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Will there be a fix for ... [message #4551]

Fri, 02 November 2007 22:36

Chris Kwon Lewis

Messages: 24
Registered: July 2009

Junior Member

Will there be a fix for letting you use JOptionPane and JDialogs(etc) ?

I noticed if I use JOptionPane BEFORE creating my EmbeddedSwingComposite
it works just fine. But if I attempt to use JOptionPane or a JDialog
after I've created the EmbeddedSwingComposite that it will display, but
it tends to freeze the whole program.

Not sure if you were aware of this problem, but it would be nice to be
able to use JOptionPane, and in my case a JDialog since the person
before me wrote a lot of code for that particular section which uses a
JDialog and JTrees. Initially i thought the problem was setting the
JDialog's frame owner to the awt frame in EmbeddedSwingComposite. But I
experimented with a regular JOptionPane(doesn't ask for the parent
component/frame) and noticed the same problem.

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Re: Will there be a fix for ... [message #4621 is a reply to message #4551]

Mon, 05 November 2007 13:23

Eclipse User

Originally posted by: canadianguy.gmail.com

You may need to provide a little more information. I know that I have
successfully used JOptionPane and JDialogs both before and after creating
EmbeddedSwingComposites. The code I am working from is modified from
Gordon's original article code.

Originally I was often having this problem when an invisible dialog was
added to the SwtInputBlocker... but I believe the fix for that one has since
been applied to the sample code.

I would also suspect that you are getting pop-under windows (your swing
window could be trapped behind your SWT Window) but it is hard to say. You
could also try the changes Gordon and I discuss in the September 19th post
to this group.

In short, I would hazard a guess that compatibility issues such as this are
vital to the project and will eventually be worked out.

-James

"Cklewis" <chriskwonlewis@msn.com> wrote in message
news:fgg8p4$5ko$1@build.eclipse.org...
> Will there be a fix for letting you use JOptionPane and JDialogs(etc) ?
>
> I noticed if I use JOptionPane BEFORE creating my EmbeddedSwingComposite
> it works just fine. But if I attempt to use JOptionPane or a JDialog
> after I've created the EmbeddedSwingComposite that it will display, but
> it tends to freeze the whole program.
>
> Not sure if you were aware of this problem, but it would be nice to be
> able to use JOptionPane, and in my case a JDialog since the person
> before me wrote a lot of code for that particular section which uses a
> JDialog and JTrees. Initially i thought the problem was setting the
> JDialog's frame owner to the awt frame in EmbeddedSwingComposite. But I
> experimented with a regular JOptionPane(doesn't ask for the parent
> component/frame) and noticed the same problem.

Report message to a moderator

Re: Will there be a fix for ... [message #4689 is a reply to message #4621]

Wed, 07 November 2007 16:32

Chris Kwon Lewis

Messages: 24
Registered: July 2009

Junior Member

I just wrote a seperate program to test if the error was still happening
and it is.

Here is exactly what i'm doing.

1)Create a Shell, set layout etc
2)Try JOptionPane.showInputDialog (works fine)
3)Create swing component (a piccolo "canvas", which is an extended
JComponent)
4)Add my EmbeddedSwingComposite
5)Let the GUI load
6)Click on "file" menu and click on an item I have preset with an action
lisener to call a function that loads another JOptionPane.showInputDialog

The result is the first JoptionPane is fine, but the second one freezes
the entire program as soon as I click a button.

If you would like, I could upload the project so you can try it. It's
just one file along with the folder with all the swing integration stuff
from Gordon's example.

James Peltzer wrote:
> You may need to provide a little more information. I know that I have
> successfully used JOptionPane and JDialogs both before and after creating
> EmbeddedSwingComposites. The code I am working from is modified from
> Gordon's original article code.
>
> Originally I was often having this problem when an invisible dialog was
> added to the SwtInputBlocker... but I believe the fix for that one has since
> been applied to the sample code.
>
> I would also suspect that you are getting pop-under windows (your swing
> window could be trapped behind your SWT Window) but it is hard to say. You
> could also try the changes Gordon and I discuss in the September 19th post
> to this group.
>
> In short, I would hazard a guess that compatibility issues such as this are
> vital to the project and will eventually be worked out.
>
> -James
>
> "Cklewis" <chriskwonlewis@msn.com> wrote in message
> news:fgg8p4$5ko$1@build.eclipse.org...
>> Will there be a fix for letting you use JOptionPane and JDialogs(etc) ?
>>
>> I noticed if I use JOptionPane BEFORE creating my EmbeddedSwingComposite
>> it works just fine. But if I attempt to use JOptionPane or a JDialog
>> after I've created the EmbeddedSwingComposite that it will display, but
>> it tends to freeze the whole program.
>>
>> Not sure if you were aware of this problem, but it would be nice to be
>> able to use JOptionPane, and in my case a JDialog since the person
>> before me wrote a lot of code for that particular section which uses a
>> JDialog and JTrees. Initially i thought the problem was setting the
>> JDialog's frame owner to the awt frame in EmbeddedSwingComposite. But I
>> experimented with a regular JOptionPane(doesn't ask for the parent
>> component/frame) and noticed the same problem.
>
>

Report message to a moderator

Re: Will there be a fix for ... [message #4758 is a reply to message #4689]

Thu, 08 November 2007 19:56

Gordon Hirsch

Messages: 100
Registered: July 2009

Senior Member

If you make your example available, I can take a look. There's no
specific problem that I know of with JOptionPane, and I have
successfully used JOptionPane dialogs in the past.

Cklewis wrote:
> I just wrote a seperate program to test if the error was still happening
> and it is.
>
> Here is exactly what i'm doing.
>
> 1)Create a Shell, set layout etc
> 2)Try JOptionPane.showInputDialog (works fine)
> 3)Create swing component (a piccolo "canvas", which is an extended
> JComponent)
> 4)Add my EmbeddedSwingComposite
> 5)Let the GUI load
> 6)Click on "file" menu and click on an item I have preset with an action
> lisener to call a function that loads another JOptionPane.showInputDialog
>
> The result is the first JoptionPane is fine, but the second one freezes
> the entire program as soon as I click a button.
>
> If you would like, I could upload the project so you can try it. It's
> just one file along with the folder with all the swing integration stuff
> from Gordon's example.
>
> James Peltzer wrote:
>> You may need to provide a little more information. I know that I have
>> successfully used JOptionPane and JDialogs both before and after creating
>> EmbeddedSwingComposites. The code I am working from is modified from
>> Gordon's original article code.
>>
>> Originally I was often having this problem when an invisible dialog was
>> added to the SwtInputBlocker... but I believe the fix for that one has
>> since
>> been applied to the sample code.
>>
>> I would also suspect that you are getting pop-under windows (your swing
>> window could be trapped behind your SWT Window) but it is hard to
>> say. You
>> could also try the changes Gordon and I discuss in the September 19th
>> post
>> to this group.
>>
>> In short, I would hazard a guess that compatibility issues such as
>> this are
>> vital to the project and will eventually be worked out.
>>
>> -James
>>
>> "Cklewis" <chriskwonlewis@msn.com> wrote in message
>> news:fgg8p4$5ko$1@build.eclipse.org...
>>> Will there be a fix for letting you use JOptionPane and JDialogs(etc) ?
>>>
>>> I noticed if I use JOptionPane BEFORE creating my EmbeddedSwingComposite
>>> it works just fine. But if I attempt to use JOptionPane or a JDialog
>>> after I've created the EmbeddedSwingComposite that it will display, but
>>> it tends to freeze the whole program.
>>>
>>> Not sure if you were aware of this problem, but it would be nice to be
>>> able to use JOptionPane, and in my case a JDialog since the person
>>> before me wrote a lot of code for that particular section which uses a
>>> JDialog and JTrees. Initially i thought the problem was setting the
>>> JDialog's frame owner to the awt frame in EmbeddedSwingComposite. But I
>>> experimented with a regular JOptionPane(doesn't ask for the parent
>>> component/frame) and noticed the same problem.
>>
>>

Report message to a moderator

Re: Will there be a fix for ... [message #4833 is a reply to message #4758]

Thu, 08 November 2007 20:40

Chris Kwon Lewis

Messages: 24
Registered: July 2009

Junior Member

This is a multi-part message in MIME format.
--------------040206060602040709030109
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Here is the example (attached),

click on 'file' -> 'try me' to get the 2nd JOptionPane to come up...
this way the gui and embedded swing composite are already loaded when it
comes up.

You also need the piccolo library to get this project to work.
downloadable at:
http://www.cs.umd.edu/hcil/jazz/download/piccolo/piccolo-1.2 .zip

you can add the piccolo jars or put the piccolo portion as a project and
link via a buildpath.

Gordon Hirsch wrote:
> If you make your example available, I can take a look. There's no
> specific problem that I know of with JOptionPane, and I have
> successfully used JOptionPane dialogs in the past.
>
> Cklewis wrote:
>> I just wrote a seperate program to test if the error was still
>> happening and it is.
>>
>> Here is exactly what i'm doing.
>>
>> 1)Create a Shell, set layout etc
>> 2)Try JOptionPane.showInputDialog (works fine)
>> 3)Create swing component (a piccolo "canvas", which is an extended
>> JComponent)
>> 4)Add my EmbeddedSwingComposite
>> 5)Let the GUI load
>> 6)Click on "file" menu and click on an item I have preset with an
>> action lisener to call a function that loads another
>> JOptionPane.showInputDialog
>>
>> The result is the first JoptionPane is fine, but the second one
>> freezes the entire program as soon as I click a button.
>>
>> If you would like, I could upload the project so you can try it. It's
>> just one file along with the folder with all the swing integration
>> stuff from Gordon's example.
>>
>> James Peltzer wrote:
>>> You may need to provide a little more information. I know that I have
>>> successfully used JOptionPane and JDialogs both before and after
>>> creating
>>> EmbeddedSwingComposites. The code I am working from is modified from
>>> Gordon's original article code.
>>>
>>> Originally I was often having this problem when an invisible dialog was
>>> added to the SwtInputBlocker... but I believe the fix for that one
>>> has since
>>> been applied to the sample code.
>>>
>>> I would also suspect that you are getting pop-under windows (your swing
>>> window could be trapped behind your SWT Window) but it is hard to
>>> say. You
>>> could also try the changes Gordon and I discuss in the September 19th
>>> post
>>> to this group.
>>>
>>> In short, I would hazard a guess that compatibility issues such as
>>> this are
>>> vital to the project and will eventually be worked out.
>>>
>>> -James
>>>
>>> "Cklewis" <chriskwonlewis@msn.com> wrote in message
>>> news:fgg8p4$5ko$1@build.eclipse.org...
>>>> Will there be a fix for letting you use JOptionPane and JDialogs(etc) ?
>>>>
>>>> I noticed if I use JOptionPane BEFORE creating my
>>>> EmbeddedSwingComposite
>>>> it works just fine. But if I attempt to use JOptionPane or a JDialog
>>>> after I've created the EmbeddedSwingComposite that it will display, but
>>>> it tends to freeze the whole program.
>>>>
>>>> Not sure if you were aware of this problem, but it would be nice to be
>>>> able to use JOptionPane, and in my case a JDialog since the person
>>>> before me wrote a lot of code for that particular section which uses a
>>>> JDialog and JTrees. Initially i thought the problem was setting the
>>>> JDialog's frame owner to the awt frame in EmbeddedSwingComposite.
>>>> But I
>>>> experimented with a regular JOptionPane(doesn't ask for the parent
>>>> component/frame) and noticed the same problem.
>>>
>>>

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Re: Will there be a fix for ... [message #4904 is a reply to message #4833]

Sat, 10 November 2007 22:47

Gordon Hirsch

Messages: 100
Registered: July 2009

Senior Member

Hi Chris,

The problem you are seeing is because JOptionPane.showInputDialog is
being called from a thread other than the AWT event thread. In this
case, you are making the call instead from the SWT event thread. (Since
the main menu is an SWT menu, the listener is called by SWT from within
its event handling loop.)

To avoid deadlocks and other problems, it's important that most calls to
the AWT/Swing APIs be made from within the AWT event thread. This is
actually a general rule, not just for the case of mixing SWT and Swing.
It's called the single-thread rule. More info:
http://java.sun.com/products/jfc/tsc/articles/threads/thread s1.html.

(SWT also has this rule and enforces it much more strictly.)

To solve the problem, you just need to transfer control to the AWT event
thread and show the dialog from there. Since you're using article code,
the easiest way to do this, is to change the tryme() method to:

public void tryMe(){
AwtEnvironment.getInstance(display).invokeAndBlockSwt(new Runnable() {
public void run() {
JOptionPane.showInputDialog("after");
}
});
}

You can also use AWT APIs directly:

public void tryMe(){
EventQueue.invokeLater(new Runnable() {
public void run() {
JOptionPane.showInputDialog("after");
}
});}

However, this code does not block SWT during the brief period between
the call to invokeLater and the eventual call to showInputDialog on the
AWT thread. So the first example is preferable.

Cklewis wrote:
> Here is the example (attached),
>
> click on 'file' -> 'try me' to get the 2nd JOptionPane to come up...
> this way the gui and embedded swing composite are already loaded when it
> comes up.
>
> You also need the piccolo library to get this project to work.
> downloadable at:
> http://www.cs.umd.edu/hcil/jazz/download/piccolo/piccolo-1.2 .zip
>
> you can add the piccolo jars or put the piccolo portion as a project and
> link via a buildpath.
>
> Gordon Hirsch wrote:
>> If you make your example available, I can take a look. There's no
>> specific problem that I know of with JOptionPane, and I have
>> successfully used JOptionPane dialogs in the past.
>>
>> Cklewis wrote:
>>> I just wrote a seperate program to test if the error was still
>>> happening and it is.
>>>
>>> Here is exactly what i'm doing.
>>>
>>> 1)Create a Shell, set layout etc
>>> 2)Try JOptionPane.showInputDialog (works fine)
>>> 3)Create swing component (a piccolo "canvas", which is an extended
>>> JComponent)
>>> 4)Add my EmbeddedSwingComposite
>>> 5)Let the GUI load
>>> 6)Click on "file" menu and click on an item I have preset with an
>>> action lisener to call a function that loads another
>>> JOptionPane.showInputDialog
>>>
>>> The result is the first JoptionPane is fine, but the second one
>>> freezes the entire program as soon as I click a button.
>>>
>>> If you would like, I could upload the project so you can try it. It's
>>> just one file along with the folder with all the swing integration
>>> stuff from Gordon's example.
>>>
>>> James Peltzer wrote:
>>>> You may need to provide a little more information. I know that I have
>>>> successfully used JOptionPane and JDialogs both before and after
>>>> creating
>>>> EmbeddedSwingComposites. The code I am working from is modified from
>>>> Gordon's original article code.
>>>>
>>>> Originally I was often having this problem when an invisible dialog was
>>>> added to the SwtInputBlocker... but I believe the fix for that one
>>>> has since
>>>> been applied to the sample code.
>>>>
>>>> I would also suspect that you are getting pop-under windows (your swing
>>>> window could be trapped behind your SWT Window) but it is hard to
>>>> say. You
>>>> could also try the changes Gordon and I discuss in the September
>>>> 19th post
>>>> to this group.
>>>>
>>>> In short, I would hazard a guess that compatibility issues such as
>>>> this are
>>>> vital to the project and will eventually be worked out.
>>>>
>>>> -James
>>>>
>>>> "Cklewis" <chriskwonlewis@msn.com> wrote in message
>>>> news:fgg8p4$5ko$1@build.eclipse.org...
>>>>> Will there be a fix for letting you use JOptionPane and
>>>>> JDialogs(etc) ?
>>>>>
>>>>> I noticed if I use JOptionPane BEFORE creating my
>>>>> EmbeddedSwingComposite
>>>>> it works just fine. But if I attempt to use JOptionPane or a JDialog
>>>>> after I've created the EmbeddedSwingComposite that it will display,
>>>>> but
>>>>> it tends to freeze the whole program.
>>>>>
>>>>> Not sure if you were aware of this problem, but it would be nice to be
>>>>> able to use JOptionPane, and in my case a JDialog since the person
>>>>> before me wrote a lot of code for that particular section which uses a
>>>>> JDialog and JTrees. Initially i thought the problem was setting the
>>>>> JDialog's frame owner to the awt frame in EmbeddedSwingComposite.
>>>>> But I
>>>>> experimented with a regular JOptionPane(doesn't ask for the parent
>>>>> component/frame) and noticed the same problem.
>>>>
>>>>
>

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Re: Will there be a fix for ... [message #4973 is a reply to message #4904]

Tue, 13 November 2007 18:39

Chris Kwon Lewis

Messages: 24
Registered: July 2009

Junior Member

That worked perfectly. I was a bit confused because the JOptionPane
seemed to work if there wasn't an embedded swing composite in there. I
remember your tutorial mentioning things about using different threads
for different things, but I wasn't sure in which cases to exactly use them.

This also fixed a delay problem I had in my program when I was scaling
after I strictly used the AWT thread for that part. I'm a bit confused
though because I don't make the AWT thread draw on the swing canvas, but
the performance seems to still be good and no type of invalid thread
access or other errors.

Thanks again for your help and insight.

Gordon Hirsch wrote:
> Hi Chris,
>
> The problem you are seeing is because JOptionPane.showInputDialog is
> being called from a thread other than the AWT event thread. In this
> case, you are making the call instead from the SWT event thread. (Since
> the main menu is an SWT menu, the listener is called by SWT from within
> its event handling loop.)
>
> To avoid deadlocks and other problems, it's important that most calls to
> the AWT/Swing APIs be made from within the AWT event thread. This is
> actually a general rule, not just for the case of mixing SWT and Swing.
> It's called the single-thread rule. More info:
> http://java.sun.com/products/jfc/tsc/articles/threads/thread s1.html.
>
> (SWT also has this rule and enforces it much more strictly.)
>
> To solve the problem, you just need to transfer control to the AWT event
> thread and show the dialog from there. Since you're using article code,
> the easiest way to do this, is to change the tryme() method to:
>
> public void tryMe(){
> AwtEnvironment.getInstance(display).invokeAndBlockSwt(new
> Runnable() {
> public void run() {
> JOptionPane.showInputDialog("after");
> }
> });
> }
>
> You can also use AWT APIs directly:
>
> public void tryMe(){
> EventQueue.invokeLater(new Runnable() {
> public void run() {
> JOptionPane.showInputDialog("after");
> }
> });}
>
> However, this code does not block SWT during the brief period between
> the call to invokeLater and the eventual call to showInputDialog on the
> AWT thread. So the first example is preferable.
>
> Cklewis wrote:
>> Here is the example (attached),
>>
>> click on 'file' -> 'try me' to get the 2nd JOptionPane to come up...
>> this way the gui and embedded swing composite are already loaded when
>> it comes up.
>>
>> You also need the piccolo library to get this project to work.
>> downloadable at:
>> http://www.cs.umd.edu/hcil/jazz/download/piccolo/piccolo-1.2 .zip
>>
>> you can add the piccolo jars or put the piccolo portion as a project
>> and link via a buildpath.
>>
>> Gordon Hirsch wrote:
>>> If you make your example available, I can take a look. There's no
>>> specific problem that I know of with JOptionPane, and I have
>>> successfully used JOptionPane dialogs in the past.
>>>
>>> Cklewis wrote:
>>>> I just wrote a seperate program to test if the error was still
>>>> happening and it is.
>>>>
>>>> Here is exactly what i'm doing.
>>>>
>>>> 1)Create a Shell, set layout etc
>>>> 2)Try JOptionPane.showInputDialog (works fine)
>>>> 3)Create swing component (a piccolo "canvas", which is an extended
>>>> JComponent)
>>>> 4)Add my EmbeddedSwingComposite
>>>> 5)Let the GUI load
>>>> 6)Click on "file" menu and click on an item I have preset with an
>>>> action lisener to call a function that loads another
>>>> JOptionPane.showInputDialog
>>>>
>>>> The result is the first JoptionPane is fine, but the second one
>>>> freezes the entire program as soon as I click a button.
>>>>
>>>> If you would like, I could upload the project so you can try it.
>>>> It's just one file along with the folder with all the swing
>>>> integration stuff from Gordon's example.
>>>>
>>>> James Peltzer wrote:
>>>>> You may need to provide a little more information. I know that I have
>>>>> successfully used JOptionPane and JDialogs both before and after
>>>>> creating
>>>>> EmbeddedSwingComposites. The code I am working from is modified from
>>>>> Gordon's original article code.
>>>>>
>>>>> Originally I was often having this problem when an invisible dialog
>>>>> was
>>>>> added to the SwtInputBlocker... but I believe the fix for that one
>>>>> has since
>>>>> been applied to the sample code.
>>>>>
>>>>> I would also suspect that you are getting pop-under windows (your
>>>>> swing
>>>>> window could be trapped behind your SWT Window) but it is hard to
>>>>> say. You
>>>>> could also try the changes Gordon and I discuss in the September
>>>>> 19th post
>>>>> to this group.
>>>>>
>>>>> In short, I would hazard a guess that compatibility issues such as
>>>>> this are
>>>>> vital to the project and will eventually be worked out.
>>>>>
>>>>> -James
>>>>>
>>>>> "Cklewis" <chriskwonlewis@msn.com> wrote in message
>>>>> news:fgg8p4$5ko$1@build.eclipse.org...
>>>>>> Will there be a fix for letting you use JOptionPane and
>>>>>> JDialogs(etc) ?
>>>>>>
>>>>>> I noticed if I use JOptionPane BEFORE creating my
>>>>>> EmbeddedSwingComposite
>>>>>> it works just fine. But if I attempt to use JOptionPane or a JDialog
>>>>>> after I've created the EmbeddedSwingComposite that it will
>>>>>> display, but
>>>>>> it tends to freeze the whole program.
>>>>>>
>>>>>> Not sure if you were aware of this problem, but it would be nice
>>>>>> to be
>>>>>> able to use JOptionPane, and in my case a JDialog since the person
>>>>>> before me wrote a lot of code for that particular section which
>>>>>> uses a
>>>>>> JDialog and JTrees. Initially i thought the problem was setting the
>>>>>> JDialog's frame owner to the awt frame in EmbeddedSwingComposite.
>>>>>> But I
>>>>>> experimented with a regular JOptionPane(doesn't ask for the parent
>>>>>> component/frame) and noticed the same problem.
>>>>>
>>>>>
>>

Report message to a moderator

Re: Will there be a fix for ... [message #573387 is a reply to message #4551]

Mon, 05 November 2007 13:23

James Peltzer

Messages: 43
Registered: July 2009

Member

You may need to provide a little more information. I know that I have
successfully used JOptionPane and JDialogs both before and after creating
EmbeddedSwingComposites. The code I am working from is modified from
Gordon's original article code.

Originally I was often having this problem when an invisible dialog was
added to the SwtInputBlocker... but I believe the fix for that one has since
been applied to the sample code.

I would also suspect that you are getting pop-under windows (your swing
window could be trapped behind your SWT Window) but it is hard to say. You
could also try the changes Gordon and I discuss in the September 19th post
to this group.

In short, I would hazard a guess that compatibility issues such as this are
vital to the project and will eventually be worked out.

-James

"Cklewis" <chriskwonlewis@msn.com> wrote in message
news:fgg8p4$5ko$1@build.eclipse.org...
> Will there be a fix for letting you use JOptionPane and JDialogs(etc) ?
>
> I noticed if I use JOptionPane BEFORE creating my EmbeddedSwingComposite
> it works just fine. But if I attempt to use JOptionPane or a JDialog
> after I've created the EmbeddedSwingComposite that it will display, but
> it tends to freeze the whole program.
>
> Not sure if you were aware of this problem, but it would be nice to be
> able to use JOptionPane, and in my case a JDialog since the person
> before me wrote a lot of code for that particular section which uses a
> JDialog and JTrees. Initially i thought the problem was setting the
> JDialog's frame owner to the awt frame in EmbeddedSwingComposite. But I
> experimented with a regular JOptionPane(doesn't ask for the parent
> component/frame) and noticed the same problem.

Report message to a moderator

Re: Will there be a fix for ... [message #573401 is a reply to message #4621]

Wed, 07 November 2007 16:32

Chris Kwon Lewis

Messages: 24
Registered: July 2009

Junior Member

Report message to a moderator

Re: Will there be a fix for ... [message #573426 is a reply to message #4689]

Thu, 08 November 2007 19:56

Gordon Hirsch

Messages: 100
Registered: July 2009

Senior Member

Report message to a moderator

Re: Will there be a fix for ... [message #573451 is a reply to message #4758]

Thu, 08 November 2007 20:40

Chris Kwon Lewis

Messages: 24
Registered: July 2009

Junior Member

Report message to a moderator

Re: Will there be a fix for ... [message #573478 is a reply to message #4833]

Sat, 10 November 2007 22:47

Gordon Hirsch

Messages: 100
Registered: July 2009

Senior Member

Hi Chris,

The problem you are seeing is because JOptionPane.showInputDialog is
being called from a thread other than the AWT event thread. In this
case, you are making the call instead from the SWT event thread. (Since
the main menu is an SWT menu, the listener is called by SWT from within
its event handling loop.)

To avoid deadlocks and other problems, it's important that most calls to
the AWT/Swing APIs be made from within the AWT event thread. This is
actually a general rule, not just for the case of mixing SWT and Swing.
It's called the single-thread rule. More info:
http://java.sun.com/products/jfc/tsc/articles/threads/thread s1.html

(SWT also has this rule and enforces it much more strictly.)

To solve the problem, you just need to transfer control to the AWT event
thread and show the dialog from there. Since you're using article code,
the easiest way to do this, is to change the tryme() method to:

public void tryMe(){
AwtEnvironment.getInstance(display).invokeAndBlockSwt(new Runnable() {
public void run() {
JOptionPane.showInputDialog("after");
}
});
}

You can also use AWT APIs directly:

public void tryMe(){
EventQueue.invokeLater(new Runnable() {
public void run() {
JOptionPane.showInputDialog("after");
}
});}

However, this code does not block SWT during the brief period between
the call to invokeLater and the eventual call to showInputDialog on the
AWT thread. So the first example is preferable.

Cklewis wrote:
> Here is the example (attached),
>
> click on 'file' -> 'try me' to get the 2nd JOptionPane to come up...
> this way the gui and embedded swing composite are already loaded when it
> comes up.
>
> You also need the piccolo library to get this project to work.
> downloadable at:
> http://www.cs.umd.edu/hcil/jazz/download/piccolo/piccolo-1.2 .zip
>
> you can add the piccolo jars or put the piccolo portion as a project and
> link via a buildpath.
>
> Gordon Hirsch wrote:
>> If you make your example available, I can take a look. There's no
>> specific problem that I know of with JOptionPane, and I have
>> successfully used JOptionPane dialogs in the past.
>>
>> Cklewis wrote:
>>> I just wrote a seperate program to test if the error was still
>>> happening and it is.
>>>
>>> Here is exactly what i'm doing.
>>>
>>> 1)Create a Shell, set layout etc
>>> 2)Try JOptionPane.showInputDialog (works fine)
>>> 3)Create swing component (a piccolo "canvas", which is an extended
>>> JComponent)
>>> 4)Add my EmbeddedSwingComposite
>>> 5)Let the GUI load
>>> 6)Click on "file" menu and click on an item I have preset with an
>>> action lisener to call a function that loads another
>>> JOptionPane.showInputDialog
>>>
>>> The result is the first JoptionPane is fine, but the second one
>>> freezes the entire program as soon as I click a button.
>>>
>>> If you would like, I could upload the project so you can try it. It's
>>> just one file along with the folder with all the swing integration
>>> stuff from Gordon's example.
>>>
>>> James Peltzer wrote:
>>>> You may need to provide a little more information. I know that I have
>>>> successfully used JOptionPane and JDialogs both before and after
>>>> creating
>>>> EmbeddedSwingComposites. The code I am working from is modified from
>>>> Gordon's original article code.
>>>>
>>>> Originally I was often having this problem when an invisible dialog was
>>>> added to the SwtInputBlocker... but I believe the fix for that one
>>>> has since
>>>> been applied to the sample code.
>>>>
>>>> I would also suspect that you are getting pop-under windows (your swing
>>>> window could be trapped behind your SWT Window) but it is hard to
>>>> say. You
>>>> could also try the changes Gordon and I discuss in the September
>>>> 19th post
>>>> to this group.
>>>>
>>>> In short, I would hazard a guess that compatibility issues such as
>>>> this are
>>>> vital to the project and will eventually be worked out.
>>>>
>>>> -James
>>>>
>>>> "Cklewis" <chriskwonlewis@msn.com> wrote in message
>>>> news:fgg8p4$5ko$1@build.eclipse.org...
>>>>> Will there be a fix for letting you use JOptionPane and
>>>>> JDialogs(etc) ?
>>>>>
>>>>> I noticed if I use JOptionPane BEFORE creating my
>>>>> EmbeddedSwingComposite
>>>>> it works just fine. But if I attempt to use JOptionPane or a JDialog
>>>>> after I've created the EmbeddedSwingComposite that it will display,
>>>>> but
>>>>> it tends to freeze the whole program.
>>>>>
>>>>> Not sure if you were aware of this problem, but it would be nice to be
>>>>> able to use JOptionPane, and in my case a JDialog since the person
>>>>> before me wrote a lot of code for that particular section which uses a
>>>>> JDialog and JTrees. Initially i thought the problem was setting the
>>>>> JDialog's frame owner to the awt frame in EmbeddedSwingComposite.
>>>>> But I
>>>>> experimented with a regular JOptionPane(doesn't ask for the parent
>>>>> component/frame) and noticed the same problem.
>>>>
>>>>
>

Report message to a moderator

Re: Will there be a fix for ... [message #573504 is a reply to message #4904]

Tue, 13 November 2007 18:39

Chris Kwon Lewis

Messages: 24
Registered: July 2009

Junior Member

That worked perfectly. I was a bit confused because the JOptionPane
seemed to work if there wasn't an embedded swing composite in there. I
remember your tutorial mentioning things about using different threads
for different things, but I wasn't sure in which cases to exactly use them.

This also fixed a delay problem I had in my program when I was scaling
after I strictly used the AWT thread for that part. I'm a bit confused
though because I don't make the AWT thread draw on the swing canvas, but
the performance seems to still be good and no type of invalid thread
access or other errors.

Thanks again for your help and insight.

Gordon Hirsch wrote:
> Hi Chris,
>
> The problem you are seeing is because JOptionPane.showInputDialog is
> being called from a thread other than the AWT event thread. In this
> case, you are making the call instead from the SWT event thread. (Since
> the main menu is an SWT menu, the listener is called by SWT from within
> its event handling loop.)
>
> To avoid deadlocks and other problems, it's important that most calls to
> the AWT/Swing APIs be made from within the AWT event thread. This is
> actually a general rule, not just for the case of mixing SWT and Swing.
> It's called the single-thread rule. More info:
> http://java.sun.com/products/jfc/tsc/articles/threads/thread s1.html
>
> (SWT also has this rule and enforces it much more strictly.)
>
> To solve the problem, you just need to transfer control to the AWT event
> thread and show the dialog from there. Since you're using article code,
> the easiest way to do this, is to change the tryme() method to:
>
> public void tryMe(){
> AwtEnvironment.getInstance(display).invokeAndBlockSwt(new
> Runnable() {
> public void run() {
> JOptionPane.showInputDialog("after");
> }
> });
> }
>
> You can also use AWT APIs directly:
>
> public void tryMe(){
> EventQueue.invokeLater(new Runnable() {
> public void run() {
> JOptionPane.showInputDialog("after");
> }
> });}
>
> However, this code does not block SWT during the brief period between
> the call to invokeLater and the eventual call to showInputDialog on the
> AWT thread. So the first example is preferable.
>
> Cklewis wrote:
>> Here is the example (attached),
>>
>> click on 'file' -> 'try me' to get the 2nd JOptionPane to come up...
>> this way the gui and embedded swing composite are already loaded when
>> it comes up.
>>
>> You also need the piccolo library to get this project to work.
>> downloadable at:
>> http://www.cs.umd.edu/hcil/jazz/download/piccolo/piccolo-1.2 .zip
>>
>> you can add the piccolo jars or put the piccolo portion as a project
>> and link via a buildpath.
>>
>> Gordon Hirsch wrote:
>>> If you make your example available, I can take a look. There's no
>>> specific problem that I know of with JOptionPane, and I have
>>> successfully used JOptionPane dialogs in the past.
>>>
>>> Cklewis wrote:
>>>> I just wrote a seperate program to test if the error was still
>>>> happening and it is.
>>>>
>>>> Here is exactly what i'm doing.
>>>>
>>>> 1)Create a Shell, set layout etc
>>>> 2)Try JOptionPane.showInputDialog (works fine)
>>>> 3)Create swing component (a piccolo "canvas", which is an extended
>>>> JComponent)
>>>> 4)Add my EmbeddedSwingComposite
>>>> 5)Let the GUI load
>>>> 6)Click on "file" menu and click on an item I have preset with an
>>>> action lisener to call a function that loads another
>>>> JOptionPane.showInputDialog
>>>>
>>>> The result is the first JoptionPane is fine, but the second one
>>>> freezes the entire program as soon as I click a button.
>>>>
>>>> If you would like, I could upload the project so you can try it.
>>>> It's just one file along with the folder with all the swing
>>>> integration stuff from Gordon's example.
>>>>
>>>> James Peltzer wrote:
>>>>> You may need to provide a little more information. I know that I have
>>>>> successfully used JOptionPane and JDialogs both before and after
>>>>> creating
>>>>> EmbeddedSwingComposites. The code I am working from is modified from
>>>>> Gordon's original article code.
>>>>>
>>>>> Originally I was often having this problem when an invisible dialog
>>>>> was
>>>>> added to the SwtInputBlocker... but I believe the fix for that one
>>>>> has since
>>>>> been applied to the sample code.
>>>>>
>>>>> I would also suspect that you are getting pop-under windows (your
>>>>> swing
>>>>> window could be trapped behind your SWT Window) but it is hard to
>>>>> say. You
>>>>> could also try the changes Gordon and I discuss in the September
>>>>> 19th post
>>>>> to this group.
>>>>>
>>>>> In short, I would hazard a guess that compatibility issues such as
>>>>> this are
>>>>> vital to the project and will eventually be worked out.
>>>>>
>>>>> -James
>>>>>
>>>>> "Cklewis" <chriskwonlewis@msn.com> wrote in message
>>>>> news:fgg8p4$5ko$1@build.eclipse.org...
>>>>>> Will there be a fix for letting you use JOptionPane and
>>>>>> JDialogs(etc) ?
>>>>>>
>>>>>> I noticed if I use JOptionPane BEFORE creating my
>>>>>> EmbeddedSwingComposite
>>>>>> it works just fine. But if I attempt to use JOptionPane or a JDialog
>>>>>> after I've created the EmbeddedSwingComposite that it will
>>>>>> display, but
>>>>>> it tends to freeze the whole program.
>>>>>>
>>>>>> Not sure if you were aware of this problem, but it would be nice
>>>>>> to be
>>>>>> able to use JOptionPane, and in my case a JDialog since the person
>>>>>> before me wrote a lot of code for that particular section which
>>>>>> uses a
>>>>>> JDialog and JTrees. Initially i thought the problem was setting the
>>>>>> JDialog's frame owner to the awt frame in EmbeddedSwingComposite.
>>>>>> But I
>>>>>> experimented with a regular JOptionPane(doesn't ask for the parent
>>>>>> component/frame) and noticed the same problem.
>>>>>
>>>>>
>>

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