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multiple top-level shells [message #441747]

Mon, 23 August 2004 14:29

Paul Singleton

Messages: 37
Registered: July 2009

Member

If an SWT app has more than one top-level shell, is this
OK for the event dispatching loop?

while (display.getShells().length > 0) {
if (!display.readAndDispatch ()) {
display.sleep ();
}
}

The Javadoc says that Display#getShells() returns only
*undisposed* shells (unlike, say, Composite#getChildren)

Paul Singleton

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Re: multiple top-level shells [message #442144 is a reply to message #441747]

Fri, 27 August 2004 15:51

Veronika Irvine

Messages: 1272
Registered: July 2009

Senior Member

The problem you could run into is that display is disposed causing
display.getShells() to throw an exception.

The following is better:

while (!display.isDisposed() && display.getShells().length > 0) {
if (!display.readAndDispatch ()) {
display.sleep ();
}
}

"Paul Singleton" <paul@jbgb.com> wrote in message
news:cgcure$eot$1@eclipse.org...
> If an SWT app has more than one top-level shell, is this
> OK for the event dispatching loop?
>
> while (display.getShells().length > 0) {
> if (!display.readAndDispatch ()) {
> display.sleep ();
> }
> }
>
> The Javadoc says that Display#getShells() returns only
> *undisposed* shells (unlike, say, Composite#getChildren)
>
> Paul Singleton
>

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Re: multiple top-level shells [message #442530 is a reply to message #441747]

Tue, 07 September 2004 15:13

Steve Northover

Messages: 1636
Registered: July 2009

Senior Member

This will work however, do you really want to compute the list of shells
between every operating system event? A better solution would be to keep
the shell count yourself.
"Paul Singleton" <paul@jbgb.com> wrote in message
news:cgcure$eot$1@eclipse.org...
> If an SWT app has more than one top-level shell, is this
> OK for the event dispatching loop?
>
> while (display.getShells().length > 0) {
> if (!display.readAndDispatch ()) {
> display.sleep ();
> }
> }
>
> The Javadoc says that Display#getShells() returns only
> *undisposed* shells (unlike, say, Composite#getChildren)
>
> Paul Singleton
>

Report message to a moderator

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