date:20090218

Gwt and Android

2009-02-18 Thread frankCostello


HI,
I want to make an application gwt for android.
Its possible?
In particolar I wanto to  send a photo that are on emulator to an
external server.
How to install an apps gwt on android?
Or the only way is to connect from the browser?
Thanks
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Re[2]: FF vs IE, when dealing with Lists

2009-02-18 Thread Alexey_Tsiunchik


Hello Nick,

Exactly the same issue was in our app. We need to display big lists
(100 - 500) records, and FlexTable seems not solution for this.

The problem is that FlexTable always checks table bounds (row number,
column number) and when you put some value in FlexTable it performs
checking for bounds, moreover it not store the colnum and rownum in
some variables, but always calculate them dynamically. Moreover it
dynamocally adds new rows.
Thats why it becomes slower when number of rows increase.

We had decided to use Grid rather then FlexTable. We can specify Grid
bounds right after creation, and while we put data in cells in the
cycle its performance remains the same for different grid size (here I
mean speed of adding row).

But it also has it's disadvantages. When we need to display another
data in the same Grid, and this data has different number of rows,
we should call Grod.resize(int, int). And for
big grids, this operation is very slow in IE (in our tests resizing
grid with 200 rows, 5 columns, takes ~13000 ms in IE).

So It seems paging here the only solution.

Tuesday, February 17, 2009, 6:40:51 PM, you wrote:

 Ok, I did some more testing and I was wrong.  It's not the inserting
 and removing from lists that are the bottleneck.  I moved the time and
 log statements around and it had to do with adding to the FlexTable
 itself.

 I'm using code like:
 int row = 1;
 for (IteratorMyData iter = eventList.iterator(); iter.hasNext(); row+
 +) {
   long sysTime = System.currentTimeMillis();
   int column = 0;
   MyData event = (MyData)iter.next();

   table.setText(row, column, event.getNameLast());
   column++;

   table.setText(row, column, event.getNameFirst());
   column++;

   table.setText(row, column, event.getJob());
   column++;

   GWT.log(update time 4: +(System.currentTimeMillis()-sysTime)+ms
 , null);
 }

 Now, you can see I'm logging the time after every row is inserted.
 The odd thing I'm seeing is that the time per row increase as rows are
 traversed.  For example, row 1 takes about 30ms but as the rows
 traverse by row 100 each row is taking about 150ms.  It's a steady
 increase.
 Any insights?
 


-- 
Best regards,
 Alexey_Tsiunchikmailto:alexey.tsiunc...@gmail.com


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Image.addClickListener() - BUG?

2009-02-18 Thread RoboHobby


Hi,

We are working on small Java robotics project (www.RoboHobby.com)
And we use GWT as a web-based front end for for remote control for
remote control for our robotics project.
(http://www.robohobby.com/web_remote_control_for_robotics_gwt.jsp)

QUESTION:

It seams that there is a bug in ClickListener handler when you use it
with Image.

The code, like this is not working with GWT 1.5.x.

Image myImage = new Image();
myImage.setUrl( url_to_myImage/myImage.jpg );

myImage.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
//Do something, like:
//myLabel.setText( Hello from 
myImage.addClickListener()!);
}
});

The code like this is work normal way with GWT 1.4.x (1.4.6, etc.).
But it doesn't work with new versions – 1.5.3, 1.5.1, etc.

Do you see such a problems in your projects?
Or, may be there is another reason of such a problem?

addClickListener() works good with Button, but not with Image.

Technically it is possible to use a lot of buttons instead of images,
but the page as a result looks not very good.

Do you see such a bugs in your projects?


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Re: DateTimeFormat problem when deploying to tomcat on unix

2009-02-18 Thread jptard

Just to inform that I resolved my problem including a patch in GWT 1.5
which we can put in parameter the TimeZone (of my server) on the
method DateTimeFormat.format(date, TimeZone),

the patch can be found here:
http://groups.google.com/group/Google-Web-Toolkit-Contributors/browse_thread/thread/bfe963da51824ce0
thanks a lot to the author :)

On Feb 13, 9:02 am, jptard jpt...@gmail.com wrote:
Thanks Pascal...

The application I implemented is to follow command made by our
client... and it's needed to display all the information of the date
(timestamp format) saved on database ...

We have some people working in Maroc and it's them that encountered
'the problem' ... I thought that to force the locale of the
application in the .gwt.xml and in the jsp page with the meta line,
will resolve the problem... it seems that its the case on my
computer.. but not when i deploy the application !

Not easy to manipulate date in informatic !

On Feb 12, 8:54 pm, Pascal zig...@gmail.com wrote:

Bonjour JP,
The problem is not with the DateTimeFormat class. You have to look at
the way dates work in java. A date object is little more than an
offset in milliseconds which happens to be on a give day in the
timezone where the date object has been created. So for example, if
you create it with a calendar object with no time component or
retrieve it from a database date object, it will be at midnight on a
given day. Now, if you send it to the client which is in a time zone
that's behind the server's timezone, it will fall on the previous day.

The way we solved this was to create our own DateDTO for dealing with
dates with no time component. It only captured year, month and day.
Then we do a conversion to Date on the client for rendering.

Note that in another context, the timezone behavior is prettty useful.
If you create a date object on the server that represents 11am, you
send it to the client, which is 2 hours behind, and you render it, you
will see that it now displays 9am which is what the server time is in
local time.

Hope this helps,

Pascal

On Feb 12, 10:44 am, jptard jpt...@gmail.com wrote:

Hello,

I encounter a problem with DateTimeFormat class..., not on my computer
but when my application is deployed on production:

I configured my module to force locale fr_FR like this on my module
properties file:

extend-property name=locale values=fr_FR/

and I put the meta line below on my jsp page:

meta name=gwt:property content=locale=fr_FR/

When I am on my computer with a tomcat server, i can change my
timezone of my computer and my date displayed on the module is the
same each time

When we deployed the application on an unix server, if I change the
timezone of my computer, the date displayed on my module can change :
20/03/2009 instead of 21/03/2009 for example...

I can't understand why.. and spend my day to resolve the problem.. but
with no success...

If anyone has encountered a similar problem and can help me... Thanks
in advance,

JP
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