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How do i use the UndoManger?
Oct 8th, 2008 at 1:01pm
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I'm new to netdiagram and am unable to find a way to undo user action.I need to undo the last user action which could be a change in the size of the node or the link.When i click on an "undo" button it should go back to the original shape.Can someone please help me with this?

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Stoyo
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Re: How do i use the UndoManger?
Reply #1 - Oct 8th, 2008 at 1:30pm
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Currently undo can be used only on the client side in JavaApplet mode through the DiagramApplet API. You must handle the AppletStarted client side event, and call diagram.getUndoManager().setUndoEnabled(true) from the handler. Then the undo button click handler could call diagram.getUndoManager().undo().

I hope that helps,
Stoyan
  
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Re: How do i use the UndoManger?
Reply #2 - Oct 10th, 2008 at 7:04am
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I'm not able to get the getUndoManager method of Diagram.Am i missing something?

Thanks for your response.
  
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Re: How do i use the UndoManger?
Reply #3 - Oct 10th, 2008 at 10:56am
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Assuming the JavaScript 'applet' variable refers to the DiagramApplet object, you can access the UndoManager instance like this:

var applet = <%= diagramView.AppletElement %>;
var um = applet.getDiagram().getUndoManager();

I hope that helps,
Stoyan
  
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Re: How do i use the UndoManger?
Reply #4 - Oct 14th, 2008 at 8:40am
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Thanks a lot ! It works perfectly Smiley
  
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Re: How do i use the UndoManger?
Reply #5 - Aug 18th, 2010 at 1:50pm
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hello,

do you have any examples for redo/undo
I try it but it doesn't work

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Re: How do i use the UndoManger?
Reply #6 - Aug 18th, 2010 at 2:49pm
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Hi,

You can use undo/redo only in JavaApplet or Silverlight mode, and you must enable it from JavaScript. Assuming you've got an UndoManager instance in Java mode as shown above, call um.setUndoEnabled(true) to enable it.

I hope that helps,
Stoyan
  
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