enaml popups

popup_view_mod.enaml

import os
os.environ['QT_API'] = 'pyside'
from PySide.QtCore import QTimer, QObject
from atom.api import Atom, Event, Bool
from enaml.core.api import Include
from enaml.widgets.api import (
    Window, Container, PopupView, Form, Label, PushButton
)

class Model(Atom):
    busy = Bool()

class SandwichController(object):
    steps = (
             ('Preparing bread',1.2),
             ('Adding meat to the sandwich',2.0),
             ('Adding cheese to the sandwich',2.0),
             ('Toasting the sandwich',5.0),
             ('Adding vegetables to the sandwich',2.0),
             ('Your sandwich is ready',0)
             )
    def __init__(self, view):
        self.view = view
        self.popup = self._newPopup()
    def _newPopup(self):
        p = NotificationPopup(self.view, window_type='window')
        p.timeout = 1.0
        return p
    def step(self):
        msg, time = self.steps[self.state]
        self.displayMessage(msg)
        def timerdone():
            self.state += 1
            self.step()
        if time > 0:
            QTimer.singleShot(int(time*1000), timerdone)
        else:
            self.done()        
    def start(self):
        self.view.model.busy = True
        self.state = 0
        self.step()
    def displayMessage(self, msg):
        if self.popup.visible:
            self.popup.close()
        self.popup = self._newPopup()
        self.popup.msg = msg
        self.popup.show()
    def done(self):
        self.view.model.busy = False

enamldef NotificationPopup(PopupView):
    attr msg = ''
    foreground = 'white'
    background = 'rgba(30, 30, 30, 0.85)'
    window_type = 'tool_tip'
    parent_anchor = (1.0, 1.0)
    anchor = (1.0, 1.0)
    offset = (-10, -10)
    timeout = 5
    fade_in_duration = 500
    fade_out_duration = 500
    Container:
        Label:
            foreground = 'white'
            text << msg
            align = 'center'

def make_sandwich(view):
    if not view.model.busy:
        SandwichController(view).start()        
            
enamldef Main(Window): win:
    initial_size = (400, 400)
    attr model = Model()
    Container:
        PushButton:
            text = 'Make Sandwich'
            enabled << not model.busy
            clicked :: make_sandwich(win)