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Home » Eclipse Projects » Standard Widget Toolkit (SWT) » Is there any way to detect a Paste/Cut from within a ModifyListener?
Is there any way to detect a Paste/Cut from within a ModifyListener? [message #465215] Thu, 08 December 2005 11:39 Go to next message
Paul E. Keyser is currently offline Paul E. KeyserFriend
Messages: 878
Registered: July 2009
Senior Member
Or, if there is not (as I suspect, having looked at the fields of ModifyEvent), is there some other
way to detect that the user has pasted-into or cut-from my Text-widget?

I want to save the model when the user makes a "sufficinently large" change; I can and do count
ModifyEvents, which works fine for keystrokes, but when the user pastes or cuts, that is one event,
yet is "large".

Any ideas?

thanks,
Paul
Re: Is there any way to detect a Paste/Cut from within a ModifyListener? [message #465315 is a reply to message #465215] Thu, 08 December 2005 21:40 Go to previous messageGo to next message
Veronika Irvine is currently offline Veronika IrvineFriend
Messages: 1272
Registered: July 2009
Senior Member
Why not look at how many characters have changed in the VerifyEvent - see
VerifyEvent.text, VerifyEvent.start, VerifyEvent.end.

Note that typing one character when a large amount of text is selected will
also result in a significant change in the text.

"Paul Keyser" <rolarenfan@earthlink.net> wrote in message
news:dn961o$f3n$1@news.eclipse.org...
> Or, if there is not (as I suspect, having looked at the fields of
> ModifyEvent), is there some other way to detect that the user has
> pasted-into or cut-from my Text-widget?
>
> I want to save the model when the user makes a "sufficinently large"
> change; I can and do count ModifyEvents, which works fine for keystrokes,
> but when the user pastes or cuts, that is one event, yet is "large".
>
> Any ideas?
>
> thanks,
> Paul
Re: Is there any way to detect a Paste/Cut from within a ModifyListener? [message #465341 is a reply to message #465315] Fri, 09 December 2005 08:36 Go to previous messageGo to next message
Paul E. Keyser is currently offline Paul E. KeyserFriend
Messages: 878
Registered: July 2009
Senior Member
Well, I did not know about VerifyListener, which seems like it could be quite useful -- but when I
attach a VerifyListener to my Text control, it is never called, whether or not I also have a
ModifyListener (which, when attached, *is* called). The javadocs for VerifyListener suggest that
VerifyListener works with Text and requires no special handling. What's up?

thanks,
Paul
Re: Is there any way to detect a Paste/Cut from within a ModifyListener? [message #465342 is a reply to message #465341] Fri, 09 December 2005 08:43 Go to previous messageGo to next message
Paul E. Keyser is currently offline Paul E. KeyserFriend
Messages: 878
Registered: July 2009
Senior Member
Hmmm -- what I said appears to be not quite right: *sometimes* the VerifyListener is called, but on
many keystrokes it is not. When it is called, the results surprised me: only "Select All, then type"
resulted in verifyEvent.end - verifyEvent.start being greater than zero; in particular, no Paste or
Cut event ever seems to generate verifyEvent.end - verifyEvent.start > 0. So I am still puzzled, but
on a higher level than in my prior message.

thanks,
Paul
Re: Is there any way to detect a Paste/Cut from within a ModifyListener? [message #465346 is a reply to message #465342] Fri, 09 December 2005 15:00 Go to previous message
Veronika Irvine is currently offline Veronika IrvineFriend
Messages: 1272
Registered: July 2009
Senior Member
The following works for me for every single key stroke that inserts or
deletes character(s). It also works for menu selections such as cut and
paste and when API on Text is called to change the text (click the button):

public static void main (String [] args) {
Display display = new Display ();
Shell shell = new Shell (display);
shell.setLayout(new FillLayout());
final Text t = new Text(shell, SWT.BORDER | SWT.MULTI);
t.addVerifyListener(new VerifyListener() {
public void verifyText(VerifyEvent e) {
System.out.println("Verify text "+e.start+"
"+e.end+" "+e.text);
}
});
Button b = new Button(shell, SWT.PUSH);
b.setText("insert text");
b.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
t.insert("Hello");
}
});
shell.setSize(300, 300);
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}

"Paul Keyser" <rolarenfan@earthlink.net> wrote in message
news:dnbg4b$m9i$1@news.eclipse.org...
> Hmmm -- what I said appears to be not quite right: *sometimes* the
> VerifyListener is called, but on many keystrokes it is not. When it is
> called, the results surprised me: only "Select All, then type" resulted in
> verifyEvent.end - verifyEvent.start being greater than zero; in
> particular, no Paste or Cut event ever seems to generate verifyEvent.end -
> verifyEvent.start > 0. So I am still puzzled, but on a higher level than
> in my prior message.
>
> thanks,
> Paul
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