[news.eclipse.platform.jface] JFace Modeless Dialog

[venkataramanam@xxxxxxxxx (venkataramana madugundu)]

Thought this can be helpful to anyone who wants to make existing dialogs 
as modeless but without breaking any code which assumes that Dialog::open 
does not return to caller till the dialog is closed.

package yourpackage;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

/**
* This acts as a modeless dialog. Essentially this has following 
characteristics...
* - Lets the user interact with other UI when this dialog is open
* - Call to open() does not return control to the caller till the dialog 
is closed by OK/Cancel etc.,
*/
public class ModelessDialog extends Dialog
{
	public ModelessDialog(Shell parentShell) {
		super(parentShell);
		setBlockOnOpen(false);
	}
	
	protected void setShellStyle(int newShellStyle) 
	{	
		int newstyle = newShellStyle & ~SWT.APPLICATION_MODAL; /* turn off 
APPLICATION_MODAL */
		newstyle |= SWT.MODELESS; /* turn on MODELESS */
		
		super.setShellStyle(newstyle); 
	}
	
	public int open() 
	{
		int retVal = super.open();
		pumpMessages(); /* this will let the caller wait till OK, Cancel is 
pressed, but
		 				will let the other GUI responsive */
		return retVal;
	}
	
	protected void pumpMessages() 
	{
		Shell sh = getShell();		
		Display disp = sh.getDisplay(); 		
		while( !sh.isDisposed() ) {
			if( !disp.readAndDispatch() ) disp.sleep();
		}
		disp.update();
	}
}

Thanks,
Venkat