136 lines
3.4 KiB
Python
136 lines
3.4 KiB
Python
from Tkinter import *
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import Pmw
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import ColorDB
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class LeftArrow:
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_ARROWWIDTH = 30
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_ARROWHEIGHT = 15
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_YOFFSET = 13
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_TEXTYOFFSET = 1
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_TAG = ('leftarrow',)
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def __init__(self, canvas, x):
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self._canvas = canvas
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self.__arrow, self.__text = self._create(x)
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self.move_to(x)
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def _create(self, x):
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arrow = self._canvas.create_line(
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x, self._ARROWHEIGHT + self._YOFFSET,
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x, self._YOFFSET,
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x + self._ARROWWIDTH, self._YOFFSET,
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arrow='first',
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width=3.0,
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tags=self._TAG)
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text = self._canvas.create_text(
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x + self._ARROWWIDTH + 13,
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self._ARROWHEIGHT - self._TEXTYOFFSET,
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text='128')
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return arrow, text
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def _x(self):
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coords = self._canvas.coords(self._TAG)
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assert coords
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return coords[0]
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def move_to(self, x):
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deltax = x - self._x()
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self._canvas.move(self._TAG, deltax, 0)
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class RightArrow(LeftArrow):
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_TAG = ('rightarrow',)
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def _create(self, x):
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arrow = self._canvas.create_line(
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x, self._YOFFSET,
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x + self._ARROWWIDTH, self._YOFFSET,
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x + self._ARROWWIDTH, self._ARROWHEIGHT + self._YOFFSET,
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arrow='last',
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width=3.0,
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tags=self._TAG)
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text = self._canvas.create_text(
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x - self._ARROWWIDTH - 20, # TBD: kludge
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self._ARROWHEIGHT - self._TEXTYOFFSET,
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text='128')
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return arrow, text
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def _x(self):
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coords = self._canvas.bbox(self._TAG)
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assert coords
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return coords[2] - 6 # TBD: kludge
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class StripWidget(Pmw.MegaWidget):
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_CHIPHEIGHT = 50
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_CHIPWIDTH = 10
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_NUMCHIPS = 40
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def __init__(self, parent=None, **kw):
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options = (('color', (128, 128, 128), self.__set_color),
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('delegate', None, None),
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('chipwidth', self._CHIPWIDTH, Pmw.INITOPT),
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('chipheight', self._CHIPHEIGHT, Pmw.INITOPT),
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('numchips', self._NUMCHIPS, Pmw.INITOPT),
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('generator', None, Pmw.INITOPT),
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)
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self.defineoptions(kw, options)
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Pmw.MegaWidget.__init__(self, parent)
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interiorarg = (self.interior(),)
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# group component contains a convas containing a bunch of objects
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# (moveable arrow + text label, relief'd rectangle color chips)
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chipwidth = self.__chipwidth = self['chipwidth']
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chipheight = self.__chipheight = self['chipheight']
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numchips = self.__numchips = self['numchips']
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canvaswidth = numchips * (chipwidth + 1)
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canvasheight = chipheight + 35
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self.__canvas = Canvas(
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parent,
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width=canvaswidth,
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height=canvasheight)
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self.__canvas.pack()
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# create the color strip
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chips = self.__chips = []
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x = 1
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y = 30
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for c in range(self.__numchips):
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rect = self.__canvas.create_rectangle(
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x, y, x+chipwidth, y+chipheight,
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fill='grey', outline='grey')
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x = x + chipwidth + 1 # for outline
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chips.append(rect)
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# create the arrow and text item
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chipx = self.__arrow_x(0)
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self.__leftarrow = LeftArrow(self.__canvas, chipx)
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chipx = self.__arrow_x(len(chips) - 1)
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self.__rightarrow = RightArrow(self.__canvas, chipx)
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self.__generator = self['generator']
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self.initialiseoptions(StripWidget)
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def __set_color(self):
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rgbtuple = self['color']
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if self.__generator:
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i = 0
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for t in self.__generator(self.__numchips, rgbtuple):
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rrggbb = ColorDB.triplet_to_rrggbb(t)
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self.__canvas.itemconfigure(self.__chips[i],
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fill=rrggbb,
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outline=rrggbb)
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i = i + 1
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def __arrow_x(self, chipnum):
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coords = self.__canvas.coords(self.__chips[chipnum])
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assert coords
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x0, y0, x1, y1 = coords
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return (x1 + x0) / 2.0
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