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import 'dart:convert';
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import 'package:collection/collection.dart';
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import 'package:flutter/material.dart';
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import 'package:stream_chat/stream_chat.dart';
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import 'package:stream_chat_flutter_core/src/message_text_field_controller.dart';
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/// A value listenable builder related to a [Message].
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///
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/// Pass in a [MessageInputController] as the `valueListenable`.
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typedef MessageValueListenableBuilder = ValueListenableBuilder<Message>;
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/// Controller for storing and mutating a [Message] value.
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class MessageInputController extends ValueNotifier<Message> {
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/// Creates a controller for an editable text field.
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///
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/// This constructor treats a null [message] argument as if it were the empty
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/// message.
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factory MessageInputController({
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Message? message,
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Map<RegExp, TextStyle>? textPatternStyle,
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}) =>
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MessageInputController._(
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initialMessage: message ?? Message(),
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textPatternStyle: textPatternStyle,
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);
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/// Creates a controller for an editable text field from an initial [text].
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factory MessageInputController.fromText(
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String? text, {
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Map<RegExp, TextStyle>? textPatternStyle,
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}) =>
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MessageInputController._(
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initialMessage: Message(text: text),
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textPatternStyle: textPatternStyle,
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);
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/// Creates a controller for an editable text field from initial
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/// [attachments].
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factory MessageInputController.fromAttachments(
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List<Attachment> attachments, {
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Map<RegExp, TextStyle>? textPatternStyle,
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}) =>
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MessageInputController._(
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initialMessage: Message(attachments: attachments),
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textPatternStyle: textPatternStyle,
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);
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MessageInputController._({
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required Message initialMessage,
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Map<RegExp, TextStyle>? textPatternStyle,
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}) : _textEditingController = MessageTextFieldController.fromValue(
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initialMessage.text == null
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? const TextEditingValue()
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: TextEditingValue(
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text: initialMessage.text!,
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composing: TextRange.collapsed(initialMessage.text!.length),
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),
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textPatternStyle: textPatternStyle,
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),
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_initialMessage = initialMessage,
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super(initialMessage) {
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addListener(_textEditingSyncer);
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}
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void _textEditingSyncer() {
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final cleanText = value.command == null
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? value.text
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: value.text?.replaceFirst('/${value.command} ', '');
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if (cleanText != _textEditingController.text) {
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final previousOffset = _textEditingController.value.selection.start;
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final previousText = _textEditingController.text;
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final diff = (cleanText?.length ?? 0) - previousText.length;
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_textEditingController
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..text = cleanText ?? ''
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..selection = TextSelection.collapsed(
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offset: previousOffset + diff,
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);
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}
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}
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/// Returns the current message associated with this controller.
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Message get message => value;
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/// Returns the controller of the text field linked to this controller.
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MessageTextFieldController get textEditingController =>
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_textEditingController;
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final MessageTextFieldController _textEditingController;
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/// Returns the text of the message.
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String get text => _textEditingController.text;
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Message _initialMessage;
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/// Sets the message.
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set message(Message message) {
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value = message;
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}
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/// Sets the message that's being quoted.
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set quotedMessage(Message message) {
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value = value.copyWith(
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quotedMessage: message,
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quotedMessageId: message.id,
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);
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}
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/// Clears the quoted message.
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void clearQuotedMessage() {
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value = value.copyWith(
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quotedMessageId: null,
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quotedMessage: null,
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);
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}
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/// Sets a command for the message.
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set command(Command command) {
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value = value.copyWith(
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command: command.name,
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text: '/${command.name} ',
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);
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}
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/// Sets the text of the message.
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set text(String newText) {
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var newTextWithCommand = newText;
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if (value.command != null) {
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if (!newText.startsWith('/${value.command}')) {
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newTextWithCommand = '/${value.command} $newText';
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}
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}
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value = value.copyWith(text: newTextWithCommand);
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}
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/// Returns the baseOffset of the text field.
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int get baseOffset => textEditingController.selection.baseOffset;
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/// Returns the start of the selection of the text field.
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int get selectionStart => textEditingController.selection.start;
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/// Sets the [showInChannel] flag of the message.
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set showInChannel(bool newValue) {
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value = value.copyWith(showInChannel: newValue);
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}
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/// Returns true if the message is in a thread and
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/// should be shown in the main channel as well.
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bool get showInChannel => value.showInChannel ?? false;
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/// Returns the attachments of the message.
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List<Attachment> get attachments => value.attachments;
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/// Sets the list of [attachments] for the message.
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set attachments(List<Attachment> attachments) {
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value = value.copyWith(attachments: attachments);
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}
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/// Adds a new attachment to the message.
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void addAttachment(Attachment attachment) {
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attachments = [...attachments, attachment];
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}
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/// Adds a new attachment at the specified [index].
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void addAttachmentAt(int index, Attachment attachment) {
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attachments = [...attachments]..insert(index, attachment);
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}
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/// Removes the specified [attachment] from the message.
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void removeAttachment(Attachment attachment) {
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attachments = [...attachments]..remove(attachment);
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}
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/// Remove the attachment with the given [attachmentId].
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void removeAttachmentById(String attachmentId) {
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attachments = [...attachments]..removeWhere((it) => it.id == attachmentId);
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}
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/// Removes the attachment at the given [index].
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void removeAttachmentAt(int index) {
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attachments = [...attachments]..removeAt(index);
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}
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/// Clears the message attachments.
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void clearAttachments() {
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attachments = [];
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}
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// Only used to store the value locally in order to remove it if we call
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// [clearOGAttachment] or [setOGAttachment] again.
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Attachment? _ogAttachment;
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/// Returns the og attachment of the message if set
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Attachment? get ogAttachment =>
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attachments.firstWhereOrNull((it) => it.id == _ogAttachment?.id);
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/// Sets the og attachment in the message.
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void setOGAttachment(Attachment attachment) {
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attachments = [...attachments]
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..remove(_ogAttachment)
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..insert(0, attachment);
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_ogAttachment = attachment;
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}
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/// Removes the og attachment.
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void clearOGAttachment() {
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if (_ogAttachment != null) {
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removeAttachment(_ogAttachment!);
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}
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_ogAttachment = null;
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}
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/// Returns the list of mentioned users in the message.
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List<User> get mentionedUsers => value.mentionedUsers;
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/// Sets the mentioned users.
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set mentionedUsers(List<User> users) {
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value = value.copyWith(mentionedUsers: users);
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}
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/// Adds a user to the list of mentioned users.
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void addMentionedUser(User user) {
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mentionedUsers = [...mentionedUsers, user];
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}
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/// Removes the specified [user] from the mentioned users list.
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void removeMentionedUser(User user) {
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mentionedUsers = [...mentionedUsers]..remove(user);
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}
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/// Removes the mentioned user with the given [userId].
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void removeMentionedUserById(String userId) {
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mentionedUsers = [...mentionedUsers]..removeWhere((it) => it.id == userId);
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}
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/// Removes all mentioned users from the message.
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void clearMentionedUsers() {
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mentionedUsers = [];
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}
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/// Sets the [message], or [value], to empty.
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///
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/// After calling this function, [text], [attachments] and [mentionedUsers]
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/// will all be empty.
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///
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/// Calling this will notify all the listeners of this
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/// [MessageInputController] that they need to update
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/// (calls [notifyListeners]). For this reason,
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/// this method should only be called between frames, e.g. in response to user
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/// actions, not during the build, layout, or paint phases.
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void clear() {
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value = Message();
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_textEditingController.clear();
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}
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/// Sets the [value] to the initial [Message] value.
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void reset({bool resetId = true}) {
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if (resetId) {
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final newId = const Uuid().v4();
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_initialMessage = _initialMessage.copyWith(id: newId);
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}
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value = _initialMessage;
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}
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@override
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void dispose() {
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removeListener(_textEditingSyncer);
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_textEditingController.dispose();
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super.dispose();
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}
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}
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/// A [RestorableProperty] that knows how to store and restore a
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/// [MessageInputController].
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///
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/// The [MessageInputController] is accessible via the [value] getter. During
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/// state restoration, the property will restore [MessageInputController.value]
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/// to the value it had when the restoration data it is getting restored from
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/// was collected.
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class RestorableMessageInputController
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extends RestorableChangeNotifier<MessageInputController> {
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/// Creates a [RestorableMessageInputController].
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///
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/// This constructor creates a default [Message] when no `message` argument
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/// is supplied.
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RestorableMessageInputController({Message? message})
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: _initialValue = message ?? Message();
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/// Creates a [RestorableMessageInputController] from an initial
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/// [text] value.
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factory RestorableMessageInputController.fromText(String? text) =>
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RestorableMessageInputController(message: Message(text: text));
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final Message _initialValue;
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@override
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MessageInputController createDefaultValue() =>
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MessageInputController(message: _initialValue);
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@override
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MessageInputController fromPrimitives(Object? data) {
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final message = Message.fromJson(json.decode(data! as String));
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return MessageInputController(message: message);
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}
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@override
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String toPrimitives() => json.encode(value.value);
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}
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Salvatore Giordano