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Home » Eclipse Projects » Plugin Development Environment (PDE) » Should I set ScrolledComposite content twice? How to use ScrolledComposite correctly?
Should I set ScrolledComposite content twice? How to use ScrolledComposite correctly? [message #1234422] Tue, 21 January 2014 23:53
Dims Mising name is currently offline Dims Mising nameFriend
Messages: 14
Registered: August 2010
Junior Member
How to use ScrolledComposite correctly?

The following is slightly modified Snipped166:

import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet166 {

public static void main(String[] args) {
	Display display = new Display();
	Image image1 = display.getSystemImage(SWT.ICON_WORKING);
	Image image2 = display.getSystemImage(SWT.ICON_QUESTION);
	Image image3 = display.getSystemImage(SWT.ICON_ERROR);
	
	Shell shell = new Shell(display);
	shell.setLayout(new FillLayout());
	
	final ScrolledComposite scrollComposite = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.BORDER);

	final Composite parent = new Composite(scrollComposite, SWT.NONE);
	for(int i = 0; i <= 50; i++) {
		Label label = new Label(parent, SWT.NONE);
		if (i % 3 == 0) label.setImage(image1);
		if (i % 3 == 1) label.setImage(image2);
		if (i % 3 == 2) label.setImage(image3);
	}
	RowLayout layout = new RowLayout(SWT.HORIZONTAL);
	layout.wrap = false;
	parent.setLayout(layout);
	
	scrollComposite.setContent(parent);
	scrollComposite.setExpandVertical(true);
	scrollComposite.setExpandHorizontal(true);
	scrollComposite.addControlListener(new ControlAdapter() {
		@Override
		public void controlResized(ControlEvent e) {
			Rectangle r = scrollComposite.getClientArea();
			scrollComposite.setMinSize(parent.computeSize(r.width, SWT.DEFAULT));
		}
	});

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


I would like it to display long horizontal row of signs with horizontal scroll bars.

Unfortunately it doesn't draw scroll bars.

Also I don't understand, why this example should be so complex? Why can't I just put something big onto ScrolledComposite and roll?

Also I don't understand the need of `setContent()` method since content is always set in constructor in SWT.
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