cpython/Tools/pynche/ChipViewer.py

from types import StringType
from Tkinter import *
import ColorDB


class ChipWidget:
    _WIDTH = 150
    _HEIGHT = 80

    def __init__(self,
                 parent = None,
                 width  = _WIDTH,
                 height = _HEIGHT,
                 text   = 'Color',
                 initialcolor = 'blue',
                 presscmd   = None,
                 releasecmd = None):
        # create the text label
        self.__label = Label(parent, text=text)
        self.__label.grid(row=0, column=0)
        # create the color chip, implemented as a frame
        self.__chip = Frame(parent, relief=RAISED, borderwidth=2,
                            width=width,
                            height=height,
                            background=initialcolor)
        self.__chip.grid(row=1, column=0)
        # create the color name, ctor argument must be a string
        self.__name = Label(parent, text=initialcolor)
        self.__name.grid(row=2, column=0)
        #
        # set bindings
        if presscmd:
            self.__chip.bind('<ButtonPress-1>', presscmd)
        if releasecmd:
            self.__chip.bind('<ButtonRelease-1>', releasecmd)

    def set_color(self, color):
        self.__chip.config(background=color)
        self.__name.config(text=color)

    def get_color(self):
        return self.__chip['background']

    def press(self):
        self.__chip.configure(relief=SUNKEN)

    def release(self):
        self.__chip.configure(relief=RAISED)



class ChipViewer:
    def __init__(self, switchboard, parent=None):
        self.__sb = switchboard
        self.__frame = Frame(parent) #, relief=GROOVE, borderwidth=2)
        self.__frame.grid(row=3, column=0)
        # create the chip that will display the currently selected color
        # exactly
        self.__sframe = Frame(self.__frame)
        self.__sframe.grid(row=0, column=0)
        self.__selected = ChipWidget(self.__sframe, text='Selected')
        # create the chip that will display the nearest real X11 color
        # database color name
        self.__nframe = Frame(self.__frame)
        self.__nframe.grid(row=0, column=1)
        self.__nearest = ChipWidget(self.__nframe, text='Nearest',
                                    presscmd = self.__buttonpress,
                                    releasecmd = self.__buttonrelease)
        self.__div = Frame(self.__frame,
                           width=2,
                           borderwidth=2,
                           relief=RAISED)
        self.__div.grid(row=0, column=2, sticky='NS', padx=5)

    def update_yourself(self, red, green, blue):
        # TBD: should exactname default to X11 color name if their is an exact
        # match for the rgb triplet?  Part of me says it's nice to see both
        # names for the color, the other part says that it's better to
        # feedback the exact match.
        rgbtuple = (red, green, blue)
        try:
            allcolors = self.__sb.colordb().find_byrgb(rgbtuple)
            exactname = allcolors[0]
        except ColorDB.BadColor:
            exactname = ColorDB.triplet_to_rrggbb(rgbtuple)
        nearest = self.__sb.colordb().nearest(red, green, blue)
        self.__selected.set_color(exactname)
        self.__nearest.set_color(nearest)

    def __buttonpress(self, event=None):
        self.__nearest.press()

    def __buttonrelease(self, event=None):
        self.__nearest.release()
        colorname = self.__nearest.get_color()
        red, green, blue = self.__sb.colordb().find_byname(colorname)
        self.__sb.update_views(red, green, blue)