Itqualityassurance
- How do you implement undo functionality?
- What is the role of undo?
- How do you implement undo and redo in computer?
- How to undo in Java?
How do you implement undo functionality?
To implement Undo , you work backward from the tail of the linked-list, using a 'current-node' pointer or index: where the change was insert , you do a delete but without updating the linked-list; and where it was a delete you insert the data from the data in the linked-list buffer.
What is the role of undo?
Undo is an interaction technique which is implemented in many computer programs. It erases the last change done to the document, reverting it to an older state. In some more advanced programs, such as graphic processing, undo will negate the last command done to the file being edited.
How do you implement undo and redo in computer?
To undo an action, press Ctrl + Z. To redo an undone action, press Ctrl + Y. The Undo and Redo features let you remove or repeat single or multiple typing actions, but all actions must be undone or redone in the order you did or undid them – you can't skip actions.
How to undo in Java?
// undo and redo private Document editorPaneDocument; protected UndoHandler undoHandler = new UndoHandler(); protected UndoManager undoManager = new UndoManager(); private UndoAction undoAction = null; private RedoAction redoAction = null; Let's see how these objects are used in my Java application.
