Description Arnaud 2007-10-23 05:18:22 EDT

Build ID: M20070212-1330

Steps To Reproduce:
Uses the snippet provided in More Information area (see below).
Launch the snippet.
When focus control is on one of check button, push button or text on the right the MouseWheel events doesn't works.
Events seems to be consumed by the ScrolledComposite parent's of those widget even if this composite have no scrollbar.

In that case MouseWheel events, as thay produce no action, should be passed to ScrolledComposite parent's.
In this snippet this will scrolls the outer ScrolledComposite which display the vertical scrollbar on the right.

Please note, when focus is on the List (on the left), MouseWheel scrolls the list as expected. 
When the focus in on Add or Remove button (on the center),
MouseWheel events scrolls then outer Scrolledcomposite as expected.

Note also that many browser passe MouseWheel events to parent's composite when the scrollbar is at min or max location (the case for IE).


More information:
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;

public class TestMouseWheel2 
{
	 public static void main(String[]args)
	 {
			final Display display = new Display();
			final Shell shell = new Shell(display);
			shell.setLayout( new GridLayout() );
			shell.setText("MouseWheel test");

			ScrolledComposite sc = new ScrolledComposite( shell, SWT.H_SCROLL|SWT.V_SCROLL );
			sc.setLayout( new GridLayout() );
			sc.setLayoutData( new GridData( GridData.FILL_BOTH|GridData.GRAB_HORIZONTAL|GridData.GRAB_VERTICAL ));
			
					
			Composite cn0 = new Composite( sc, SWT.NONE );
			sc.setContent( cn0 );
			cn0.setLayout( new GridLayout() );
			cn0.setLayoutData( new GridData(GridData.FILL_BOTH));
			
			Composite cn = new Composite( cn0, SWT.NONE );
			cn.setLayout( new GridLayout(3,false) );
			List list = new List( cn, SWT.H_SCROLL|SWT.V_SCROLL );
			list.setItems( new String[]{"Value 1","Value........ 2","Value ...........ooOOOO|OOOOoo...... 3"} );
			GridData gd = new GridData(GridData.GRAB_VERTICAL|GridData.FILL_VERTICAL);
			gd.widthHint = 75 ;
			list.setLayoutData( gd );
			
			Composite cb = new Composite( cn, SWT.NONE );
			cb.setLayout( new GridLayout() );
			(new Button(cb,SWT.PUSH)).setText("Add");
			(new Button(cb,SWT.PUSH)).setText("Remove");
			cb.setLayoutData( new GridData(GridData.VERTICAL_ALIGN_BEGINNING));
			
			ScrolledComposite sc2 = new ScrolledComposite( cn, SWT.H_SCROLL );//|SWT.V_SCROLL );
			sc2.setLayout( new GridLayout() );
			sc2.setLayoutData( new GridData( GridData.FILL_BOTH|GridData.GRAB_HORIZONTAL ));

			Composite cn2 = new Composite( sc2, SWT.NONE );
			sc2.setContent( cn2 );
			cn2.setLayout( new GridLayout());
			cn2.setLayoutData( new GridData( GridData.FILL_BOTH|GridData.GRAB_HORIZONTAL));
			(new Button(cn2,SWT.CHECK)).setText("Here is a pretty check button");
			(new Button(cn2,SWT.PUSH)).setText("There a pushable button vefry smart");
			Text txt = new Text(cn2,SWT.SINGLE|SWT.BORDER);
			txt.setText("Now a little text.");
			txt.setLayoutData( new GridData(GridData.FILL_HORIZONTAL));
			
			sc2.setExpandHorizontal(true);
			sc2.setExpandVertical(false);
			Point size  = cn2.computeSize(SWT.DEFAULT, SWT.DEFAULT);
			cn2.setSize( size );
			sc2.setMinSize( size );
			size.x = size.x-30;
			
			//allow h_scroll of 2nd Scrolledcomposite to appear when resizing down shell.
			gd = new GridData( GridData.FILL_BOTH );
			gd.widthHint = 300 ;
			cn.setLayoutData( gd );

			
			sc.setExpandHorizontal(true);
			sc.setExpandVertical(false);
			size  = cn0.computeSize(SWT.DEFAULT, SWT.DEFAULT);
			cn0.setSize( size );
			sc.setMinSize( size );
			
			shell.setSize(450, 150);
			shell.open();
			
			while (!shell.isDisposed()) {
				if (!display.readAndDispatch())
					display.sleep();
			}
			display.dispose();
		}
}