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Disabling the changing of tabs in a CTabFolder. [message #444361]

Tue, 12 October 2004 02:36

Mark Freiheit

Messages: 30
Registered: July 2009

Member

I have a CTabItem with some text boxes on it.
I wish to evaluate the contents of these text boxes and deny the user
the ability to select another tab if an IllegalArgumentException is thrown.

I am confused why this code does not work along those lines...

myFolder.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
try {
mySheet.processFields();
} catch (IllegalArgumentException iae) {
event.doit = false;
}
}
});

Is it because the selection has already occurred by the time the selection
listener is notified?
Any ideas what would accomplish my goal?

Thanks -- Mark

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Re: Disabling the changing of tabs in a CTabFolder. [message #444423 is a reply to message #444361]

Tue, 12 October 2004 15:05

Richard Moore

Messages: 71
Registered: July 2009

Member

Hi,

Try adding the listener to the CTabFolder.. the event source is then the c
tab item

R

"Mark Freiheit" <freiheit@speakeasy.net> wrote in message
news:ckffuv$4hs$1@eclipse.org...
>I have a CTabItem with some text boxes on it.
> I wish to evaluate the contents of these text boxes and deny the user
> the ability to select another tab if an IllegalArgumentException is
> thrown.
>
> I am confused why this code does not work along those lines...
>
> myFolder.addSelectionListener(new SelectionAdapter() {
> public void widgetSelected(SelectionEvent event) {
> try {
> mySheet.processFields();
> } catch (IllegalArgumentException iae) {
> event.doit = false;
> }
> }
> });
>
> Is it because the selection has already occurred by the time the selection
> listener is notified?
> Any ideas what would accomplish my goal?
>
> Thanks -- Mark
>

Report message to a moderator

Re: Disabling the changing of tabs in a CTabFolder. [message #444425 is a reply to message #444361]

Tue, 12 October 2004 15:39

Veronika Irvine

Messages: 1272
Registered: July 2009

Senior Member

The selection event is sent after the selection has changed. The event.doit
field is not referenced by CTabFolder. To block the selection change, you
would need to reset the selection to the previous selection (using
CTabFolder.setSelection) in the Selection event handler. You would need to
remember the old selection index since this is no longer available. This
will probably cause some flicker.

"Mark Freiheit" <freiheit@speakeasy.net> wrote in message
news:ckffuv$4hs$1@eclipse.org...
>I have a CTabItem with some text boxes on it.
> I wish to evaluate the contents of these text boxes and deny the user
> the ability to select another tab if an IllegalArgumentException is
> thrown.
>
> I am confused why this code does not work along those lines...
>
> myFolder.addSelectionListener(new SelectionAdapter() {
> public void widgetSelected(SelectionEvent event) {
> try {
> mySheet.processFields();
> } catch (IllegalArgumentException iae) {
> event.doit = false;
> }
> }
> });
>
> Is it because the selection has already occurred by the time the selection
> listener is notified?
> Any ideas what would accomplish my goal?
>
> Thanks -- Mark
>

Report message to a moderator

Re: Disabling the changing of tabs in a CTabFolder. [message #451034 is a reply to message #444425]

Tue, 22 February 2005 08:57

Omry Yadan

Messages: 45
Registered: July 2009

Member

It seems like disabling the tab item would do the trick in a cleaner
way, but the enhancment request for it was rejected
(https://bugs.eclipse.org/bugs/show_bug.cgi?id=75050)

Veronika Irvine wrote:
> The selection event is sent after the selection has changed. The event.doit
> field is not referenced by CTabFolder. To block the selection change, you
> would need to reset the selection to the previous selection (using
> CTabFolder.setSelection) in the Selection event handler. You would need to
> remember the old selection index since this is no longer available. This
> will probably cause some flicker.
>
> "Mark Freiheit" <freiheit@speakeasy.net> wrote in message
> news:ckffuv$4hs$1@eclipse.org...
>
>>I have a CTabItem with some text boxes on it.
>>I wish to evaluate the contents of these text boxes and deny the user
>>the ability to select another tab if an IllegalArgumentException is
>>thrown.
>>
>>I am confused why this code does not work along those lines...
>>
>> myFolder.addSelectionListener(new SelectionAdapter() {
>> public void widgetSelected(SelectionEvent event) {
>> try {
>> mySheet.processFields();
>> } catch (IllegalArgumentException iae) {
>> event.doit = false;
>> }
>> }
>> });
>>
>>Is it because the selection has already occurred by the time the selection
>>listener is notified?
>>Any ideas what would accomplish my goal?
>>
>>Thanks -- Mark
>>
>
>
>

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