Home » Eclipse Projects » Standard Widget Toolkit (SWT) » Are TableViewers incompatible with virtual tables (hard question :)?
| Are TableViewers incompatible with virtual tables (hard question :)? [message #441706] |
Sat, 21 August 2004 21:35  |
 Julen Parra
Messages: 12
Registered: July 2009 |
Junior Member |
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IŽm developer for an Eclipse database plugin (quantum at sourceforge.net).
I'm trying to use the new virtual tables for a database editor. Rob Warner
helped me nicely with my first problem, but now I have another I believe
rather more problematic.
I'm trying to use a TableViewer with the virtual table, and seems to be a
self-defeating proposition. If I define a TableViewer, I need a
IStructuredContentProvider for it, that should define a getElements()
function. This getElements() function should return all the rows data for
all the rows in the table. That quite defeats the purpose of a virtual
table, so a TableViewer should not be used with a virtual table.
So, first, is my analysis correct, or am I missing something ? Second, if
correct, and so cannot use a TableViewer, which would be the direction to
take ?. I want a TableViewer so I can use a CellModifier for my cells.
Basically I want cell editing in my virtual table. Should I develop a
virtual table viewer (gulp) ? Better to concentrate on offering the
editing capability directly to the (virtual) Table object ? If so, any
hints ?
Thanks in advance.
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| Already found a workaround [message #441712 is a reply to message #441706] |
Sun, 22 August 2004 21:32  |
user
Messages: 296
Registered: July 2009 |
Senior Member |
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Hi. I have found a workaround for my problem. That doesn't mean I'm not
curious about the whole thing, but I found that I could use the
TableViewer without making calls to the getElements() function. So I can
use the CellEditors and CellModifier. I don't know if the mix is going
to explode some time in the future, but for now it works OK.
So if anybody knows more about the whole thing, I'm eager to learn, but
the issue it's not blocking me any longer. Thanks for your time :)
Julen Parra wrote:
> IŽm developer for an Eclipse database plugin (quantum at sourceforge.net).
> I'm trying to use the new virtual tables for a database editor. Rob Warner
> helped me nicely with my first problem, but now I have another I believe
> rather more problematic.
>
> I'm trying to use a TableViewer with the virtual table, and seems to be a
> self-defeating proposition. If I define a TableViewer, I need a
> IStructuredContentProvider for it, that should define a getElements()
> function. This getElements() function should return all the rows data for
> all the rows in the table. That quite defeats the purpose of a virtual
> table, so a TableViewer should not be used with a virtual table.
>
> So, first, is my analysis correct, or am I missing something ? Second, if
> correct, and so cannot use a TableViewer, which would be the direction to
> take ?. I want a TableViewer so I can use a CellModifier for my cells.
> Basically I want cell editing in my virtual table. Should I develop a
> virtual table viewer (gulp) ? Better to concentrate on offering the
> editing capability directly to the (virtual) Table object ? If so, any
> hints ?
>
> Thanks in advance.
>
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| Re: Already found a workaround [message #441834 is a reply to message #441712] |
Thu, 26 August 2004 08:39 |
CK Ng
Messages: 18
Registered: July 2009 |
Junior Member |
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May I know how you make use of the ContentProvider & LabelProvider in the
case of TableViewer and SWT.VIRTUAL??
Since it is Virtual, we need to handle the SetData event, my implementation
is as follow where DataModel will update the TableViewer:
tableViewer.getTable().addListener(SWT.SetData, new Listener() {
public void handleEvent(Event event) {
TableItem item = (TableItem) event.item;
final int index = tableViewer.getTable().indexOf(item);
dataModel.updatePacket(index);
}
});
class TableContentProvider implements IStructuredContentProvider,
DataModelListener {
....
public void updateData(final Data data, final int index) {
display.syncExec(
new Runnable() {
public void run(){
if(tableViewer.getTable().isDisposed()) return;
tableViewer.getTable().getItem(index).setData(data);
// tableViewer.insert(data, index);
}
}
);
}
}
The line
tableViewer.getTable().getItem(index).setData(data);
no table item is displayed, I guess it didnt invoke the LabelProvider
somehow
If I use
tableViewer.insert(data, index);
it is giving me wrong index (it skips by returning [0, 2, 4,...]) in the
SetData Listener code
final int index = tableViewer.getTable().indexOf(item);
and evetually will cause ArrayOutOfBound exception
Any suggestion? Or I miss something.
Thanks
Regards,
CK Ng
--
<user@domain.invalid> wrote in message news:cgb38d$mkh$1@eclipse.org...
Hi. I have found a workaround for my problem. That doesn't mean I'm not
curious about the whole thing, but I found that I could use the
TableViewer without making calls to the getElements() function. So I can
use the CellEditors and CellModifier. I don't know if the mix is going
to explode some time in the future, but for now it works OK.
So if anybody knows more about the whole thing, I'm eager to learn, but
the issue it's not blocking me any longer. Thanks for your time :)
Julen Parra wrote:
> I
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| Re: Already found a workaround [message #442702 is a reply to message #441834] |
Sun, 12 September 2004 08:53 |
Julen Parra
Messages: 12
Registered: July 2009 |
Junior Member |
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Sorry for the long time answering, I was out of touch with this newsgroup.
I suppose you have already found your solution, but anyway. I donŽt use
any table content provider. Basically the content is provided by the
SetData event, at least as I see things.
I don't know if I'm answering your question, but when I modify data, and
use the setData() function to modify the data of the TableItem, I have to
use the following line of code (I donŽt know if that's the proper way, but
works sort of, still not tested with all possibilities (deletes and so
on). This line is more or less like a refresh() of the visible items in
the table.
ti.getParent().notifyListeners(SWT.SetData, refresh);
That's about it. If you need more data, please tell me.
CK Ng wrote:
> May I know how you make use of the ContentProvider & LabelProvider in the
> case of TableViewer and SWT.VIRTUAL??
> Since it is Virtual, we need to handle the SetData event, my implementation
> is as follow where DataModel will update the TableViewer:
> tableViewer.getTable().addListener(SWT.SetData, new Listener() {
> public void handleEvent(Event event) {
> TableItem item = (TableItem) event.item;
> final int index = tableViewer.getTable().indexOf(item);
> dataModel.updatePacket(index);
> }
> });
> class TableContentProvider implements IStructuredContentProvider,
> DataModelListener {
> ....
> public void updateData(final Data data, final int index) {
> display.syncExec(
> new Runnable() {
> public void run(){
> if(tableViewer.getTable().isDisposed()) return;
> tableViewer.getTable().getItem(index).setData(data);
> // tableViewer.insert(data, index);
> }
> }
> );
> }
> }
> The line
> tableViewer.getTable().getItem(index).setData(data);
> no table item is displayed, I guess it didnt invoke the LabelProvider
> somehow
> If I use
> tableViewer.insert(data, index);
> it is giving me wrong index (it skips by returning [0, 2, 4,...]) in the
> SetData Listener code
> final int index = tableViewer.getTable().indexOf(item);
> and evetually will cause ArrayOutOfBound exception
> Any suggestion? Or I miss something.
> Thanks
> Regards,
> CK Ng
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