Question

I’ve been tried to put a button at my class at Jython. I’m using SWT components to create my GUI. The button doesn’t appear, but the window appear normally. I already create this class at Java, and works well.

This is my code, what is wrong?

from java.lang import Thread as JThread, InterruptedException
from org.eclipse.swt import widgets, layout, SWT 
from org.eclipse.swt.layout import GridLayout, GridData, FillLayout
from org.eclipse.swt.widgets import Composite, Listener#, Event
from org.yakindu.sct.runtime.java.new64 import New64CycleBasedStatemachine
import time

class Cycle(object):
    def __init__(self):

        self.display = widgets.Display()
        self.shell = widgets.Shell(self.display, SWT.SHELL_TRIM | SWT.APPLICATION_MODAL)
        self.shell.setLayout(layout.RowLayout())
        self.shell.setText("Message Window")
        self.shell.setLocation(300, 300)
        self.shell.setSize(300, 150)
        self.thread = JThread()
        self.shell.open()

    def run(self):
        self.statemachine = New64CycleBasedStatemachine()
        self.statemachine.enter()
        while not self.thread.isInterrupted():
            self.statemachine.getInterfaceNewTest().getVarMessage()
            self.statemachine.runCycle()
            try: 
                time.sleep(100)
            except InterruptedException: 
                self.thread.interrupt()


        self.thread.start()

    def show_window(self):
        while not self.shell.isDisposed():
            if not self.display.readAndDispatch():
                self.display.sleep()
        self.display.dispose()

        self.thread.interrupted()

    def create_button(self, statemachine, shell):
        self.buttonComposite = Composite(shell, SWT.NO_SCROLL)
        self.buttonCompositeGridData =  GridData()
        self.buttonCompositeGridData.horizontalAlignment = GridData.FILL
        self.buttonCompositeGridData.grabExcessHorizontalSpace = True
        self.buttonComposite.setLayoutData(self.buttonCompositeGridData)
        self.buttonCompositeLayout = FillLayout()
        self.buttonCompositeLayout.type = SWT.HORIZONTAL
        fillLayout = FillLayout()

        self.buttonComposite.setLayout(fillLayout)
        self.button = widgets.Button(self.buttonComposite, SWT.PUSH);
        self.button.setText("Ok")


foo = Cycle()
foo.run()
foo.create_button()
foo.show_window()

Answer 1

There are multiple issues:

1. The position of the self.shell.open(). You are calling create_button() after opening the shell !! See the javadoc of shell.open().
2. You are using RowLayout, then creating a GridData and then setting a FillLayout. I won’t tell you the problem. Run the code and see.

Working Example From Your Snippet

from java.lang import Thread as JThread, InterruptedException
from org.eclipse.swt import widgets, layout, SWT 
from org.eclipse.swt.layout import GridLayout, GridData, FillLayout
from org.eclipse.swt.widgets import Composite, Listener#, Event

import time

class Cycle(object):
    def __init__(self):

        self.display = widgets.Display()
        self.shell = widgets.Shell(self.display, SWT.SHELL_TRIM | SWT.APPLICATION_MODAL)
        self.shell.setLayout(layout.RowLayout())
        self.shell.setText("Message Window")
        self.shell.setLocation(300, 300)
        self.shell.setSize(300, 150)

    def show_window(self):
        self.shell.open() // I have moved it here. After all the control creation !!
        while not self.shell.isDisposed():
            if not self.display.readAndDispatch():
                self.display.sleep()
        self.display.dispose()


    def create_button(self):
        self.buttonComposite = Composite(self.shell, SWT.NO_SCROLL)
        #self.buttonCompositeGridData =  GridData()
        #self.buttonCompositeGridData.horizontalAlignment = GridData.FILL
        #self.buttonCompositeGridData.grabExcessHorizontalSpace = True
        #self.buttonComposite.setLayoutData(self.buttonCompositeGridData)
        self.buttonCompositeLayout = FillLayout()
        self.buttonCompositeLayout.type = SWT.HORIZONTAL
        fillLayout = FillLayout()

        self.buttonComposite.setLayout(fillLayout)
        self.button = widgets.Button(self.buttonComposite, SWT.PUSH);
        self.button.setText("Ok")


foo = Cycle()
foo.create_button()
foo.show_window()

Output-