Re: [platform-swt-dev] Creating a form in SWT

[Steve Northover <Steve_Northover@xxxxxxxxxx>]

See http://www.eclipse.org/swt/ for
links to tutorials and various other resources.  Once you get going,
the snippets are worth twice their weight in documentation.

stephan langhammer <langhammerstephan@xxxxxx>
Sent by: platform-swt-dev-bounces@xxxxxxxxxxx

07/13/2007 08:49 PM

Please respond to
"Eclipse Platform SWT component developers list."        <platform-swt-dev@xxxxxxxxxxx>

To	anthony.aziz@xxxxxxxxx, "Eclipse Platform SWT component developers list." <platform-swt-dev@xxxxxxxxxxx>
cc
Subject	Re: [platform-swt-dev] Creating a form in SWT

Am 13.07.2007 um 20:26 schrieb anthonya@xxxxxxxxxxxxxxx:

It seems there is a lack of tutorials for SWT out there,
at least
significantly less than the amazing Swing Tutorial. Anyways
. . . I
was thinking of converting my partially developed app
from Swing to
SWT. I'm currently spending my free time testing out SWT,
however a
have an issue.


I currently have a class, lets say, "AppFrame"


which is something like:


public class AppFrame extends JFrame
{         public AppFrame(String title)
        { 
super(title);


               
// set-up components, etc etc         }


        // methods, etc etc


}

Now, this class is called from a main class, or perhaps
other classes,
or perhaps another project. I know you can't subclass
Shell in SWT.
What is the equivalent way to go about this in SWT.


I'm also on the fence about this approach versus creating
an instance
of JFrame/Shell and doing whatnot that way . . . but my
current
argument is that the Form's behaviour and set-up should
be
encapsulated into itself.

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1. There aren't some good tutorial, but some swt examples
and snippets  form the CVS in Eclipse. Just have a look.

- Swich to the CVS Perspective in Eclipse and add a new
Repository Location :
Host: dev.eclipse.org
Repository Path: /cvsroot/eclipse
user: anonymous
password:
in the Head you could find a lot a stuff around swt, just
have a look at the projects starting with org.eclipse.swt.examples or org.eclipse.swt.snippet


2:Now, you could subclass a Shell and all class inherited
from Widget  in SWT but you have to override the Methode "checkSubclass"
:

Here is a useful link :http://www.eclipse.org/swt/faq.php#subclassing

Just have a look at the question : Why
can't I subclass SWT widgets like Button and Table?


And here is a small example:

import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class
JFrame extends Shell
{
public JFrame() {
// set-up components, etc etc   
}

@Override
protected void
checkSubclass() {
// Disable the check that prevents subclassing
of SWT components
// super.checkSubclass();
}

public static
void main(String[]
args) {
final Display display
= new Display();
final JFrame shell =
new JFrame();
final GridLayout gridLayout
= new GridLayout();
shell.setLayout(gridLayout);
shell.open();

shell.layout();
while (!shell.isDisposed())
{
if (!display.readAndDispatch())
display.sleep();
}
}

}






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