mirror of
https://github.com/Textualize/textual.git
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107 lines
2.5 KiB
Python
107 lines
2.5 KiB
Python
from __future__ import annotations
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from textual.app import App, ComposeResult
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from textual.containers import Container
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from textual.messages import Message
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from textual.reactive import reactive
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from textual.widget import Widget
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from textual.widgets import Input, Label, Switch
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class BitSwitch(Widget):
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"""A Switch with a numeric label above it."""
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DEFAULT_CSS = """
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BitSwitch {
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layout: vertical;
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width: auto;
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height: auto;
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}
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BitSwitch > Label {
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text-align: center;
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width: 100%;
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}
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"""
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class BitChanged(Message):
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"""Sent when the 'bit' changes."""
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def __init__(self, bit: int, value: bool) -> None:
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super().__init__()
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self.bit = bit
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self.value = value
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value = reactive(0) # (1)!
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def __init__(self, bit: int) -> None:
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self.bit = bit
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super().__init__()
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def compose(self) -> ComposeResult:
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yield Label(str(self.bit))
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yield Switch()
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def on_switch_changed(self, event: Switch.Changed) -> None: # (2)!
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"""When the switch changes, notify the parent via a message."""
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event.stop() # (3)!
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self.value = event.value # (4)!
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self.post_message(self.BitChanged(self.bit, event.value))
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class ByteInput(Widget):
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"""A compound widget with 8 switches."""
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DEFAULT_CSS = """
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ByteInput {
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width: auto;
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height: auto;
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border: blank;
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layout: horizontal;
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}
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ByteInput:focus-within {
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border: heavy $secondary;
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}
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"""
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def compose(self) -> ComposeResult:
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for bit in reversed(range(8)):
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yield BitSwitch(bit)
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class ByteEditor(Widget):
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DEFAULT_CSS = """
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ByteEditor > Container {
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height: 1fr;
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align: center middle;
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}
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ByteEditor > Container.top {
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background: $boost;
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}
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ByteEditor Input {
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width: 16;
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}
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"""
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def compose(self) -> ComposeResult:
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with Container(classes="top"):
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yield Input(placeholder="byte")
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with Container():
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yield ByteInput()
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def on_bit_switch_bit_changed(self, event: BitSwitch.BitChanged) -> None:
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"""When a switch changes, update the value."""
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value = 0
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for switch in self.query(BitSwitch):
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value |= switch.value << switch.bit
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self.query_one(Input).value = str(value)
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class ByteInputApp(App):
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def compose(self) -> ComposeResult:
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yield ByteEditor()
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if __name__ == "__main__":
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app = ByteInputApp()
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app.run()
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