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Help! an issue after removed the filter [message #642669]

Thu, 02 December 2010 09:44

Zongyong Qin

Messages: 4
Registered: December 2010

Junior Member

Hi,

I get a problem when use the filter to a CheckboxTreeViewer, could anyone help me?

I add a filter, which is just to return the checked elements, to a CheckboxTreeViewer, the filter is like:

    class TreeFilter extends ViewerFilter {

        @Override
        public boolean select(Viewer viewer, Object parentElement, Object element) {
            ItemRecord record = (ItemRecord) element;
            return repositoryTree.getChecked(record);
        }
    }

it works to filter the tree, but after that ,I removed this filter, the problem is happened: the before checked item is unchecked automatically, if add this fiter agian, it can't work well any more.

I create a check box to add or remove the filter, the code is like:

        showSelectBTN.addSelectionListener(new SelectionAdapter() {

            @Override
            public void widgetSelected(SelectionEvent e) {
                if (showSelectBTN.getSelection()) {
                    repositoryTree.addFilter(treeFilter);
                } else {
                    repositoryTree.removeFilter(treeFilter);
                    repositoryTree.expandAll();
                }
            }
        });

any suggestion is appreciated!

Regards,

Zongyong

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Re: Help! an issue after removed the filter [message #674523 is a reply to message #642669]

Fri, 27 May 2011 08:43

Zongyong Qin

Messages: 4
Registered: December 2010

Junior Member

Finally, I got a workround,I got the checked element before remove the filter, and set them checked after do that, am I on the right way to do that?

      
ItemRecord[] elements = getElements();
repositoryTree.removeFilter(treeFilter);
repositoryTree.expandAll();
repositoryTree.setCheckedElements(elements);

any suggestion is appreciated!

Regards,

Zongyong

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