Similar to you, I’m adding a console/log window to a GUI and would like the scroll bar at the bottom. With a list box, were you able to get rid of the ‘jump’ problem altogether?

I think there might be a solution using an edit box by diving deeper into the underlying Java. However, I have only recently started using the findjobj utility, so I could be wrong about that.

Nick

I am facing one problem when I write Java methods in Matlab.
Ex:
>> % Create the multi-line edit-box
>> str = {‘multi’,'line’,'editbox’};
>> hEdit = uicontrol(‘style’,'edit’,'max’,3,’string’,str);

This is the script I am writing in Matlab command window. After that
when I type the code

>> jhEdit = findjobj(hEdit)

Matlab is showing error

??? Undefined function or method ‘findjobj’ for input arguments of type
‘double’.

It is the first time I am using Jmethods in Matlab, will you please guide me what is the problem…

Thank you for your time,

Regards,
Sainath M.

All the best,
Johannes

first of all, thank you for the superb coding, findjobj has saved me from a lot of trouble. I am using your code to set the caret position to the last line inside an edit text box (used as a log inside my GUI) whenever I update the output.
One problem remains: To write something inside the edit text box, I am using

% get existing text
exTex=get(handles.outputWindow,'String');
% new Text to be appended
addTest=sprintf('Some new text');
% write new text 
newText=sprintf('%s \r %s ', exText, addText);
% update output handle
set(handles.outputWindow,'String',newText);

The problem now is: the set command in the last line resets the scroll bar to the top. So if some lines stream into the output window, it jumps to the top and quickly back to the bottom (due to the set.caretPosition). Is there any other way I could write lines into my output window, without resetting the scroll bar to the top?

Thanks and lots of regards from Germany!

In any case, here’s how to programmatically move the vertical scrollbar to the bottom:

jVScroll = jhEdit.getVerticalScrollBar;
jVScroll.setValue(jVScroll.getMaximum);
jhEdit.repaint;

More information about the scroll-bars: http://UndocumentedMatlab.com/blog/customizing-listbox-editbox-scrollbars/

I have used the FindObj fonction (great job M. Altman) and the carret does go to the end of the editbox, but the problem is that the view don’t follow the carret…
I would like to know if you have any idea, maybe a simple setting that I don’t know , to get the scrollbar at the bottom of the text (I am quite a beginner with the whole matlab graphic interface).

Regards,

Sylvain

1. the figure or one of its components is hidden, thereby causing a problem in retrieving the RootPane and/or TopLevelAncestor (=Frame peer) references.

2. are you using the latest version of FindJObj? – one of the latest versions increased the size/position tolerance used when trying to locate a handle onscreen and this may solve the problem of FindJObj not finding this handle.

If none of these appear to be the cause, then please email me a reproducible code snippet and I’ll try to fix the problem.

I’m having a problem with findjobj. It returns an empty result when I pass it the MATLAB handle of an edit box. The problem appears to begin in the call to getRootPanel on line 319 (jRootPane = jFigPanel.getRootPane).

The function falls through to line 346 (jRootPane = jRootPane.getTopLevelAncestor;) which also returns an empty result.

I’m trying to use a MATLAB GUI to display a message log, and would like to position the cursor at the end of the edit box. Interestingly, the edit box behavior under R14SP3 always placed the cursor at the end of the edit box. The behavior changed somewhere between that version and R2007b.

Any ideas you might have would be appreciated.

Thanks,
A. Bindemann