Question: Why are Widgets not displayed?

[josipbudzaki]

I'm trying to run a basic UI according to layouts in the doc, but the Widgets are not displayed (just getting blank screen):

from time import sleep
from asciimatics.screen import ManagedScreen
from asciimatics.widgets import Frame, Text, TextBox, Layout, Label, Button, PopUpDialog, Widget

def run():
    with ManagedScreen() as screen:
        frame = Frame(screen, 80, 20, has_border=False)
        layout = Layout([100], fill_frame=True)
        frame.add_layout(layout)
        layout.add_widget(Text("Name:", "name"))
        layout.add_widget(Text("Address:", "address"))
        layout.add_widget(Text("Phone number:", "phone"))
        layout.add_widget(Text("Email address:", "email"))
        layout.add_widget(TextBox(
            Widget.FILL_FRAME, "Notes:", "notes", as_string=True, line_wrap=True))
        frame.fix()
        screen.refresh()
        sleep(10)
run()

What am I doing wrong here?

• Do widgets work with ManagedScreen? or
• Does Screen need to have a Scene?

[peterbrittain]

Your Frame is a sub-class of Effect and so like all Effects needs to be played by the Screen. Rather than calling screen.refresh() try calling screen.play(...) passing in the Scene that includes your Frame.

The sort of thing you need is in the sample code - e.g. here: https://github.com/peterbrittain/asciimatics/blob/c7accc93d3e9ead2337364f97d938340bbda1695/samples/forms.py#L224-L227

[josipbudzaki]

Thanks for the hint. For the sake of completeness, here's my solution:

from time import sleep
from asciimatics.scene import Scene
from asciimatics.screen import Screen, ManagedScreen
from asciimatics.widgets import Frame, Text, TextBox, Layout, Label, Button, PopUpDialog, Widget

class FormFrame(Frame):
    def __init__(self, screen):
        super(FormFrame, self).__init__(screen,
            int(screen.height // 3),
            screen.width // 2,
            y=0,
            has_border=True,
            can_scroll=True,
            name="Form Frame")
        layout = Layout([100], fill_frame=True)
        self.add_layout(layout)
        layout.add_widget(Text("Name:", "name"))
        layout.add_widget(Text("Address:", "address"))
        layout.add_widget(Text("Phone number:", "phone"))
        layout.add_widget(Text("Email address:", "email"))
        layout.add_widget(TextBox(
            Widget.FILL_FRAME, "Notes:", "notes", as_string=True, line_wrap=True))
        self.fix()
        # screen.refresh()
        # sleep(10)

def run(screen, scene):
    scenes = [Scene([FormFrame(screen)], -1)]

    screen.play(scenes, stop_on_resize=True, start_scene=scene, allow_int=True)

last_scene = None
Screen.wrapper(run, catch_interrupt=False, arguments=[last_scene])