import skin
from HTMLComponent import *
from GUIComponent import *
from enigma import eLabel, eWidget, eSlider, fontRenderClass, ePoint, eSize

class ScrollLabel(HTMLComponent, GUIComponent):
	def __init__(self, text=""):
		self.message = text
		self.instance = None
		self.long_text = None
		self.scrollbar = None
		self.pages = None
		self.total = None

	def applySkin(self, desktop):
		skin.applyAllAttributes(self.long_text, desktop, self.skinAttributes)
		s = self.long_text.size()
		self.instance.move(self.long_text.position())
		self.scrollbar.move(ePoint(s.width()-20,0))
		self.scrollbar.resize(eSize(20,s.height()))
		self.scrollbar.setOrientation(eSlider.orVertical);
		self.scrollbar.setRange(0,100)
		lineheight=fontRenderClass.getInstance().getLineHeight( self.long_text.getFont() )
		lines = (int)(s.height() / lineheight)
		self.pageHeight = (int)(lines * lineheight)
		self.instance.resize(eSize(s.width(), self.pageHeight+(int)(lineheight/6)))
		self.long_text.move(ePoint(0,0))
		self.long_text.resize(eSize(s.width()-30, self.pageHeight*16))
		self.setText(self.message)

	def setText(self, text):
		self.message = text
		if self.long_text is not None:
			self.long_text.move(ePoint(0,0))
			self.long_text.setText(self.message)
			text_height=self.long_text.calculateSize().height()
			total=self.pageHeight
			pages=1
			while total < text_height:
				total=total+self.pageHeight
				pages=pages+1
			if pages > 1:
				self.scrollbar.show()
				self.total = total
				self.pages = pages
				self.updateScrollbar()
			else:
				self.scrollbar.hide()
				self.total = None
				self.pages = None

	def updateScrollbar(self):
		start = -self.long_text.position().y() * 100 / self.total
		vis = self.pageHeight * 100 / self.total;
		self.scrollbar.setStartEnd(start, start+vis)

	def getText(self):
		return self.message

	def GUIcreate(self, parent):
		self.instance = eWidget(parent)
		self.scrollbar = eSlider(self.instance)
		self.long_text = eLabel(self.instance)

	def GUIdelete(self):
		self.long_text = None
		self.scrollbar = None
		self.instance = None

	def pageUp(self):
		if self.total is not None:
			curPos = self.long_text.position()
			if curPos.y() < 0:
				self.long_text.move( ePoint( curPos.x(), curPos.y() + self.pageHeight ) )
				self.updateScrollbar()

	def pageDown(self):
		if self.total is not None:
			curPos = self.long_text.position()
			if self.total-self.pageHeight >= abs( curPos.y() - self.pageHeight ):
				self.long_text.move( ePoint( curPos.x(), curPos.y() - self.pageHeight ) )
				self.updateScrollbar()

	def produceHTML(self):
		return self.getText()