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POJava 6: How to set up UndoManager to work with a canvas?
 

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  1. POJava 6: How to set up UndoManager to work with a canvas?
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    <p>I am trying to set up <code>UndoManager</code> in a paint-like program, but miserably failing at that. The sample programs, which I have been looking at, are text editors (<a href="http://www.example8.com/node/view/id/18933" rel="nofollow">Example</a>) and they call the method <code>addUndoableEditListener</code> of class <code>JTextComponent</code>. </p> <p>How should I set up UndoManager to work with a canvas? </p> <pre class="lang-java prettyprint-override"><code>public class Pisi extends JFrame implements MouseMotionListener, MouseListener, UndoableEditListener { ArrayList&lt;ArrayList&lt;Point&gt;&gt; store = new ArrayList&lt;ArrayList&lt;Point&gt;&gt;(); ArrayList&lt;Point&gt; pts = new ArrayList&lt;Point&gt;(); ArrayList&lt;Point&gt; newRed; ArrayList&lt;Point&gt; currentRed = new ArrayList&lt;Point&gt;(); JPanel panel; Point start; static int xsize = 500; static int ysize = 350; int listNumber = 0; int lastPointed = -1; int pointed = -1; int clicked = -1; UndoManager undoManager = new UndoManager(); UndoAction undoAction = new UndoAction(); RedoAction redoAction = new RedoAction(); protected MyUndoableEditListener l = new MyUndoableEditListener(); public Pisi() { panel = new JPanel() { @Override public void paintComponent(Graphics g) { super.paintComponent(g); } }; setSize(xsize, ysize); setResizable(false); getContentPane().setLayout(null); getContentPane().add(panel); setLocationRelativeTo(null); setVisible(true); panel.setLocation(0, -11); this.addMouseMotionListener(this); this.addMouseListener(this); **this.addUndoableEditListener(this);** } public static void main(String[] args) { Pisi d = new Pisi(); } *... more code...* } </code></pre> <p>All input will be well appreciated. </p>
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    1. COCan you set up it to work with panel?
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    2. COIt seems you are not right about listener, panel, canvas. Sorry, I don't understand what are you talking as it contradict with the question
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