Shortcut Formatter

import 'package:cometchat_chat_uikit/cometchat_chat_uikit.dart';

class ShortcutFormatter extends CometChatTextFormatter {
  @override
  void init() {
    trackingCharacter ??= "!";
  }

  bool isShortcutTracking = false;

  void prepareShortcuts(TextEditingController textEditingController) {
    CometChat.callExtension('message-shortcuts', 'GET', '/v1/fetch', null,
      onSuccess: (map) {
        if (map.isNotEmpty) {
          Map<String, dynamic> data = map["data"];
          if (data.isNotEmpty) {
            Map<String, dynamic> shortcuts = data["shortcuts"];
            if (shortcuts.isNotEmpty) {
              parseData(shortcuts: shortcuts, textEditingController: textEditingController);
            }
          }
        }
      },
      onError: (error) {},
    );
  }

  void parseData({Map<String, dynamic>? shortcuts, required TextEditingController textEditingController}) async {
    if (shortcuts == null || shortcuts.isEmpty) {
      suggestionListEventSink?.add([]);
      if (onSearch != null) onSearch!(null);
      CometChatUIEvents.hidePanel(composerId, CustomUIPosition.composerPreview);
    } else {
      CometChatUIEvents.hidePanel(composerId, CustomUIPosition.composerPreview);
      if (suggestionListEventSink != null && shortcuts.isNotEmpty) {
        List<SuggestionListItem> list = [];
        shortcuts.forEach((key, value) => list.add(SuggestionListItem(
          id: key,
          title: "$key → $value",
          onTap: () {
            int cursorPos = textEditingController.selection.base.offset;
            String left = textEditingController.text.substring(0, cursorPos - 1);
            String right = textEditingController.text.substring(cursorPos);
            textEditingController.text = "$left$value $right";
            updatePreviousText(textEditingController.text);
            textEditingController.selection = TextSelection(
              baseOffset: cursorPos - 1 + "$value".length + 1,
              extentOffset: cursorPos - 1 + "$value".length + 1,
            );
            resetMatchTracker();
            isShortcutTracking = false;
            CometChatUIEvents.hidePanel(composerId, CustomUIPosition.composerPreview);
          },
        )));
        suggestionListEventSink?.add(list);
      }
    }
  }

  void updatePreviousText(String text) {
    previousTextEventSink?.add(text);
  }

  void resetMatchTracker() {
    suggestionListEventSink?.add([]);
    if (onSearch != null) onSearch!(null);
  }

  @override
  void onChange(TextEditingController textEditingController, String previousText) {
    var cursorPosition = textEditingController.selection.base.offset;
    if (textEditingController.text.isEmpty) {
      resetMatchTracker();
      return;
    }
    // Handle shortcut tracking logic
    String previousCharacter = cursorPosition == 0 ? "" : textEditingController.text[cursorPosition - 1];
    bool isSpace = cursorPosition == 1 || (textEditingController.text.length > 1 && cursorPosition > 1 &&
        (textEditingController.text[cursorPosition - 2] == " " || textEditingController.text[cursorPosition - 2] == "\n"));

    if (isShortcutTracking) {
      isShortcutTracking = false;
      if (onSearch != null) onSearch!(null);
      CometChatUIEvents.hidePanel(composerId, CustomUIPosition.composerPreview);
    } else if (previousCharacter == trackingCharacter && isSpace) {
      isShortcutTracking = true;
      if (onSearch != null) onSearch!(trackingCharacter);
      CometChatUIEvents.showPanel(composerId, CustomUIPosition.composerPreview,
          (context) => getLoadingIndicator(context, cometChatTheme));
      prepareShortcuts(textEditingController);
    }
  }

  @override
  TextStyle getMessageInputTextStyle(CometChatTheme theme) {
    throw UnimplementedError();
  }

  @override
  void handlePreMessageSend(BuildContext context, BaseMessage baseMessage) {}

  @override
  void onScrollToBottom(TextEditingController textEditingController) {}
}

CometChatMessageComposer(
  user: user,
  textFormatters: [ShortcutFormatter()],
)