Ahhhhhhh... so then at the end to put the sorted list back in the original and update the table
BOOKS = new ArrayList(thisList); cellTable.setRowData(BOOKS); Wow that makes sense. I knew it was something stupid. I understand why John had this line above now: List<T> newData = new ArrayList(cellTable.getVisibleItems()); // Copy the data On Feb 23, 2:11 pm, Greg Dougherty <[email protected]> wrote: > Well, I'd start out by trying: > public MySortHandler(List<Book> BOOKS, CellTable myCellTable, > Column columnA, .... you get the picture) { > thisList = new ArrayList (BOOKS); > ...... > } > > On Feb 23, 9:56 am, Josh K <[email protected]> wrote: > > > > > > > > > Ok, I got something working using the example you provided, but I > > don't like how I implemented it. It wasn't hard, but everything I've > > wanted to do in GWT so far has been easy, so this seems kind of > > messy.. > > > But, I guess trying to implement sorting using a ListSortHandler would > > have been just as messy since I would have had to setComparator for > > every column still right? > > > Also, this is probably a stupid Java error, but I'm trying to re-use > > my SortHandler so I broke it into it's own class. In each composite > > I've got a list of what is displayed in the tables, call it BOOKS. > > What I've been trying to do is instantiate the SortHandler: > > > new MySortHandler (BOOKS, myCellTable, columnA, columnB, columnC, > > etc..) > > > And in class I've got something like > > public class MySortHandler { > > private List<Book> thisList; > > > public MySortHandler(List<Book> BOOKS, CellTable myCellTable, > > Column columnA, .... you get the picture) { > > thisList = BOOKS; > > ...... > > } > > > Down below I sort thisList, and at the end, I assign it back to BOOKS > > and do cellTable.setRowData(BOOKS); > > > When I go to sort though, nothing happens. I think I narrowed it down > > to understand for some reason the list isn't getting copied over or > > something like that? If I have MySortHandler as an internal private > > class to my composite and I use the original List BOOKS, it sorts, but > > when I try to do like I was doing above, it doesn't work. > > > Can anyone explain why, and give me an idea of how to fix it. I'll be > > alright without code, just don't even know how to get around this. I'd > > hate to have to stick an internal SortHandler at the end of each > > composite. > > > On Feb 14, 12:19 pm, Josh K <[email protected]> wrote: > > > > What I was getting confused about doing it this way though is if I'm > > > allowing the data to be sorted by 4 or 5 different columns, would I > > > have to say something like: > > > > if (event.isSortAscending && nameColumn) { > > > Collections.sort(newData, nameAscComparator)} else if (nameColumn) { > > > > Collections.sort(newData, nameDescComparator)} else if > > > (event.isSortAscending && timeRequestedColumn) { > > > > Collections.sort(newData, timeRequestedAscComparator) > > > > } .... > > > > ya know where I have to have a different asc and desc comparator for > > > each column and figure out which column was selected before I sort? > > > > I'm thinking that I'll have a small enough set of rows (probably max > > > 100 rows at a time), that if I just make the columns sortable, it will > > > be fine if I don't use paging. So maybe I should do what Greg > > > mentioned and download all the data and use a ListDataProvider. What I > > > liked about the AsyncDataProvider though is that people can change the > > > value of a cell and hit enter and it's updated in the database because > > > this will be an application a couple are using at one time all dealing > > > with the same data so I need changes to show up on what other people > > > are seeing. > > > > BTW, thanks a lot guys! > > > > On Feb 14, 10:00 am, John LaBanca <[email protected]> wrote: > > > > > If you are supporting paging, then a local sort will only sort the > > > > current > > > > page, whereas a database sort would sort the data return the results > > > > for the > > > > current page. For example, if you are on the first page and do a > > > > reverse > > > > sort, do you want to see all the names that start with z (database > > > > sort), or > > > > do you want to see all of the names that start with a in reverse order > > > > (local sort of the current page). > > > > > That being said, you can cache the values locally in a list and use > > > > ListSortHandler. Alternatively, you can add a ColumnSortEvent.Handler > > > > to > > > > CellTable and copy and sort the return of CellTable#getVisibleItems(). > > > > The > > > > code would be something like the following: > > > > > cellTable.addColumnSortHandler(new ColumnSortEvent.Handler() { > > > > public void onColumnSort(ColumnSortEvent event) { > > > > List<T> newData = new ArrayList(cellTable.getVisibleItems()); // > > > > Copy > > > > the data > > > > if (event.isSortAscending) { > > > > Collections.sort(newData, myAscComparator); // Sort ascending. > > > > } else { > > > > Collections.sort(newData, myDescComparator); // Sort descending. > > > > } > > > > cellTable.setRowData(cellTable.getVisibleRange(), newData); > > > > } > > > > > }); > > > > > Thanks, > > > > John LaBanca > > > > [email protected] > > > > > On Mon, Feb 14, 2011 at 12:53 AM, Josh K <[email protected]> > > > > wrote: > > > > > I've been developing an application in GWT that has data I've been > > > > > displaying in a CellTable. I've set it up with a few TextColumns and a > > > > > few EditTextColumns. I've got it set up to where if someone changes > > > > > the data in an EditText cell, it sends an asynchronous request to the > > > > > database and updates that row in the DB table. In short, I've got all > > > > > this working using AsyncCallbacks and an AsyncDataProvider. > > > > > > Since 2.2 came out, I want to implement column sorting, kind of like > > > > > is seen in this example: > > > > >http://gwt.google.com/samples/Showcase/Showcase.html#!CwCellTable > > > > > , but with an AsyncDataProvider. I want to sort the columns locally > > > > > because I think it'd be faster than making an Async DB call again each > > > > > time someone clicks to sort (which is the impression of what was > > > > > supposed to happen if I used an AsyncHandler. > > > > > > So I THINK what I'm looking for is some way to use a ListHandler with > > > > > an AsyncDataProvider? > > > > > > Can anyone shed some light on this? Maybe done it before or know the > > > > > direction I'm supposed to? If it's even do-able? > > > > > > -- > > > > > You received this message because you are subscribed to the Google > > > > > Groups > > > > > "Google Web Toolkit" group. > > > > > To post to this group, send email to > > > > > [email protected]. > > > > > To unsubscribe from this group, send email to > > > > > [email protected]. > > > > > For more options, visit this group at > > > > >http://groups.google.com/group/google-web-toolkit?hl=en. -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
