MATLAB: How to control Uitable scroller position

findjobjMATLABMATLAB Compiler SDKscrollbaruitable

Hi,

when an uitable is updated, uitable automatically resets to focus on the top row of data.

Is there a way to set the scroll position in the table instead of "jumping" every time the table is updated?

Thankyou for your time…

Regards, Sainath M.

Best Answer

This workaround solution use again the FEX: findjobj functionality and implicitly sets the selection mode to SINGLE_SELECTION. If the user selects a new cell, then the focus is switched to the view making the selected row now visible again.

    set(mtable, 'CellSelectionCallBack', @selectionChangeCallBack);
    function selectionChangeCallBack(src, eventdata)
        if ~isempty( eventdata.Indices)
            where_changed = eventdata.Indices(1);
            jscrollpane = javaObjectEDT(findjobj(src));
            viewport    = javaObjectEDT(jscrollpane.getViewport);
            jtable      = javaObjectEDT( viewport.getView );
            jtable.scrollRowToVisible(where_changed - 1);
        end
    end

it requires findjobj functionality, and works fine on Matlab R2017a.

Related Solutions

MATLAB: How to update uitable data without resetting column widths and scroll position

If you want the scroll bar not to jump up to the top and jump back down to the previous position, you can use the following workaround. You can programmatically select a new row, then the focus is switched to the view making the selected row now visible again.The working solution running safely on Java Swing’s Event Dispatch Thread (EDT) without risking a race-condition or deadlock with the EDT would be:

        jscrollpane = javaObjectEDT(findjobj(src));
        viewport    = javaObjectEDT(jscrollpane.getViewport);
        jtable      = javaObjectEDT( viewport.getView );
        jtable.scrollRowToVisible(row_ - 1);

It requires findjobj functionality, and works fine on Matlab R2017a. Other solutions exists but may risk race-conditions with the Event Dispatch Thread (EDT).

MATLAB: Programatically selecting cells in a uitable

I figured out the answer by further reviewing the long thread in my question. Here is some updated code that works at least until Matlab R2015b.

% m = numeric handle to uitable
m = uitable(...); 
jUIScrollPane = findjobj(m);
jUITable = jUIScrollPane.getViewport.getView;
jUITable.changeSelection(row-1,col-1, false, false);
% subtract 1 from row and col you want selected
% the last two arguments do the following:
% false, false: Clear the previous selection and ensure the
%  new cell is selected.
% false, true: Extend the previous selection (select a range of cells).
% true, false: Toggle selection
% true, true: Apply the selection state of the anchor to all cells
%  between it and the specified cell.

Using combinations of the last two arguments, you can select any cells you want programatically, even if they're not contiguous.

Best Answer

Related Solutions

MATLAB: How to update uitable data without resetting column widths and scroll position

MATLAB: Programatically selecting cells in a uitable

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