"""ListViewer class.

This class implements an input/output view on the color model.  It lists every
unique color (e.g. unique r/g/b value) found in the color database.  Each
color is shown by small swatch and primary color name.  Some colors have
aliases -- more than one name for the same r/g/b value.  These aliases are
displayed in the small listbox at the bottom of the screen.

Clicking on a color name or swatch selects that color and updates all other
windows.  When a color is selected in a different viewer, the color list is
scrolled to the selected color and it is highlighted.  If the selected color
is an r/g/b value without a name, no scrolling occurs.

You can turn off Update On Click if all you want to see is the alias for a
given name, without selecting the color.
"""

import sys
from Tkinter import *
from pynche import __version__
import ColorDB

class ListViewer:
    def __init__(self, switchboard, parent=None):
        self.__sb = switchboard
        self.__lastbox = None
        self.__dontcenter = 0
        root = self.__root = Toplevel(parent, class_='Pynche')
        root.protocol('WM_DELETE_WINDOW', self.__withdraw)
        root.title('Pynche %s' % __version__)
        root.iconname('Pynche Color List')
        root.bind('<Alt-q>', self.__quit)
        root.bind('<Alt-Q>', self.__quit)
        #
        # create the canvas which holds everything, and its scrollbar
        #
        frame = self.__frame = Frame(root)
        frame.pack()
        canvas = self.__canvas = Canvas(frame, width=160, height=300,
                                        borderwidth=2, relief=SUNKEN)
        self.__scrollbar = Scrollbar(frame)
        self.__scrollbar.pack(fill=Y, side=RIGHT)
        canvas.pack(fill=BOTH, expand=1)
        canvas.configure(yscrollcommand=(self.__scrollbar, 'set'))
        self.__scrollbar.configure(command=(canvas, 'yview'))
        #
        # create all the buttons
        colordb = switchboard.colordb()
        row = 0
        widest = 0
        bboxes = self.__bboxes = []
        for name in colordb.unique_names():
            exactcolor = ColorDB.triplet_to_rrggbb(colordb.find_byname(name))
            canvas.create_rectangle(5, row*20 + 5,
                                    20, row*20 + 20,
                                    fill=exactcolor)
            textid = canvas.create_text(25, row*20 + 13,
                                        text=name,
                                        anchor=W)
            x1, y1, textend, y2 = canvas.bbox(textid)
            boxid = canvas.create_rectangle(3, row*20+3,
                                            textend+3, row*20 + 23,
                                            outline='',
                                            tags=(exactcolor,))
            canvas.bind('<ButtonRelease>', self.__onrelease)
            bboxes.append(boxid)
            if textend+3 > widest:
                widest = textend+3
            row = row + 1
        canvheight = (row-1)*20 + 25
        canvas.config(scrollregion=(0, 0, 150, canvheight))
        for box in bboxes:
            x1, y1, x2, y2 = canvas.coords(box)
            canvas.coords(box, x1, y1, widest, y2)
        #
        # Update on click
        self.__uoc = BooleanVar()
        self.__uoc.set(1)
        self.__uocbtn = Checkbutton(root,
                                    text='Update on Click',
                                    variable=self.__uoc)
        self.__uocbtn.pack(expand=1, fill=BOTH)
        #
        # alias list
        self.__alabel = Label(root, text='Aliases:')
        self.__alabel.pack()
        self.__aliases = Listbox(root, height=5,
                                 selectmode=BROWSE)
        self.__aliases.pack(expand=1, fill=BOTH)

    def __onrelease(self, event=None):
        canvas = self.__canvas
        # find the current box
        x = canvas.canvasx(event.x)
        y = canvas.canvasy(event.y)
        ids = canvas.find_overlapping(x, y, x, y)
        for boxid in ids:
            if boxid in self.__bboxes:
                break
        else:
##            print 'No box found!'
            return
        tags = self.__canvas.gettags(boxid)
        for t in tags:
            if t[0] == '#':
                break
        else:
##            print 'No color tag found!'
            return
        red, green, blue = ColorDB.rrggbb_to_triplet(t)
        self.__dontcenter = 1
        if self.__uoc.get():
            self.__sb.update_views(red, green, blue)
        else:
            self.update_yourself(red, green, blue)

    def __quit(self, event=None):
        sys.exit(0)

    def __withdraw(self, event=None):
        self.__root.withdraw()

    def deiconify(self, event=None):
        self.__root.deiconify()

    def update_yourself(self, red, green, blue):
        canvas = self.__canvas
        # turn off the last box
        if self.__lastbox:
            canvas.itemconfigure(self.__lastbox, outline='')
        # turn on the current box
        colortag = ColorDB.triplet_to_rrggbb((red, green, blue))
        canvas.itemconfigure(colortag, outline='black')
        self.__lastbox = colortag
        # fill the aliases
        self.__aliases.delete(0, END)
        try:
            aliases = self.__sb.colordb().aliases_of(red, green, blue)[1:]
        except ColorDB.BadColor:
            self.__aliases.insert(END, '<no matching color>')
            return
        if not aliases:
            self.__aliases.insert(END, '<no aliases>')
        else:
            for name in aliases:
                self.__aliases.insert(END, name)
        # maybe scroll the canvas so that the item is visible
        if self.__dontcenter:
            self.__dontcenter = 0
        else:
            height = canvas['height']
            ig, ig, ig, y1 = canvas.coords(colortag)
            ig, ig, ig, y2 = canvas.coords(self.__bboxes[-1])
            h = int(canvas['height']) * 0.5
            canvas.yview('moveto', (y1-h) / y2)