AutoCompleteTagEditor

A versatile Flutter tag input widget with autocomplete suggestions, custom tag creation capabilities, and smooth animations.

Features

• 🏷️ Generic Type Support - Works with String or any custom object type
• 🔍 Smart Autocomplete - Filter suggestions as you type
• ✨ Custom Tag Creation - Allow new tags not in suggestions
• 📱 Responsive Layout - Automatic line wrapping for tags
• 🎨 Customizable UI - Match your app's theme
• 🧩 Overlay Suggestions - Position-aware dropdown list
• ✅ Validation Support - Built-in input validation
• ⚡ Performance - Efficient filtering and rendering

Installation

Add to your pubspec.yaml:

dependencies:
  autocomplete_tag_editor: ^1.0.6

Basic Usage

String Tags with Customization

AutoCompleteTagEditor<String>(
  suggestions: ['Flutter', 'Dart', 'Firebase'],
  value: const ['Flutter'],
  displayValueBuilder: (option) => option,
  allowCustomTags: true,
  onTagsChanged: (tags) => print('Selected tags: $tags'),
  inputDecoration: InputDecoration(
    labelText: 'Add Tags',
    border: OutlineInputBorder(),
  ),
)

Custom Type Tags

class TagData {
  final String id;
  final String name;

  TagData(this.id, this.name);
}

AutoCompleteTagEditor<TagData>(
  suggestions: [
    TagData('1', 'Mobile'),
    TagData('2', 'Web'),
  ],
  value: const [],
  displayValueBuilder: (option) => option.name,
  allowCustomTags: true,
  onCreateCustomTag: (input) => TagData(Uuid().v4(), input),
)

Advance Usage

Custom Tag Design

AutoCompleteTagEditor<String>(
  tagBuilder: (context, tag, onDeleted) => Container(
    padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
    decoration: BoxDecoration(
      color: Colors.blue[100],
      borderRadius: BorderRadius.circular(16),
    ),
    child: Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        Text(tag),
        IconButton(
          icon: const Icon(Icons.close, size: 16),
          onPressed: onDeleted,
        ),
      ],
    ),
  ),
)

Custom Suggestion Design

AutoCompleteTagEditor<String>(
  suggestionItemBuilder: (context, suggestion, onSelected) => Card(
    child: ListTile(
      leading: const Icon(Icons.tag),
      title: Text(suggestion),
      trailing: const Icon(Icons.add_circle),
      onTap: onSelected,
    ),
  ),
)

Custom Filter Logic

AutoCompleteTagEditor<String>(
  suggestionFilter: (suggestion, query) {
    // Implement custom filtering logic
    return suggestion.toLowerCase().startsWith(query.toLowerCase());
  },
)

Parameters

Parameter	Type	Required	Description
suggestions	List	No	Available options for autocomplete
value	List	No	Initially selected tags
displayValueBuilder	DisplayValueBuilder	Yes*	Converts T instance to display string
inputDecoration	InputDecoration	No	Decoration for the input field
textStyle	TextStyle	No	Custom text style for the input field
allowCustomTags	bool	No	Enable creation of tags not in suggestions (default: false)
onCreateCustomTag	CreateCustomTag	No	Required when using non-String types with allowCustomTags=true
onTagsChanged	ValueChanged<List>	No	Callback when tags change
tagBuilder	TagBuilder	No	Custom widget builder for tags
suggestionItemBuilder	SuggestionItemBuilder	No	Custom widget builder for suggestion items
suggestionFilter	SuggestionFilter	No	Custom filtering logic for suggestions
maxSuggestionCount	int	No	Maximum number of suggestions to show (default: 5)
minimumSpaceRequiredBelow	int	No	Minimum space needed below input to show suggestions (default: 300)
onFocusChange	ValueChanged	No	Callback when input field focus changes

What's New in 1.0.6

• 🎯 Enhanced Focus Management

  • Smart focus handling with better tap interactions
  • New onFocusChange callback to track input field focus state
  • Improved focus restoration after tag operations

• ⚡ Performance Improvements

  • Cached suggestion filtering for better performance
  • Smart overlay rebuilds to minimize unnecessary updates
  • Efficient tag state management

• 🎨 UI/UX Enhancements

  • Smoother animations for overlay transitions
  • Better keyboard interaction handling
  • Improved cursor visibility and styling
  • Dynamic overlay positioning considering keyboard visibility
  • More responsive tag operations (add/remove)

• 💪 Stability Improvements

  • Better state cleanup on widget disposal
  • More reliable focus and overlay management
  • Improved handling of widget updates

Important Notes

⚠️ Type Safety Requirements

• When using custom types (T != String) with allowCustomTags: true, you must provide onCreateCustomTag
• displayValueBuilder must be provided for custom Types

🎯 Tag Creation Behavior

• Tags can be created by typing and pressing the comma key (,)
• Tags are also created when the input field loses focus (if allowCustomTags is true)
• Duplicate tags are prevented automatically

💡 UI Considerations

• The widget uses Flutter's overlay system for suggestions
• Suggestions list automatically positions above the input if there isn't enough space below (controlled by minimumSpaceRequiredBelow)
• Input field automatically expands with content
• Maximum suggestions shown can be limited using maxSuggestionCount

🔧 State Management

• Parent widgets should manage the selected tags state if needed
• Use onTagsChanged to track tag additions/removals

Example App

See the /example directory for a complete implementation. The example demonstrates:

• String tag implementation
• Custom object type tags
• Custom styling
• Validation scenarios
• Error handling

Contributing

Contributions are welcome! Please follow these steps:

• Fork the repository
• Create your feature branch
• Commit your changes
• Push to the branch
• Create a new Pull Request