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Directory : /usr/lib64/python2.7/site-packages/pynche/

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Current File : /usr/lib64/python2.7/site-packages/pynche/ChipViewer.py

"""Chip viewer and widget.

In the lower left corner of the main Pynche window, you will see two
ChipWidgets, one for the selected color and one for the nearest color.  The
selected color is the actual RGB value expressed as an X11 #COLOR name. The
nearest color is the named color from the X11 database that is closest to the
selected color in 3D space.  There may be other colors equally close, but the
nearest one is the first one found.

Clicking on the nearest color chip selects that named color.

The ChipViewer class includes the entire lower left quandrant; i.e. both the
selected and nearest ChipWidgets.
"""

from Tkinter import *
import ColorDB


class ChipWidget:
    _WIDTH = 150
    _HEIGHT = 80

    def __init__(self,
                 master = None,
                 width  = _WIDTH,
                 height = _HEIGHT,
                 text   = 'Color',
                 initialcolor = 'blue',
                 presscmd   = None,
                 releasecmd = None):
        # create the text label
        self.__label = Label(master, text=text)
        self.__label.grid(row=0, column=0)
        # create the color chip, implemented as a frame
        self.__chip = Frame(master, relief=RAISED, borderwidth=2,
                            width=width,
                            height=height,
                            background=initialcolor)
        self.__chip.grid(row=1, column=0)
        # create the color name
        self.__namevar = StringVar()
        self.__namevar.set(initialcolor)
        self.__name = Entry(master, textvariable=self.__namevar,
                            relief=FLAT, justify=CENTER, state=DISABLED,
                            font=self.__label['font'])
        self.__name.grid(row=2, column=0)
        # create the message area
        self.__msgvar = StringVar()
        self.__name = Entry(master, textvariable=self.__msgvar,
                            relief=FLAT, justify=CENTER, state=DISABLED,
                            font=self.__label['font'])
        self.__name.grid(row=3, 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)

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

    def set_name(self, colorname):
        self.__namevar.set(colorname)

    def set_message(self, message):
        self.__msgvar.set(message)

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

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



class ChipViewer:
    def __init__(self, switchboard, master=None):
        self.__sb = switchboard
        self.__frame = Frame(master, relief=RAISED, borderwidth=1)
        self.__frame.grid(row=3, column=0, ipadx=5, sticky='NSEW')
        # 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)

    def update_yourself(self, red, green, blue):
        # Selected always shows the #rrggbb name of the color, nearest always
        # shows the name of the nearest color in the database.  BAW: should
        # an exact match be indicated in some way?
        #
        # Always use the #rrggbb style to actually set the color, since we may
        # not be using X color names (e.g. "web-safe" names)
        colordb = self.__sb.colordb()
        rgbtuple = (red, green, blue)
        rrggbb = ColorDB.triplet_to_rrggbb(rgbtuple)
        # find the nearest
        nearest = colordb.nearest(red, green, blue)
        nearest_tuple = colordb.find_byname(nearest)
        nearest_rrggbb = ColorDB.triplet_to_rrggbb(nearest_tuple)
        self.__selected.set_color(rrggbb)
        self.__nearest.set_color(nearest_rrggbb)
        # set the name and messages areas
        self.__selected.set_name(rrggbb)
        if rrggbb == nearest_rrggbb:
            self.__selected.set_message(nearest)
        else:
            self.__selected.set_message('')
        self.__nearest.set_name(nearest_rrggbb)
        self.__nearest.set_message(nearest)

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

    def __buttonrelease(self, event=None):
        self.__nearest.release()
        rrggbb = self.__nearest.get_color()
        red, green, blue = ColorDB.rrggbb_to_triplet(rrggbb)
        self.__sb.update_views(red, green, blue)

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