[news.eclipse.platform.swt] ExpandBar and ExpandItem questions

[Nik Bhattacharya <nik_bhat@xxxxxxxxx>]

I really like the look of the ExpandBar and ExpandItem.  However, I want 
to change the colors of the background.  Now I looked at an earlier 
thread in the attachment that was asking about setting the background.

Seems like the bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=131265
has been fixed.  However setting the background on the ExpandBar to a 
different color totally obliterates all the painting operations.

See before and after.  The only difference is that the second image is 
captured when

	expandBar.setBackground(myTancolor)

is called.

I tried setting a background image, but that gets ignored unless 
setBackground is called as well, and in any case the nice rendering of 
the rounded edges and the round up/down button is all lost once 
setBackground is called.

What are my options?  I don't mind writing custom paint operations, but 
I don't see where.

Thanks for any help,

Nik

Snippet below
---------------
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ExpandBar;
import org.eclipse.swt.widgets.ExpandItem;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;


public class ExpandBarComposite extends Composite {

    private ExpandItem networkToolsExpandItem;
    private ExpandItem workflowExpandItem;
    private ExpandItem quickSearchExpandItem;
    private Composite workflowComposite;
    private Composite searchComposite;
    private ExpandBar expandBar;
    private Text text;
    private Composite networkToolsComposite;
    private Image oldImage;
    private Color tanColor;
	/**
	 * Create the composite
	 * @param parent
	 * @param style
	 */
	public ExpandBarComposite(Composite parent, int style) {
		super(parent, style);
		setLayout(new FillLayout());
		createControl(this);
	}
	
	protected void createControl(Composite parent)
	{
		expandBar = new ExpandBar (parent, SWT.NONE);
        //tanColor = new Color(parent.getDisplay(), 207, 196, 177);
        expandBar.setBackground(tanColor);
		Image image = Display.getDefault().getSystemImage(SWT.ICON_INFORMATION);
		
		// First item
		searchComposite = new Composite (expandBar, SWT.NONE);
		GridLayout layout = new GridLayout ();
		layout.numColumns = 2;
		layout.marginLeft = layout.marginTop = layout.marginRight = 
layout.marginBottom = 10;
		layout.verticalSpacing = 10;
		searchComposite.setLayout(layout);

		text = new Text(searchComposite, SWT.BORDER);
		text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
		Button searchButton = new Button (searchComposite, SWT.PUSH);
		searchButton.setText("Search");
		quickSearchExpandItem = new ExpandItem (expandBar, SWT.NONE, 0);
		quickSearchExpandItem.setExpanded(true);
		quickSearchExpandItem.setText("Quick Search");
	 
quickSearchExpandItem.setHeight(searchComposite.computeSize(SWT.DEFAULT, 
SWT.DEFAULT).y);
		quickSearchExpandItem.setControl(searchComposite);
		
		// Second item
		workflowComposite = new Composite (expandBar, SWT.NONE);
		layout = new GridLayout (2, false);
		layout.marginLeft = layout.marginTop = layout.marginRight = 
layout.marginBottom = 10;
		layout.verticalSpacing = 10;
		workflowComposite.setLayout(layout);	
		Label label = new Label (workflowComposite, SWT.NONE);
		final Label importDevicesLabel = new Label (workflowComposite, SWT.NONE);
		importDevicesLabel.setText("Import Devices");
		label = new Label (workflowComposite, SWT.NONE);
		final Label backupDevicesLabel = new Label (workflowComposite, SWT.NONE);
		backupDevicesLabel.setText("Backup Devices");
		label = new Label (workflowComposite, SWT.NONE);
		final Label createAWorkingLabel = new Label (workflowComposite, SWT.NONE);
		createAWorkingLabel.setText("Create a Working Set");
		label = new Label (workflowComposite, SWT.NONE);
		final Label createARuleLabel = new Label (workflowComposite, SWT.NONE);
		createARuleLabel.setText("Create a Rule");
		workflowExpandItem = new ExpandItem (expandBar, SWT.NONE, 1);
		workflowExpandItem.setExpanded(true);
		workflowExpandItem.setText("Workflow Help");
	 
workflowExpandItem.setHeight(workflowComposite.computeSize(SWT.DEFAULT, 
SWT.DEFAULT).y);
		workflowExpandItem.setControl(workflowComposite);
		
		// Third item
		networkToolsExpandItem = new ExpandItem (expandBar, SWT.NONE, 2);
		networkToolsExpandItem.setExpanded(true);
		networkToolsExpandItem.setText("Network Tools");

		networkToolsComposite = new Composite(expandBar, SWT.NONE);
		final GridLayout gridLayout = new GridLayout();
		gridLayout.verticalSpacing = 10;
		gridLayout.numColumns = 2;
		gridLayout.marginBottom = 10;
		networkToolsComposite.setLayout(gridLayout);

		final Label label_1 = new Label(networkToolsComposite, SWT.NONE);

		final Label importDevicesLabel_1 = new Label(networkToolsComposite, 
SWT.NONE);
		importDevicesLabel_1.setText("Ping");

		final Label label_2 = new Label(networkToolsComposite, SWT.NONE);

		final Label backupDevicesLabel_1 = new Label(networkToolsComposite, 
SWT.NONE);
		backupDevicesLabel_1.setText("SSH");

		final Label label_3 = new Label(networkToolsComposite, SWT.NONE);

		final Label createAWorkingLabel_1 = new Label(networkToolsComposite, 
SWT.NONE);
		createAWorkingLabel_1.setText("NS Lookup");

		final Label label_4 = new Label(networkToolsComposite, SWT.NONE);

		final Label createARuleLabel_1 = new Label(networkToolsComposite, 
SWT.NONE);
		createARuleLabel_1.setText("Trace Route");
		

networkToolsExpandItem.setHeight(networkToolsComposite.computeSize(SWT.DEFAULT, 
SWT.DEFAULT).y);
        networkToolsExpandItem.setControl(networkToolsComposite);

		expandBar.setSpacing(8);
	}



	@Override
	public void dispose() {
		super.dispose();
        if(oldImage != null)
        {
            oldImage.dispose();
        }
        if(tanColor != null)
        {
            tanColor.dispose();
        }
	}

	@Override
	protected void checkSubclass() {
		// Disable the check that prevents subclassing of SWT components
	}
	
	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display, SWT.CLOSE);
		shell.setText("Expand bar");
		shell.setLayout(new FillLayout());
		shell.setSize(350, 700);
		ExpandBarComposite composite = new ExpandBarComposite(shell, SWT.FILL);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}

}

--- Begin Message ---

• From: "Tony Lam" <calltl@xxxxxxxxx>
• Date: Thu, 9 Mar 2006 11:57:49 +1100
• Newsgroups: eclipse.platform.swt
• Organization: ANSTO

Hi,

I'm trying out Snippet223 with Eclipse3.2M5a with Windows XP.  Instead of
having the default windows color, I want to set the background of ExpandBar
widget to WHITE.  Then I've added the following codes to Snippet223:

    Color whiteColour = display.getSystemColor(SWT.COLOR_WHITE);
    bar.setBackground(whiteColour);

The result is it has NO effect on ExpandBar.  Is this a bug, something
forbidden, or something I've done wrong with my code?

Regards,
Tony Lam
Australian Nuclear Science and Technology Organisation

--- End Message ---