ui.py

#!/usr/bin/python -u
# -*- coding: utf-8 -*-
#
# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.


# DESCRIPTION :
#
# This library provides convenience routines to launch factory tests.
# This includes support for drawing the test widget in a window at the
# proper location, grabbing control of the mouse, and making the mouse
# cursor disappear.
#
# This UI is intended to be used by the factory autotest suite to
# provide factory operators feedback on test status and control over
# execution order.
#
# In short, the UI is composed of a 'console' panel on the bottom of
# the screen which displays the autotest log, and there is also a
# 'test list' panel on the right hand side of the screen.  The
# majority of the screen is dedicated to tests, which are executed in
# seperate processes, but instructed to display their own UIs in this
# dedicated area whenever possible.  Tests in the test list are
# executed in order by default, but can be activated on demand via
# associated keyboard shortcuts.  As tests are run, their status is
# color-indicated to the operator -- greyed out means untested, yellow
# means active, green passed and red failed.

import logging
import os
import re
import string
import subprocess
import sys
from itertools import izip, product
from optparse import OptionParser

# GTK and X modules
import gobject
import gtk
import pango

# Guard loading Xlib because it is currently not available in the
# image build process host-depends list.  Failure to load in
# production should always manifest during regular use.
try:
    from Xlib import X
    from Xlib.display import Display
except:
    pass

# Factory and autotest modules
import factory_common
from autotest_lib.client.cros import factory
from autotest_lib.client.cros.factory import TestState
from autotest_lib.client.cros.factory.event import Event, EventClient


# For compatibility with tests before TestState existed
ACTIVE = TestState.ACTIVE
PASSED = TestState.PASSED
FAILED = TestState.FAILED
UNTESTED = TestState.UNTESTED

# Color definition
BLACK = gtk.gdk.Color()
RED =   gtk.gdk.Color(0xFFFF, 0, 0)
GREEN = gtk.gdk.Color(0, 0xFFFF, 0)
BLUE =  gtk.gdk.Color(0, 0, 0xFFFF)
WHITE = gtk.gdk.Color(0xFFFF, 0xFFFF, 0xFFFF)
LIGHT_GREEN = gtk.gdk.color_parse('light green')
SEP_COLOR = gtk.gdk.color_parse('grey50')

RGBA_GREEN_OVERLAY = (0, 0.5, 0, 0.6)
RGBA_YELLOW_OVERLAY = (0.6, 0.6, 0, 0.6)

LABEL_COLORS = {
    TestState.ACTIVE: gtk.gdk.color_parse('light goldenrod'),
    TestState.PASSED: gtk.gdk.color_parse('pale green'),
    TestState.FAILED: gtk.gdk.color_parse('tomato'),
    TestState.UNTESTED: gtk.gdk.color_parse('dark slate grey')}

LABEL_FONT = pango.FontDescription('courier new condensed 16')
LABEL_LARGE_FONT = pango.FontDescription('courier new condensed 24')

FAIL_TIMEOUT = 30

USER_PASS_FAIL_SELECT_STR = (
    'hit TAB to fail and ENTER to pass\n' +
    '錯誤請按 TAB，成功請按 ENTER')
# Resolution where original UI is designed for.
_UI_SCREEN_WIDTH = 1280
_UI_SCREEN_HEIGHT = 800

_LABEL_STATUS_ROW_SIZE = (300, 30)
_LABEL_EN_SIZE = (170, 35)
_LABEL_ZH_SIZE = (70, 35)
_LABEL_EN_FONT = pango.FontDescription('courier new extra-condensed 16')
_LABEL_ZH_FONT = pango.FontDescription('normal 12')
_LABEL_T_SIZE = (40, 35)
_LABEL_T_FONT = pango.FontDescription('arial ultra-condensed 10')
_LABEL_UNTESTED_FG = gtk.gdk.color_parse('grey40')
_LABEL_TROUGH_COLOR = gtk.gdk.color_parse('grey20')
_LABEL_STATUS_SIZE = (140, 30)
_LABEL_STATUS_FONT = pango.FontDescription(
    'courier new bold extra-condensed 16')
_OTHER_LABEL_FONT = pango.FontDescription('courier new condensed 20')

_ST_LABEL_EN_SIZE = (250, 35)
_ST_LABEL_ZH_SIZE = (150, 35)

_NO_ACTIVE_TEST_DELAY_MS = 500


# ---------------------------------------------------------------------------
# Client Library


# TODO(hungte) Replace gtk_lock by gtk.gdk.lock when it's availble (need pygtk
# 2.2x, and we're now pinned by 2.1x)
class _GtkLock(object):
    __enter__ = gtk.gdk.threads_enter
    def __exit__(*ignored):
        gtk.gdk.threads_leave()


gtk_lock = _GtkLock()


def make_label(message, font=LABEL_FONT, fg=LIGHT_GREEN,
               size=None, alignment=None):
    """Returns a label widget.

    A wrapper for gtk.Label. The unit of size is pixels under resolution
    _UI_SCREEN_WIDTH*_UI_SCREEN_HEIGHT.

    @param message: A string to be displayed.
    @param font: Font descriptor for the label.
    @param fg: Foreground color.
    @param size: Minimum size for this label.
    @param alignment: Alignment setting.
    @return: A label widget.
    """
    l = gtk.Label(message)
    l.modify_font(font)
    l.modify_fg(gtk.STATE_NORMAL, fg)
    if size:
        # Convert size according to the current resolution.
        l.set_size_request(*convert_pixels(size))
    if alignment:
        l.set_alignment(*alignment)
    return l


def make_status_row(init_prompt,
                    init_status,
                    label_size=_LABEL_STATUS_ROW_SIZE):
    """Returns a widget that live updates prompt and status in a row.

    Args:
        init_prompt: The prompt label text.
        init_status: The status label text.
        label_size: The desired size of the prompt label and the status label.

    Returns:
        1) A dict whose content is linked by the widget.
        2) A widget to render dict content in "prompt:   status" format.
    """
    display_dict = {}
    display_dict['prompt'] = init_prompt
    display_dict['status'] = init_status

    def prompt_label_expose(widget, event):
        prompt = display_dict['prompt']
        widget.set_text(prompt)

    def status_label_expose(widget, event):
        status = display_dict['status']
        widget.set_text(status)
        widget.modify_fg(gtk.STATE_NORMAL, LABEL_COLORS[status])

    prompt_label = make_label(
            init_prompt, size=label_size,
            alignment=(0, 0.5))
    delimiter_label = make_label(':', alignment=(0, 0.5))
    status_label = make_label(
            init_status, size=label_size,
            alignment=(0, 0.5), fg=LABEL_COLORS[init_status])

    widget = gtk.HBox()
    widget.pack_end(status_label, False, False)
    widget.pack_end(delimiter_label, False, False)
    widget.pack_end(prompt_label, False, False)

    status_label.connect('expose_event', status_label_expose)
    prompt_label.connect('expose_event', prompt_label_expose)
    return display_dict, widget


def convert_pixels(size):
    """Converts a pair in pixel that is suitable for current resolution.

    GTK takes pixels as its unit in many function calls. To maintain the
    consistency of the UI in different resolution, a conversion is required.
    Take current resolution and (_UI_SCREEN_WIDTH, _UI_SCREEN_HEIGHT) as
    the original resolution, this function returns a pair of width and height
    that is converted for current resolution.

    Because pixels in negative usually indicates unspecified, no conversion
    will be done for negative pixels.

    In addition, the aspect ratio is not maintained in this function.

    Usage Example:
        width,_ = convert_pixels((20,-1))

    @param size: A pair of pixels that designed under original resolution.
    @return: A pair of pixels of (width, height) format.
             Pixels returned are always integer.
    """
    return (int(float(size[0]) / _UI_SCREEN_WIDTH * gtk.gdk.screen_width()
           if (size[0] > 0) else size[0]),
           int(float(size[1]) / _UI_SCREEN_HEIGHT * gtk.gdk.screen_height()
           if (size[1] > 0) else size[1]))


def make_hsep(height=1):
    """Returns a widget acts as a horizontal separation line.

    The unit is pixels under resolution _UI_SCREEN_WIDTH*_UI_SCREEN_HEIGHT.
    """
    frame = gtk.EventBox()
    # Convert height according to the current resolution.
    frame.set_size_request(*convert_pixels((-1, height)))
    frame.modify_bg(gtk.STATE_NORMAL, SEP_COLOR)
    return frame


def make_vsep(width=1):
    """Returns a widget acts as a vertical separation line.

    The unit is pixels under resolution _UI_SCREEN_WIDTH*_UI_SCREEN_HEIGHT.
    """
    frame = gtk.EventBox()
    # Convert width according to the current resolution.
    frame.set_size_request(*convert_pixels((width, -1)))
    frame.modify_bg(gtk.STATE_NORMAL, SEP_COLOR)
    return frame


def make_countdown_widget(prompt=None, value=None, fg=LIGHT_GREEN):
    if prompt is None:
        prompt = 'time remaining / 剩餘時間: '
    if value is None:
        value = '%s' % FAIL_TIMEOUT
    title = make_label(prompt, fg=fg, alignment=(1, 0.5))
    countdown = make_label(value, fg=fg, alignment=(0, 0.5))
    hbox = gtk.HBox()
    hbox.pack_start(title)
    hbox.pack_start(countdown)
    eb = gtk.EventBox()
    eb.modify_bg(gtk.STATE_NORMAL, BLACK)
    eb.add(hbox)
    return eb, countdown


def hide_cursor(gdk_window):
    pixmap = gtk.gdk.Pixmap(None, 1, 1, 1)
    color = gtk.gdk.Color()
    cursor = gtk.gdk.Cursor(pixmap, pixmap, color, color, 0, 0)
    gdk_window.set_cursor(cursor)


def calc_scale(wanted_x, wanted_y):
    (widget_size_x, widget_size_y) = factory.get_shared_data('test_widget_size')
    scale_x = (0.9 * widget_size_x) / wanted_x
    scale_y = (0.9 * widget_size_y) / wanted_y
    scale = scale_y if scale_y < scale_x else scale_x
    scale = 1 if scale > 1 else scale
    factory.log('scale: %s' % scale)
    return scale


def trim(text, length):
    if len(text) > length:
        text = text[:length-3] + '...'
    return text


class InputError(ValueError):
    """Execption for input window callbacks to change status text message."""
    pass


def make_input_window(prompt=None,
                      init_value=None,
                      msg_invalid=None,
                      font=None,
                      on_validate=None,
                      on_keypress=None,
                      on_complete=None):
    """Creates a widget to prompt user for a valid string.

    @param prompt: A string to be displayed. None for default message.
    @param init_value: Initial value to be set.
    @param msg_invalid: Status string to display when input is invalid. None for
        default message.
    @param font: Font specification (string or pango.FontDescription) for label
        and entry. None for default large font.
    @param on_validate: A callback function to validate if the input from user
        is valid. None for allowing any non-empty input. Any ValueError or
        ui.InputError raised during execution in on_validate will be displayed
        in bottom status.
    @param on_keypress: A callback function when each keystroke is hit.
    @param on_complete: A callback function when a valid string is passed.
        None to stop (gtk.main_quit).
    @return: A widget with prompt, input entry, and status label.
             In addition, a method called get_entry() is added to the widget to
             provide controls on the entry.
    """
    DEFAULT_MSG_INVALID = "Invalid input / 輸入不正確"
    DEFAULT_PROMPT = "Enter Data / 輸入資料:"

    def enter_callback(entry):
        text = entry.get_text()
        try:
            if (on_validate and (not on_validate(text))) or (not text.strip()):
                raise ValueError(msg_invalid)
            on_complete(text) if on_complete else gtk.main_quit()
        except ValueError as e:
            gtk.gdk.beep()
            status_label.set_text('ERROR: %s' % e.message)
        return True

    def key_press_callback(entry, key):
        status_label.set_text('')
        if on_keypress:
            return on_keypress(entry, key)
        return False

    # Populate default parameters
    if msg_invalid is None:
        msg_invalid = DEFAULT_MSG_INVALID

    if prompt is None:
        prompt = DEFAULT_PROMPT

    if font is None:
        font = LABEL_LARGE_FONT
    elif not isinstance(font, pango.FontDescription):
        font = pango.FontDescription(font)

    widget = gtk.VBox()
    label = make_label(prompt, font=font)
    status_label = make_label('', font=font)
    entry = gtk.Entry()
    entry.modify_font(font)
    entry.connect("activate", enter_callback)
    entry.connect("key_press_event", key_press_callback)
    if init_value:
        entry.set_text(init_value)
    widget.modify_bg(gtk.STATE_NORMAL, BLACK)
    status_label.modify_fg(gtk.STATE_NORMAL, RED)
    widget.add(label)
    widget.pack_start(entry)
    widget.pack_start(status_label)

    # Method for getting the entry.
    widget.get_entry = lambda : entry
    return widget


def make_summary_box(tests, state_map, rows=15):
    '''Creates a widget display status of a set of test.

    @param tests: A list of FactoryTest nodes whose status (and children's
        status) should be displayed.
    @param state_map: The state map as provide by the state instance.
    @param rows: The number of rows to display.
    @return: A tuple (widget, label_map), where widget is the widget, and
        label_map is a map from each test to the corresponding label.
    '''
    LABEL_EN_SIZE = (170, 35)
    LABEL_EN_SIZE_2 = (450, 25)
    LABEL_EN_FONT = pango.FontDescription('courier new extra-condensed 16')

    all_tests = sum([list(t.walk(in_order=True)) for t in tests], [])
    columns = len(all_tests) / rows + (len(all_tests) % rows != 0)

    info_box = gtk.HBox()
    info_box.set_spacing(20)
    for status in (TestState.ACTIVE, TestState.PASSED,
                   TestState.FAILED, TestState.UNTESTED):
        label = make_label(status,
                               size=LABEL_EN_SIZE,
                               font=LABEL_EN_FONT,
                               alignment=(0.5, 0.5),
                               fg=LABEL_COLORS[status])
        info_box.pack_start(label, False, False)

    vbox = gtk.VBox()
    vbox.set_spacing(20)
    vbox.pack_start(info_box, False, False)

    label_map = {}

    if all_tests:
        status_table = gtk.Table(rows, columns, True)
        for (j, i), t in izip(product(xrange(columns), xrange(rows)),
                              all_tests):
            msg_en = '  ' * (t.depth() - 1) + t.label_en
            msg_en = trim(msg_en, 12)
            if t.label_zh:
                msg = '{0:<12} ({1})'.format(msg_en, t.label_zh)
            else:
                msg = msg_en
            status = state_map[t].status
            status_label = make_label(msg,
                                      size=LABEL_EN_SIZE_2,
                                      font=LABEL_EN_FONT,
                                      alignment=(0.0, 0.5),
                                      fg=LABEL_COLORS[status])
            label_map[t] = status_label
            status_table.attach(status_label, j, j+1, i, i+1)
        vbox.pack_start(status_table, False, False)

    return vbox, label_map


def run_test_widget(dummy_job, test_widget,
                    invisible_cursor=True,
                    window_registration_callback=None,
                    cleanup_callback=None):
    test_widget_size = factory.get_shared_data('test_widget_size')

    window = gtk.Window(gtk.WINDOW_TOPLEVEL)
    window.modify_bg(gtk.STATE_NORMAL, BLACK)
    window.set_size_request(*test_widget_size)

    def show_window():
        window.show()
        window.window.raise_()  # pylint: disable=E1101
        gtk.gdk.pointer_grab(window.window, confine_to=window.window)
        if invisible_cursor:
            hide_cursor(window.window)

    test_path = factory.get_current_test_path()

    def handle_event(event):
        if (event.type == Event.Type.STATE_CHANGE and
            test_path and event.path == test_path and
            event.state.visible):
            show_window()

    event_client = EventClient(
            callback=handle_event, event_loop=EventClient.EVENT_LOOP_GOBJECT_IO)

    align = gtk.Alignment(xalign=0.5, yalign=0.5)
    align.add(test_widget)

    window.add(align)
    for c in window.get_children():
        # Show all children, but not the window itself yet.
        c.show_all()

    if window_registration_callback is not None:
        window_registration_callback(window)

    # Show the window if it is the visible test, or if the test_path is not
    # available (e.g., run directly from the command line).
    if (not test_path) or (
        TestState.from_dict_or_object(
            factory.get_state_instance().get_test_state(test_path)).visible):
        show_window()
    else:
        window.hide()

    gtk.main()

    gtk.gdk.pointer_ungrab()

    if cleanup_callback is not None:
        cleanup_callback()

    del event_client


# ---------------------------------------------------------------------------
# Server Implementation


class Console(object):
    '''Display a progress log.  Implemented by launching an borderless
    xterm at a strategic location, and running tail against the log.'''

    def __init__(self, allocation):
        # Specify how many lines and characters per line are displayed.
        XTERM_DISPLAY_LINES = 13
        XTERM_DISPLAY_CHARS = 120
        # Extra space reserved for pixels between lines.
        XTERM_RESERVED_LINES = 3

        xterm_coords = '%dx%d+%d+%d' % (XTERM_DISPLAY_CHARS,
                                        XTERM_DISPLAY_LINES,
                                        allocation.x,
                                        allocation.y)
        xterm_reserved_height = gtk.gdk.screen_height() - allocation.y
        font_size = int(float(xterm_reserved_height) / (XTERM_DISPLAY_LINES +
                                                        XTERM_RESERVED_LINES))
        logging.info('xterm_reserved_height = %d' % xterm_reserved_height)
        logging.info('font_size = %d' % font_size)
        logging.info('xterm_coords = %s', xterm_coords)
        xterm_opts = ('-bg black -fg lightgray -bw 0 -g %s' % xterm_coords)
        xterm_cmd = (
            ['urxvt'] + xterm_opts.split() +
            ['-fn', 'xft:DejaVu Sans Mono:pixelsize=%s' % font_size] +
            ['-e', 'bash'] +
            ['-c', 'tail -f "%s"' % factory.CONSOLE_LOG_PATH])
        logging.info('xterm_cmd = %s', xterm_cmd)
        self._proc = subprocess.Popen(xterm_cmd)

    def __del__(self):
        logging.info('console_proc __del__')
        self._proc.kill()


class TestLabelBox(gtk.EventBox):  # pylint: disable=R0904

    def __init__(self, test):
        gtk.EventBox.__init__(self)
        self.modify_bg(gtk.STATE_NORMAL, LABEL_COLORS[TestState.UNTESTED])
        depth = len(test.get_ancestor_groups())
        label_en_text = ' ' + ('..' * depth) + test.label_en
        self._label_en = make_label(
            label_en_text, size=_LABEL_EN_SIZE,
            font=_LABEL_EN_FONT, alignment=(0, 0.5),
            fg=_LABEL_UNTESTED_FG)
        self._label_zh = make_label(
            test.label_zh, size=_LABEL_ZH_SIZE,
            font=_LABEL_ZH_FONT, alignment=(0.5, 0.5),
            fg=_LABEL_UNTESTED_FG)
        self._label_t = make_label(
            '', size=_LABEL_T_SIZE, font=_LABEL_T_FONT,
            alignment=(0.5, 0.5), fg=BLACK)
        hbox = gtk.HBox()
        hbox.pack_start(self._label_en, False, False)
        hbox.pack_start(self._label_zh, False, False)
        hbox.pack_start(self._label_t, False, False)
        vbox = gtk.VBox()
        vbox.pack_start(hbox, False, False)
        vbox.pack_start(make_hsep(), False, False)
        self.add(vbox)
        self._status = None

    def set_shortcut(self, shortcut):
        if shortcut is None:
            return
        self._label_t.set_text('C-%s' % shortcut)
        attrs = self._label_en.get_attributes() or pango.AttrList()
        attrs.filter(lambda attr: attr.type == pango.ATTR_UNDERLINE)
        index_hotkey = self._label_en.get_text().upper().find(shortcut.upper())
        if index_hotkey != -1:
            attrs.insert(pango.AttrUnderline(
                pango.UNDERLINE_LOW, index_hotkey, index_hotkey + 1))
            attrs.insert(pango.AttrWeight(
                pango.WEIGHT_BOLD, index_hotkey, index_hotkey + 1))
        self._label_en.set_attributes(attrs)
        self.queue_draw()

    def update(self, status):
        if self._status == status:
            return
        self._status = status
        label_fg = (_LABEL_UNTESTED_FG if status == TestState.UNTESTED
                    else BLACK)
        for label in [self._label_en, self._label_zh, self._label_t]:
            label.modify_fg(gtk.STATE_NORMAL, label_fg)
        self.modify_bg(gtk.STATE_NORMAL, LABEL_COLORS[status])
        self.queue_draw()


class TestDirectory(gtk.VBox):
    '''Widget containing a list of tests, colored by test status.

    This is the widget corresponding to the RHS test panel.

    Attributes:
      _label_map: Dict of test path to TestLabelBox objects.  Should
          contain an entry for each test that has been visible at some
          time.
      _visible_status: List of (test, status) pairs reflecting the
          last refresh of the set of visible tests.  This is used to
          rememeber what tests were active, to allow implementation of
          visual refresh only when new active tests appear.
      _shortcut_map: Dict of keyboard shortcut key to test path.
          Tracks the current set of keyboard shortcut mappings for the
          visible set of tests.  This will change when the visible
          test set changes.
    '''

    def __init__(self):
        gtk.VBox.__init__(self)
        self.set_spacing(0)
        self._label_map = {}
        self._visible_status = []
        self._shortcut_map = {}

    def _get_test_label(self, test):
        if test.path in self._label_map:
            return self._label_map[test.path]
        label_box = TestLabelBox(test)
        self._label_map[test.path] = label_box
        return label_box

    def _remove_shortcut(self, path):
        reverse_map = dict((v, k) for k, v in self._shortcut_map.items())
        if path not in reverse_map:
            logging.error('Removal of non-present shortcut for %s' % path)
            return
        shortcut = reverse_map[path]
        del self._shortcut_map[shortcut]

    def _add_shortcut(self, test):
        shortcut = test.kbd_shortcut
        if shortcut in self._shortcut_map:
            logging.error('Shortcut %s already in use by %s; cannot apply to %s'
                          % (shortcut, self._shortcut_map[shortcut], test.path))
            shortcut = None
        if shortcut is None:
            # Find a suitable shortcut.  For groups, use numbers.  For
            # regular tests, use alpha (letters).
            if isinstance(test, factory.TestGroup):
              gen = (x for x in string.digits if x not in self._shortcut_map)
            else:
              gen = (x for x in test.label_en.lower() + string.lowercase
                     if x.isalnum() and x not in self._shortcut_map)
            shortcut = next(gen, None)
        if shortcut is None:
            logging.error('Unable to find shortcut for %s' % test.path)
            return
        self._shortcut_map[shortcut] = test.path
        return shortcut

    def handle_xevent(self, dummy_src, dummy_cond,
                      xhandle, keycode_map, event_client):
        for dummy_i in range(0, xhandle.pending_events()):
            xevent = xhandle.next_event()
            if xevent.type != X.KeyPress:
                continue
            keycode = xevent.detail
            if keycode not in keycode_map:
                logging.warning('Ignoring unknown keycode %r' % keycode)
                continue
            shortcut = keycode_map[keycode]
            if shortcut not in self._shortcut_map:
                logging.warning('Ignoring unbound shortcut %r' % shortcut)
                continue
            test_path = self._shortcut_map[shortcut]
            event_client.post_event(Event(Event.Type.SWITCH_TEST,
                                          key=test_path))
        return True

    def update(self, new_test_status):
        '''Refresh the RHS test list to show current status and active groups.

        Refresh the set of visible tests only when new active tests
        arise.  This avoids visual volatility when switching between
        tests (intervals where no test is active).  Also refresh at
        initial startup.

        Args:
          new_test_status: A list of (test, status) tuples.  The tests
              order should match how they should be displayed in the
              directory (rhs panel).
        '''
        old_active = set(t for t, s in self._visible_status
                         if s == TestState.ACTIVE)
        new_active = set(t for t, s in new_test_status
                         if s == TestState.ACTIVE)
        new_visible = set(t for t, s in new_test_status)
        old_visible = set(t for t, s in self._visible_status)

        if old_active and not new_active - old_active:
            # No new active tests, so do not change the displayed test
            # set, only update the displayed status for currently
            # visible tests.  Not updating _visible_status allows us
            # to remember the last set of active tests.
            for test, _ in self._visible_status:
                status = test.get_state().status
                self._label_map[test.path].update(status)
            return

        self._visible_status = new_test_status

        new_test_map = dict((t.path, t) for t, s in new_test_status)

        for test in old_visible - new_visible:
            label_box = self._label_map[test.path]
            logging.debug('removing %s test label' % test.path)
            self.remove(label_box)
            self._remove_shortcut(test.path)

        new_tests = new_visible - old_visible

        for position, (test, status) in enumerate(new_test_status):
            label_box = self._get_test_label(test)
            if test in new_tests:
                shortcut = self._add_shortcut(test)
                label_box = self._get_test_label(test)
                label_box.set_shortcut(shortcut)
                logging.debug('adding %s test label (sortcut %r, pos %d)' %
                              (test.path, shortcut, position))
                self.pack_start(label_box, False, False)
            self.reorder_child(label_box, position)
            label_box.update(status)

        self.show_all()



class UiState(object):

    def __init__(self, test_widget_box, test_directory_widget, test_list):
        self._test_widget_box = test_widget_box
        self._test_directory_widget = test_directory_widget
        self._test_list = test_list
        self._transition_count = 0
        self._active_test_label_map = None
        self.update_test_state()

    def update_test_state(self):
        state_map = self._test_list.get_state_map()
        active_tests = set(
            t for t in self._test_list.walk()
            if t.is_leaf() and state_map[t].status == TestState.ACTIVE)
        active_groups = set(g for t in active_tests
                            for g in t.get_ancestor_groups())

        def filter_visible_test_state(tests):
            '''List currently visible tests and their status.

            Visible means currently displayed in the RHS panel.
            Visiblity is implied by being a top level test or having
            membership in a group with at least one active test.

            Returns:
              A list of (test, status) tuples for all visible tests,
              in the order they should be displayed.
            '''
            results = []
            for test in tests:
                if isinstance(test, factory.TestGroup):
                    results.append((test, TestState.UNTESTED))
                    if test not in active_groups:
                        continue
                    results += filter_visible_test_state(test.subtests)
                else:
                    results.append((test, state_map[test].status))
            return results

        visible_test_state = filter_visible_test_state(self._test_list.subtests)
        self._test_directory_widget.update(visible_test_state)

        def remove_state_widget():
            for child in self._test_widget_box.get_children():
                self._test_widget_box.remove(child)
            self._active_test_label_map = None

        if not active_tests:
            # Display the "no active tests" widget if there are still no
            # active tests after _NO_ACTIVE_TEST_DELAY_MS.
            def run(transition_count):
                if transition_count != self._transition_count:
                    # Something has happened
                    return False

                self._transition_count += 1
                remove_state_widget()

                self._test_widget_box.set(0.5, 0.5, 0.0, 0.0)
                self._test_widget_box.set_padding(0, 0, 0, 0)
                label_box = gtk.EventBox()
                label_box.modify_bg(gtk.STATE_NORMAL, BLACK)
                label = make_label('no active test', font=_OTHER_LABEL_FONT,
                                   alignment=(0.5, 0.5))
                label_box.add(label)
                self._test_widget_box.add(label_box)
                self._test_widget_box.show_all()

            gobject.timeout_add(_NO_ACTIVE_TEST_DELAY_MS, run,
                                self._transition_count)
            return

        self._transition_count += 1

        if any(t.has_ui for t in active_tests):
            # Remove the widget (if any) since there is an active test
            # with a UI.
            remove_state_widget()
            return

        if (self._active_test_label_map is not None and
            all(t in self._active_test_label_map for t in active_tests)):
            # All active tests are already present in the summary, so just
            # update their states.
            for test, label in self._active_test_label_map.iteritems():
                label.modify_fg(
                    gtk.STATE_NORMAL,
                    LABEL_COLORS[state_map[test].status])
            return

        remove_state_widget()
        # No active UI; draw summary of current test states
        self._test_widget_box.set(0.5, 0.0, 0.0, 0.0)
        self._test_widget_box.set_padding(40, 0, 0, 0)
        vbox, self._active_test_label_map = make_summary_box(
            [t for t in self._test_list.subtests
             if state_map[t].status == TestState.ACTIVE],
            state_map)
        self._test_widget_box.add(vbox)
        self._test_widget_box.show_all()


def grab_shortcut_keys(disp, event_handler, event_client):
    # We want to receive KeyPress events
    root = disp.screen().root
    root.change_attributes(event_mask = X.KeyPressMask)
    shortcut_set = set(string.lowercase + string.digits)
    keycode_map = {}
    for mod, shortcut in ([(X.ControlMask, k) for k in shortcut_set] +
                          [(X.Mod1Mask, 'Tab')]):  # Mod1 = Alt
        keysym = gtk.gdk.keyval_from_name(shortcut)
        keycode = disp.keysym_to_keycode(keysym)
        keycode_map[keycode] = shortcut
        root.grab_key(keycode, mod, 1, X.GrabModeAsync, X.GrabModeAsync)
    # This flushes the XGrabKey calls to the server.
    for dummy_x in range(0, root.display.pending_events()):
        root.display.next_event()
    gobject.io_add_watch(root.display, gobject.IO_IN, event_handler,
                         root.display, keycode_map, event_client)


def main(test_list_path):
    '''Starts the main UI.

    This is launched by the autotest/cros/factory/client.
    When operators press keyboard shortcuts, the shortcut
    value is sent as an event to the control program.'''

    test_list = None
    ui_state = None
    event_client = None

    def handle_key_release_event(_, event):
        logging.info('base ui key event (%s)', event.keyval)
        return True

    def handle_event(event):
        if event.type == Event.Type.STATE_CHANGE:
            ui_state.update_test_state()

    test_list = factory.read_test_list(test_list_path)

    window = gtk.Window(gtk.WINDOW_TOPLEVEL)
    window.connect('destroy', lambda _: gtk.main_quit())
    window.modify_bg(gtk.STATE_NORMAL, BLACK)

    disp = Display()

    event_client = EventClient(
        callback=handle_event,
        event_loop=EventClient.EVENT_LOOP_GOBJECT_IO)

    screen = window.get_screen()
    if (screen is None):
        logging.info('ERROR: communication with the X server is not working, ' +
                    'could not find a working screen.  UI exiting.')
        sys.exit(1)

    screen_size_str = os.environ.get('CROS_SCREEN_SIZE')
    if screen_size_str:
        match = re.match(r'^(\d+)x(\d+)$', screen_size_str)
        assert match, 'CROS_SCREEN_SIZE should be {width}x{height}'
        screen_size = (int(match.group(1)), int(match.group(2)))
    else:
        screen_size = (screen.get_width(), screen.get_height())
    window.set_size_request(*screen_size)

    test_directory = TestDirectory()

    rhs_box = gtk.EventBox()
    rhs_box.modify_bg(gtk.STATE_NORMAL, _LABEL_TROUGH_COLOR)
    rhs_box.add(test_directory)

    console_box = gtk.EventBox()
    console_box.set_size_request(*convert_pixels((-1, 180)))
    console_box.modify_bg(gtk.STATE_NORMAL, BLACK)

    test_widget_box = gtk.Alignment()
    test_widget_box.set_size_request(-1, -1)

    lhs_box = gtk.VBox()
    lhs_box.pack_end(console_box, False, False)
    lhs_box.pack_start(test_widget_box)
    lhs_box.pack_start(make_hsep(3), False, False)

    base_box = gtk.HBox()
    base_box.pack_end(rhs_box, False, False)
    base_box.pack_end(make_vsep(3), False, False)
    base_box.pack_start(lhs_box)

    window.connect('key-release-event', handle_key_release_event)
    window.add_events(gtk.gdk.KEY_RELEASE_MASK)

    ui_state = UiState(test_widget_box, test_directory, test_list)

    window.add(base_box)
    window.show_all()

    grab_shortcut_keys(disp, test_directory.handle_xevent, event_client)

    hide_cursor(window.window)

    test_widget_allocation = test_widget_box.get_allocation()
    test_widget_size = (test_widget_allocation.width,
                        test_widget_allocation.height)
    factory.set_shared_data('test_widget_size', test_widget_size)

    dummy_console = Console(console_box.get_allocation())

    event_client.post_event(Event(Event.Type.UI_READY))

    logging.info('cros/factory/ui setup done, starting gtk.main()...')
    gtk.main()
    logging.info('cros/factory/ui gtk.main() finished, exiting.')


if __name__ == '__main__':
    parser = OptionParser(usage='usage: %prog [options] TEST-LIST-PATH')
    parser.add_option('-v', '--verbose', dest='verbose',
                      action='store_true',
                      help='Enable debug logging')
    (options, args) = parser.parse_args()

    if len(args) != 1:
        parser.error('Incorrect number of arguments')

    factory.init_logging('ui', verbose=options.verbose)
    main(sys.argv[1])