canvas.py

minimal python variant for small footprint apps like embedded apps

# This module exports classes for the various canvas item types

from Tkinter import Canvas, _cnfmerge, _flatten


class CanvasItem:
	def __init__(self, canvas, itemType, *args, **kw):
		self.canvas = canvas
		self.id = canvas._create(itemType, args, kw)
		if not hasattr(canvas, 'items'):
			canvas.items = {}
		canvas.items[self.id] = self
	def __str__(self):
		return str(self.id)
	def __repr__(self):
		return '<%s, id=%d>' % (self.__class__.__name__, self.id)
	def delete(self):
		del self.canvas.items[self.id]
		self.canvas.delete(self.id)
	def __getitem__(self, key):
		v = self.canvas.tk.split(self.canvas.tk.call(
			self.canvas._w, 'itemconfigure',
			self.id, '-' + key))
		return v[4]
	cget = __getitem__
	def __setitem__(self, key, value):
		self.canvas.itemconfig(self.id, {key: value})
	def keys(self):
		if not hasattr(self, '_keys'):
			self._keys = map(lambda x, tk=self.canvas.tk:
					 tk.splitlist(x)[0][1:],
					 self.canvas.tk.splitlist(
						 self.canvas._do(
							 'itemconfigure',
							 (self.id,))))
		return self._keys
	def has_key(self, key):
		return key in self.keys()
	def addtag(self, tag, option='withtag'):
		self.canvas.addtag(tag, option, self.id)
	def bbox(self):
		x1, y1, x2, y2 = self.canvas.bbox(self.id)
		return (x1, y1), (x2, y2)
	def bind(self, sequence=None, command=None):
		return self.canvas.tag_bind(self.id, sequence, command)
	def unbind(self, sequence):
		self.canvas.tag_bind(self.id, sequence, '')
	def config(self, cnf={}, **kw):
		return self.canvas.itemconfig(self.id, _cnfmerge((cnf, kw)))
	def coords(self, pts = ()):
		flat = ()
		for x, y in pts: flat = flat + (x, y)
		return apply(self.canvas.coords, (self.id,) + flat)
	def dchars(self, first, last=None):
		self.canvas.dchars(self.id, first, last)
	def dtag(self, ttd):
		self.canvas.dtag(self.id, ttd)
	def focus(self):
		self.canvas.focus(self.id)
	def gettags(self):
		return self.canvas.gettags(self.id)
	def icursor(self, index):
		self.canvas.icursor(self.id, index)
	def index(self, index):
		return self.canvas.index(self.id, index)
	def insert(self, beforethis, string):
		self.canvas.insert(self.id, beforethis, string)
	def lower(self, belowthis=None):
		self.canvas.lower(self.id, belowthis)
	def move(self, xamount, yamount):
		self.canvas.move(self.id, xamount, yamount)
	def tkraise(self, abovethis=None):
		self.canvas.tkraise(self.id, abovethis)
	raise_ = tkraise # BW compat
	def scale(self, xorigin, yorigin, xscale, yscale):
		self.canvas.scale(self.id, xorigin, yorigin, xscale, yscale)
	def type(self):
		return self.canvas.type(self.id)

class Arc(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'arc') + args, kw)

class Bitmap(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'bitmap') + args, kw)

class ImageItem(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'image') + args, kw)

class Line(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'line') + args, kw)

class Oval(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'oval') + args, kw)

class Polygon(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'polygon') + args,kw)

class Rectangle(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'rectangle')+args,kw)

# XXX "Text" is taken by the Text widget...
class CanvasText(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'text') + args, kw)

class Window(CanvasItem):
	def __init__(self, canvas, *args, **kw):
		apply(CanvasItem.__init__, (self, canvas, 'window') + args, kw)

class Group:
	def __init__(self, canvas, tag=None):
		if not tag:
			tag = 'Group%d' % id(self)
		self.tag = self.id = tag
		self.canvas = canvas
		self.canvas.dtag(self.tag)
	def str(self):
		return self.tag
	__str__ = str
	def _do(self, cmd, *args):
		return self.canvas._do(cmd, (self.tag,) + _flatten(args))
	def addtag_above(self, tagOrId):
		self._do('addtag', 'above', tagOrId)
	def addtag_all(self):
		self._do('addtag', 'all')
	def addtag_below(self, tagOrId):
		self._do('addtag', 'below', tagOrId)
	def addtag_closest(self, x, y, halo=None, start=None):
		self._do('addtag', 'closest', x, y, halo, start)
	def addtag_enclosed(self, x1, y1, x2, y2):
		self._do('addtag', 'enclosed', x1, y1, x2, y2)
	def addtag_overlapping(self, x1, y1, x2, y2):
		self._do('addtag', 'overlapping', x1, y1, x2, y2)
	def addtag_withtag(self, tagOrId):
		self._do('addtag', 'withtag', tagOrId)
	def bbox(self):
		return self.canvas._getints(self._do('bbox'))
	def bind(self, sequence=None, command=None):
		return self.canvas.tag_bind(self.id, sequence, command)
	def unbind(self, sequence):
		self.canvas.tag_bind(self.id, sequence, '')
	def coords(self, *pts):
		return self._do('coords', pts)
	def dchars(self, first, last=None):
		self._do('dchars', first, last)
	def delete(self):
		self._do('delete')
	def dtag(self, tagToDelete=None):
		self._do('dtag', tagToDelete)
	def focus(self):
		self._do('focus')
	def gettags(self):
		return self.canvas.tk.splitlist(self._do('gettags', self.tag))
	def icursor(self, index):
		return self._do('icursor', index)
	def index(self, index):
		return self.canvas.tk.getint(self._do('index', index))
	def insert(self, beforeThis, string):
		self._do('insert', beforeThis, string)
	def config(self, cnf={}, **kw):
		return self.canvas.itemconfigure(self.tag, _cnfmerge((cnf,kw)))
	def lower(self, belowThis=None):
		self._do('lower', belowThis)
	def move(self, xAmount, yAmount):
		self._do('move', xAmount, yAmount)
	def tkraise(self, aboveThis=None):
		self._do('raise', aboveThis)
	lift = tkraise
	def scale(self, xOrigin, yOrigin, xScale, yScale):
		self._do('scale', xOrigin, yOrigin, xScale, yScale)
	def select_adjust(self, index):
		self.canvas._do('select', ('adjust', self.tag, index))
	def select_from(self, index):
		self.canvas._do('select', ('from', self.tag, index))
	def select_to(self, index):
		self.canvas._do('select', ('to', self.tag, index))
	def type(self):
		return self._do('type')