Remove invalid parameters for InputDecoration.collapsed

What changed?

`InputDecoration.collapsed` invalid parameters `floatingLabelBehavior` and `floatingLabelAlignment` are deprecated.

Will this affect my application?

Who is affected: Any code still referencing the removed API will fail to compile after upgrading. Code that uses InputDecoration.collapsed, InputDecoration.floatingLabelAlignment, InputDecoration.floatingLabelBehavior.
Practical impact: Compile errors until migrated; must be addressed before upgrading.
What action should I take?: Follow the official migration guide below, update affected call sites, run `dart fix --apply` where a fix is available, then run your tests.

APIs mentioned:InputDecoration.collapsed InputDecoration.floatingLabelAlignment InputDecoration.floatingLabelBehavior

How do I migrate safely?

Before and after (from the official guide)

dart+0−2

Before

1		InputDecoration.collapsed(
2		hintText: 'Hint',
3	−	floatingLabelAlignment: FloatingLabelAlignment.center,
4	−	floatingLabelBehavior: FloatingLabelBehavior.auto,
5		),

After

1		InputDecoration.collapsed(
2		hintText: 'Hint',


3		),

Raw before / after

InputDecoration.collapsed(
  hintText: 'Hint',
  floatingLabelAlignment: FloatingLabelAlignment.center,
  floatingLabelBehavior: FloatingLabelBehavior.auto,
),

InputDecoration.collapsed(
  hintText: 'Hint',
),

Official migration guide (excerpt, © The Flutter Authors, CC BY 3.0)

To migrate, remove usage of floatingLabelBehavior and floatingLabelAlignment parameters when calling the InputDecoration.collapsed constructor. Those parameters had no effect.

Code before migration:

InputDecoration.collapsed(
  hintText: 'Hint',
  floatingLabelAlignment: FloatingLabelAlignment.center,
  floatingLabelBehavior: FloatingLabelBehavior.auto,
),

Code after migration:

InputDecoration.collapsed(
  hintText: 'Hint',
),

Migration assistantAI-generated · grounded in cited sources

AI explanations are not configured

Set AI_PROVIDER (for example to openai-compatible with a local Ollama or LM Studio endpoint) to enable grounded explanations. Everything else on this page works without an AI provider.

Evidence & verification

Official migration guide·Verified classification (90%)

Listed in the official breaking-changes index; title states removal.

An official announcement or migration guide documents an intended behaviour or API change. A verified source change (git diff) shows code changed but does not by itself prove a public API is breaking. AI interpretations are labelled and never used to classify a change.

Validation warnings

api-symbols: {"reason":"no referenced symbol found in the current API index","unresolved":["InputDecoration.collapsed","InputDecoration.floatingLabelAlignment","InputDecoration.floatingLabelBehavior"]}

Source commit: b3045439b7c0
Source last updated: Oct 21, 2026
Last synchronized: Oct 21, 2026
Publication status: published

Publication history

Oct 21, 2026, 8:31 PM: new → published (ingestion) — Backed by an official breaking-change/migration guide.

AI explanationAI-generated · grounded in cited sources

AI explanations are not configured

Set AI_PROVIDER (for example to openai-compatible with a local Ollama or LM Studio endpoint) to enable grounded explanations. Everything else on this page works without an AI provider.

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