The dot line appeared entire control for the checkbox/radiobutton when setting the Appearance as ToggleSwitch in Net11

[Zheng-Li01]

.NET version

.NET 11.0.100-rc.1.26411.119

Did it work in .NET Framework?

Not tested/verified

Did it work in any of the earlier releases of .NET Core or .NET 5+?

Not support, new feature of #14792

Issue description

The dot line appeared entire control for the checkbox/radiobutton when setting the Appearance as ToggleSwitch in Net11
Appearance as ToggleSwitch

Appearance as Normal

Steps to reproduce

1. Extracted the attached application, then build & run the project
   WinFormsApp179.zip
2. Using the Tab go though the CheckBox/RadioButton controls
3. Observe the dot line for CheckBox/RadioButton controls

[KlausLoeffelmann]

I am wondering, if we should use rounded, solid rectangles instead of the dash-lines.

[LeafShi1]

I am wondering, if we should use rounded, solid rectangles instead of the dash-lines.

I've been thinking about the different options here:

1. We could focus only the text area, similar to the Classic behavior. That would avoid the large focus rectangle issue, but the ToggleSwitch itself is much more visually prominent than a traditional checkbox or radio button. If the focus indicator appears only around the text, the switch and the text may start to feel like two separate elements.

2. We could follow the Windows visual style and focus only the switch part. However, that might introduce other concerns, since the switch and its text still represent a single WinForms control from both an interaction and accessibility perspective.

3. We could keep focusing the entire control and use a rounded solid border. My concern there is that, for long or multiline labels, the border could become quite dominant and start looking more like a card or panel border rather than a focus indicator.

Because of that, I'm wondering whether a rounded dashed border could be a reasonable compromise. It would keep the current focus semantics, provide a more modern appearance than the traditional rectangular dash lines, and still visually read as a focus cue rather than an actual control border.

What do you think?

[KlausLoeffelmann]

I am afraid, many folks could not see a dotted dash-line on a 4K Monitor anymore. Hmm.

Take a look. Honestly, I like it. We are already focusing the Button in the same style. I would do the same thing for the every other control, we're N11-styling. The important thing is: We need to reserve the Padding for it from the beginning. The control cannot grow in size, just because it became focused.

What do you think?

[LeafShi1]

I am afraid, many folks could not see a dotted dash-line on a 4K Monitor anymore. Hmm.
...
What do you think?

That makes sense. I agree consistency with the Button focus style is probably the better direction.

I'll prototype a rounded solid focus border around the entire control and make sure the required padding is reserved up front so the control size doesn't change when focus is received.

I'll put together a PR first so we can evaluate the visual result.