在滚动条上使用setValue时，uitable标头中的损坏

Question

I am trying to create a table in MATLAB where I can change the scroll position programmatically. I created a uitable and extracted the handle of the Java UITablePeer object (designated here as htable ).

I then got the handle for the UIScrollbarPane object using:

hscroll = htable.getParent.getParent.getVerticalScrollBar

At this point, the figure looks like this (my actual table is more complicated, this is just something I made as an example):

The box at the lower left corner of the table is a pushbutton . When its callback is triggered, it uses the setValue method to change the scrollbar location, eg

hscroll.setValue(10)

After this, the table looks like this:

As you can see, the top of the table becomes corrupted. I've tried using the refresh function or repaint method, but they don't seem to help; the only way to "fix" this is to move another window (by dragging or Alt-Tabbing) such that the table is completely covered, and when I switch back to the table it's OK. Obviously, this isn't really an optimal solution.

Can anyone suggest a way to prevent or fix this?

Thanks

Answer 1

Here is my implementation (adapted from this code ):

% create a sample table with random data
figure('Menubar','none', 'Position',[400 400 250 300])
h = uitable('Units','normalized', 'Position',[0 0 1 1], ...
    'ColumnName',{'1','2'}, 'Data',num2cell(rand(50,2)>0.5));

% get Java handles
jScroll = findjobj(h, 'class','UIScrollPane');
jView = jScroll.getViewport();
jTable = jView.getView();

% scroll to specified row (make it the top row)
row = 20 - 1;        % 20th row (zero-based index)
jView.setViewPosition(java.awt.Point(0, row * jTable.getRowHeight()))
jScroll.repaint()    % workaround for any visual glitches

The table is correctly displayed (no glitches) every time I tried it: