# (C) Copyright 2004-2021 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!

"""
This demo illustrates use of the LEDEditor for displaying numeric values
using a simulated LED display control.
"""

from threading  import Thread

from time import sleep

from traits.api import HasTraits, Instance, Int, Bool, Float

from traitsui.api import View, Item, HGroup, Handler, UIInfo, spring

from traits.etsconfig.api import ETSConfig
if ETSConfig.toolkit == 'wx':
    from traitsui.wx.extra.led_editor import LEDEditor
else:
    from traitsui.qt4.extra.led_editor import LEDEditor

# Handler class for the LEDDemo class view:


class LEDDemoHandler(Handler):

    # The UIInfo object associated with the UI:
    info = Instance(UIInfo)

    # Is the demo currently running:
    running = Bool(True)

    # Is the thread still alive?
    alive = Bool(True)

    def init(self, info):
        self.info = info
        Thread(target=self._update_counter).start()

    def closed(self, info, is_ok):
        self.running = False
        while self.alive:
            sleep(.05)

    def _update_counter(self):
        while self.running:
            self.info.object.counter1 += 1
            self.info.object.counter2 += .001
            sleep(.01)
        self.alive = False

# The main demo class:


class LEDDemo(HasTraits):

    # A counter to display:
    counter1 = Int()

    # A floating point value to display:
    counter2 = Float()

    # The traits view:
    view = View(
        Item('counter1',
             label='Left aligned',
             editor=LEDEditor(alignment='left')
             ),
        Item('counter1',
             label='Center aligned',
             editor=LEDEditor(alignment='center')
             ),
        Item('counter1',
             label='Right aligned',
             editor=LEDEditor()  # default = 'right' aligned
             ),
        Item('counter2',
             label='Float value',
             editor=LEDEditor(format_str='%.3f')
             ),
        '_',
        HGroup(
            Item('counter1',
                 label='Left',
                 height=-40,
                 width=120,
                 editor=LEDEditor(alignment='left')
                 ),
            spring,
            Item('counter1',
                 label='Center',
                 height=-40,
                 width=120,
                 editor=LEDEditor(alignment='center')
                 ),
            spring,
            Item('counter1',
                 label='Right',
                 height=-40,
                 width=120,
                 editor=LEDEditor()  # default = 'right' aligned
                 ),
            spring,
            Item('counter2',
                 label='Float',
                 height=-40,
                 width=120,
                 editor=LEDEditor(format_str='%.3f')
                 )
        ),
        title='LED Editor Demo',
        buttons=['OK'],
        handler=LEDDemoHandler
    )

# Create the demo:
demo = LEDDemo()

# Run the demo (if invoked from the command line):
if __name__ == '__main__':
    demo.configure_traits()
