import string
from Tkinter import *
import Pmw
import ColorDB


class LeftArrow:
    _ARROWWIDTH = 30
    _ARROWHEIGHT = 15
    _YOFFSET = 13
    _TEXTYOFFSET = 1
    _TAG = ('leftarrow',)

    def __init__(self, canvas, x):
	self._canvas = canvas
	self.__arrow, self.__text = self._create(x)
	self.move_to(x)

    def _create(self, x):
	arrow = self._canvas.create_line(
	    x, self._ARROWHEIGHT + self._YOFFSET,
	    x, self._YOFFSET,
	    x + self._ARROWWIDTH, self._YOFFSET,
	    arrow='first',
	    width=3.0,
	    tags=self._TAG)
	text = self._canvas.create_text(
	    x + self._ARROWWIDTH + 13,
	    self._ARROWHEIGHT - self._TEXTYOFFSET,
	    tags=self._TAG,
	    text='128')
	return arrow, text

    def _x(self):
	coords = self._canvas.coords(self._TAG)
	assert coords
	return coords[0]

    def move_to(self, x):
	deltax = x - self._x()
	self._canvas.move(self._TAG, deltax, 0)

    def set_text(self, text):
	self._canvas.itemconfigure(self.__text, text=text)


class RightArrow(LeftArrow):
    _TAG = ('rightarrow',)

    def _create(self, x):
	arrow = self._canvas.create_line(
	    x, self._YOFFSET,
	    x + self._ARROWWIDTH, self._YOFFSET,
	    x + self._ARROWWIDTH, self._ARROWHEIGHT + self._YOFFSET,
	    arrow='last',
	    width=3.0,
	    tags=self._TAG)
	text = self._canvas.create_text(
	    x - self._ARROWWIDTH + 15,		  # TBD: kludge
	    self._ARROWHEIGHT - self._TEXTYOFFSET,
	    text='128',
	    tags=self._TAG)
	return arrow, text

    def _x(self):
	coords = self._canvas.bbox(self._TAG)
	assert coords
	return coords[2] - 6			  # TBD: kludge



class StripWidget(Pmw.MegaWidget):
    _CHIPHEIGHT = 50
    _CHIPWIDTH = 10
    _NUMCHIPS = 40

    def __init__(self, parent=None, **kw):
	options = (('color',      (128, 128, 128),  self.__set_color),
		   ('delegate',   None,             self.__set_delegate),
		   ('chipwidth',  self._CHIPWIDTH,  Pmw.INITOPT),
		   ('chipheight', self._CHIPHEIGHT, Pmw.INITOPT),
		   ('numchips',   self._NUMCHIPS,   Pmw.INITOPT),
		   ('generator',  None,             Pmw.INITOPT),
		   ('axis',       None,             Pmw.INITOPT),
		   ('label',      '',               Pmw.INITOPT),
		   )
	self.defineoptions(kw, options)

	Pmw.MegaWidget.__init__(self, parent)
	interiorarg = (self.interior(),)

	# group component contains a convas containing a bunch of objects
	# (moveable arrow + text label, relief'd rectangle color chips)
	chipwidth = self.__chipwidth = self['chipwidth']
	chipheight = self.__chipheight = self['chipheight']
	numchips = self.__numchips = self['numchips']

	canvaswidth = numchips * (chipwidth + 1)
	canvasheight = chipheight + 43		  # TBD: Kludge

	# create the canvas and pack it
	self.__canvas = Canvas(
	    parent,
	    width=canvaswidth,
	    height=canvasheight,
## 	    borderwidth=2,
## 	    relief=GROOVE
	    )

	self.__canvas.pack()
	self.__canvas.bind('<ButtonRelease-1>',
			   self.__select_chip)
	self.__canvas.bind('<B1-Motion>',
			   self.__select_chip)

	# create the color strip
	chips = self.__chips = []
	x = 1
	y = 30
	for c in range(self.__numchips):
	    color = 'grey'
	    rect = self.__canvas.create_rectangle(
		x, y, x+chipwidth, y+chipheight,
		fill=color, outline=color)

	    x = x + chipwidth + 1		  # for outline
	    chips.append(color)

	# create the string tag
	self.__label = self.__canvas.create_text(
	    3, y + chipheight + 8,
	    text=self['label'],
	    anchor=W)

	# create the arrow and text item
	chipx = self.__arrow_x(0)
	self.__leftarrow = LeftArrow(self.__canvas, chipx)

	chipx = self.__arrow_x(len(chips) - 1)
	self.__rightarrow = RightArrow(self.__canvas, chipx)

	self.__generator = self['generator']
	self.__axis = self['axis']
	assert self.__axis in (0, 1, 2)
	self.initialiseoptions(StripWidget)
	self.__delegate = self['delegate']

    def __set_color(self):
	rgbtuple = self['color']
	self.set_color(self, rgbtuple)

    def __arrow_x(self, chipnum):
	coords = self.__canvas.coords(chipnum+1)
	assert coords
	x0, y0, x1, y1 = coords
	return (x1 + x0) / 2.0

    def __select_chip(self, event=None):
	chip = self.__canvas.find_closest(event.x, event.y)[0]
	if chip and self.__delegate:
	    color = self.__chips[chip-1]
	    rgbtuple = ColorDB.rrggbb_to_triplet(color)
	    self.__delegate.set_color(self, rgbtuple)

## 	    import profile
## 	    import pstats
## 	    import tempfile
## 	    statfile = tempfile.mktemp()
## 	    p = profile.Profile()
## 	    p.runcall(self.__delegate.set_color, self, rgbtuple)
## 	    p.dump_stats(statfile)
## 	    s = pstats.Stats(statfile)
## 	    s.strip_dirs().sort_stats('time').print_stats(10)

    def __set_delegate(self):
	self.__delegate = self['delegate']
	

    #
    # public interface
    #

    def set_color(self, obj, rgbtuple):
	red, green, blue = rgbtuple
	assert self.__generator
	i = 1
	chip = 0
	chips = self.__chips = []
	tclcmd = []
	for t in self.__generator(self.__numchips, rgbtuple):
	    rrggbb = ColorDB.triplet_to_rrggbb(t)
	    chips.append(rrggbb)
## 	    self.__canvas.itemconfigure(i,
## 					fill=rrggbb,
## 					outline=rrggbb)
	    tclcmd.append(self.__canvas._w)
	    tclcmd.append('itemconfigure')
	    tclcmd.append(`i`)
	    tclcmd.append('-fill')
	    tclcmd.append(rrggbb)
	    tclcmd.append('-outline')
	    tclcmd.append(rrggbb)
	    tclcmd.append('\n')
	    tred, tgreen, tblue = t
	    if tred <= red and tgreen <= green and tblue <= blue:
		chip = i
	    i = i + 1
	# call the raw tcl script
	script = string.join(tclcmd, ' ')
	self.__canvas.tk.eval(script)

	# get the arrow's text
	coloraxis = rgbtuple[self.__axis]
	text = repr(coloraxis)

	# move the arrow, and set it's text
	if coloraxis <= 128:
	    # use the left chip
	    self.__leftarrow.set_text(text)
	    self.__leftarrow.move_to(self.__arrow_x(chip-1))
	    self.__rightarrow.move_to(-100)
	else:
	    # use the right chip
	    self.__rightarrow.set_text(text)
	    self.__rightarrow.move_to(self.__arrow_x(chip-1))
	    self.__leftarrow.move_to(-100)
	# and set the chip's outline
	pmwrgb = ColorDB.triplet_to_pmwrgb(rgbtuple)
	b = Pmw.Color.rgb2brightness(pmwrgb)
	if b <= 0.5:
	    outline = 'white'
	else:
	    outline = 'black'
	self.__canvas.itemconfigure(chip, outline=outline)