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Python Source  |  2000-09-28  |  4.2 KB  |  110 lines
  1. """Chip viewer and widget.
  2.  
  3. In the lower left corner of the main Pynche window, you will see two
  4. ChipWidgets, one for the selected color and one for the nearest color.  The
  5. selected color is the actual RGB value expressed as an X11 #COLOR name. The
  6. nearest color is the named color from the X11 database that is closest to the
  7. selected color in 3D space.  There may be other colors equally close, but the
  8. nearest one is the first one found.
  9.  
  10. Clicking on the nearest color chip selects that named color.
  11.  
  12. The ChipViewer class includes the entire lower left quandrant; i.e. both the
  13. selected and nearest ChipWidgets.
  14. """
  15.  
  16. from types import StringType
  17. from Tkinter import *
  18. import ColorDB
  19.  
  20.  
  21. class ChipWidget:
  22.     _WIDTH = 150
  23.     _HEIGHT = 80
  24.  
  25.     def __init__(self,
  26.                  master = None,
  27.                  width  = _WIDTH,
  28.                  height = _HEIGHT,
  29.                  text   = 'Color',
  30.                  initialcolor = 'blue',
  31.                  presscmd   = None,
  32.                  releasecmd = None):
  33.         # create the text label
  34.         self.__label = Label(master, text=text)
  35.         self.__label.grid(row=0, column=0)
  36.         # create the color chip, implemented as a frame
  37.         self.__chip = Frame(master, relief=RAISED, borderwidth=2,
  38.                             width=width,
  39.                             height=height,
  40.                             background=initialcolor)
  41.         self.__chip.grid(row=1, column=0)
  42.         # create the color name, ctor argument must be a string
  43.         self.__name = Label(master, text=initialcolor)
  44.         self.__name.grid(row=2, column=0)
  45.         #
  46.         # set bindings
  47.         if presscmd:
  48.             self.__chip.bind('<ButtonPress-1>', presscmd)
  49.         if releasecmd:
  50.             self.__chip.bind('<ButtonRelease-1>', releasecmd)
  51.  
  52.     def set_color(self, color, colorname=None):
  53.         self.__chip.config(background=color)
  54.         self.__name.config(text=colorname or color)
  55.  
  56.     def get_color(self):
  57.         return self.__chip['background']
  58.  
  59.     def press(self):
  60.         self.__chip.configure(relief=SUNKEN)
  61.  
  62.     def release(self):
  63.         self.__chip.configure(relief=RAISED)
  64.  
  65.  
  66.  
  67. class ChipViewer:
  68.     def __init__(self, switchboard, master=None):
  69.         self.__sb = switchboard
  70.         self.__frame = Frame(master, relief=RAISED, borderwidth=1)
  71.         self.__frame.grid(row=3, column=0, ipadx=5, sticky='NSEW')
  72.         # create the chip that will display the currently selected color
  73.         # exactly
  74.         self.__sframe = Frame(self.__frame)
  75.         self.__sframe.grid(row=0, column=0)
  76.         self.__selected = ChipWidget(self.__sframe, text='Selected')
  77.         # create the chip that will display the nearest real X11 color
  78.         # database color name
  79.         self.__nframe = Frame(self.__frame)
  80.         self.__nframe.grid(row=0, column=1)
  81.         self.__nearest = ChipWidget(self.__nframe, text='Nearest',
  82.                                     presscmd = self.__buttonpress,
  83.                                     releasecmd = self.__buttonrelease)
  84.  
  85.     def update_yourself(self, red, green, blue):
  86.         # Selected always shows the #rrggbb name of the color, nearest always
  87.         # shows the name of the nearest color in the database.  TBD: should
  88.         # an exact match be indicated in some way?
  89.         #
  90.         # Always use the #rrggbb style to actually set the color, since we may 
  91.         # not be using X color names (e.g. "web-safe" names)
  92.         colordb = self.__sb.colordb()
  93.         rgbtuple = (red, green, blue)
  94.         rrggbb = ColorDB.triplet_to_rrggbb(rgbtuple)
  95.         # find the nearest
  96.         nearest = colordb.nearest(red, green, blue)
  97.         nearest_tuple = colordb.find_byname(nearest)
  98.         nearest_rrggbb = ColorDB.triplet_to_rrggbb(nearest_tuple)
  99.         self.__selected.set_color(rrggbb)
  100.         self.__nearest.set_color(nearest_rrggbb, nearest)
  101.  
  102.     def __buttonpress(self, event=None):
  103.         self.__nearest.press()
  104.  
  105.     def __buttonrelease(self, event=None):
  106.         self.__nearest.release()
  107.         rrggbb = self.__nearest.get_color()
  108.         red, green, blue = ColorDB.rrggbb_to_triplet(rrggbb)
  109.         self.__sb.update_views(red, green, blue)
  110.