kopia lustrzana https://github.com/peterhinch/micropython-micro-gui
99 wiersze
2.4 KiB
Python
99 wiersze
2.4 KiB
Python
# screen_replace.py deemo showing non-stacked screens
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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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import hardware_setup # Create a display instance
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from gui.core.ugui import Screen, ssd
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from gui.widgets import Button, CloseButton, Label
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from gui.core.writer import CWriter
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# Font for CWriter
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import gui.fonts.freesans20 as font
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from gui.core.colors import *
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wri = CWriter(ssd, font, GREEN, BLACK, verbose=False)
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# Defining a button in this way enables it to be re-used on
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# multiple Screen instances. Note that a Screen class is
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# passed, not an instance.
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def fwdbutton(wri, row, col, cls_screen, text="Next", args=()):
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def fwd(button):
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Screen.change(cls_screen, args=args) # Callback
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Button(wri, row, col, height=30, callback=fwd, fgcolor=BLACK, bgcolor=GREEN, text=text)
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def navbutton(wri, row, col, gen, delta, text):
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def nav(button):
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cls_screen, num = gen(delta) # gen.send(delta)
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Screen.change(cls_screen, mode=Screen.REPLACE, args=(num,)) # Callback
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Button(wri, row, col, height=30, callback=nav, fgcolor=BLACK, bgcolor=YELLOW, text=text)
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class RingScreen(Screen):
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def __init__(self, num):
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super().__init__()
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Label(wri, 2, 2, f"Ring screen no. {num}.")
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navbutton(wri, 40, 2, nav, -1, "Left")
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navbutton(wri, 40, 80, nav, 1, "Right")
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CloseButton(wri)
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# Create a tuple of Screen subclasses (in this case all are identical).
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ring = ((RingScreen, 0), (RingScreen, 1), (RingScreen, 2))
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# Define a means of navigating between these classes
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def navigator():
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x = 0
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def nav(delta):
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nonlocal x
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v = x
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x = (x + delta) % len(ring)
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return ring[x]
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return nav
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nav = navigator()
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# This screen overlays BaseScreen.
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class StackScreen(Screen):
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def __init__(self):
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super().__init__()
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Label(wri, 2, 2, "Stacked screen.")
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fwdbutton(wri, 40, 2, RingScreen, args=(0,))
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CloseButton(wri)
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class BaseScreen(Screen):
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def __init__(self):
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super().__init__()
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Label(wri, 2, 2, "Base screen.")
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fwdbutton(wri, 40, 2, StackScreen)
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CloseButton(wri)
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s = """
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Demo of screen replace. Screen hierarchy:
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Base Screen
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Stacked Screen
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<- Ring Screen 0 <-> Ring Screen 1 <-> Ring Screen 2 ->
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"""
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def test():
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print(s)
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Screen.change(BaseScreen) # Pass class, not instance!
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test()
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