kopia lustrzana https://github.com/peterhinch/micropython-micro-gui
75 wiersze
2.1 KiB
Python
75 wiersze
2.1 KiB
Python
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# listbox_var.py micro-gui demo of Listbox class with variable elements
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# Released under the MIT License (MIT). See LICENSE.
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# Copyright (c) 2024 Peter Hinch
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# hardware_setup must be imported before other modules because of RAM use.
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from hardware_setup import ssd # Create a display instance
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from gui.core.ugui import Screen
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from gui.core.writer import CWriter
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from gui.core.colors import *
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from gui.widgets import Listbox, Button, CloseButton
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import gui.fonts.freesans20 as font
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def newtext(): # Create new listbox entries
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strings = ("Iron", "Copper", "Lead", "Zinc")
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n = 0
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while True:
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yield strings[n]
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n = (n + 1) % len(strings)
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ntxt = newtext() # Instantiate the generator
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class BaseScreen(Screen):
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def __init__(self):
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super().__init__()
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wri = CWriter(ssd, font, GREEN, BLACK, verbose=False)
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self.els = [
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"Hydrogen",
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"Helium",
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"Neon",
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"Xenon",
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"Radon",
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"Uranium",
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"Plutonium",
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"Actinium",
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]
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self.lb = Listbox(
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wri,
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2,
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2,
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elements=self.els,
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dlines=5,
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bdcolor=RED,
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value=1,
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callback=self.lbcb,
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also=Listbox.ON_LEAVE,
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)
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Button(wri, 2, 120, height=25, text="del", callback=self.delcb)
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Button(wri, 32, 120, height=25, text="add", callback=self.addcb)
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Button(wri, 62, 120, height=25, text="h2", callback=self.gocb, args=("Hydrogen",))
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Button(wri, 92, 120, height=25, text="fe", callback=self.gocb, args=("Iron",))
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CloseButton(wri)
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def lbcb(self, lb): # Listbox callback
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print(lb.textvalue())
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def gocb(self, _, txt): # Go button callback: Move currency to specified entry
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self.lb.textvalue(txt)
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def addcb(self, _): # Add button callback
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self.els.append(next(ntxt)) # Append a new entry
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self.lb.update()
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def delcb(self, _): # Delete button callback
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del self.els[self.lb.value()] # Delete current entry
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self.lb.update()
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Screen.change(BaseScreen)
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