Hi Raymond,
I've taken a stab at this in the listwidget sample project. I wanted the
view screen to be its own Place for bookmarking, so I created a
HyperlinkCell and use utility methods in RequestFactory and
PlaceHistoryMapper to create a URL from an ID / Place. Here's the relevant
code from ListsViewImpl (arguably doesn't really belong in the view, but I
haven't moved it out yet):
Column<ItemListProxy, Hyperlink> linkColumn = new Column<ItemListProxy,
Hyperlink>(new HyperlinkCell())
{
@Override
public Hyperlink getValue(ItemListProxy list)
{
String proxyToken =
clientFactory.getRequestFactory().getHistoryToken(list.stableId());
String historyToken =
clientFactory.getHistoryMapper().getToken(newEditListPlace(proxyToken));
Hyperlink h = new Hyperlink(list.getName(),historyToken);
return h;
}
};
cellTable.addColumn(linkColumn, "Edit");
and HyperlinkCell:
public class HyperlinkCell extends AbstractCell<Hyperlink>
{
@Override
public void render(com.google.gwt.cell.client.Cell.Context context,
Hyperlink h, SafeHtmlBuilder sb)
{
// WARNING Make sure there's no user-provided content in
your link!
sb.append(SafeHtmlUtils.fromTrustedString(h.toString()));
}
}
To decode the URL, use the companion method in RequestFactory:
final ListwidgetRequestFactory req = clientFactory.getRequestFactory();
EntityProxyId<ItemListProxy> proxyId = req.getProxyId(this.itemListToken);
All this is necessary only if you want the detail screen to be a
bookmarkable Place; otherwise, you can use a SelectionModel as shown in
http://gwt.google.com/samples/Showcase/Showcase.html#!CwCellList
I'm inclined to put SelectionModel in the presenter since it's a model, not
a widget. And CellTable et al implement non-widget interfaces so you can
safely reference them in the view interface like this:
HasData<SomeProxy> getSomeProxyDisplay();
then in your presenter:
view.getSomeProxyDisplay().setSelectionModel(...);
The listwidget sample project is at http://code.google.com/p/listwidget/
HTH,
/dmc
On Fri, Jan 14, 2011 at 8:56 PM, rlhawk1 <[email protected]> wrote:
> I'm trying to create a CellTable where when you click on a row, it
> goes to another screen, and I'm trying to keep a correct MVP
> architecture.
>
> I have two questions. First, do I initialize my CellTable in the
> view, or the presenter?
>
> Right now I have something like this in my view code, but with more
> columns.
>
> TextColumn<LightOwner> nameColumn = new TextColumn<LightOwner>() {
> public String getValue(LightOwner o) {
> return o.getName();
> }
> };
> ownersTable.addColumn(nameColumn, "Name");
>
> It works fine, but is it okay for the view to be knowing about my
> LightOwner type like that.
>
> Secondly, I need it to bring up the owner edit screen for the id of
> the row clicked when they click on a row. Reading around, it /sounds/
> like I need to use the SelectionModel class for this, but I'm unsure
> rather that should be in the presenter or view also.
>
> By their example, I need to add code something like this:
>
> final SingleSelectionModel<String> selectionModel = new
> SingleSelectionModel<String>();
> ownersTable.setSelectionModel(selectionModel);
> selectionModel.addSelectionChangeHandler(new
> SelectionChangeEvent.Handler() {
> public void onSelectionChange(SelectionChangeEvent event) {
> String selected = selectionModel.getSelectedObject();
> if (selected != null) {
> // Go to edit screen with selected.getId();
> }
> }
> });
>
> But what I'm used to is having a HasClickHandlers in the view and
> attaching the event in the presenter. How am I supposed to use
> SingleSelectionModel with MVP? Or am I going about this totally wrong?
>
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--
David Chandler
Developer Programs Engineer, Google Web Toolkit
w: http://code.google.com/
b: http://googlewebtoolkit.blogspot.com/
t: @googledevtools
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