blog.sunjay-varma.com

from Tkinter import *

class CanvasList(Canvas):
	def __init__(self, master=None, width=100, height=500, items=None, itemheight=None, **canvasOptions):
		Canvas.__init__(self, master, width=width, height=height, **canvasOptions)

		self.config(width=width, height=height)		# dimensions

		self.config(highlightthickness=0)				   # no pixels to border

		sbar = Scrollbar(self)
		sbar.config(command=self.yview)				   # xlink sbar and canv
		self.config(yscrollcommand=sbar.set)			   # move one moves other
		sbar.pack(side=RIGHT, fill=Y)					  # pack first=clip last
		self.pack(side=LEFT)		# canv clipped first

		self.width = width
		self.height = height
		self.itemheight = itemheight or (items and height/len(items))

		self.items = items or None
		self.itemIds = []

		self.y = 0
		self.add_items()

	def add_item(self, body, y):
		body['width'] = int(self.width); body['height'] = int(y)
		if body not in self.items: self.items.append(body)
		self.itemIds.append(self.create_window(int(0),int(y), window=body, width=self.width, height=self.itemheight))
		return len(self.itemIds)-1

	def add_items(self, items):
		if items or self.items:
			for item in items or self.items:
				self.add_item(item, -self.y)
				self.y -= self.itemheight

		self.config(scrollregion=(0,0,width, self.scrollheight(items or self.items)))

	def scrollheight(self, items=None):
		items = items or self.items
		if items:
			return len(items)*self.itemheight
			print 'scroll: ', len(items)*self.itemheight
		else:
			print items, 'items'
			return self.height

if __name__ == "__main__":
	root = Tk()
	root.title("Canvas List")

	def printitem(i): print str(i)

	items = []

	for i in range(20):
		frm = Frame()
		Label(frm, text="Lab"+str(i)).pack(side=LEFT, expand=YES, fill=BOTH)
		Button(frm, text=str(i), command=(lambda i=i: printitem(i))).pack(side=RIGHT, expand=YES, fill=BOTH)

		items.append(frm)

	can = CanvasList(root, width=200, height=500, items=items)
	print can.itemheight
	can.pack()
	root.mainloop()