self.height

	position = property(getPosition, setPosition)

	# default implementation for only one widget per component
	# feel free to override!
	def GUIcreate(self, parent):
		self.instance = self.createWidget(parent)
		self.postWidgetCreate(self.instance)

	def GUIdelete(self):
		self.preWidgetRemove(self.instance)
		self.instance = None

	# default for argumentless widget constructor
	def createWidget(self, parent):
		return self.GUI_WIDGET(parent)

	def postWidgetCreate(self, instance):
		pass

	def preWidgetRemove(self, instance):
		pass