test case for enaml

buttontest2.py

import sys    
import enaml
from enaml.qt.qt_application import QtApplication
from atom.api import Atom, Bool       
from PySide.QtCore import (Qt)
    
class P1P2Model(Atom):
    p1 = Bool()
    p2 = Bool()

class P1Observer(object):
    def __init__(self, model):
        self.model = model
        model.observe('p1', self.onP1Change)
    def onP1Change(self, change):
    	p1old = self.model.p1
    	p2old = self.model.p2
        print "P1Observer sees p1 = %s, sets p2 from %s -> %s" % (p1old, p2old, p1old)
        self.model.p2 = p1old
    
def printchange(change):
    print "Event occurred: %s" % change

if __name__ == '__main__':
    viewfirst = len(sys.argv) > 1 and sys.argv[1] == 'viewfirst'
    with enaml.imports():
        from buttontest2view import Main as MainView
            
        app = QtApplication()
        model = P1P2Model()
        model.observe('p1', printchange)
        model.observe('p2', printchange)
	
        if viewfirst:
            view = MainView(model=model)
            view.show()
            obs = P1Observer(model)
        else:
            obs = P1Observer(model)
            view = MainView(model=model)
            view.show()
        app.start()   

buttontest2view.enaml

from enaml.core.api import Include
from enaml.widgets.api import (
    Window, Container, PushButton, Label
)
from atom.api import Atom, Bool, Member

def bequal(p1, p2):
    print "enamlview Main sees a change: p1=%s p2=%s" % (p1,p2)
    return (p1 and p2) or (not p1 and not p2)

enamldef Main(Window): win:
    attr model
    Container:
        PushButton: go:
            text << 'stop' if model.p1 else 'go' 
            clicked :: model.p1 = not model.p2
            enabled << bequal(model.p1, model.p2) 
        Label: p1:
            text << 'p1' if model.p1 else ''
        Label: p2:
            text << 'p2' if model.p2 else ''