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| 1 | +from Tkinter import * |
| 2 | +import Pmw |
| 3 | +import ColorDB |
| 4 | + |
| 5 | +class LeftArrow: |
| 6 | + _ARROWWIDTH = 30 |
| 7 | + _ARROWHEIGHT = 15 |
| 8 | + _YOFFSET = 13 |
| 9 | + _TEXTYOFFSET = 1 |
| 10 | + _TAG = ('leftarrow',) |
| 11 | + |
| 12 | + def __init__(self, canvas, x): |
| 13 | + self._canvas = canvas |
| 14 | + self.__arrow, self.__text = self._create(x) |
| 15 | + self.move_to(x) |
| 16 | + |
| 17 | + def _create(self, x): |
| 18 | + arrow = self._canvas.create_line( |
| 19 | + x, self._ARROWHEIGHT + self._YOFFSET, |
| 20 | + x, self._YOFFSET, |
| 21 | + x + self._ARROWWIDTH, self._YOFFSET, |
| 22 | + arrow='first', |
| 23 | + width=3.0, |
| 24 | + tags=self._TAG) |
| 25 | + text = self._canvas.create_text( |
| 26 | + x + self._ARROWWIDTH + 13, |
| 27 | + self._ARROWHEIGHT - self._TEXTYOFFSET, |
| 28 | + text='128') |
| 29 | + return arrow, text |
| 30 | + |
| 31 | + def _x(self): |
| 32 | + coords = self._canvas.coords(self._TAG) |
| 33 | + assert coords |
| 34 | + return coords[0] |
| 35 | + |
| 36 | + def move_to(self, x): |
| 37 | + deltax = x - self._x() |
| 38 | + self._canvas.move(self._TAG, deltax, 0) |
| 39 | + |
| 40 | + |
| 41 | +class RightArrow(LeftArrow): |
| 42 | + _TAG = ('rightarrow',) |
| 43 | + |
| 44 | + def _create(self, x): |
| 45 | + arrow = self._canvas.create_line( |
| 46 | + x, self._YOFFSET, |
| 47 | + x + self._ARROWWIDTH, self._YOFFSET, |
| 48 | + x + self._ARROWWIDTH, self._ARROWHEIGHT + self._YOFFSET, |
| 49 | + arrow='last', |
| 50 | + width=3.0, |
| 51 | + tags=self._TAG) |
| 52 | + text = self._canvas.create_text( |
| 53 | + x - self._ARROWWIDTH - 20, # TBD: kludge |
| 54 | + self._ARROWHEIGHT - self._TEXTYOFFSET, |
| 55 | + text='128') |
| 56 | + return arrow, text |
| 57 | + |
| 58 | + def _x(self): |
| 59 | + coords = self._canvas.bbox(self._TAG) |
| 60 | + assert coords |
| 61 | + return coords[2] - 6 # TBD: kludge |
| 62 | + |
| 63 | + |
| 64 | + |
| 65 | +class StripWidget(Pmw.MegaWidget): |
| 66 | + _CHIPHEIGHT = 50 |
| 67 | + _CHIPWIDTH = 10 |
| 68 | + _NUMCHIPS = 40 |
| 69 | + |
| 70 | + def __init__(self, parent=None, **kw): |
| 71 | + options = (('color', (128, 128, 128), self.__set_color), |
| 72 | + ('delegate', None, None), |
| 73 | + ('chipwidth', self._CHIPWIDTH, Pmw.INITOPT), |
| 74 | + ('chipheight', self._CHIPHEIGHT, Pmw.INITOPT), |
| 75 | + ('numchips', self._NUMCHIPS, Pmw.INITOPT), |
| 76 | + ('generator', None, Pmw.INITOPT), |
| 77 | + ) |
| 78 | + self.defineoptions(kw, options) |
| 79 | + |
| 80 | + Pmw.MegaWidget.__init__(self, parent) |
| 81 | + interiorarg = (self.interior(),) |
| 82 | + |
| 83 | + # group component contains a convas containing a bunch of objects |
| 84 | + # (moveable arrow + text label, relief'd rectangle color chips) |
| 85 | + chipwidth = self.__chipwidth = self['chipwidth'] |
| 86 | + chipheight = self.__chipheight = self['chipheight'] |
| 87 | + numchips = self.__numchips = self['numchips'] |
| 88 | + |
| 89 | + canvaswidth = numchips * (chipwidth + 1) |
| 90 | + canvasheight = chipheight + 35 |
| 91 | + |
| 92 | + self.__canvas = Canvas( |
| 93 | + parent, |
| 94 | + width=canvaswidth, |
| 95 | + height=canvasheight) |
| 96 | + self.__canvas.pack() |
| 97 | + |
| 98 | + # create the color strip |
| 99 | + chips = self.__chips = [] |
| 100 | + x = 1 |
| 101 | + y = 30 |
| 102 | + for c in range(self.__numchips): |
| 103 | + rect = self.__canvas.create_rectangle( |
| 104 | + x, y, x+chipwidth, y+chipheight, |
| 105 | + fill='grey', outline='grey') |
| 106 | + |
| 107 | + x = x + chipwidth + 1 # for outline |
| 108 | + chips.append(rect) |
| 109 | + |
| 110 | + # create the arrow and text item |
| 111 | + chipx = self.__arrow_x(0) |
| 112 | + self.__leftarrow = LeftArrow(self.__canvas, chipx) |
| 113 | + |
| 114 | + chipx = self.__arrow_x(len(chips) - 1) |
| 115 | + self.__rightarrow = RightArrow(self.__canvas, chipx) |
| 116 | + |
| 117 | + self.__generator = self['generator'] |
| 118 | + self.initialiseoptions(StripWidget) |
| 119 | + |
| 120 | + def __set_color(self): |
| 121 | + rgbtuple = self['color'] |
| 122 | + if self.__generator: |
| 123 | + i = 0 |
| 124 | + for t in self.__generator(self.__numchips, rgbtuple): |
| 125 | + rrggbb = ColorDB.triplet_to_rrggbb(t) |
| 126 | + self.__canvas.itemconfigure(self.__chips[i], |
| 127 | + fill=rrggbb, |
| 128 | + outline=rrggbb) |
| 129 | + i = i + 1 |
| 130 | + |
| 131 | + def __arrow_x(self, chipnum): |
| 132 | + coords = self.__canvas.coords(self.__chips[chipnum]) |
| 133 | + assert coords |
| 134 | + x0, y0, x1, y1 = coords |
| 135 | + return (x1 + x0) / 2.0 |
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