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Carrotlord

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  • Noxid
    Yo carrotlord, I gotta level with you dawg. you've been illin' on homies for a while now and people's starting to take notice. Chillax a bit and have some respect G, don't give hate a chance.
    duncathan
    It's the 4th already! Why have elections not finished yet?
    C
    Carrotlord
    They are done. I just didn't say anything.
    Tpcool
    Tpcool
    The suspense is killing me!!
    S
    Shane
    I'm still alive, I'm too busy to get killed by suspense.

    <div class='bbc_spoiler'>
    <span class='spoiler_title'>Spoiler</span> <input type='button' class='bbc_spoiler_show' value='Show' />
    <div class='bbc_spoiler_wrapper'><div class='bbc_spoiler_content' style="display:none;"><div class='mirai_spoiler_wrapper'>And that's my lame attempt at a joke. :/ </div></div></div>
    </div>
    Hina
    C
    Okay, uh... I have a working model of undo/redo in a text editor and the source code.

    I'll give you the details behind the code as long as you import the right classes and such.

    Code: 
        private UndoManagerTeam undoManageTeam = new UndoManagerTeam();
    private UndoAction undoActionObj = new UndoAction();
    private RedoAction redoActionObj = new RedoAction();
    private JMenuItem undoItem;
    private JMenuItem redoItem;

    Those were some of the fields, i.e. class variables, of my text editor GUI. There is a menu item for undo, a menu item for redo (which are attached to Ctrl+Z and Ctrl+Y respectively), an undo object, a redo object, and a team of undoManager objects.

    The only reason I have a "team" of undo managers instead of just one is that each text edit tab requires its own undo/redo capabilities. I assume you want the same feature for your TSC editor or whatever you're building.

    Code: 
    private class UndoManagerTeam {
    private ArrayList<UndoManager> undoManageTeam =
                                   new ArrayList<UndoManager>();
    
    private void addManager() {
        undoManageTeam.add(new UndoManager());
    }
    
    private void removeManager(int index) {
        undoManageTeam.remove(index);
    }
    
    private UndoManager getCurrentManager() {
        int currentIndex = tabManageObj.getCurrentTabIndex();
        return undoManageTeam.get(currentIndex);
    }
}

    The above code is the code for the undo manager team. It's just an abstraction for an ArrayList. UndoManager is a built-in java class.

    Code: 
    private class CustomUndoableEditListener implements UndoableEditListener {
    @Override
    public void undoableEditHappened(UndoableEditEvent event) {
        undoManageTeam.getCurrentManager().addEdit(event.getEdit());
    }
}

private class UndoAction extends AbstractAction {
    @Override
    public void actionPerformed(ActionEvent event) {
        try {
            UndoManager currentManager = undoManageTeam.getCurrentManager();
            if (currentManager.canUndo())
                currentManager.undo();
        } catch (CannotUndoException exceptionInfo) {
            //Ignore the exception.
        }
    }
}

private class RedoAction extends AbstractAction {
    @Override
    public void actionPerformed(ActionEvent event) {
        try {
            UndoManager currentManager = undoManageTeam.getCurrentManager();
            if (currentManager.canRedo())
                currentManager.redo();
        } catch (CannotRedoException exceptionInfo) {
            //Ignore the exception.
        }
    }
}

    The above code for RedoAction, UndoAction, and CustomUndoableEditListener are the basis for your undo/redo stuff.

    Code: 
        private ArrayList<CustomUndoableEditListener> editListeners =
            new ArrayList<CustomUndoableEditListener>();

    private void addTab() {
        JScrollPane newScrollPane = new JScrollPane();
        JTextPane newTextPane = new JTextPane();
        newScrollPane.setViewportView(newTextPane);
        textPaneList.add(newTextPane);
        tabList.add(newScrollPane);
        mainTabbedPane.addTab("New File",newScrollPane);
        filesBeingEdited.add("");
        undoManageTeam.addManager();
        editListeners.add(new [COLOR="Red"][B]CustomUndoableEditListener[/B][/COLOR]());
        addPropertiesToTextPane(newTextPane);
        switchToLastTab();
    }

    Finally, whenever a new tab is created by the user, an new CustomUndoableEditListener must be created for that tab.

    I'm sorry if that made little sense. I copy-pasta'd most of the undo/redo code from the Java tutorials and made modifications so that it'd work for multiple tabs. I got my information here: http://download.oracle.com/javase/tutorial/uiswing/components/generaltext.html#undo

    So yeah. Feel free to bombard me with additional questions. The undo/redo stuff is not just limited to text, so you could use it to undo CS map editing actions and emulate the other stuff you see in CaveEditor.
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