Disabled widgets prevent mouse scrolling

[xavierog]

Context

My application used to disable entire Collapsible Contents, which is how I noticed this issue in the first place.

Notes:

• in this issue, "scrolling" and "scroll using the mouse" are both short for "scrolling using the mouse scroll wheel or any similar device"
• this issue is similar to Disabled widgets should still scroll #1912 but applies to enabled containers.

Expectations

When an enabled scrollable container contains disabled widgets, disabled widgets should not prevent scrolling the container.

Current behaviour

The MRE below reflects the issue. It alternates enabled and disabled widgets in a way that prevents effective scrolling.

#!/usr/bin/env python3
from textual.app import App, ComposeResult
from textual.widgets import Static

class MyBoringWidget(Static, can_focus=True):
    DEFAULT_CSS = "MyBoringWidget { height: 90%; background: $primary; border: tall yellow; }"

class ScrollMRE(App):
    DEFAULT_CSS = "Static { text-align: center; }"
    def compose(self) -> ComposeResult:
        instructions = 'Place your cursor in the middle of the app and try scrolling to the bottom using the mouse'
        yield Static(instructions)
        for i in range(10):
            yield MyBoringWidget(disabled=bool(i%2))
            yield Static(instructions)

if __name__ == "__main__":
    app = ScrollMRE()
    app.run()

Textual Diagnostics

Versions

Name	Value
Textual	0.52.1
Rich	13.7.0

Python

Name	Value
Version	3.11.8
Implementation	CPython
Compiler	GCC 13.2.0
Executable	~/whatever/venv/bin/python3

Operating System

Name	Value
System	Linux
Release	6.6.15-amd64
Version	#1 SMP PREEMPT_DYNAMIC Debian 6.6.15-2 (2024-02-04)

Terminal

Name	Value
Terminal Application	tmux (3.4)
TERM	xterm-256color
COLORTERM	truecolor
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=232, height=54
legacy_windows	False
min_width	1
max_width	232
is_terminal	False
encoding	utf-8
max_height	54
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None

[github-actions]

We found the following entries in the FAQ which you may find helpful:

• How do I center a widget in a screen?
• Does Textual support images?
• How do I fix WorkerDeclarationError?

Feel free to close this issue if you found an answer in the FAQ. Otherwise, please give us a little time to review.

This is an automated reply, generated by FAQtory

[willmcgugan]

Scrolling with the scrollbar works. This issue relates to scrolling with the wheel / gestures.

[github-actions]

Don't forget to star the repository!

Follow @textualizeio for Textual updates.

[xavierog]

Now that the fix is available in main, I confirm the issue no longer happens on my side (tested with both the MRE and my application). Thanks for your work.