[news.eclipse.platform.swt] Re: Adding widgets to a composite after crea

[Qinxian <fyaoxy@xxxxxxxxx>]

Hi,
Yestoday I just try a way: switch parent of composite, but problemed, I 
cannot dare use it:
(Main code)

		client.setLayout(new MigLayout());
		Group g1= new Group(client, SWT.DEFAULT);
		g1.setText("group1");
		g1.setLayout(new MigLayout());
		Group g2= new Group(client, SWT.DEFAULT);
		g2.setText("group2");
		g2.setLayout(new MigLayout());
		
		Text t1 = new Text(g1, SWT.NONE);
		final Label l1 = new Label(g1, SWT.NONE);
		l1.setText("label1");
		final Label l2 = new Label(g2, SWT.NONE);
		l2.setText("label2");
		Text t2 = new Text(g2, SWT.NONE);
		Button b = new Button(client, SWT.PUSH);
		b.setText("change");
		b.addSelectionListener(new SelectionAdapter(){
			@Override
			public void widgetSelected(SelectionEvent e) {
				Composite parent = l1.getParent();
				l1.setParent(l2.getParent());
		l2.getParent().changed(l2.getParent().getChildren());
				l2.setParent(parent);
				parent.changed(parent.getChildren());
				parent.redraw();
			}});
	
At later of the code, changed and redraw call just try to try, soso. No 
effective.
It works in a case: same order. You can change the g1 and t1 order, 
seems works.
I not dig into, why order important? because of LayoutManager or OS 
getChildren, I Not into.
So, After-creation-solution should not an all-right way.Indeed at 
windows My before experiences tell me that it's a real way.:)
But now I not care this way.:)
So, What you want, maybe should a cache solution.But should a Object 
Level cache instead of Class Level cache.
f.e.
class Activity{
BaseContent content;
BaseContent getContent(){return content;}
}

new Activity(){content=new SimpleContent();}//simple content
new Activity(){content = new GroupContent();}//not so simple content

You cannot cache Activity class Form to reuse. If not, error would must 
be occured when switch 2 different activity objects.

haha, I just make noise at this, you see yours.:)

Cheers,
Qinxian

Mark Hibberd åé:
> Adding widgets to a composite after creation.
>
> Does anyone know if it is possible to add more widgets to a composite 
> after creation, say via an action or something similar.
> The basic idea is I need to build up a dynamic form, based on user 
> input. I could use something very generic (something like the 
> PropertySheetView) but I want to be able to add some more advanced input 
> widgets depending on field type etc...
>
> At the moment I have tried what I thought was the most obvious path, 
> which is to store off the parent passed to 'createPartControl' then just 
> use it from the actions like you would normally do during creation (new 
> Label(storedParent, SWT...). But obviously that does not work or I 
> wouldn't have to ask?
>
> Any help appreciated (even if it is to call me stupid and point me at a 
> way simpler way to achieve what I want).