bundles/org.eclipse.e4.ui.progress/src/org/eclipse/e4/ui/progress/internal/DetailedProgressViewer.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2005, 2015 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.e4.ui.progress.internal;

 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;

 import org.eclipse.e4.ui.progress.IProgressService;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.jface.viewers.ViewerComparator;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.ScrolledComposite;
 import org.eclipse.swt.events.ControlEvent;
 import org.eclipse.swt.events.ControlListener;
 import org.eclipse.swt.events.FocusAdapter;
 import org.eclipse.swt.events.FocusEvent;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Widget;

 /**
  * The DetailedProgressViewer is a viewer that shows the details of all in
  * progress job or jobs that are finished awaiting user input.
  *
  * @since 3.2
  *
  */
 public class DetailedProgressViewer extends AbstractProgressViewer {

 	//Maximum number of entries to display so that the view does not flood the UI with events
 	private static final int MAX_DISPLAYED = 20;

 	Composite control;

 	private ScrolledComposite scrolled;

 	private Composite noEntryArea;

 	private IProgressService progressService;

 	private FinishedJobs finishedJobs;

 	/**
 	 * Create a new instance of the receiver with a control that is a child of
 	 * parent with style style.
 	 *
 	 * @param parent
 	 * @param style
 	 */
 	public DetailedProgressViewer(Composite parent, int style,
 			IProgressService progressService, FinishedJobs finishedJobs) {
 		this.progressService = progressService;
 		this.finishedJobs = finishedJobs;

 		scrolled = new ScrolledComposite(parent, SWT.V_SCROLL | style);
 		int height = JFaceResources.getDefaultFont().getFontData()[0]
 				.getHeight();
 		scrolled.getVerticalBar().setIncrement(height * 2);
 		scrolled.setExpandHorizontal(true);
 		scrolled.setExpandVertical(true);

 		control = new Composite(scrolled, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.marginHeight = 0;
 		layout.marginWidth = 0;
 		control.setLayout(layout);
 		control.setBackground(parent.getDisplay().getSystemColor(
 				SWT.COLOR_LIST_BACKGROUND));

 		control.addFocusListener(new FocusAdapter() {

 			private boolean settingFocus = false;

 			@Override
 			public void focusGained(FocusEvent e) {
 				if (!settingFocus) {
 					// Prevent new focus events as a result this update
 					// occurring
 					settingFocus = true;
 					setFocus();
 					settingFocus = false;
 				}
 			}
 		});

 		control.addControlListener(new ControlListener() {
 			@Override
 			public void controlMoved(ControlEvent e) {
 				updateVisibleItems();

 			}

 			@Override
 			public void controlResized(ControlEvent e) {
 				updateVisibleItems();
 			}
 		});

 		// TODO E4 - missing e4 replacement
 		// PlatformUI.getWorkbench().getHelpSystem().setHelp(control,
 		// IWorkbenchHelpContextIds.RESPONSIVE_UI);

 		scrolled.setContent(control);
 		hookControl(control);

 		noEntryArea = new Composite(scrolled, SWT.NONE);
 		noEntryArea.setLayout(new GridLayout());
 		noEntryArea.setBackground(noEntryArea.getDisplay()
 				.getSystemColor(SWT.COLOR_LIST_BACKGROUND));

 		Label noEntryLabel = new Label(noEntryArea, SWT.NONE);
 		noEntryLabel.setText(ProgressMessages.ProgressView_NoOperations);
 		noEntryLabel.setBackground(noEntryArea.getDisplay().getSystemColor(
 				SWT.COLOR_LIST_BACKGROUND));
 		GridData textData = new GridData(GridData.VERTICAL_ALIGN_BEGINNING);
 		noEntryLabel.setLayoutData(textData);

 		// TODO E4 - missing e4 replacement
 		// PlatformUI.getWorkbench().getHelpSystem().setHelp(noEntryLabel,
 		//		IWorkbenchHelpContextIds.RESPONSIVE_UI);

 	}

 	@Override
 	public void add(Object[] elements) {
 		ViewerComparator sorter = getComparator();

 		// Use a Set in case we are getting something added that exists
 		Set<Object> newItems = new HashSet<>(elements.length);

 		Control[] existingChildren = control.getChildren();
 		for (Control element : existingChildren) {
 			if (element.getData() != null)
 				newItems.add(element.getData());
 		}

 		for (Object element : elements) {
 			if (element != null)
 				newItems.add(element);
 		}

 		JobTreeElement[] infos = new JobTreeElement[newItems.size()];
 		newItems.toArray(infos);

 		if (sorter != null) {
 			sorter.sort(this, infos);
 		}

 		// Update with the new elements to prevent flash
 		for (Control element : existingChildren) {
 			((ProgressInfoItem) element).dispose();
 		}

 		int totalSize = Math.min(newItems.size(), MAX_DISPLAYED);

 		for (int i = 0; i < totalSize; i++) {
 			ProgressInfoItem item = createNewItem(infos[i]);
 			item.setColor(i);
 		}

 		control.layout(true);
 		updateForShowingProgress();
 	}

 	/**
 	 * Update for the progress being displayed.
 	 */
 	private void updateForShowingProgress() {
 		if (control.getChildren().length > 0) {
 			scrolled.setContent(control);
 		} else {
 			scrolled.setContent(noEntryArea);
 		}
 	}

 	/**
 	 * Create a new item for info.
 	 *
 	 * @param info
 	 * @return ProgressInfoItem
 	 */
 	private ProgressInfoItem createNewItem(JobTreeElement info) {
 		final ProgressInfoItem item = new ProgressInfoItem(control, SWT.NONE,
 				info, progressService, finishedJobs);

 		item.addControlListener(new ControlListener() {
 			@Override
 			public void controlMoved(ControlEvent e) {
 				updateVisibleProgressItems(item);
 			}

 			@Override
 			public void controlResized(ControlEvent e) {
 				updateVisibleProgressItems(item);
 			}
 		});

 		item.setIndexListener(new ProgressInfoItem.IndexListener() {
 			@Override
 			public void selectNext() {
 				DetailedProgressViewer.this.selectNext(item);

 			}

 			@Override
 			public void selectPrevious() {
 				DetailedProgressViewer.this.selectPrevious(item);

 			}

 			@Override
 			public void select() {

 				Control[] children = control.getChildren();
 				for (Control element : children) {
 					ProgressInfoItem child = (ProgressInfoItem) element;
 					if (!item.equals(child)) {
 						child.selectWidgets(false);
 					}
 				}
 				item.selectWidgets(true);

 			}
 		});

 		// Refresh to populate with the current tasks
 		item.refresh();
 		return item;
 	}

 	/**
 	 * Select the previous item in the receiver.
 	 *
 	 * @param item
 	 */
 	protected void selectPrevious(ProgressInfoItem item) {
 		Control[] children = control.getChildren();
 		for (int i = 0; i < children.length; i++) {
 			ProgressInfoItem child = (ProgressInfoItem) children[i];
 			if (item.equals(child)) {
 				ProgressInfoItem previous;
 				if (i == 0) {
 					previous = (ProgressInfoItem) children[children.length - 1];
 				} else {
 					previous = (ProgressInfoItem) children[i - 1];
 				}

 				item.selectWidgets(false);
 				previous.selectWidgets(true);
 				return;
 			}
 		}
 	}

 	/**
 	 * Select the next item in the receiver.
 	 *
 	 * @param item
 	 */
 	protected void selectNext(ProgressInfoItem item) {
 		Control[] children = control.getChildren();
 		for (int i = 0; i < children.length; i++) {
 			ProgressInfoItem child = (ProgressInfoItem) children[i];
 			if (item.equals(child)) {
 				ProgressInfoItem next;
 				if (i == children.length - 1) {
 					next = (ProgressInfoItem) children[0];
 				} else {
 					next = (ProgressInfoItem) children[i + 1];
 				}
 				item.selectWidgets(false);
 				next.selectWidgets(true);

 				return;
 			}
 		}

 	}

 	@Override
 	protected Widget doFindInputItem(Object element) {
 		return null;
 	}

 	@Override
 	protected Widget doFindItem(Object element) {
 		Control[] existingChildren = control.getChildren();
 		for (Control controlElement : existingChildren) {
 			if (controlElement.isDisposed()
 					|| controlElement.getData() == null) {
 				continue;
 			}
 			if (controlElement.getData().equals(element)) {
 				return controlElement;
 			}
 		}
 		return null;
 	}

 	@Override
 	protected void doUpdateItem(Widget item, Object element, boolean fullMap) {
 		if (usingElementMap()) {
 			unmapElement(item);
 		}
 		item.dispose();
 		add(new Object[] { element });
 	}

 	@Override
 	public Control getControl() {
 		return scrolled;
 	}

 	@Override
 	protected List<Object> getSelectionFromWidget() {
 		return new ArrayList<>(0);
 	}

 	@Override
 	protected void inputChanged(Object input, Object oldInput) {
 		super.inputChanged(input, oldInput);
 		refreshAll();
 		updateForShowingProgress();
 	}

 	@Override
 	protected void internalRefresh(Object element) {
 		if (element == null) {
 			return;
 		}

 		if (element.equals(getRoot())) {
 			refreshAll();
 			return;
 		}
 		Widget widget = findItem(element);
 		if (widget == null) {
 			add(new Object[] { element });
 			return;
 		}
 		((ProgressInfoItem) widget).refresh();

 		// Update the minimum size
 		Point size = control.computeSize(SWT.DEFAULT, SWT.DEFAULT);
 		// no horizontal size because we do not want to scroll horizontal
 		size.x = 0;
 		size.y += IDialogConstants.VERTICAL_SPACING;

 		scrolled.setMinSize(size);
 	}

 	@Override
 	public void remove(Object[] elements) {

 		for (Object element : elements) {
 			JobTreeElement treeElement = (JobTreeElement) element;
 			// Make sure we are not keeping this one
 			if (finishedJobs.isKept(treeElement)) {
 				Widget item = doFindItem(element);
 				if (item != null) {
 					((ProgressInfoItem) item).refresh();
 				}

 			} else {
 				Widget item = doFindItem(treeElement);
 				if (item == null) {
 					// Is the parent showing?
 					Object parent = treeElement.getParent();
 					if (parent != null)
 						item = doFindItem(parent);
 				}
 				if (item != null) {
 					unmapElement(element);
 					item.dispose();
 				}
 			}
 		}

 		Control[] existingChildren = control.getChildren();
 		for (int i = 0; i < existingChildren.length; i++) {
 			ProgressInfoItem item = (ProgressInfoItem) existingChildren[i];
 			item.setColor(i);
 		}
 		control.layout(true);
 		updateForShowingProgress();
 	}

 	@Override
 	public void reveal(Object element) {

 	}

 	@Override
 	protected void setSelectionToWidget(@SuppressWarnings("rawtypes") List l, boolean reveal) {

 	}

 	/**
 	 * Cancel the current selection
 	 *
 	 */
 	public void cancelSelection() {

 	}

 	/**
 	 * Set focus on the current selection.
 	 *
 	 */
 	public void setFocus() {
 		Control[] children = control.getChildren();
 		if (children.length > 0) {
 			((ProgressInfoItem)children[0]).setButtonFocus();
 		} else {
 			noEntryArea.setFocus();
 		}
 	}

 	/**
 	 * Refresh everything as the root is being refreshed.
 	 */
 	private void refreshAll() {

 		Object[] infos = getSortedChildren(getRoot());
 		Control[] existingChildren = control.getChildren();

 		for (Control element : existingChildren) {
 			element.dispose();

 		}

 		int maxLength = Math.min(infos.length,MAX_DISPLAYED);
 		// Create new ones if required
 		for (int i = 0; i < maxLength; i++) {
 			ProgressInfoItem item = createNewItem((JobTreeElement) infos[i]);
 			item.setColor(i);
 		}

 		control.layout(true);
 		updateForShowingProgress();

 	}

 	/**
 	 * Set the virtual items to be visible or not depending on the displayed
 	 * area.
 	 */
 	private void updateVisibleItems() {
 		updateVisibleProgressItems(control.getChildren());
 	}

 	private void updateVisibleProgressItems(Control... progressInfoItems) {
 		int top = scrolled.getOrigin().y;
 		int bottom = top + scrolled.getParent().getBounds().height;
 		for (Control element : progressInfoItems) {
 			ProgressInfoItem item = (ProgressInfoItem) element;
 			item.setDisplayed(top, bottom);

 		}
 	}

 	public ProgressInfoItem[] getProgressInfoItems() {
 		Control[] children = control.getChildren();
 		ProgressInfoItem[] progressInfoItems = new ProgressInfoItem[children.length];
 		System.arraycopy(children, 0, progressInfoItems, 0, children.length);
 		return progressInfoItems;
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2005, 2015 IBM Corporation and others.
	*
	* This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.e4.ui.progress.internal;

	import java.util.ArrayList;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Set;

	import org.eclipse.e4.ui.progress.IProgressService;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.jface.viewers.ViewerComparator;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.ScrolledComposite;
	import org.eclipse.swt.events.ControlEvent;
	import org.eclipse.swt.events.ControlListener;
	import org.eclipse.swt.events.FocusAdapter;
	import org.eclipse.swt.events.FocusEvent;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Widget;

	/**
	* The DetailedProgressViewer is a viewer that shows the details of all in
	* progress job or jobs that are finished awaiting user input.
	*
	* @since 3.2
	*
	*/
	public class DetailedProgressViewer extends AbstractProgressViewer {

	//Maximum number of entries to display so that the view does not flood the UI with events
	private static final int MAX_DISPLAYED = 20;

	Composite control;

	private ScrolledComposite scrolled;

	private Composite noEntryArea;

	private IProgressService progressService;

	private FinishedJobs finishedJobs;

	/**
	* Create a new instance of the receiver with a control that is a child of
	* parent with style style.
	*
	* @param parent
	* @param style
	*/
	public DetailedProgressViewer(Composite parent, int style,
	IProgressService progressService, FinishedJobs finishedJobs) {
	this.progressService = progressService;
	this.finishedJobs = finishedJobs;

	scrolled = new ScrolledComposite(parent, SWT.V_SCROLL \| style);
	int height = JFaceResources.getDefaultFont().getFontData()[0]
	.getHeight();
	scrolled.getVerticalBar().setIncrement(height * 2);
	scrolled.setExpandHorizontal(true);
	scrolled.setExpandVertical(true);

	control = new Composite(scrolled, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.marginHeight = 0;
	layout.marginWidth = 0;
	control.setLayout(layout);
	control.setBackground(parent.getDisplay().getSystemColor(
	SWT.COLOR_LIST_BACKGROUND));

	control.addFocusListener(new FocusAdapter() {

	private boolean settingFocus = false;

	@Override
	public void focusGained(FocusEvent e) {
	if (!settingFocus) {
	// Prevent new focus events as a result this update
	// occurring
	settingFocus = true;
	setFocus();
	settingFocus = false;
	}
	}
	});

	control.addControlListener(new ControlListener() {
	@Override
	public void controlMoved(ControlEvent e) {
	updateVisibleItems();

	}

	@Override
	public void controlResized(ControlEvent e) {
	updateVisibleItems();
	}
	});

	// TODO E4 - missing e4 replacement
	// PlatformUI.getWorkbench().getHelpSystem().setHelp(control,
	// IWorkbenchHelpContextIds.RESPONSIVE_UI);

	scrolled.setContent(control);
	hookControl(control);

	noEntryArea = new Composite(scrolled, SWT.NONE);
	noEntryArea.setLayout(new GridLayout());
	noEntryArea.setBackground(noEntryArea.getDisplay()
	.getSystemColor(SWT.COLOR_LIST_BACKGROUND));

	Label noEntryLabel = new Label(noEntryArea, SWT.NONE);
	noEntryLabel.setText(ProgressMessages.ProgressView_NoOperations);
	noEntryLabel.setBackground(noEntryArea.getDisplay().getSystemColor(
	SWT.COLOR_LIST_BACKGROUND));
	GridData textData = new GridData(GridData.VERTICAL_ALIGN_BEGINNING);
	noEntryLabel.setLayoutData(textData);

	// TODO E4 - missing e4 replacement
	// PlatformUI.getWorkbench().getHelpSystem().setHelp(noEntryLabel,
	// IWorkbenchHelpContextIds.RESPONSIVE_UI);

	}

	@Override
	public void add(Object[] elements) {
	ViewerComparator sorter = getComparator();

	// Use a Set in case we are getting something added that exists
	Set<Object> newItems = new HashSet<>(elements.length);

	Control[] existingChildren = control.getChildren();
	for (Control element : existingChildren) {
	if (element.getData() != null)
	newItems.add(element.getData());
	}

	for (Object element : elements) {
	if (element != null)
	newItems.add(element);
	}

	JobTreeElement[] infos = new JobTreeElement[newItems.size()];
	newItems.toArray(infos);

	if (sorter != null) {
	sorter.sort(this, infos);
	}

	// Update with the new elements to prevent flash
	for (Control element : existingChildren) {
	((ProgressInfoItem) element).dispose();
	}

	int totalSize = Math.min(newItems.size(), MAX_DISPLAYED);

	for (int i = 0; i < totalSize; i++) {
	ProgressInfoItem item = createNewItem(infos[i]);
	item.setColor(i);
	}

	control.layout(true);
	updateForShowingProgress();
	}

	/**
	* Update for the progress being displayed.
	*/
	private void updateForShowingProgress() {
	if (control.getChildren().length > 0) {
	scrolled.setContent(control);
	} else {
	scrolled.setContent(noEntryArea);
	}
	}

	/**
	* Create a new item for info.
	*
	* @param info
	* @return ProgressInfoItem
	*/
	private ProgressInfoItem createNewItem(JobTreeElement info) {
	final ProgressInfoItem item = new ProgressInfoItem(control, SWT.NONE,
	info, progressService, finishedJobs);

	item.addControlListener(new ControlListener() {
	@Override
	public void controlMoved(ControlEvent e) {
	updateVisibleProgressItems(item);
	}

	@Override
	public void controlResized(ControlEvent e) {
	updateVisibleProgressItems(item);
	}
	});

	item.setIndexListener(new ProgressInfoItem.IndexListener() {
	@Override
	public void selectNext() {
	DetailedProgressViewer.this.selectNext(item);

	}

	@Override
	public void selectPrevious() {
	DetailedProgressViewer.this.selectPrevious(item);

	}

	@Override
	public void select() {

	Control[] children = control.getChildren();
	for (Control element : children) {
	ProgressInfoItem child = (ProgressInfoItem) element;
	if (!item.equals(child)) {
	child.selectWidgets(false);
	}
	}
	item.selectWidgets(true);

	}
	});

	// Refresh to populate with the current tasks
	item.refresh();
	return item;
	}

	/**
	* Select the previous item in the receiver.
	*
	* @param item
	*/
	protected void selectPrevious(ProgressInfoItem item) {
	Control[] children = control.getChildren();
	for (int i = 0; i < children.length; i++) {
	ProgressInfoItem child = (ProgressInfoItem) children[i];
	if (item.equals(child)) {
	ProgressInfoItem previous;
	if (i == 0) {
	previous = (ProgressInfoItem) children[children.length - 1];
	} else {
	previous = (ProgressInfoItem) children[i - 1];
	}

	item.selectWidgets(false);
	previous.selectWidgets(true);
	return;
	}
	}
	}

	/**
	* Select the next item in the receiver.
	*
	* @param item
	*/
	protected void selectNext(ProgressInfoItem item) {
	Control[] children = control.getChildren();
	for (int i = 0; i < children.length; i++) {
	ProgressInfoItem child = (ProgressInfoItem) children[i];
	if (item.equals(child)) {
	ProgressInfoItem next;
	if (i == children.length - 1) {
	next = (ProgressInfoItem) children[0];
	} else {
	next = (ProgressInfoItem) children[i + 1];
	}
	item.selectWidgets(false);
	next.selectWidgets(true);

	return;
	}
	}

	}

	@Override
	protected Widget doFindInputItem(Object element) {
	return null;
	}

	@Override
	protected Widget doFindItem(Object element) {
	Control[] existingChildren = control.getChildren();
	for (Control controlElement : existingChildren) {
	if (controlElement.isDisposed()
	\|\| controlElement.getData() == null) {
	continue;
	}
	if (controlElement.getData().equals(element)) {
	return controlElement;
	}
	}
	return null;
	}

	@Override
	protected void doUpdateItem(Widget item, Object element, boolean fullMap) {
	if (usingElementMap()) {
	unmapElement(item);
	}
	item.dispose();
	add(new Object[] { element });
	}

	@Override
	public Control getControl() {
	return scrolled;
	}

	@Override
	protected List<Object> getSelectionFromWidget() {
	return new ArrayList<>(0);
	}

	@Override
	protected void inputChanged(Object input, Object oldInput) {
	super.inputChanged(input, oldInput);
	refreshAll();
	updateForShowingProgress();
	}

	@Override
	protected void internalRefresh(Object element) {
	if (element == null) {
	return;
	}

	if (element.equals(getRoot())) {
	refreshAll();
	return;
	}
	Widget widget = findItem(element);
	if (widget == null) {
	add(new Object[] { element });
	return;
	}
	((ProgressInfoItem) widget).refresh();

	// Update the minimum size
	Point size = control.computeSize(SWT.DEFAULT, SWT.DEFAULT);
	// no horizontal size because we do not want to scroll horizontal
	size.x = 0;
	size.y += IDialogConstants.VERTICAL_SPACING;

	scrolled.setMinSize(size);
	}

	@Override
	public void remove(Object[] elements) {

	for (Object element : elements) {
	JobTreeElement treeElement = (JobTreeElement) element;
	// Make sure we are not keeping this one
	if (finishedJobs.isKept(treeElement)) {
	Widget item = doFindItem(element);
	if (item != null) {
	((ProgressInfoItem) item).refresh();
	}

	} else {
	Widget item = doFindItem(treeElement);
	if (item == null) {
	// Is the parent showing?
	Object parent = treeElement.getParent();
	if (parent != null)
	item = doFindItem(parent);
	}
	if (item != null) {
	unmapElement(element);
	item.dispose();
	}
	}
	}

	Control[] existingChildren = control.getChildren();
	for (int i = 0; i < existingChildren.length; i++) {
	ProgressInfoItem item = (ProgressInfoItem) existingChildren[i];
	item.setColor(i);
	}
	control.layout(true);
	updateForShowingProgress();
	}

	@Override
	public void reveal(Object element) {

	}

	@Override
	protected void setSelectionToWidget(@SuppressWarnings("rawtypes") List l, boolean reveal) {

	}

	/**
	* Cancel the current selection
	*
	*/
	public void cancelSelection() {

	}

	/**
	* Set focus on the current selection.
	*
	*/
	public void setFocus() {
	Control[] children = control.getChildren();
	if (children.length > 0) {
	((ProgressInfoItem)children[0]).setButtonFocus();
	} else {
	noEntryArea.setFocus();
	}
	}

	/**
	* Refresh everything as the root is being refreshed.
	*/
	private void refreshAll() {

	Object[] infos = getSortedChildren(getRoot());
	Control[] existingChildren = control.getChildren();

	for (Control element : existingChildren) {
	element.dispose();

	}

	int maxLength = Math.min(infos.length,MAX_DISPLAYED);
	// Create new ones if required
	for (int i = 0; i < maxLength; i++) {
	ProgressInfoItem item = createNewItem((JobTreeElement) infos[i]);
	item.setColor(i);
	}

	control.layout(true);
	updateForShowingProgress();

	}

	/**
	* Set the virtual items to be visible or not depending on the displayed
	* area.
	*/
	private void updateVisibleItems() {
	updateVisibleProgressItems(control.getChildren());
	}

	private void updateVisibleProgressItems(Control... progressInfoItems) {
	int top = scrolled.getOrigin().y;
	int bottom = top + scrolled.getParent().getBounds().height;
	for (Control element : progressInfoItems) {
	ProgressInfoItem item = (ProgressInfoItem) element;
	item.setDisplayed(top, bottom);

	}
	}

	public ProgressInfoItem[] getProgressInfoItems() {
	Control[] children = control.getChildren();
	ProgressInfoItem[] progressInfoItems = new ProgressInfoItem[children.length];
	System.arraycopy(children, 0, progressInfoItems, 0, children.length);
	return progressInfoItems;
	}

	}