import toga
from colosseum import CSS

class StartApp(toga.App):
    def startup(self):
        self.main_window = toga.MainWindow(self.name)
        self.main_window.app = self

        self.input_box = toga.Box()

        multiple_input = toga.Box(style=CSS(flex_direction='row', margin=10))
        m_label = toga.Label('Multiple Text Input: ')
        self.m_input = toga.MultilineTextInput('OLAR')

        multiple_input.add(m_label)
        multiple_input.add(self.m_input)

        self.input_box.add(multiple_input)

        self.control_box = toga.Box()

        update_tree_button = toga.Button('Update Tree',
                                        on_press=self.callbackUpdate)

        self.control_box.add(update_tree_button)

        frame = toga.SplitContainer()
        frame.content = [self.input_box, self.control_box]

        self.main_window.content = frame
        self.main_window.show()

    def callbackUpdate(self, event):
        self.m_input.clear()

def main():
    app = StartApp('MultilineTextInput Test', 'org.pybee.test')
    app.main_loop()

if __name__ == '__main__':
    main()