micropython-nano-gui/gui/demos/tbox.py

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Python
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# tbox.py Test/demo of Textbox widget for nano-gui
# Released under the MIT License (MIT). See LICENSE.
# Copyright (c) 2020 Peter Hinch
# Usage:
# import gui.demos.tbox
# Initialise hardware and framebuf before importing modules.
from color_setup import ssd # Create a display instance
from gui.core.nanogui import refresh
from gui.core.writer import CWriter
import asyncio
from gui.core.colors import *
import gui.fonts.arial10 as arial10
from gui.widgets.label import Label
from gui.widgets.textbox import Textbox
# Args common to both Textbox instances
# Positional
pargs = (2, 2, 124, 7) # Row, Col, Width, nlines
# Keyword
tbargs = {
"fgcolor": YELLOW,
"bdcolor": RED,
"bgcolor": DARKGREEN,
}
async def wrap(wri):
s = """The textbox displays multiple lines of text in a field of fixed dimensions. \
Text may be clipped to the width of the control or may be word-wrapped. If the number \
of lines of text exceeds the height available, scrolling may be performed \
by calling a method.
"""
tb = Textbox(wri, *pargs, clip=False, **tbargs)
tb.append(s, ntrim=100, line=0)
refresh(ssd)
while True:
await asyncio.sleep(1)
if not tb.scroll(1):
break
refresh(ssd)
async def clip(wri):
ss = (
"clip demo",
"short",
"longer line",
"much longer line with spaces",
"antidisestablishmentarianism",
"line with\nline break",
"Done",
)
tb = Textbox(wri, *pargs, clip=True, **tbargs)
for s in ss:
tb.append(s, ntrim=100) # Default line=None scrolls to show most recent
refresh(ssd)
await asyncio.sleep(1)
async def main(wri):
await wrap(wri)
await clip(wri)
def test():
refresh(ssd, True) # Initialise and clear display.
CWriter.set_textpos(ssd, 0, 0) # In case previous tests have altered it
wri = CWriter(ssd, arial10, verbose=False)
wri.set_clip(True, True, False)
asyncio.run(main(wri))
test()