Building upon this, but adding #line selector:
from textual import on
from textual.app import App, ComposeResult
from textual.widgets import Header, Select
LINES = """I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.""".splitlines()
class SelectApp(App):
def compose(self) -> ComposeResult:
yield Header()
yield Select(((line, line) for line in LINES), id="line")
@on(Select.Changed, "#line")
def select_changed(self, event: Select.Changed) -> None:
self.title = str(event.value)
if __name__ == "__main__":
app = SelectApp()
app.run()Causes:
Traceback (most recent call last):
File "/home/dave/ng/textual-select-on.py", line 12, in <module>
class SelectApp(App):
File "/home/dave/ng/textual-select-on.py", line 17, in SelectApp
@on(Select.Changed, "#line")
File "/home/dave/.pyenv/versions/ng/lib/python3.10/site-packages/textual/_on.py", line 69, in on
raise OnDecoratorError(
textual._on.OnDecoratorError: The message class must have a 'control' to match with the on decorator
Textual Diagnostics
Versions
| Name |
Value |
| Textual |
0.26.0 |
| Rich |
13.3.3 |
Python
| Name |
Value |
| Version |
3.10.9 |
| Implementation |
CPython |
| Compiler |
GCC 9.4.0 |
| Executable |
/home/dave/.pyenv/versions/3.10.9/envs/ng/bin/python3.10 |
Operating System
| Name |
Value |
| System |
Linux |
| Release |
5.14.0-1059-oem |
| Version |
#67-Ubuntu SMP Mon Mar 13 14:22:10 UTC 2023 |
Terminal
| Name |
Value |
| Terminal Application |
vscode (1.78.2) |
| TERM |
xterm-256color |
| COLORTERM |
truecolor |
| FORCE_COLOR |
Not set |
| NO_COLOR |
Not set |
Rich Console options
| Name |
Value |
| size |
width=95, height=59 |
| legacy_windows |
False |
| min_width |
1 |
| max_width |
95 |
| is_terminal |
True |
| encoding |
utf-8 |
| max_height |
59 |
| justify |
None |
| overflow |
None |
| no_wrap |
False |
| highlight |
None |
| markup |
None |
| height |
None |
