# -*- coding: utf-8 -*-

import logging

from .container import Container

from .layout import VerticalLayout, HorizontalLayout

from .button import Button

class Pager(Container):

    '''Only one of children is visible at the time.'''

    def __init__(self, width=20, height=20):

        Container.__init__(self, width, height)

        # selected child (only one visible)

        self.selected = None

        vert = VerticalLayout()

        self.layout(vert)

        self.buttons = Container(20, 1)

        Container.add(self, self.buttons)

        horz = HorizontalLayout()

        self.buttons.layout(horz)

    def add(self, widget, **kw):

        Container.add(self, widget, **kw)

        if self.selected is None:

            self.selected = widget

            widget.hidden = False

        else:

            widget.hidden = True

        btn = Button(kw['title'])

        btn.connect('click', lambda: self.select(widget))

        self.buttons.add(btn)

    def select(self, child):

        log = logging.getLogger('tuikit')

        log.debug('Pager: select %r', child)

        self.selected.hidden = True

        child.hidden = False

        self.selected = child

        self.resize()