A high-performant slidable Panel that can show actions in different positions, and also can expand the action item when the panel is opening

Features

this package uses some syntax sugar of Dart 3.0, please create issues if you want to use this package in Dart 2.x, I will remove those syntax sugars and migrate it to Dart 2.x

1. When the panel is closed/dismissed, no actions would be painted and laid out.
2. The animation of actions (e.g., expanding/collapsing a specific action) will be scoped and not result in the re-layout and re-painting of the entire SlidablePanel
3. control the SlidablePanel and actions programmatically using SlideController, not limited to gestures.

All action widgets can be expanded when the SlidablePanel is opening.

Different Motions

• ActionMotion.drawer

• ActionMotion.scroll

• ActionMotion.behind

Disable gesture sliding

By setting gestureDisabled: true, you could avoid gesture sliding and continue sliding via SlideController programmatically

SlidablePanel(
  ...
  gestureDisabled: true,
  ...
)

Initial Opened Position

By specifying the initOpenedPosition of SlideController, you could open actions at the initOpenedPosition without using WidgetsBinding.instance.addPostFrameCallback.

you should ensure there are actions at the specified initOpenedPosition

  final SlideController _slideController = SlideController(
    usePreActionController: true,
    usePostActionController: true,
    initOpenedPosition: ActionPosition.pre,
  );

Getting started

import 'package:flutter/material.dart';
import 'package:flutter_slidable_panel/flutter_slidable_panel.dart';

class SizedSlidableExample extends StatefulWidget {
  const SizedSlidableExample({super.key});

  @override
  State<SizedSlidableExample> createState() => _SizedSlidableExampleState();
}

class _SizedSlidableExampleState extends State<SizedSlidableExample> {
  final SlideController _slideController = SlideController(
    usePreActionController: true,
    usePostActionController: true,
  );

  @override
  void dispose() {
    _slideController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Sized Slidable Example'),
      ),
      body: Center(
        child: SlidablePanel(
          controller: _slideController,
          maxSlideThreshold: 0.8,
          axis: Axis.horizontal,
          preActions: [
            TextButton(
              onPressed: () {
                _slideController.toggleAction(0);
              },
              style: TextButton.styleFrom(
                backgroundColor: Colors.greenAccent,
                shape: const RoundedRectangleBorder(),
              ),
              child: const Text("PreAction"),
            ),
            TextButton(
              onPressed: () {
                _slideController.toggleAction(1);
              },
              style: TextButton.styleFrom(
                backgroundColor: Colors.redAccent,
                shape: const RoundedRectangleBorder(),
              ),
              child: const Text("PreAction"),
            ),
          ],
          postActions: [
            TextButton(
              onPressed: () {
                _slideController.toggleAction(0);
              },
              style: TextButton.styleFrom(
                backgroundColor: Colors.greenAccent,
                shape: const RoundedRectangleBorder(),
              ),
              child: const Text("PostAction"),
            ),
            TextButton(
              onPressed: () {
                _slideController.toggleAction(1);
              },
              style: TextButton.styleFrom(
                backgroundColor: Colors.redAccent,
                shape: const RoundedRectangleBorder(),
              ),
              child: const Text("PostAction"),
            ),
          ],
          child: GestureDetector(
            onTap: () {
              _slideController.dismiss();
            },
            child: const DecoratedBox(
              decoration: BoxDecoration(color: Colors.blue),
              child: SizedBox(
                width: 250,
                height: 100,
                child: Center(
                  child: Text(
                    'Slide me',
                  ),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}

Usage

create a SlideController

• usePreActionController indicates if you want to enable expanding/collapsing the pre actions
• usePostActionController indicates if you want to enable expanding/collapsing the post actions.

if usePreActionController or usePostActionController is set to true, the corresponding ActionController would be created and bound to RenderSlideAction automatically

• invoking SlideController.expand/SlideController.collapse/SlideController.toggleAction only takes effects for two cases:
  1. usePreActionController is true and the current openedPosition is ActionPosition.pre
  2. usePostActionController is true and the current openedPosition is ActionPosition.post

  final SlideController _slideController = SlideController(
    usePreActionController: true,
    usePostActionController: true,
  );

use different motion and alignment at different positions

SlidablePanel.preActionLayout and SlidablePanel.postActionLayout accept ActionLayout as parameters.

1. You could determine how to layout the actions at the different positions by specifying:

   when using ActionAlignment.flex, you could give an action a specific flex value using ActionItem. Other actions not wrapped in ActionItem would have a default flex value of 1.

   ActionAlignment.spaceEvenly would ignore ActionItem

ActionLayout(
  alignment: ActionAlignment.spaceEvenly || ActionAlignment.flex,
)

2. You could also determine which motion to use:

ActionLayout(
  motion: ActionMotion.behind || ActionMotion.drawer || ActionMotion.scroll
)

Do something when starting sliding

You could set onSlideStart to do some work when starting sliding, e.g., you want to dismiss all other SlidablePanel when starting sliding.

SlidablePanel(
  /// other code
  onSlideStart: <your function>,
  /// other code
)

Use SlideController programmatically

open the panel

SlideController.open({
    ActionPosition position = ActionPosition.pre,
    Curve curve = Curves.easeInOut,
    Duration duration = const Duration(milliseconds: 300),
    VoidCallback? onOpened,
  });

dismiss the panel

SlideController.dismiss({
    Curve curve = Curves.easeInOut,
    Duration duration = const Duration(milliseconds: 300),
    VoidCallback? onDismissed,
  })

check the current opened position

SlideController.openedPosition

• opened ActionPosition.pre for horizontal and vertical

• opened ActionPosition.post for horizontal and vertical

expand the index action at the opened position

index is the index in SlidablePanel.preActions or SlidablePanel.postActions

it will try to expand the index action at the current opened position if this panel is opened;

if this panel is closed/dismissed, it has no effects

if the current opened position has no associated ActionController, it also has no effects

you could associate ActionController to a specific position by setting usePreActionController or usePostActionController as true.

SlideController.expand(
    int index, {
    Curve curve = Curves.easeInOut,
    Duration duration = const Duration(milliseconds: 150),
  })

collapse the index action at the opened position

SlideController.collapse(
    int index, {
    required ActionPosition position,
    Curve curve = Curves.easeInOut,
    Duration duration = const Duration(milliseconds: 150),
  })

toggle the index action at the opened position

SlideController.toggleAction(
    int index, {
    Curve curve = Curves.easeInOut,
    Duration duration = const Duration(milliseconds: 150),
  })

detect if the index action is expanded

bool SlideController.hasExpandedAt(int index)