Sorting grid does not affect the scroll

[vemCastro]

hi guys,

He needed a helping hand in a specific case. I am using the grid component and having a problem. In my grid i have many items, if you select one of the elements present on the bottom of the list, and then sort the grid by a column, the scroll to do when the sort is always pulled to the beginning, and therefore do not see my item selected. How can I keep my selected item always visible, or that the ordinance does not affect the scroll?

Sorry my bad english.

Thanks

[Colin Alworth]

Add a listener to the sort event (probably on the ListStore), and then tell the grid to scroll to the currently selected items (using the SelectionModel).

[vemCastro]

Not exactly what I needed.
the item always remains selected, however as the scroll is placed at the beginning visually lose the selected item. I want to always view the selected element.

[Colin Alworth]

And that is what I said - once you catch the event indicating that a sort has occurred, instruct the Grid to scroll to the given element. I know it remains selected - the state of the grid shouldn't change over a local sort, but the grid's viewport doesn't know to keep that element in view, so you must fire a grid.getGridView().ensureVisible(row, 0, false) call to make sure the row is shown.

Note that this call can be used to ensure a given column is visible as well, and can set horizontal scroll as well, but from your usecase, I don't think you want either of those.

[carbotox]

You can take the scroll state and restore it after sort is done.

getting scrollState before sort:

getStore().addListener(Store.BeforeSort,
                new Listener<StoreEvent<HMapModel>>() {

                    @Override
                    public void handleEvent(StoreEvent<HMapModel> be) {
                        if (isRendered()) {
                            scrollState = getView().getScrollState();
                        }
                    }
                });

Apply scrollState aftre sort is done:

 addListener(Events.SortChange, new Listener<GridEvent<ModelData>>() {

            @Override
            public void handleEvent(GridEvent<ModelData> be) {
                restoreScrollerState();
            }
        });

 private void restoreScrollerState() {
        if (scrollState != null) {
            El scroller = getView().getScroller();
            if (scrollState.y < scroller.getWidth()) {
                scroller.setScrollLeft(scrollState.x);
            }
            if (scrollState.x < scroller.getHeight()) {
                scroller.setScrollTop(scrollState.y);
            }
        }
    }