import maya.cmds as mc

class ScriptJobUI(object):

    def __init__(self):

        self.__window = 'SelectEdgeJob'
        self.__currentJobId = None

        # Check to see if the Window exists, Delete Window
        if mc.window(self.__window, query=True, exists=True):
            mc.deleteUI(self.__window)

        # Define window attributes
        self.__window = mc.window(self.__window, title='SelectEdgeJob', sizeable=True)

        # Create menu bar with help
        menuBarLayout = mc.menuBarLayout()
        helpMenu = mc.menu( label='help', tearOff=False )
        howToHelp = mc.menuItem( label='How to use', command=loadHelp)

        # Main Layout of all menu is a form
        mainFormLayout = mc.formLayout()
        menuSeparator = mc.separator(style='in')
        bottomSeparator = mc.separator(style='in')

        # create button to launch function
        startSelectionButton = mc.button(label='Start Selection', command=startScriptJob)

        # create button to complete function
        endtSelectionButton = mc.button(label='End Selection', command=endScriptJob)

        # Position the controls MainForm
        mc.formLayout(mainFormLayout, edit=True, # attach to the form
            attachForm=[
                (menuSeparator, 'top',3),
                (menuSeparator, 'left',3),
                (menuSeparator, 'right',3),

                (startSelectionButton, 'left',3),
                (endtSelectionButton, 'right',3),

                (bottomSeparator, 'left',3),
                (bottomSeparator, 'right',3),
                (bottomSeparator, 'bottom',5),
            ],

            # Attach controls to positions
            attachPosition=[
                (startSelectionButton, 'right', 2, 50),
                (endtSelectionButton, 'left', 2, 50),
            ],

            # Attach controls to other controls
            attachControl=[
                (startSelectionButton, 'top',5,menuSeparator),
                (endtSelectionButton, 'top',5,menuSeparator),
            ],
        )

    def show(self):
        mc.showWindow(self.__window)

    def startScriptJob(self, *args):
        self.endScriptJob()  # make sure an old one is dead first

        print 'StartJob'
        newJob = mc.scriptJob(event=['SelectionChanged', self.selectionChanged])
        print 'JOBNUMBER:', newJob

        self.__currentJobId = newJob

    def endScriptJob(self, *args):
        if self.__currentJobId is not None:
            print 'EndJob'
            mc.scriptJob(kill=self.__currentJobId, force=True)

    def loadHelp(self, *args):
        pass

    def selectionChanged(self, *args):
        print 'Script Job Executed!'


ui = ScriptJobUI()
ui.show()