Or is it not possible for the celltable to only redraw new rows? Will it
always redraw the whole table when adding to it?
On Monday, September 21, 2015 at 10:07:38 AM UTC-4, William Davis wrote:
>
> I have found an interesting issue, and I am wondering if I am misusing or
> overlooking something. I have a large CellTable that is vertically
> scrollable. I want to show all the rows at once instead of traditional
> pagination. So at the bottom of my table I have a row that the user can
> click to load 50 more rows. I have provided the table with a custom table
> builder (setTableBuilder(new Builder());). When the user clicks "load more"
> I query the data, add to the ListDataProvider and
> call table.setVisibleRange(0, dataProvider.getList().size());.
>
> I put a log statement in the
>
> @Override
> public void buildRowImpl(Object rowValue, int absRowIndex) {
> }
>
> method to see when it was building rows. I notice that it would build
> 0-dataProvider.getList().size() (all the rows), then it would build
> oldLength-dataProvider.getList().size() (the new rows). For instance, if I
> have 100 rows and then load 50 more it would build 0-150, and then rebuild
> 100-50. What I want is for it to only build the new rows, obviously.
>
> So I start debugging to see why it is rebuilding the whole table each
> time. What I found was in
> com.google.gwt.user.cellview.client.HasDataPresenter<T> it would set the
> "redrawRequired" flag to true at line 1325:
>
> else if (range1 == null && range0 != null && range0.getStart() == pageStart
> && (replaceDiff >= oldRowDataCount || replaceDiff > oldPageSize)) {
> // Redraw if the new data completely overlaps the old data.
> redrawRequired = true;
> }
>
> So my question is why does it think that the new data completely overlaps
> the old data?
>
> Am I using something incorrectly, is there a better way? This gets to be
> quite a slow down when it has to redraw thousands of rows that don't need
> to be redrawn.
>
> Thanks,
> Will
>
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