path: root/number_box.py

# -*- coding: utf-8 -*-
# This code is from GNOME Sudoku
# Adapted by: Daniel Francis

from gi.repository import Gtk,Gdk,GObject,Pango,PangoCairo
import math
import random
import tracker_info
from gettext import gettext as _

# simple_debug
import logging
logger = logging.getLogger('number_box')
simple_debug = logger.debug

ERROR_HIGHLIGHT_COLOR = (1.0, 0, 0)

BASE_SIZE = 35 # The "normal" size of a box (in pixels)

# And the standard font-sizes -- these should fit nicely with the
# BASE_SIZE
BASE_FONT_SIZE = Pango.SCALE * 13
NOTE_FONT_SIZE = Pango.SCALE * 6

BORDER_WIDTH = 9.0 # The size of space we leave for a box
NORMAL_LINE_WIDTH = 1 # The size of the line we draw around a box

DEBUG_COLORS = False

def debug_set_color_rgba(cr, rgba):
    COLORS = ("red","green","blue","yellow","purple","wheat","maroon","gray")

    if DEBUG_COLORS:
        rgba = Gdk.RGBA()
        rgba.parse(COLORS[random.randint(0,len(COLORS)-1)])

    Gdk.cairo_set_source_rgba(cr, rgba)

class NumberSelector (Gtk.EventBox):

    __gsignals__ = {
        'changed':(GObject.SignalFlags.RUN_LAST, None, ()),
        }

    def __init__ (self, default = None, upper = 9):
        self.value = default
        GObject.GObject.__init__(self)
        self.table = Gtk.Table()
        self.add(self.table)
        side = int(math.sqrt(upper))
        n = 1
        for y in range(side):
            for x in range(side):
                b = Gtk.Button()
                l = Gtk.Label()
                if n == self.value:
                    l.set_markup('<b><span size="x-small">%s</span></b>'%n)
                else:
                    l.set_markup('<span size="x-small">%s</span>'%n)
                b.add(l)
                b.set_relief(Gtk.ReliefStyle.HALF)
                l = b.get_children()[0]
                b.set_border_width(0)
                l.set_padding(0, 0)
                l.get_alignment()
                b.connect('clicked', self.number_clicked, n)
                self.table.attach(b, x, x+1, y, y+1)
                n += 1
        if self.value:
            db = Gtk.Button()
            l = Gtk.Label()
            l.set_markup_with_mnemonic('<span size="x-small">'+_('_Clear')+'</span>')
            db.add(l)
            l.show()
            db.connect('clicked', self.number_clicked, 0)
            self.table.attach(db, 0, side, side + 1, side + 2)
        self.show_all()

    def number_clicked (self, button, n):
        self.value = n
        self.emit('changed')

    def get_value (self):
        return self.value

    def set_value (self, n):
        self.value = n

class NumberBox (Gtk.DrawingArea):

    text = ''
    top_note_text = ''
    bottom_note_text = ''
    read_only = False
    _layout = None
    _top_note_layout = None
    _bottom_note_layout = None
    text_color = None
    highlight_color = None
    shadow_color = None
    custom_background_color = None
    border_color = None

    __gsignals__ = {
        'value-about-to-change':(GObject.SignalFlags.RUN_LAST, None, ()),
        'notes-about-to-change':(GObject.SignalFlags.RUN_LAST, None, ()),
        'changed':(GObject.SignalFlags.RUN_LAST, None, ()),
        # undo-change - A hacky way to handle the fact that we want to
        # respond to undo's changes but we don't want undo to respond
        # to itself...
        'undo-change':(GObject.SignalFlags.RUN_LAST, None, ()),
        'notes-changed':(GObject.SignalFlags.RUN_LAST, None, ()),
        }

    base_state = Gtk.StateFlags.NORMAL
    npicker = None
    draw_boxes = False

    def __init__ (self, upper = 9, text = ''):
        Gtk.DrawingArea.__init__(self)
        self.upper = upper
        self.parent_win = None
        self.timer = None
        self.font = self.get_style().font_desc
        self.font.set_size(BASE_FONT_SIZE)
        self.note_font = self.font.copy()
        self.note_font.set_size(NOTE_FONT_SIZE)
        self._top_note_layout = Pango.Layout(self.create_pango_context())
        self._top_note_layout.set_font_description(self.note_font)
        self._bottom_note_layout = Pango.Layout(self.create_pango_context())
        self._bottom_note_layout.set_font_description(self.note_font)
        self._base_stateflags = Gtk.StateFlags.NORMAL
        self.top_note_list = []
        self.bottom_note_list = []
        self.tinfo = tracker_info.TrackerInfo()
        self.set_property('can-focus', True)
        self.set_property('events', Gdk.EventMask.ALL_EVENTS_MASK)
        self.connect('button-press-event', self.button_press_cb)
        self.connect('key-release-event', self.key_press_cb)
        self.connect('enter-notify-event', self.pointer_enter_cb)
        self.connect('leave-notify-event', self.pointer_leave_cb)
        self.connect('focus-in-event', self.focus_in_cb)
        self.connect('focus-out-event', self.focus_out_cb)
        self.connect('motion-notify-event', self.motion_notify_cb)
        self.set_text(text)

    def set_parent_win(self, new_parent):
        self.parent_win = new_parent

    def set_timer(self, new_timer):
        self.timer = new_timer

    def pointer_enter_cb (self, *args):
        if not self.is_focus():
            self.set_state_flags(Gtk.StateFlags.PRELIGHT, False)

    def pointer_leave_cb (self, *args):
        self.set_state_flags(self._base_stateflags, True)
        self._toggle_box_drawing_(False)

    def focus_in_cb (self, *args):
        self.set_state_flags(Gtk.StateFlags.SELECTED, True)
        self._base_stateflags = Gtk.StateFlags.SELECTED

    def focus_out_cb (self, *args):
        self.set_state_flags(Gtk.StateFlags.NORMAL, True)
        self._base_stateflags = Gtk.StateFlags.NORMAL
        self.destroy_npicker()

    def destroy_npicker (self):
        if self.npicker:
            self.npicker.destroy()
            self.npicker = None

    def motion_notify_cb (self, *args):
        if self.is_focus() and not self.read_only:
            self._toggle_box_drawing_(True)
        else:
            self._toggle_box_drawing_(False)

    def _toggle_box_drawing_ (self, val):
        if val and not self.draw_boxes:
            self.draw_boxes = True
            self.queue_draw()
        if (not val) and self.draw_boxes:
            self.draw_boxes = False
            self.queue_draw()

    def button_press_cb (self, w, e):
        if self.read_only:
            return
        if e.type == Gdk.EventType._2BUTTON_PRESS:
            # ignore second click (this makes a double click in the
            # middle of a cell get us a display of the numbers, rather
            # than selecting a number.
            return
        if self.is_focus():
            x, y = e.get_coords()
            alloc = self.get_allocation()
            my_w = alloc.width
            my_h = alloc.height
            border_height = float(BORDER_WIDTH)/BASE_SIZE

            if float(y)/my_h < border_height:
                self.show_note_editor(top = True)
            elif float(y)/my_h > (1-border_height):
                self.show_note_editor(top = False)
            elif not self.npicker:
                # In this case we're a normal old click...
                # makes sure there is only one numer selector
                self.show_number_picker()
        else:
            self.grab_focus()

    def key_press_cb (self, w, e):
        if self.read_only:
            return
        if self.npicker: # kill number picker no matter what is pressed
            self.destroy_npicker()
        txt = Gdk.keyval_name(e.keyval)
        if type(txt) == type(None):
            # Make sure we don't trigger on unplugging the A/C charger etc
            return
        txt = txt.replace('KP_', '')

        # Add the new value if need be
        if txt in [str(n) for n in range(1, self.upper+1)]:
            if e.state & Gdk.ModifierType.CONTROL_MASK:
                self.add_note_text(txt, top = True)
            elif e.state & Gdk.ModifierType.MOD1_MASK:
                self.remove_note_text(txt, top = True)
            elif self.get_text() != txt or \
                (self.tracker_id != tracker_info.NO_TRACKER and
                 self.tinfo.current_tracker == tracker_info.NO_TRACKER):
                # If there's no change, do nothing unless the player wants to
                # change a tracked item while not tracking(ie commit a tracked
                # change)
                self.set_text_interactive(txt)
        elif txt in ['0', 'Delete', 'BackSpace']:
            self.set_text_interactive('')
        elif txt in ['n', 'N']:
            if e.state & Gdk.ModifierType.MOD1_MASK:
                self.set_note_text_interactive(top_text = '')
            else:
                self.show_note_editor(top = True)
        elif txt in ['m', 'M']:
            if e.state & Gdk.ModifierType.MOD1_MASK:
                self.set_note_text_interactive(bottom_text = '')
            else:
                self.show_note_editor(top = False)

    def add_note_text(self, txt, top = False):
        if top:
            note = self.top_note_text
        else:
            note = self.bottom_note_text
        if txt not in note:
            tmp = list(note)
            tmp.append(txt)
            tmp.sort()
            note = ''.join(tmp)
            if top:
                self.set_note_text_interactive(top_text = note)
            else:
                self.set_note_text_interactive(bottom_text = note)

    def remove_note_text(self, txt, top = False):
        if top:
            note = self.top_note_text
        else:
            note = self.bottom_note_text
        if txt in note:
            note = note.replace(txt,'')
            if top:
                self.set_note_text_interactive(top_text = note)
            else:
                self.set_note_text_interactive(bottom_text = note)

    def note_changed_cb (self, w, top = False):
        if top:
            self.set_note_text_interactive(top_text = w.get_text())
        else:
            self.set_note_text_interactive(bottom_text = w.get_text())

    def note_focus_in(self, win, evt):
        if (self.timer):
            self.timer.resume_timing()

    def note_focus_out(self, wgt, evt):
        if (self.timer):
            self.timer.pause_timing()

    def show_note_editor (self, top = True):
        alloc = self.get_allocation()
        w = Gtk.Window()
        w.set_property('skip-pager-hint', True)
        w.set_property('skip-taskbar-hint', True)
        w.set_decorated(False)
        w.set_position(Gtk.WindowPosition.MOUSE)
        w.set_size_request(alloc.width, alloc.height/2)
        if self.parent_win:
            w.set_transient_for(self.parent_win)
        f = Gtk.Frame()
        e = Gtk.Entry()
        f.add(e)
        if top:
            e.set_text(self.top_note_text)
        else:
            e.set_text(self.bottom_note_text)
        w.add(f)
        e.connect('changed', self.note_changed_cb, top)
        e.connect('focus-in-event', self.note_focus_in)
        e.connect('focus-out-event', lambda e, ev, w: w.destroy(), w)
        e.connect('focus-out-event', self.note_focus_out)
        e.connect('activate', lambda e, w: w.destroy(), w)
        _, x, y = self.get_window().get_origin()
        if top:
            w.move(x, y)
        else:
            w.move(x, y+int(alloc.height*0.6))
        w.show_all()
        e.grab_focus()

    def number_changed_cb (self, num_selector):
        self.destroy_npicker()
        newval = num_selector.get_value()
        if newval:
            self.set_text_interactive(str(newval))
        else:
            self.set_text_interactive('')            

    def show_number_picker (self):
        w = Gtk.Window(type = Gtk.WindowType.POPUP)
        ns = NumberSelector(upper = self.upper, default = self.get_value())
        ns.connect('changed', self.number_changed_cb)
        w.grab_focus()
        w.add(ns)
        _, xorigin, yorigin = self.get_window().get_origin()
        x, y = (self.get_allocated_width(), self.get_allocated_height())
        popupx, popupy = w.get_size()
        overlapx = popupx-x
        overlapy = popupy-y
        w.move(xorigin - (overlapx/2), yorigin - (overlapy/2))
        w.show()
        self.npicker = w

    def set_text_interactive (self, text):
        self.emit('value-about-to-change')
        self.set_text(text)
        self.queue_draw()
        self.emit('changed')

    def set_font (self, font):
        if type(font) == str:
            font = Pango.FontDescription(font)
        self.font = font
        if self.text:
            self.set_text(self.text)
        self.queue_draw()

    def set_note_font (self, font):
        if type(font) == str:
            font = Pango.FontDescription(font)
        self.note_font = font
        self._top_note_layout.set_font_description(font)
        self._bottom_note_layout.set_font_description(font)
        self.queue_draw()

    def set_text (self, text):
        self.text = text
        self._layout = self.create_pango_layout(text)
        self._layout.set_font_description(self.font)

    def show_note_text (self):
        '''Display the notes for the current view
        '''
        self.top_note_text = self.get_note_display(self.top_note_list)[1]
        self._top_note_layout.set_markup(self.get_note_display(self.top_note_list)[2], -1)
        self.bottom_note_text = self.get_note_display(self.bottom_note_list)[1]
        self._bottom_note_layout.set_markup(self.get_note_display(self.bottom_note_list)[2], -1)
        self.queue_draw()

    def set_note_text (self, top_text = None, bottom_text = None, for_hint = False):
        '''Change the notes
        '''
        if top_text is not None:
            self.update_notelist(self.top_note_list, top_text)
        if bottom_text is not None:
            self.update_notelist(self.bottom_note_list, bottom_text, for_hint)
        self.show_note_text()

    def set_note_text_interactive (self, *args, **kwargs):
        self.emit('notes-about-to-change')
        self.set_note_text(*args, **kwargs)
        self.emit('notes-changed')

    def set_notelist(self, top_notelist, bottom_notelist):
        '''Assign new note lists
        '''
        if top_notelist:
            self.top_note_list = top_notelist
        if bottom_notelist:
            self.bottom_note_list = bottom_notelist

    def get_note_display(self, notelist, tracker_id = None, include_untracked = True):
        '''Parse a notelist for display

        Parse a notelist for the display.
        notelist - This method works on one notelist at a time, so
            top_note_list or bottom_note_list must be passed in.
        tracker_id - can specify a particular tracker.  The default is to use
            tracker that is currently showing.
        include_untracked - When set to True(default), the untracked notes will
            be included in the output.  Set it to false to exclude untracked
            notes.

        The output is returned in 3 formats:
        display_list - is tuple list in the format (notelist_index, tid, note)
            notelist_index - the index within the notelist
            tid - tracker id
            note - value of the note
        display_text - vanilla string representing all the values
        markup_text - pango markup string that colors each note for its tracker
        '''
        display_list = []
        display_text = ''
        markup_text = ''
        if tracker_id == None:
            tracker_id = self.tinfo.showing_tracker
        if include_untracked:
            track_filter = [tracker_info.NO_TRACKER, tracker_id]
        else:
            track_filter = [tracker_id]
        last_tracker = tracker_info.NO_TRACKER
        for notelist_index, (tid, note) in enumerate(notelist[:]):
            if tid not in track_filter:
                continue
            display_list.append((notelist_index, tid, note))
            display_text += note
            if tid != last_tracker:
                if self.tinfo.get_color_markup(last_tracker):
                    markup_text += '</span>'
                if self.tinfo.get_color_markup(tid):
                    markup_text += '<span foreground="' + str(self.tinfo.get_color_markup(tid)) + '">'
                last_tracker = tid
            markup_text += note
        if self.tinfo.get_color_markup(last_tracker):
            markup_text += '</span>'
        return((display_list, display_text, markup_text))

    def update_notelist(self, notelist, new_notes, for_hint = False):
        '''Parse notes for a notelist

        A notelist stores individual notes in the format (tracker, note).  The
        sequence is also meaningful - it dictates the order in which the notes
        are displayed.  One notelist is maintained for the top
        notes(top_note_list), and one for the bottom(bottom_note_list).  This
        method is responsible for maintaining those lists.

        When updating for hints(for_hint == True), the old notes are replaced
        completely by the new notes and set with NO_TRACKER.
        '''
        # Remove any duplicates
        unique_notes = ""
        for note in new_notes:
            if note not in unique_notes:
                unique_notes += note
        # Create a list and text version of the notelist
        display_list = self.get_note_display(notelist)[0]
        display_text = self.get_note_display(notelist)[1]
        if display_text == unique_notes:
            return
        # Remove deleted values from the notelist
        del_offset = 0
        for display_index, (notelist_index, tid, old_note) in enumerate(display_list[:]):
            if old_note not in unique_notes or for_hint:
                del notelist[notelist_index + del_offset]
                del display_list[display_index + del_offset]
                del_offset -= 1
            else:
                # Adjust the display_list index
                display_list[display_index + del_offset] = (notelist_index + del_offset, tid, old_note)
        # Insert any new values into the notelist
        ins_offset = 0
        display_index = 0
        for new_index, new_note in enumerate(unique_notes):
            add_note = False
            # if the new notes are longer than the current ones - append
            if len(display_list) <= display_index:
                notelist_index = len(notelist)
                ins_offset = 0
                add_note = True
            # Otherwise - advance until we find the appropriate place to insert
            else:
                old_note = display_list[display_index][2]
                if new_note != old_note:
                    notelist_index = display_list[display_index][0]
                    add_note = True
                display_index += 1
            if add_note:
                if for_hint:
                    use_tracker = tracker_info.NO_TRACKER
                else:
                    use_tracker = self.tinfo.current_tracker
                notelist.insert(notelist_index + ins_offset, (use_tracker, new_note))
                display_list.insert(new_index, (notelist_index + ins_offset, self.tinfo.current_tracker, new_note))
                ins_offset = ins_offset + 1
        self.trim_untracked_notes(notelist)

    def trim_untracked_notes(self, notelist):
        untracked_text = self.get_note_display(notelist, tracker_info.NO_TRACKER)[1]
        for tid, note in notelist[:]:
            if note in untracked_text and tid != tracker_info.NO_TRACKER:
                notelist.remove((tid, note))

    def get_notes_for_undo(self):
        '''Return the top and bottom notelists
        '''
        return((self.top_note_list[:], self.bottom_note_list[:]))

    def set_notes_for_undo(self, notelists):
        '''Reset the top and bottom notelists from an undo
        '''
        self.top_note_list, self.bottom_note_list = notelists
        self.show_note_text()

    @simple_debug
    def do_draw(self, cr):

        w = self.get_allocated_width()
        h = self.get_allocated_height()
        style_ctx = self.get_style_context()

        self.draw_background_color(cr, style_ctx, w, h)
        if self.is_focus():
            self.draw_highlight_box(cr, style_ctx, w, h)
        if self.border_color is not None:
            border_width = 3.0
            cr.set_source_rgb(*self.border_color)
            cr.rectangle(border_width*0.5, border_width*0.5, w-border_width, h-border_width)
            cr.set_line_width(border_width)
            cr.stroke()

        if h < w:
            scale = h/float(BASE_SIZE)
        else:
            scale = w/float(BASE_SIZE)
        cr.scale(scale, scale)

        self.draw_text(cr, style_ctx)
        if self.draw_boxes and self.is_focus():
            self.draw_note_area_highlight_box(cr, style_ctx)

    def draw_background_color (self, cr, style_ctx, w, h):
        if self.read_only:
            if self.custom_background_color:
                r, g, b = self.custom_background_color
                cr.set_source_rgb(
                    r*0.6, g*0.6, b*0.6
                    )
            else:
                #cr.set_source_color(self.style.base[Gtk.StateFlags.INSENSITIVE])
                #Gdk.cairo_set_source_rgba(
                debug_set_color_rgba(
                        cr, style_ctx.get_color(Gtk.StateFlags.INSENSITIVE))
        elif self.is_focus():
            #cr.set_source_color(self.style.base[Gtk.StateFlags.SELECTED])
            #Gdk.cairo_set_source_rgba(
            debug_set_color_rgba(
                    cr, style_ctx.get_color(Gtk.StateFlags.SELECTED))
        elif self.custom_background_color:
            cr.set_source_rgb(*self.custom_background_color)
        else:
            #cr.set_source_color(
            #    self.style.base[self.state]
            #    )
            #Gdk.cairo_set_source_rgba(
            cr.set_source_rgb(1.0, 1.0, 1.0)
        cr.rectangle(
            0, 0, w, h,
            )
        cr.fill()

    def draw_highlight_box (self, cr, style_ctx, w, h):
        #cr.set_source_color(
        #    self.style.base[Gtk.StateFlags.SELECTED]
        #    )
        #Gdk.cairo_set_source_rgba(
        debug_set_color_rgba(
                    cr, style_ctx.get_background_color(Gtk.StateFlags.SELECTED))

        border = 4 * w / BASE_SIZE
        cr.rectangle(
            # left-top
            border*0.5,
            border*0.5,
            # bottom-right
            w-border,
            h-border,
            )
        cr.set_line_width(border)
        cr.stroke()

    def draw_note_area_highlight_box (self, cr, style_ctx):
        # set up our paint brush...
        #cr.set_source_color(
        #    self.style.mid[self.state]
        #    )
        #Gdk.cairo_set_source_rgba(
        debug_set_color_rgba(
                cr, style_ctx.get_border_color(self.get_state_flags()))

        cr.set_line_width(NORMAL_LINE_WIDTH)
        # top rectangle
        cr.rectangle(NORMAL_LINE_WIDTH*0.5,
                     NORMAL_LINE_WIDTH*0.5,
                     BASE_SIZE-NORMAL_LINE_WIDTH,
                     BORDER_WIDTH-NORMAL_LINE_WIDTH)
        cr.stroke()
        # bottom rectangle
        cr.rectangle(NORMAL_LINE_WIDTH*0.5, #x
                     BASE_SIZE - BORDER_WIDTH-(NORMAL_LINE_WIDTH*0.5), #y
                     BASE_SIZE-NORMAL_LINE_WIDTH, #x2
                     BASE_SIZE-NORMAL_LINE_WIDTH #y2
                     )
        cr.stroke()

    def draw_text (self, cr, style_ctx):
        fontw, fonth = self._layout.get_pixel_size()
        # Draw a shadow for tracked conflicts.  This is done to
        # differentiate between tracked and untracked conflicts.
        if self.shadow_color:
            cr.set_source_rgb(*self.shadow_color)
            for xoff, yoff in [(1,1),(2,2)]:
                cr.move_to((BASE_SIZE/2)-(fontw/2) + xoff, (BASE_SIZE/2) - (fonth/2) + yoff)
                PangoCairo.show_layout(cr, self._layout)
        if self.text_color:
            cr.set_source_rgb(*self.text_color)
        elif self.read_only:
            #cr.set_source_color(self.style.text[Gtk.StateFlags.NORMAL])
            #Gdk.cairo_set_source_rgba(
            debug_set_color_rgba(
                cr, style_ctx.get_color(Gtk.StateFlags.NORMAL))
        else:
            #cr.set_source_color(self.style.text[self.state])
            #Gdk.cairo_set_source_rgba(
            debug_set_color_rgba(
                cr, style_ctx.get_color(Gtk.StateFlags.NORMAL))

        # And draw the text in the middle of the allocated space
        if self._layout:
            cr.move_to(
                (BASE_SIZE/2)-(fontw/2),
                (BASE_SIZE/2) - (fonth/2),
                )
            PangoCairo.update_layout(cr, self._layout)
            PangoCairo.show_layout(cr, self._layout)

        #cr.set_source_color(self.style.text[self.state])
        #Gdk.cairo_set_source_rgba(
        debug_set_color_rgba(
            cr, style_ctx.get_color(Gtk.StateFlags.NORMAL))

        # And draw any note text...
        if self._top_note_layout:
            fontw, fonth = self._top_note_layout.get_pixel_size()
            cr.move_to(
                NORMAL_LINE_WIDTH,
                0,
                )
            PangoCairo.update_layout(cr, self._top_note_layout)
            PangoCairo.show_layout(cr, self._top_note_layout)
        if self._bottom_note_layout:
            fontw, fonth = self._bottom_note_layout.get_pixel_size()
            cr.move_to(
                NORMAL_LINE_WIDTH,
                BASE_SIZE-fonth,
                )
            PangoCairo.update_layout(cr, self._bottom_note_layout)
            PangoCairo.show_layout(cr, self._bottom_note_layout)

    def set_text_color (self, color, shadow = None):
        self.shadow_color = shadow
        self.text_color = color
        self.queue_draw()

    def set_background_color (self, color):
        self.custom_background_color = color
        self.queue_draw()

    def set_border_color (self, color):
        self.border_color = color
        self.queue_draw()

    def hide_notes (self):
        pass

    def show_notes (self):
        pass

    def set_value (self, v):
        if 0 < v <= self.upper:
            self.set_text(str(v))
        else:
            self.set_text('')
        self.queue_draw()

    def get_value (self):
        try:
            return int(self.text)
        except:
            return None

    def get_text (self):
        return self.text

    def get_note_text (self):
        return self.top_note_text, self.bottom_note_text

class SudokuNumberBox (NumberBox):

    normal_color = None
    tracker_id = None
    error_color = (1.0, 0, 0)
    highlight_color = ERROR_HIGHLIGHT_COLOR

    def set_value(self, val, tracker_id = None):
        if tracker_id == None:
            self.tracker_id = self.tinfo.current_tracker
        else:
            self.tracker_id = tracker_id
        self.normal_color = self.tinfo.get_color(self.tracker_id)
        self.set_text_color(self.normal_color)
        super(SudokuNumberBox, self).set_value(val)

    def get_value_for_undo(self):
        return(self.tracker_id, self.get_value(), self.tinfo.get_trackers_for_cell(self.x, self.y))

    def set_value_for_undo (self, undo_val):
        tracker_id, value, all_traces = undo_val
        # When undo sets a value, switch to that tracker
        if value:
            self.tinfo.ui.select_tracker(tracker_id)
        self.set_value(value, tracker_id)
        self.tinfo.reset_trackers_for_cell(self.x, self.y, all_traces)
        self.emit('undo_change')

    def recolor(self, tracker_id):
        self.normal_color = self.tinfo.get_color(tracker_id)
        self.set_text_color(self.normal_color)

    def set_error_highlight (self, val):
        if val:
            if (self.tracker_id != tracker_info.NO_TRACKER):
                self.set_text_color(self.error_color, self.normal_color)
            else:
                self.set_text_color(self.error_color)
        else:
            self.set_text_color(self.normal_color)

    def set_read_only (self, val):
        self.read_only = val
        if not hasattr(self, 'bold_font'):
            self.normal_font = self.font
            self.bold_font = self.font.copy()
            self.bold_font.set_weight(Pango.Weight.BOLD)
        if self.read_only:
            self.set_font(self.bold_font)
        else:
            self.set_font(self.normal_font)
        self.queue_draw()

    def set_impossible (self, val):
        if val:
            if not self.get_text():
                self.set_text('X')
                self.set_text_color(self.error_color)
        elif self.get_text() == 'X':
            self.set_text('')
            self.set_text_color(self.normal_color)
        self.queue_draw()


GObject.type_register(NumberBox)

if __name__ == '__main__':
    window = Gtk.Window()
    window.connect('delete-event', Gtk.main_quit)

    def test_number_selector ():
        nselector = NumberSelector(default = 3)
        def tell_me (b):
            print 'value->', b.get_value()
        nselector.connect('changed', tell_me)
        window.add(nselector)

    def test_number_box ():
        window.set_size_request(100, 100)
        nbox = NumberBox()
        window.add(nbox)

#    test_number_selector()
    test_number_box()
    window.show_all()
    Gtk.main()