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feat!: rebuild on top of the core Switch - #8
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WalkthroughThe 2.0 snapshot uses Vaadin 25.3 and Java 21. ChangesToggleButton 2.0
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
Docstring coverage is 21.18% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 85 functions across 11 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Issue #7asks for a major version that delegates to Vaadin Switch, preserves the API where possible, and retains missing add-on features.ToggleButtonextendsAbstractField, wraps a coreSwitch,…Out of Scope Changes check The Vaadin and Java build updates support the Vaadin 25.3 Switch migration in issue #7. The README, demo, and tests document or verify the rebuilt component and its features. The reviewed changes show…Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely identifies the primary change: rebuilding the ToggleButton on top of Vaadin's core Switch. Full details: Linked Issues check
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Explanation
Issue
#7asks for a major version that delegates to Vaadin Switch, preserves the API where possible, and retains missing add-on features.ToggleButtonextendsAbstractField, wraps a coreSwitch, and retains side labels, icons, variants, and label highlighting. It adds helper and validation support. The documentedHasComponentsremoval prevents callers from altering the component’s internal structure. The tests cover accessible naming, Binder validation, and switch behavior.
Full details: Out of Scope Changes check
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Explanation
The Vaadin and Java build updates support the Vaadin 25.3 Switch migration in issue
#7. The README, demo, and tests document or verify the rebuilt component and its features. The reviewed changes show no unrelated work.
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@src/main/java/com/flowingcode/vaadin/addons/togglebutton/ToggleButton.java:
- Around line 196-199: Store the value passed to ToggleButton.setAriaLabelledBy
and route the setter through updateAccessibleName; make updateAccessibleName
preserve a nonblank caller-provided aria-labelledby value ahead of computed
label IDs, while retaining the existing behavior when no value is set.
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📒 Files selected for processing (15)
.github/workflows/maven.ymlREADME.mdpom.xmlsrc/main/java/com/flowingcode/vaadin/addons/togglebutton/ToggleButton.javasrc/main/java/com/flowingcode/vaadin/addons/togglebutton/ToggleButtonVariant.javasrc/main/resources/META-INF/frontend/fc-toggle-button.jssrc/main/resources/META-INF/frontend/styles/fc-toggle-button.csssrc/main/resources/META-INF/resources/frontend/fc-toggle-button.jssrc/test/java/com/flowingcode/vaadin/addons/togglebutton/ToggleButtonDemoView.javasrc/test/java/com/flowingcode/vaadin/addons/togglebutton/ToggleButtonFormDemo.javasrc/test/java/com/flowingcode/vaadin/addons/togglebutton/it/AbstractViewTest.javasrc/test/java/com/flowingcode/vaadin/addons/togglebutton/it/ToggleButtonIT.javasrc/test/java/com/flowingcode/vaadin/addons/togglebutton/it/ToggleButtonVariantsIT.javasrc/test/java/com/flowingcode/vaadin/addons/togglebutton/it/ViewIT.javasrc/test/java/com/flowingcode/vaadin/addons/togglebutton/test/BinderThemeTest.java
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- src/main/resources/META-INF/resources/frontend/fc-toggle-button.js
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Requesting changes for the inline comments above. The Vaadin 25 bind* and focus(FocusOption...) default methods act on the host element instead of the inner Switch, so they need overrides. The MEDIUM Javadoc also needs updating.
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Please verify the styles for disabled and readonly states (#2)
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@javier-godoy I checked both states against #2, and I think they already match what we agreed there:
If something else looks wrong (a specific theme, dark mode, or a case not in the demo), could you share the case? I'll take a look. |
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@javier-godoy Based on #4, I changed the read-only border tint to match it: 40% of the variant color mixed with |
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Disabled still ignores color variants
What 1.x actually does
1.x does not ignore color variants when disabled.
The only rule for the disabled state in fc-toggle-button.js is:
None of the variant rules exclude [disabled]:
The only rules that check :not([disabled]) are the two hover filter: brightness(...) rules.
So in 1.x, a checked, disabled success toggle has a green track at 50% opacity, and its active label is green text at 50% opacity. error is red, warning is yellow, contrast is dark, each at half opacity. The variant is kept and faded, not ignored. Disabling a toggle never changes its hue, only its opacity.
What we agreed in #2
In #2 the justification did say that ignoring color variants for disabled components is Vaadin's behavior. But what was decided was:
▎ Disabled state it's okay as it is. ✔
"As it is" meant the disabled state as it existed at that point, which is the 1.x behavior above: variant kept, faded by opacity: 0.5. The only change #2 agreed to was for read-only (transparent background, base border, desaturated variant). Nothing was decided about changing the disabled state, and nothing in 1.x was changed after #2 to make disabled toggles ignore their variant. A comment explaining why the current behavior is fine can't be read later as agreement to a different behavior.
So "in #2 we agreed that this is fine" covers the 1.x rendering, not the one in this PR.
What this PR does
In fc-toggle-button.css
fc-toggle-button:is([theme~='color-primary'], [theme~='color-success'], [theme~='color-error'], [theme~='color-warning'], [theme~='color-contrast'])
> .fc-toggle-button-row > vaadin-switch[checked]:not([readonly], [disabled]) {
--vaadin-switch-background: var(--_toggle-button-variant-color);
--vaadin-switch-icon-color: var(--_toggle-button-variant-color);
}
When the switch is disabled, none of our variables are set and vaadin-switch falls back to its own theme styles. Those don't produce a neutral "variant ignored" look either. For a checked disabled switch, both themes tint the track with the primary/accent color:
- Lumo (vaadin-lumo-styles/src/components/switch.css):
:host([disabled][checked]) {
--vaadin-switch-background: var(--lumo-primary-color-10pct);
--vaadin-switch-icon-color: color-mix(in srgb, var(--lumo-primary-color) 10%, var(--lumo-base-color) 50%);
}
- Aura (aura/src/components/switch.css):
&[disabled] {
&[checked] {
--vaadin-switch-background: color-mix(in srgb, var(--aura-accent-color) 20%, transparent);
}
}
So with this PR, a checked, disabled color-error toggle doesn't render gray: it renders a faint blue (primary/accent) track. Same for color-success, color-warning and color-contrast. The variant is replaced by primary, which is not "ignored" and not "Gray = Inactive". A disabled error toggle looking like a faded primary toggle arguably says something wrong about the data. That was the very concern in #2 (the variant communicates what the value means).
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@javier-godoy You're right, I misread #2: I checked it with an unchecked disabled toggle, where the variant color never shows. Checked disabled toggles now keep the variant color, faded, as in 1.x (22dd6d0). I also added the disabled color variants to the demo, since that case wasn't there. |
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@paodb Please squash WIPs |
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@javier-godoy I squashed the WIP commits into |
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Summary
Version 2.0 of the add-on, rebuilt on top of the core Vaadin Switch introduced in Vaadin 25.3. It requires Vaadin 25.3+ and Java 21. Version 1.x stays in maintenance for Vaadin 24 and 25.0–25.2.
Why
With Switch in core, the add-on only makes sense for what core doesn't offer. Instead of maintaining our own switch, the add-on now delegates the switch itself to Switch (value, keyboard, focus, ARIA role and state, read-only, disabled, RTL, forced colors) and keeps its differentiators on top: side labels and icons, label highlighting, color and size variants, long swipe, and touch swipe.
This fixes the accessibility gaps of 1.x: the toggle is now announced as a switch with its on/off state, is focusable, and works with the Space key.
Changes
Component
ToggleButtonextendsAbstractField<ToggleButton, Boolean>and wraps aSwitch. The fluent API and the value change event type (ComponentValueChangeEvent<ToggleButton, Boolean>) are unchanged.aria-labelledby/aria-describedby.fc-toggle-button.jsis now a small custom element without shadow DOM that only handles clicks on labels/icons and touch swipe. All styling lives instyles/fc-toggle-button.css, using only the public--vaadin-switch-*properties.Bindervalidation (HasHelper,HasValidationProperties,Focusable).Build
v25profile is removed and CI runs a single Java 21 job.META-INF/resources/frontend/toMETA-INF/frontend/.vaadin-maven-pluginstill defaultsfrontendResourcesDirectoryto the old location (as of 25.3.1), so it is now configured explicitly; without it, the production build can't find the module. Thedemo-warstep that moved files back to the old location was removed.Tests and demo
togglebutton/labels,togglebutton/variants,togglebutton), plus a new test for the switch role and accessible name.BinderThemeTestcovers the theme collision described below.Binder, color variants withBinder, and swipe.Breaking changes
See "Migrating from 1.x" in the README. In short:
HasComponents; usesetLeftIcon/setRightIcon. The component now manages its own children (the inner switch, labels, helper and error message), so a publicadd()/remove()/removeAll()would let callers break that structure, for example removing the switch itself. In 1.x it was only used internally to attach the icons.MEDIUM).Read-only and disabled use the core Switch look (solid border instead of dashed). A checked read-only toggle with a color variant keeps the variant color as a border tint.Read-only and disabled use the core Switch look (in read-only, a solid border instead of dashed). Color variants are kept as in 1.x: a checked read-only toggle shows a desaturated variant color on the border, and a checked disabled toggle a faded variant color on the track.aria-describedby, so screen readers announce it. A tooltip on the whole component would also open over the side labels, but would lose both.color-primary,color-success,color-warning,color-errorandcolor-contrastto thethemeattribute. TheToggleButtonVariantconstants are unchanged; only custom CSS targeting the attribute is affected.Notes for reviewers
Binder: since Flow 24.9.2,Binder'sDefaultBinderValidationErrorHandleradds a theme named after the error level (error,warning, ...) to any field, and removes all of them when the field is valid. With the old variant names, a toggle withERRORorWARNINGbound withBinderlost its color as soon assetBean()validated it. This also affects the released 1.x on Vaadin 24.9.2+, so a 1.x fix may be worth considering.Close #7
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