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Merged
mcollovati merged 3 commits into from
Jan 13, 2026
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feat: Style change sample #5037

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ce70b25
feat: Style change sample
caalador Dec 30, 2025
35be748
Update articles/styling/advanced/dynamic-stylesheets.adoc
caalador Jan 7, 2026
8555da0
Merge branch 'main' into issues/5009-change-style-sample
mcollovati Jan 13, 2026
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54 changes: 54 additions & 0 deletions articles/styling/advanced/dynamic-stylesheets.adoc
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Expand Up @@ -34,4 +34,58 @@
registration.remove();
----

Using the dynamic loading and the registration it is possible to have swappable style functionality.

Check failure on line 37 in articles/styling/advanced/dynamic-stylesheets.adoc

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[vale] reported by reviewdog 🐶
[Vale.Spelling] Did you really mean 'swappable'?

Raw Output:
{"message": "[Vale.Spelling] Did you really mean 'swappable'?", "location": {"path": "articles/styling/advanced/dynamic-stylesheets.adoc", "range": {"start": {"line": 37, "column": 71}}}, "severity": "ERROR"}

This can be used, for example, in a [classname]`StyleChanger` component to update the current style based on the user’s selection.

Sample code defines the styles `default`, `color vision deficiency` and `compact`, for which the actual style files would be located in `src/main/resources/META-INF/resources/`

[source,java]
----
public class ThemeChanger extends Select<String> {
public ThemeChanger() {
setLabel("Select Theme");
setItems("default-style.css", "cvd-style.css", "compact-style.css");
setValue("default-style.css");

addValueChangeListener(event -> switchTheme(
event.getSource().getUI().orElse(UI.getCurrent()),
event.getValue()));
}

@Override
protected void onAttach(AttachEvent attachEvent) {
UI ui = attachEvent.getUI();
Registration registration = ComponentUtil.getData(ui,
Registration.class);
// set default-style if no registration found
if (registration != null) {
switchTheme(ui, "default-style.css");
}
}

/**
* Switch the current theme style sheet for a new one.
*
* @param ui the ui in use, not {@code null}
* @param styleSheet new style to replace current with
*/
protected void switchTheme(UI ui, String styleSheet) {
// Get previous style registration
Registration registration = ComponentUtil.getData(ui,
Registration.class);
// If previous available remove style sheet
if (registration != null) {
registration.remove();
}

// Add the new style sheet
registration = ui.getPage().addStyleSheet(styleSheet);

// Store registration to remove style on later change
ComponentUtil.setData(ui, Registration.class, registration);
}
}
----

[discussion-id]`6c72d9f9-16d5-4ab5-add8-3c481c3103f8`