Thread Subject:

Changing Multiple Cells in Uitable

I'm wondering if there's a way to change data in multiple cells without having to reload the whole table?

I currently have a table with one column as checkboxes, and certain rows are used to represent a group of other rows. I currently have it so that if one of these "group" checkboxes is pressed, it changes the data for the table in those cells, then i use the set command to load the new data. This can be cumbersome and slow, so I am wondering if I can have the checkboxes changed without having to reload the whole data.

My current idea is to find a way to specifically refrence those cells, but I can't find a way to do that. I have found a way on the forums in which you go through the Java handle, but that doesn't work with 2010a.

Thanks

Anton Kotelyanskii wrote:
> I'm wondering if there's a way to change data in multiple cells without
> having to reload the whole table?

http://www.mathworks.com/matlabcentral/newsreader/view_thread/281187

Walter Roberson <roberson@hushmail.com> wrote in message <hutuav$lim$1@canopus.cc.umanitoba.ca>...
> Anton Kotelyanskii wrote:
> > I'm wondering if there's a way to change data in multiple cells without
> > having to reload the whole table?
>
> http://www.mathworks.com/matlabcentral/newsreader/view_thread/281187
This is the method that I found using Java handles that doesn't work with 2010a.
 jtable = mtable.getTable; results in the error message: "??? Attempt to reference field of non-structure array."

"Anton Kotelyanskii" <akotelyanskiI@yahoo.com> wrote in message <hv0asb$k75$1@fred.mathworks.com>...
> Walter Roberson <roberson@hushmail.com> wrote in message <hutuav$lim$1@canopus.cc.umanitoba.ca>...
> > Anton Kotelyanskii wrote:
> > > I'm wondering if there's a way to change data in multiple cells without
> > > having to reload the whole table?
> >
> > http://www.mathworks.com/matlabcentral/newsreader/view_thread/281187
> This is the method that I found using Java handles that doesn't work with 2010a.
> jtable = mtable.getTable; results in the error message: "??? Attempt to reference field of non-structure array."

In your case, you are probably using the new (R2008a+, supported) version of uitable, rather than the old (pre-R2008a, unsupported) version. Unfortunately, unlike the unsupported version, the new version does not directly expose its Java handle. However, you can use the FindJObj utility on the File Exchange ( http://www.mathworks.com/matlabcentral/fileexchange/14317-findjobj ) to get this reference:

mtable = uitable(...);
jscroll = findjobj(mtable);
jtable = jscroll.getViewport.getComponent(0);

Note that the new uitable version extends com.jidesoft.grid.SortableTable, which provides the ability to group rows - something that could be most useful from your description of your problem. Obviously this functionality is only accessible via Java.

Yair Altman
http://UndocumentedMatlab.com

"Yair Altman" <altmanyDEL@gmailDEL.comDEL> wrote in message <hv0q3r$qb3$1@fred.mathworks.com>...
> "Anton Kotelyanskii" <akotelyanskiI@yahoo.com> wrote in message <hv0asb$k75$1@fred.mathworks.com>...
> > Walter Roberson <roberson@hushmail.com> wrote in message <hutuav$lim$1@canopus.cc.umanitoba.ca>...
> > > Anton Kotelyanskii wrote:
> > > > I'm wondering if there's a way to change data in multiple cells without
> > > > having to reload the whole table?
> > >
> > > http://www.mathworks.com/matlabcentral/newsreader/view_thread/281187
> > This is the method that I found using Java handles that doesn't work with 2010a.
> > jtable = mtable.getTable; results in the error message: "??? Attempt to reference field of non-structure array."
>
> In your case, you are probably using the new (R2008a+, supported) version of uitable, rather than the old (pre-R2008a, unsupported) version. Unfortunately, unlike the unsupported version, the new version does not directly expose its Java handle. However, you can use the FindJObj utility on the File Exchange ( http://www.mathworks.com/matlabcentral/fileexchange/14317-findjobj ) to get this reference:
>
> mtable = uitable(...);
> jscroll = findjobj(mtable);
> jtable = jscroll.getViewport.getComponent(0);
>
> Note that the new uitable version extends com.jidesoft.grid.SortableTable, which provides the ability to group rows - something that could be most useful from your description of your problem. Obviously this functionality is only accessible via Java.
>
> Yair Altman
> http://UndocumentedMatlab.com

Yair:
   thanks for the usefull posts.
I can successfully get the java handle using finjobj like your coude suggests, however wen I change a property of the java object (jtable) the uitable doesen't change at all, no matter what changes I perform. I think that might not be the correct Java handle. I'm usig Matlab 2010a, I would greatly appreciate your help.
Regards

"Felipe " <frlastrico@gmail.com> wrote in message
> I can successfully get the java handle using finjobj like your coude suggests, however wen I change a property of the java object (jtable) the uitable doesen't change at all, no matter what changes I perform. I think that might not be the correct Java handle. I'm usig Matlab 2010a, I would greatly appreciate your help.


If you posted your code snippet, I could see what you tried to do and possibly correct you

Yair

"Yair Altman" <altmanyDEL@gmailDEL.comDEL> wrote in message <i67cdf$rgc$1@fred.mathworks.com>...
> "Felipe " <frlastrico@gmail.com> wrote in message
> > I can successfully get the java handle using finjobj like your coude suggests, however wen I change a property of the java object (jtable) the uitable doesen't change at all, no matter what changes I perform. I think that might not be the correct Java handle. I'm usig Matlab 2010a, I would greatly appreciate your help.
>
>
> If you posted your code snippet, I could see what you tried to do and possibly correct you
>
> Yair

I worked around a little bit. I wanted to do two things;
one was slecting the entire row when a user clicked on any cell belonging to that row. I was able to do this, I'll post the code:

%I created the java handle using the form
Table=uitable('Data',MyData,'CellSelectionCallback',@cellSelTable);
jtscroll=findjobj(Table);
jTable=jtscroll.getViewport.getComponent(0);

%then the cellSelTable callback funcion
function cellSelTable(ho,edata)
global jTable
persistent ctrlj
if isempty(ctrlj)
    ctrlj=0;
    XY=edata.Indices;
    jTable.changeSelection(XY(1)-1,0, false, false)
    jTable.changeSelection(XY(1)-1,3, false, true)
    return
end
ctrlj=ctrlj+1;
if ctrlj==2
    ctrlj=[];
end
end

I had to create the persistent variable "ctrlj" because when I call changeSelection it calls cellSelTable and without that solution it generated a loop. I know the solution may be very inefficient, but at least this does the trick and I hope it results useful to someone.

The second thing I want is to change the color of specific cells/rows acording to their values.
I am able to change the color of selected cells using the form
jTable.setSelectionForeground(java.awt.Color.blue)
jTable.setSelectionBackground(java.awt.Color.green)
but I can't figure out how to change the color of specific non selected cells.
I read about your java user-class ColoredFieldCellRenderer.java. But I don't know how to apply this to matlab. My biggest issue is my null knowledge of Java.
Thanks for your reply.

Hello!

I have nearly the same problem!
I just want to change the color of a specific cell in a table (independ of the value which is currently displayed). I am using 2010a and it seems a little bit tricky!? A code snippet would be great :-)


Best regards,
Michael

"Michael " <xyMueller@web.de> wrote in message <i72325$7tr$1@fred.mathworks.com>...
> Hello!
>
> I have nearly the same problem!
> I just want to change the color of a specific cell in a table (independ of the value which is currently displayed). I am using 2010a and it seems a little bit tricky!? A code snippet would be great :-)


Simply place HTML formatting in your cell:
cellStr = '<html><font color="red">123.456';

See related: http://undocumentedmatlab.com/blog/html-support-in-matlab-uicomponents/

Yair Altman
http://UndocumentedMatlab.com

Yippi :-)
That's great and exactly what I needed!
Many, many thanks Mr. Altman!


Best regards,
Michael

"Michael" wrote in message <i752ic$gmk$1@fred.mathworks.com>...
> Yippi :-)
> That's great and exactly what I needed!
> Many, many thanks Mr. Altman!
>
>
> Best regards,
> Michael

Wow. So I'm coming back to this post more than a year later and I'm still dealing with jtable...

First of all, thanks a LOT to Mr. Altman, his various posts and articles have helped me a lot.

Second, I did find the solution to this problem a while ago. To use the various java/jtable commands, you have to summon the old version of uitable, which can be done by using the 'ColumnNames' property instead of 'ColumnName' when creating the table.