from tuikit.core.buffer import Buffer

from tuikit.core.signal import Signal

from tuikit.core.container import Container

class Window(Container):

    """Window is rectangular part of screen containing widgets.

    Widgets are drawn into window, events are routed to widgets through window.

    Parent of Window is always WindowManager.

    """

    def __init__(self, buffer=None):

        """New buffer for the window will be created unless given existing

        `buffer` as parameter."""

        Container.__init__(self)

        self._buffer = None

        self.buffer = buffer or Buffer()

    @property

    def buffer(self):

        return self._buffer

    @buffer.setter

    def buffer(self, buffer):

        # replace the buffer

        self._buffer = buffer

    @property

    def size(self):

        return self.buffer.size

    def resize(self, w, h):

        """Resize buffer when window gets resized."""

        Container.resize(self, w, h)

        self.buffer.resize(w, h)

        self.redraw()

    def redraw(self):

        self.buffer.reset_origin()

        Container.draw(self, self.buffer)

        self.buffer.puts('{0.w} {0.h}'.format(self.size), 10, 5)

        self.buffer.frame()

    def draw(self, buffer):

        """Draw this window into `buffer`."""

        self.redraw()

        buffer.draw(self.buffer)

class WindowManager(Container):

    def __init__(self, timer):

        Container.__init__(self)

        self.timer = timer

    def resize(self, w, h):

        self.children[0].resize(w, h)

    def handle_event(self, event_name, *args):

        """Handle input event to managed windows."""

        self._log.debug('Handle event: %s %r', event_name, args)

        handler = getattr(self, event_name, None)

        if handler:

            handler(*args)

        else:

            raise Exception('Unknown event: %r %r' % (event_name, args))