Initial revision

Tools/pynche/StripViewer.py

+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,
+	    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)
+
+
+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 - 20,		  # TBD: kludge
+	    self._ARROWHEIGHT - self._TEXTYOFFSET,
+	    text='128')
+	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, None),
+		   ('chipwidth', self._CHIPWIDTH, Pmw.INITOPT),
+		   ('chipheight', self._CHIPHEIGHT, Pmw.INITOPT),
+		   ('numchips', self._NUMCHIPS, Pmw.INITOPT),
+		   ('generator', None, 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 + 35
+
+	self.__canvas = Canvas(
+	    parent,
+	    width=canvaswidth,
+	    height=canvasheight)
+	self.__canvas.pack()
+
+	# create the color strip
+	chips = self.__chips = []
+	x = 1
+	y = 30
+	for c in range(self.__numchips):
+	    rect = self.__canvas.create_rectangle(
+		x, y, x+chipwidth, y+chipheight,
+		fill='grey', outline='grey')
+
+	    x = x + chipwidth + 1		  # for outline
+	    chips.append(rect)
+
+	# 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.initialiseoptions(StripWidget)
+
+    def __set_color(self):
+	rgbtuple = self['color']
+	if self.__generator:
+	    i = 0
+	    for t in self.__generator(self.__numchips, rgbtuple):
+		rrggbb = ColorDB.triplet_to_rrggbb(t)
+		self.__canvas.itemconfigure(self.__chips[i],
+					    fill=rrggbb,
+					    outline=rrggbb)
+		i = i + 1
+	
+    def __arrow_x(self, chipnum):
+	coords = self.__canvas.coords(self.__chips[chipnum])
+	assert coords
+	x0, y0, x1, y1 = coords
+	return (x1 + x0) / 2.0