| """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) |
