add function

lib/base/code_editor/EditorModel.dart

@@ -0,0 +1,101 @@
+
+import 'package:flutter/material.dart';
+import 'package:qinglong_app/utils/codeeditor_theme.dart';
+import 'FileEditor.dart';
+import 'EditorModelStyleOptions.dart';
+/// Use the EditorModel into CodeEditor in order to control the editor.
+///
+/// EditorModel extends ChangeNotifier because we use the provider package
+/// to simplify the work.
+class EditorModel extends ChangeNotifier {
+  late int _currentPositionInFiles;
+  bool _isEditing = false;
+  EditorModelStyleOptions? styleOptions;
+  late List<String?> _languages;
+  late List<FileEditor> allFiles;
+
+  /// Define the required parameters for the editor to work properly.
+  /// For that, you need to define [files] wich is a `List<FileEditor>`.
+  ///
+  /// You can also define your own preferences with [styleOptions].
+  EditorModel({required List<FileEditor> files, this.styleOptions}) {
+    if (this.styleOptions == null) {
+      this.styleOptions = new EditorModelStyleOptions(theme: qinglongLightTheme);
+    }
+    this._languages = [];
+    this._currentPositionInFiles = 0;
+    if (files.length == 0) {
+      files.add(
+        new FileEditor(
+          name: "index.html",
+          language: "html",
+          code: "",
+        ),
+      );
+    }
+    files.forEach((FileEditor file) {
+      this._languages.add(file.language);
+    });
+    this.allFiles = files;
+  }
+
+  /// Checks in all the given files if [language] is found,
+  /// then returns a List<String> of the files' content that uses [language].
+  List<String?> getCodeWithLanguage(String language) {
+    List<String?> listOfCode = [];
+    this.allFiles.forEach((FileEditor file) {
+      if (file.language == language) {
+        listOfCode.add(file.code);
+      }
+    });
+    return listOfCode;
+  }
+
+  /// Returns the code of the file where [index] corresponds.
+  String? getCodeWithIndex(int index) {
+    return this.allFiles[index].code;
+  }
+
+  /// Returns the file where [index] corresponds.
+  FileEditor getFileWithIndex(int index) {
+    return this.allFiles[index];
+  }
+
+  /// Switch the file using [i] as index of the List<FileEditor> files.
+  ///
+  /// The user can't change the file if he is editing another one.
+  void changeIndexTo(int i) {
+    if (this._isEditing) {
+      return;
+    }
+    this._currentPositionInFiles = i;
+    this.notify();
+  }
+
+  /// Toggle the text field.
+  void toggleEditing() {
+    this._isEditing = !this._isEditing;
+    this.notify();
+  }
+
+  /// Overwite the previous code of the file where [index] corresponds by [newCode].
+  void updateCodeOfIndex(int index, String? newCode) {
+    this.allFiles[index].code = newCode;
+    // this.allFiles[index].setCode = newCode;
+  }
+
+  void notify() => notifyListeners();
+
+  /// Gets the index of wich file is currently displayed in the editor.
+  int? get position => this._currentPositionInFiles;
+
+  /// Gets which language is currently shown.
+  String? get currentLanguage =>
+      this.allFiles[this._currentPositionInFiles].language;
+
+  /// Is the text field shown ?
+  bool get isEditing => this._isEditing;
+
+  /// Gets the number of files.
+  int get numberOfFiles => this.allFiles.length;
+}