Contents
description bug_report

Deprecated API removed after v3.3

Contents

Summary

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In accordance with Flutter's Deprecation Policy, deprecated APIs that reached end of life after the 3.3 stable release have been removed.

All affected APIs have been compiled into this primary source to aid in migration. A quick reference sheet is available as well.

Changes

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This section lists the deprecations, listed by the affected class.

RenderUnconstrainedBox

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Supported by Flutter Fix: no

RenderUnconstrainedBox was deprecated in v2.1. Use RenderConstraintsTransformBox instead.

Where unconstrained in both axes, provide ConstraintsTransformBox.unconstrained to constraintsTransform.

If RenderUnconstrainedBox.constrainedAxis was previously set, replace respectively:

  • Where constrainedAxis was previously Axis.horizontal, set constraintsTransform to ConstraintsTransformBox.widthUnconstrained.
  • Where constrainedAxis was previously Axis.vertical, set constraintsTransform to ConstraintsTransformBox.heightUnconstrained.

This change allowed for the introduction of several more types of constraint transformations through ConstraintsTransformBox. Other parameters of the old API are compatible with the new API.

Migration guide

Code before migration:

dart
// Unconstrained
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
  textDirection: TextDirection.ltr,
  child: RenderConstrainedBox(
    additionalConstraints: const BoxConstraints.tightFor(height: 200.0),
  ),
  alignment: Alignment.center,
);

// Constrained in horizontal axis
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
  constrainedAxis: Axis.horizontal,
  textDirection: TextDirection.ltr,
  child: RenderConstrainedBox(
    additionalConstraints: const BoxConstraints.tightFor(width: 200.0, height: 200.0),
  ),
  alignment: Alignment.center,
);

// Constrained in vertical axis
final RenderUnconstrainedBox unconstrained = RenderUnconstrainedBox(
  constrainedAxis: Axis.vertical,
  textDirection: TextDirection.ltr,
  child: RenderFlex(
    direction: Axis.vertical,
    textDirection: TextDirection.ltr,
    children: <RenderBox>[flexible],
  ),
  alignment: Alignment.center,
);

Code after migration:

dart
// Unconstrained
final RenderConstraintsTransformBox unconstrained = RenderConstraintsTransformBox(
  constraintsTransform: ConstraintsTransformBox.unconstrained,
  textDirection: TextDirection.ltr,
  child: RenderConstrainedBox(
    additionalConstraints: const BoxConstraints.tightFor(height: 200.0),
  ),
  alignment: Alignment.center,
);

// Constrained in horizontal axis
final RenderConstraintsTransformBox unconstrained = RenderConstraintsTransformBox(
  constraintsTransform: ConstraintsTransformBox.widthUnconstrained,
  textDirection: TextDirection.ltr,
  child: RenderConstrainedBox(
    additionalConstraints: const BoxConstraints.tightFor(width: 200.0, height: 200.0),
  ),
  alignment: Alignment.center,
);

// Constrained in vertical axis
final RenderConstraintsTransformBox unconstrained = RenderConstraintsTransformBox(
  constraintsTransform: ConstraintsTransformBox.widthUnconstrained,
  textDirection: TextDirection.ltr,
  child: RenderFlex(
    direction: Axis.vertical,
    textDirection: TextDirection.ltr,
    children: <RenderBox>[flexible],
  ),
  alignment: Alignment.center,
);

References

API documentation:

Relevant PRs:

DragAnchor, Draggable.dragAnchor & LongPressDraggable.dragAnchor

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Supported by Flutter Fix: yes

The enum DragAnchor, and its uses in Draggable.dragAnchor & LongPressDraggable.dragAnchor were deprecated in v2.1. Use dragAnchorStrategy instead.

This change allowed for more accurate feedback of the draggable widget when used in conjunction with other widgets like Stack and InteractiveViewer.

Migration guide

Code before migration:

dart
Draggable draggable = Draggable();
draggable = Draggable(dragAnchor: DragAnchor.child);
draggable = Draggable(dragAnchor: DragAnchor.pointer);

LongPressDraggable longPressDraggable = LongPressDraggable();
longPressDraggable = LongPressDraggable(dragAnchor: DragAnchor.child);
longPressDraggable = LongPressDraggable(dragAnchor: DragAnchor.pointer);

Code after migration:

dart
Draggable draggable = Draggable();
draggable = Draggable(dragAnchorStrategy: childDragAnchorStrategy);
draggable = Draggable(dragAnchorStrategy: pointerDragAnchorStrategy);

LongPressDraggable longPressDraggable = LongPressDraggable();
longPressDraggable = LongPressDraggable(dragAnchorStrategy: childDragAnchorStrategy);
longPressDraggable = LongPressDraggable(dragAnchorStrategy: pointerDragAnchorStrategy);

References

API documentation:

Relevant issues:

Relevant PRs:

ScrollBehavior.buildViewportChrome

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Supported by Flutter Fix: yes

The method ScrollBehavior.buildViewportChrome was deprecated in v2.1.

This method was used by the Scrollable widget to apply an overscroll indicator, like GlowingOverscrollIndicator, by default on the appropriate platforms. As more default decorators have been added, like Scrollbars, each has instead been split into individual methods to replace buildViewportChrome.

This allows extending classes to only override the specific decorator, through buildScrollbar or buildOverscrollIndicator, rather than needing to rewrite code in order to maintain one or the other.

Migration guide

In-depth migration guide available

Code before migration:

dart
final ScrollBehavior scrollBehavior = ScrollBehavior();
scrollBehavior.buildViewportChrome(context, child, axisDirection);

Code after migration:

dart
final ScrollBehavior scrollBehavior = ScrollBehavior();
scrollBehavior.buildOverscrollIndicator(context, child, axisDirection);

References

Design document:

API documentation:

Relevant issues:

Relevant PRs:

Timeline

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In stable release: 3.7