How to use the remi.gui.Button function in remi

def __init__(self, multiple_selection, selection_folder, allow_file_selection, allow_folder_selection, **kwargs):
        super(FileFolderNavigator, self).__init__(**kwargs)
        self.set_layout_orientation(Container.LAYOUT_VERTICAL)
        self.style['width'] = '100%'

        self.multiple_selection = multiple_selection
        self.allow_file_selection = allow_file_selection
        self.allow_folder_selection = allow_folder_selection
        self.selectionlist = []
        self.controlsContainer = Widget()
        self.controlsContainer.set_size('100%', '30px')
        self.controlsContainer.style['display'] = 'flex'
        self.controlsContainer.set_layout_orientation(Container.LAYOUT_HORIZONTAL)
        self.controlBack = Button('Up')
        self.controlBack.set_size('10%', '100%')
        self.controlBack.onclick.connect(self.dir_go_back)
        self.controlGo = Button('Go >>')
        self.controlGo.set_size('10%', '100%')
        self.controlGo.onclick.connect(self.dir_go)
        self.pathEditor = TextInput()
        self.pathEditor.set_size('80%', '100%')
        self.pathEditor.style['resize'] = 'none'
        self.pathEditor.attributes['rows'] = '1'
        self.controlsContainer.append(self.controlBack)
        self.controlsContainer.append(self.pathEditor)
        self.controlsContainer.append(self.controlGo)

        self.itemContainer = Widget(width='100%',height=300)

        self.append(self.controlsContainer)

def __init__(self, button_label='epics button', epics_pv_name='', toggle=False, *args, **kwargs):
        self.color_inactive = 'darkgray'
        self.color_active = 'rgb(0,255,0)'
        self.button = gui.Button(button_label, width="100%", height="100%", style=style_inheritance_dict)
        self.led = gui.Widget(width=15, height=5, style={'position':'absolute', 'left':'2px', 'top':'2px', 'background-color':self.color_inactive})
        self.led_status = False
        default_style = {'position':'absolute','left':'10px','top':'10px', 'background-color':'rgb(4, 90, 188)', 'color':'white'}
        default_style.update(kwargs.get('style',{}))
        kwargs['style'] = default_style
        kwargs['width'] = kwargs['style'].get('width', kwargs.get('width','100px'))
        kwargs['height'] = kwargs['style'].get('height', kwargs.get('height','100px'))
        super(EPICSBooleanButton, self).__init__(*args, **kwargs)
        _style = {'position':'relative'}
        _style.update(style_inheritance_dict)
        self.append(gui.Container(children=[self.button, self.led], width="100%", height="100%", style=_style))
        self.toggle = toggle
        self.epics_pv_name = epics_pv_name
        self.button.onmousedown.do(self.set_bit)

def main(self):
        #creating a container GridBox type
        main_container = gui.GridBox(width='100%', height='100%', style={'margin':'0px auto'})
        
        label = gui.Label('This is a label')
        label.style['background-color'] = 'lightgreen'
        
        button = gui.Button('Change layout', height='100%')
        button.onclick.do(self.redefine_grid, main_container)
        
        text = gui.TextInput()

        
        main_container.set_from_asciiart("""
            |label |button                      |
            |label |text                        |
            |label |text                        |
            |label |text                        |
            |label |text                        |
            """, 10, 10)

        main_container.append({'label':label, 'button':button, 'text':text})

        # returning the root widget

self.style['margin'] = '0px auto'

        if len(title) > 0:
            t = Label(title)
            t.add_class('DialogTitle')
            self.append(t)

        if content is not None:
            self.append(content)

        self.container = Widget()
        self.container.style['display'] = 'block'
        self.container.style['overflow'] = 'auto'
        self.container.style['margin'] = '5px'
        self.container.set_layout_orientation(Widget.LAYOUT_VERTICAL)
        self.conf = Button('Ok')
        self.conf.set_size(100, 30)
        self.conf.style['margin'] = '3px'
        hlay = Widget(height=35)
        hlay.style['display'] = 'block'
        hlay.style['overflow'] = 'visible'
        hlay.append(self.conf)
        self.conf.style['float'] = 'right'

        self.append(self.container)
        self.append(hlay)

        self.conf.attributes[self.EVENT_ONCLICK] = "sendCallback('%s','%s');" % (self.identifier, self.EVENT_ONCONFIRM)

        self.inputs = {}

        self._base_app_instance = None

def main(self):
        wid = gui.VBox(width=300, height=200, margin='0px auto')
        self.lbl = gui.Label('Press the button', width='80%', height='50%')
        self.lbl.style['margin'] = 'auto'
        self.bt = gui.Button('Press me!', width=200, height=30)
        self.bt.style['margin'] = 'auto 50px'

        # setting the listener for the onclick event of the button
        self.bt.onclick.do(self.on_button_pressed)

        # appending a widget to another, the first argument is a string key
        wid.append(self.lbl)
        wid.append(self.bt)

        # returning the root widget
        return wid

def main(self):
        #margin 0px auto allows to center the app to the screen
        wid = gui.VBox(width=300, height=200, margin='0px auto')
        self.lbl = gui.Label('Thread result:', width='80%', height='50%')
        self.lbl.style['margin'] = 'auto'

        bt = gui.Button('Stop algorithm', width=200, height=30)
        bt.style['margin'] = 'auto 50px'
        bt.style['background-color'] = 'red'

        wid.append(self.lbl)
        wid.append(bt)

        self.thread_alive_flag = True
        self.my_thread_result = 0
        #Here I start a parallel thread that executes my algorithm for a long time
        t = threading.Thread(target=self.my_intensive_long_time_algorithm)
        t.start()
        
        bt.onclick.do(self.on_button_pressed)

        # returning the root widget
        return wid

self.txt.onchange.connect(self.on_text_area_change)

        self.spin = gui.SpinBox(1, 0, 100, width=200, height=30, margin='10px')
        self.spin.onchange.connect(self.on_spin_change)

        self.progress = gui.Progress(1, 100, width=200, height=5)

        self.check = gui.CheckBoxLabel(
            'Label checkbox', True, width=200, height=30, margin='10px')
        self.check.onchange.connect(self.on_check_change)

        self.btInputDiag = gui.Button(
            'Open InputDialog', width=200, height=30, margin='10px')
        self.btInputDiag.onclick.connect(self.open_input_dialog)

        self.btFileDiag = gui.Button(
            'File Selection Dialog', width=200, height=30, margin='10px')
        self.btFileDiag.onclick.connect(self.open_fileselection_dialog)

        self.btUploadFile = gui.FileUploader(
            './', width=200, height=30, margin='10px')
        self.btUploadFile.onsuccess.connect(self.fileupload_on_success)
        self.btUploadFile.onfailed.connect(self.fileupload_on_failed)

        items = ('Danny Young', 'Christine Holand',
                 'Lars Gordon', 'Roberto Robitaille')
        self.listView = gui.ListView.new_from_list(
            items, width=300, height=120, margin='10px')
        self.listView.onselection.connect(self.list_view_on_selected)

        self.link = gui.Link("http://localhost:8081", "A link to here",
                             width=200, height=30, margin='10px')

if cancel_name !='' or confirm_name !='':
            hlay = gui.Widget(height=35)
            hlay.style['display'] = 'block'
            hlay.style['overflow'] = 'visible'


        if confirm_name !='':
            self.conf = gui.Button(confirm_name)
            self.conf.set_size(100, 30)
            self.conf.style['margin'] = '3px'
            self.conf.style['float'] = 'right'
            self.conf.attributes[self.EVENT_ONCLICK] = "sendCallback('%s','%s');" % (self.identifier, self.EVENT_ONCONFIRM)
            hlay.append(self.conf)
            
        if cancel_name != '':
            self.cancel = gui.Button(cancel_name)
            self.cancel.set_size(100, 30)
            self.cancel.style['margin'] = '3px'
            self.cancel.style['float'] = 'right'
            self.cancel.attributes[self.EVENT_ONCLICK] = "sendCallback('%s','%s');" % (self.identifier, self.EVENT_ONCANCEL)
            hlay.append(self.cancel)
            
        if cancel_name !='' or confirm_name !='':
            self.append(hlay)

        self.inputs = {}

def main(self, name='world'):
        # margin 0px auto allows to center the app to the screen
        wid = gui.VBox(width=300, height=200, margin='0px auto')

        bt = gui.Button('Close App', width=200, height=30)
        bt.style['margin'] = 'auto 50px'
        bt.style['background-color'] = 'red'

        bt.onclick.do(self.on_button_pressed)

        wid.append(bt)
        return wid

super(FileFolderNavigator, self).__init__(**kwargs)
        self.set_layout_orientation(Container.LAYOUT_VERTICAL)
        self.style['width'] = '100%'

        self.multiple_selection = multiple_selection
        self.allow_file_selection = allow_file_selection
        self.allow_folder_selection = allow_folder_selection
        self.selectionlist = []
        self.controlsContainer = Widget()
        self.controlsContainer.set_size('100%', '30px')
        self.controlsContainer.style['display'] = 'flex'
        self.controlsContainer.set_layout_orientation(Container.LAYOUT_HORIZONTAL)
        self.controlBack = Button('Up')
        self.controlBack.set_size('10%', '100%')
        self.controlBack.onclick.connect(self.dir_go_back)
        self.controlGo = Button('Go >>')
        self.controlGo.set_size('10%', '100%')
        self.controlGo.onclick.connect(self.dir_go)
        self.pathEditor = TextInput()
        self.pathEditor.set_size('80%', '100%')
        self.pathEditor.style['resize'] = 'none'
        self.pathEditor.attributes['rows'] = '1'
        self.controlsContainer.append(self.controlBack)
        self.controlsContainer.append(self.pathEditor)
        self.controlsContainer.append(self.controlGo)

        self.itemContainer = Widget(width='100%',height=300)

        self.append(self.controlsContainer)
        self.append(self.itemContainer, key='items')  # defined key as this is replaced later

        self.folderItems = list()