don't know how to pass 4th condition, HELP PLS

Question about the task

HTML Editor (part 15)

Java Multithreading, Level 8, Lesson 15

Resolved

"The resetDocument() method should call the addUndoableEditListener() method on the document."

Add a resetDocument() method to the controller. It should reset the current document. It must:
15.1. Remove the undo/redo edit listener from the current document (find the appropriate method inherited from AbstractDocument). You need to ask the view for the listener (getUndoListener() method).
Don't forget to verify that the current document exists (is not null).
15.2. Create a new default document and assign it to the document field.

Hint: use an appropriate method from the HTMLEditorKit class.

15.3. Add an edit listener to the new document.
15.4. Call the view's update() method.

Requirements:

The Controller class must contain a public resetDocument() method that resets the current document.
The resetDocument() method should use the removeUndoableEditListener() method to remove the edit listener from the current document.
The resetDocument() method should create a new default document using the createDefaultDocument() method.
The resetDocument() method must use the addUndoableEditListener() method to add an edit listener to the new document.
The resetDocument() method should call the update() method on the view.

package com.codegym.task.task32.task3209; import javax.swing.text.html.HTMLDocument; import javax.swing.text.html.HTMLEditorKit; import java.io.File; public class Controller { private View view; private HTMLDocument document; private File currentFile; public Controller(View view) { this.view = view; } public void init() { } public void exit() { System.exit(0); } public void resetDocument() { if(document != null) document.removeUndoableEditListener(view.getUndoListener()); HTMLEditorKit kit = new HTMLEditorKit(); document = (HTMLDocument) kit.createDefaultDocument(); //document.addUndoableEditListener(view.getListeners()); view.update(); } public HTMLDocument getDocument() { return document; } public static void main(String[] args) { View view = new View(); Controller controller = new Controller(view); view.setController(controller); view.init(); controller.init(); } }

Comments (1)

Popular
New
Old

You must be signed in to leave a comment

Henrique

Level 41 , São Paulo, Brazil

17 August 2020, 20:06

Solved: it should be:

document.addUndoableEditListener(view.getUndoListener());