taverna-workbench-contextual-views-impl/src/main/java/net/sf/taverna/t2/workbench/ui/views/contextualviews/impl/ContextualViewComponent.java - incubator-taverna-workbench - Git at Google

 package net.sf.taverna.t2.workbench.ui.views.contextualviews.impl;

 import static java.awt.GridBagConstraints.BOTH;
 import static java.awt.GridBagConstraints.CENTER;
 import static java.awt.GridBagConstraints.HORIZONTAL;
 import static java.awt.GridBagConstraints.LINE_START;
 import static java.awt.GridBagConstraints.NONE;
 import static net.sf.taverna.t2.lang.ui.ShadedLabel.BLUE;
 import static net.sf.taverna.t2.lang.ui.ShadedLabel.GREEN;
 import static net.sf.taverna.t2.lang.ui.ShadedLabel.ORANGE;
 import static net.sf.taverna.t2.workbench.icons.WorkbenchIcons.minusIcon;
 import static net.sf.taverna.t2.workbench.icons.WorkbenchIcons.plusIcon;

 import java.awt.Color;
 import java.awt.Frame;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;

 import javax.swing.Action;
 import javax.swing.ImageIcon;
 import javax.swing.JButton;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.SwingUtilities;
 import javax.swing.Timer;

 import net.sf.taverna.t2.lang.observer.Observable;
 import net.sf.taverna.t2.lang.observer.Observer;
 import net.sf.taverna.t2.lang.observer.SwingAwareObserver;
 import net.sf.taverna.t2.lang.ui.ShadedLabel;
 import net.sf.taverna.t2.workbench.edits.EditManager;
 import net.sf.taverna.t2.workbench.edits.EditManager.EditManagerEvent;
 import net.sf.taverna.t2.workbench.selection.DataflowSelectionModel;
 import net.sf.taverna.t2.workbench.selection.SelectionManager;
 import net.sf.taverna.t2.workbench.selection.events.DataflowSelectionMessage;
 import net.sf.taverna.t2.workbench.selection.events.SelectionManagerEvent;
 import net.sf.taverna.t2.workbench.selection.events.WorkflowBundleSelectionEvent;
 import net.sf.taverna.t2.workbench.ui.Utils;
 import net.sf.taverna.t2.workbench.ui.views.contextualviews.ContextualView;
 import net.sf.taverna.t2.workbench.ui.views.contextualviews.activity.ContextualViewFactory;
 import net.sf.taverna.t2.workbench.ui.views.contextualviews.activity.ContextualViewFactoryRegistry;
 import net.sf.taverna.t2.workbench.ui.zaria.UIComponentSPI;
 import uk.org.taverna.scufl2.api.container.WorkflowBundle;

 @SuppressWarnings("serial")
 public class ContextualViewComponent extends JScrollPane implements UIComponentSPI {
 	/** delay before contextual view is redrawn */
 	private static final int DELAY = 250;
 	private static final Color[] colors = new Color[] { BLUE, GREEN, ORANGE };
 	// HACK ALERT!
 	public static boolean selfGenerated = false;

 	private Observer<DataflowSelectionMessage> dataflowSelectionListener = new DataflowSelectionListener();
 	private SelectionManager selectionManager;
 	private ContextualViewFactoryRegistry contextualViewFactoryRegistry;
 	GridBagConstraints gbc;
 	protected Map<JPanel, SectionLabel> panelToLabelMap = new HashMap<>();
 	private String lastOpenedSectionName = "";
 	private JPanel mainPanel;
 	private List<JPanel> shownComponents = null;
 	int colorIndex = 0;
 	private Timer updateSelectionTimer = null;
 	private Object lastSelectedObject = null;

 	private static final Comparator<ContextualView> viewComparator = new Comparator<ContextualView>() {
 		@Override
 		public int compare(ContextualView o1, ContextualView o2) {
 			return o1.getPreferredPosition() - o2.getPreferredPosition();
 		}
 	};

 	public ContextualViewComponent(EditManager editManager,
 			SelectionManager selectionManager,
 			ContextualViewFactoryRegistry contextualViewFactoryRegistry) {
 		this.selectionManager = selectionManager;
 		this.contextualViewFactoryRegistry = contextualViewFactoryRegistry;
 		updateSelectionTimer = new Timer(DELAY, updateSelectionListener);
 		updateSelectionTimer.setRepeats(false);

 		initialise();

 		editManager.addObserver(new EditManagerObserver());
 		selectionManager.addObserver(new SelectionManagerObserver());
 	}

 	@Override
 	public ImageIcon getIcon() {
 		// TODO Auto-generated method stub
 		return null;
 	}

 	@Override
 	public String getName() {
 		return "Details";
 	}

 	private void initialise() {
 		mainPanel = new JPanel(new GridBagLayout());
 		this.setViewportView(mainPanel);
 	}

 	@Override
 	public void onDisplay() {
 	}

 	@Override
 	public void onDispose() {
 		updateSelectionTimer.stop();
 	}

 	@SuppressWarnings("unchecked")
 	private void updateContextualView(List<ContextualViewFactory<?>> viewFactories,
 			Object selection) {
 		if (selection == lastSelectedObject)
 			return;
 		lastSelectedObject = selection;
 		mainPanel = new JPanel(new GridBagLayout());
 		panelToLabelMap.clear();

 		GridBagConstraints gbc = new GridBagConstraints();
 		gbc.gridx = 0;
 		gbc.weightx = 0.1;
 		gbc.fill = HORIZONTAL;

 		gbc.gridy = 0;
 		shownComponents = new ArrayList<>();
 		List<ContextualView> views = new ArrayList<>();
 		for (ContextualViewFactory<?> cvf : viewFactories)
 			views.addAll(((ContextualViewFactory<Object>) cvf)
 					.getViews(selection));
 		Collections.sort(views, viewComparator);
 		colorIndex = 0;
 		if (views.isEmpty())
 			mainPanel.add(new JLabel("No details available"));
 		else
 			populateContextualView(viewFactories, gbc, views);
 		gbc.weighty = 0.1;
 		gbc.fill = BOTH;
 		mainPanel.add(new JPanel(), gbc);
 		// mainPanel.revalidate();
 		// mainPanel.repaint();
 		this.setViewportView(mainPanel);
 		// this.revalidate();
 		// this.repaint();
 	}

 	private void populateContextualView(
 			List<ContextualViewFactory<?>> viewFactories,
 			GridBagConstraints gbc, List<ContextualView> views) {
 		JPanel firstPanel = null;
 		JPanel lastOpenedSection = null;
 		for (ContextualView view : views) {
 			SectionLabel label = new SectionLabel(view.getViewTitle(), nextColor());
 			mainPanel.add(label, gbc);
 			gbc.gridy++;
 			JPanel subPanel = new JPanel();
 			if (view.getViewTitle().equals(lastOpenedSectionName))
 				lastOpenedSection = subPanel;
 			subPanel.setLayout(new GridBagLayout());

 			GridBagConstraints constraints = new GridBagConstraints();
 			constraints.gridx = 0;
 			constraints.gridy = 0;
 			constraints.weightx = 0.1;
 			constraints.weighty = 0;
 			constraints.anchor = CENTER;
 			constraints.fill = HORIZONTAL;

 			subPanel.add(view, constraints);
 			Frame frame = Utils.getParentFrame(this);
 			Action configureAction = view.getConfigureAction(frame);
 			if (configureAction != null) {
 				JButton configButton = new JButton(configureAction);
 				if (configButton.getText() == null
 						|| configButton.getText().isEmpty())
 					configButton.setText("Configure");
 				constraints.gridy++;
 				constraints.fill = NONE;
 				constraints.anchor = LINE_START;
 				subPanel.add(configButton, constraints);
 			}
 			if (firstPanel == null)
 				firstPanel = subPanel;
 			mainPanel.add(subPanel, gbc);
 			shownComponents.add(subPanel);
 			gbc.gridy++;
 			if (viewFactories.size() != 1)
 				makeCloseable(subPanel, label);
 			else {
 				lastOpenedSectionName = label.getText();
 				lastOpenedSection = subPanel;
 				panelToLabelMap.put(subPanel, label);
 				subPanel.setVisible(false);
 			}
 		}
 		if (lastOpenedSection != null)
 			openSection(lastOpenedSection);
 		else if (firstPanel != null)
 			openSection(firstPanel);
 	}

 	private void clearContextualView() {
 		lastSelectedObject = null;
 		mainPanel = new JPanel(new GridBagLayout());
 		mainPanel.add(new JLabel("No details available"));
 		this.setViewportView(mainPanel);
 		this.revalidate();
 	}

 	public void updateSelection(Object selectedItem) {
 		findContextualView(selectedItem);
 	}

 	private Runnable updateSelectionRunnable = new Runnable() {
 		@Override
 		public void run() {
 			Object selection = getSelection();
 			if (selection == null)
 				clearContextualView();
 			else
 				updateSelection(selection);
 		}
 	};

 	private ActionListener updateSelectionListener = new ActionListener() {
 		@Override
 		public void actionPerformed(ActionEvent e) {
 			SwingUtilities.invokeLater(updateSelectionRunnable);
 		}
 	};

 	public void updateSelection() {
 		updateSelectionTimer.restart();
 	}

 	private Object getSelection() {
 		WorkflowBundle workflowBundle = selectionManager.getSelectedWorkflowBundle();

 		/*
 		 * If there is no currently opened dataflow, clear the contextual view
 		 * panel
 		 */
 		if (workflowBundle == null) {
 			return null;
 		}
 		DataflowSelectionModel selectionModel = selectionManager
 				.getDataflowSelectionModel(workflowBundle);
 		Set<Object> selection = selectionModel.getSelection();

 		/*
 		 * If the dataflow is opened but no component of the dataflow is
 		 * selected, clear the contextual view panel
 		 */
 		if (selection.isEmpty())
 			return null;
 		return selection.iterator().next();
 	}

 	private void findContextualView(Object selection) {
 		List<ContextualViewFactory<?>> viewFactoriesForBeanType = contextualViewFactoryRegistry
 				.getViewFactoriesForObject(selection);
 		updateContextualView(viewFactoriesForBeanType, selection);
 	}

 	private final class SelectionManagerObserver extends SwingAwareObserver<SelectionManagerEvent> {
 		@Override
 		public void notifySwing(Observable<SelectionManagerEvent> sender, SelectionManagerEvent message) {
 			if (message instanceof WorkflowBundleSelectionEvent)
 				bundleSelected((WorkflowBundleSelectionEvent) message);
 		}

 		private void bundleSelected(WorkflowBundleSelectionEvent event) {
 			WorkflowBundle oldBundle = event
 					.getPreviouslySelectedWorkflowBundle();
 			WorkflowBundle newBundle = event.getSelectedWorkflowBundle();

 			if (oldBundle != null)
 				selectionManager.getDataflowSelectionModel(oldBundle)
 						.removeObserver(dataflowSelectionListener);
 			if (newBundle != null)
 				selectionManager.getDataflowSelectionModel(newBundle)
 						.addObserver(dataflowSelectionListener);
 			lastSelectedObject = null;
 			updateSelection();
 		}
 	}

 	private final class DataflowSelectionListener extends SwingAwareObserver<DataflowSelectionMessage> {
 		@Override
 		public void notifySwing(Observable<DataflowSelectionMessage> sender,
 				DataflowSelectionMessage message) {
 			updateSelection();
 		}
 	}

 	private final class EditManagerObserver extends SwingAwareObserver<EditManagerEvent> {
 		@Override
 		public void notifySwing(Observable<EditManagerEvent> sender, EditManagerEvent message) {
 			Object selection = getSelection();
 			if ((selection != lastSelectedObject) && !selfGenerated) {
 				lastSelectedObject = null;
 				refreshView();
 			}
 		}
 	}

 	public void refreshView() {
 		if (mainPanel != null)
 			updateSelection();
 	}

 	private final class SectionLabel extends ShadedLabel {
 		private JLabel expand;

 		private SectionLabel(String text, Color colour) {
 			super(text, colour);
 			expand = new JLabel(minusIcon);
 			add(expand, 0);
 			setExpanded(true);
 		}

 		public void setExpanded(boolean expanded) {
 			if (expanded)
 				expand.setIcon(minusIcon);
 			else
 				expand.setIcon(plusIcon);
 		}
 	}

 	private void makeCloseable(JPanel panel, SectionLabel label) {
 		panel.setVisible(false);
 		if (panelToLabelMap.get(panel) != label) {
 			panelToLabelMap.put(panel, label);
 			// Only add mouse listener once
 			label.addMouseListener(new SectionOpener(panel));
 		}
 	}

 	protected class SectionOpener extends MouseAdapter {
 		private final JPanel sectionToOpen;

 		public SectionOpener(JPanel sectionToOpen) {
 			this.sectionToOpen = sectionToOpen;
 		}

 		@Override
 		public void mouseClicked(MouseEvent e) {
 			openSection(sectionToOpen);
 		}
 	}

 	public synchronized void openSection(JPanel sectionToOpen) {
 		lastOpenedSectionName = "";
 		for (Entry<JPanel, SectionLabel> entry : panelToLabelMap.entrySet()) {
 			JPanel section = entry.getKey();
 			SectionLabel sectionLabel = entry.getValue();

 			if (section != sectionToOpen)
 				section.setVisible(false);
 			else {
 				section.setVisible(!section.isVisible());
 				if (section.isVisible())
 					lastOpenedSectionName = sectionLabel.getText();
 			}
 			sectionLabel.setExpanded(section.isVisible());
 		}
 		this.revalidate();
 		this.repaint();
 	}

 	private Color nextColor() {
 		if (colorIndex >= colors.length)
 			colorIndex = 0;
 		return colors[colorIndex++];
 	}
 }
	package net.sf.taverna.t2.workbench.ui.views.contextualviews.impl;

	import static java.awt.GridBagConstraints.BOTH;
	import static java.awt.GridBagConstraints.CENTER;
	import static java.awt.GridBagConstraints.HORIZONTAL;
	import static java.awt.GridBagConstraints.LINE_START;
	import static java.awt.GridBagConstraints.NONE;
	import static net.sf.taverna.t2.lang.ui.ShadedLabel.BLUE;
	import static net.sf.taverna.t2.lang.ui.ShadedLabel.GREEN;
	import static net.sf.taverna.t2.lang.ui.ShadedLabel.ORANGE;
	import static net.sf.taverna.t2.workbench.icons.WorkbenchIcons.minusIcon;
	import static net.sf.taverna.t2.workbench.icons.WorkbenchIcons.plusIcon;

	import java.awt.Color;
	import java.awt.Frame;
	import java.awt.GridBagConstraints;
	import java.awt.GridBagLayout;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import java.awt.event.MouseAdapter;
	import java.awt.event.MouseEvent;
	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.Comparator;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.Map.Entry;
	import java.util.Set;

	import javax.swing.Action;
	import javax.swing.ImageIcon;
	import javax.swing.JButton;
	import javax.swing.JLabel;
	import javax.swing.JPanel;
	import javax.swing.JScrollPane;
	import javax.swing.SwingUtilities;
	import javax.swing.Timer;

	import net.sf.taverna.t2.lang.observer.Observable;
	import net.sf.taverna.t2.lang.observer.Observer;
	import net.sf.taverna.t2.lang.observer.SwingAwareObserver;
	import net.sf.taverna.t2.lang.ui.ShadedLabel;
	import net.sf.taverna.t2.workbench.edits.EditManager;
	import net.sf.taverna.t2.workbench.edits.EditManager.EditManagerEvent;
	import net.sf.taverna.t2.workbench.selection.DataflowSelectionModel;
	import net.sf.taverna.t2.workbench.selection.SelectionManager;
	import net.sf.taverna.t2.workbench.selection.events.DataflowSelectionMessage;
	import net.sf.taverna.t2.workbench.selection.events.SelectionManagerEvent;
	import net.sf.taverna.t2.workbench.selection.events.WorkflowBundleSelectionEvent;
	import net.sf.taverna.t2.workbench.ui.Utils;
	import net.sf.taverna.t2.workbench.ui.views.contextualviews.ContextualView;
	import net.sf.taverna.t2.workbench.ui.views.contextualviews.activity.ContextualViewFactory;
	import net.sf.taverna.t2.workbench.ui.views.contextualviews.activity.ContextualViewFactoryRegistry;
	import net.sf.taverna.t2.workbench.ui.zaria.UIComponentSPI;
	import uk.org.taverna.scufl2.api.container.WorkflowBundle;

	@SuppressWarnings("serial")
	public class ContextualViewComponent extends JScrollPane implements UIComponentSPI {
	/** delay before contextual view is redrawn */
	private static final int DELAY = 250;
	private static final Color[] colors = new Color[] { BLUE, GREEN, ORANGE };
	// HACK ALERT!
	public static boolean selfGenerated = false;

	private Observer<DataflowSelectionMessage> dataflowSelectionListener = new DataflowSelectionListener();
	private SelectionManager selectionManager;
	private ContextualViewFactoryRegistry contextualViewFactoryRegistry;
	GridBagConstraints gbc;
	protected Map<JPanel, SectionLabel> panelToLabelMap = new HashMap<>();
	private String lastOpenedSectionName = "";
	private JPanel mainPanel;
	private List<JPanel> shownComponents = null;
	int colorIndex = 0;
	private Timer updateSelectionTimer = null;
	private Object lastSelectedObject = null;

	private static final Comparator<ContextualView> viewComparator = new Comparator<ContextualView>() {
	@Override
	public int compare(ContextualView o1, ContextualView o2) {
	return o1.getPreferredPosition() - o2.getPreferredPosition();
	}
	};

	public ContextualViewComponent(EditManager editManager,
	SelectionManager selectionManager,
	ContextualViewFactoryRegistry contextualViewFactoryRegistry) {
	this.selectionManager = selectionManager;
	this.contextualViewFactoryRegistry = contextualViewFactoryRegistry;
	updateSelectionTimer = new Timer(DELAY, updateSelectionListener);
	updateSelectionTimer.setRepeats(false);

	initialise();

	editManager.addObserver(new EditManagerObserver());
	selectionManager.addObserver(new SelectionManagerObserver());
	}

	@Override
	public ImageIcon getIcon() {
	// TODO Auto-generated method stub
	return null;
	}

	@Override
	public String getName() {
	return "Details";
	}

	private void initialise() {
	mainPanel = new JPanel(new GridBagLayout());
	this.setViewportView(mainPanel);
	}

	@Override
	public void onDisplay() {
	}

	@Override
	public void onDispose() {
	updateSelectionTimer.stop();
	}

	@SuppressWarnings("unchecked")
	private void updateContextualView(List<ContextualViewFactory<?>> viewFactories,
	Object selection) {
	if (selection == lastSelectedObject)
	return;
	lastSelectedObject = selection;
	mainPanel = new JPanel(new GridBagLayout());
	panelToLabelMap.clear();

	GridBagConstraints gbc = new GridBagConstraints();
	gbc.gridx = 0;
	gbc.weightx = 0.1;
	gbc.fill = HORIZONTAL;

	gbc.gridy = 0;
	shownComponents = new ArrayList<>();
	List<ContextualView> views = new ArrayList<>();
	for (ContextualViewFactory<?> cvf : viewFactories)
	views.addAll(((ContextualViewFactory<Object>) cvf)
	.getViews(selection));
	Collections.sort(views, viewComparator);
	colorIndex = 0;
	if (views.isEmpty())
	mainPanel.add(new JLabel("No details available"));
	else
	populateContextualView(viewFactories, gbc, views);
	gbc.weighty = 0.1;
	gbc.fill = BOTH;
	mainPanel.add(new JPanel(), gbc);
	// mainPanel.revalidate();
	// mainPanel.repaint();
	this.setViewportView(mainPanel);
	// this.revalidate();
	// this.repaint();
	}

	private void populateContextualView(
	List<ContextualViewFactory<?>> viewFactories,
	GridBagConstraints gbc, List<ContextualView> views) {
	JPanel firstPanel = null;
	JPanel lastOpenedSection = null;
	for (ContextualView view : views) {
	SectionLabel label = new SectionLabel(view.getViewTitle(), nextColor());
	mainPanel.add(label, gbc);
	gbc.gridy++;
	JPanel subPanel = new JPanel();
	if (view.getViewTitle().equals(lastOpenedSectionName))
	lastOpenedSection = subPanel;
	subPanel.setLayout(new GridBagLayout());

	GridBagConstraints constraints = new GridBagConstraints();
	constraints.gridx = 0;
	constraints.gridy = 0;
	constraints.weightx = 0.1;
	constraints.weighty = 0;
	constraints.anchor = CENTER;
	constraints.fill = HORIZONTAL;

	subPanel.add(view, constraints);
	Frame frame = Utils.getParentFrame(this);
	Action configureAction = view.getConfigureAction(frame);
	if (configureAction != null) {
	JButton configButton = new JButton(configureAction);
	if (configButton.getText() == null
	\|\| configButton.getText().isEmpty())
	configButton.setText("Configure");
	constraints.gridy++;
	constraints.fill = NONE;
	constraints.anchor = LINE_START;
	subPanel.add(configButton, constraints);
	}
	if (firstPanel == null)
	firstPanel = subPanel;
	mainPanel.add(subPanel, gbc);
	shownComponents.add(subPanel);
	gbc.gridy++;
	if (viewFactories.size() != 1)
	makeCloseable(subPanel, label);
	else {
	lastOpenedSectionName = label.getText();
	lastOpenedSection = subPanel;
	panelToLabelMap.put(subPanel, label);
	subPanel.setVisible(false);
	}
	}
	if (lastOpenedSection != null)
	openSection(lastOpenedSection);
	else if (firstPanel != null)
	openSection(firstPanel);
	}

	private void clearContextualView() {
	lastSelectedObject = null;
	mainPanel = new JPanel(new GridBagLayout());
	mainPanel.add(new JLabel("No details available"));
	this.setViewportView(mainPanel);
	this.revalidate();
	}

	public void updateSelection(Object selectedItem) {
	findContextualView(selectedItem);
	}

	private Runnable updateSelectionRunnable = new Runnable() {
	@Override
	public void run() {
	Object selection = getSelection();
	if (selection == null)
	clearContextualView();
	else
	updateSelection(selection);
	}
	};

	private ActionListener updateSelectionListener = new ActionListener() {
	@Override
	public void actionPerformed(ActionEvent e) {
	SwingUtilities.invokeLater(updateSelectionRunnable);
	}
	};

	public void updateSelection() {
	updateSelectionTimer.restart();
	}

	private Object getSelection() {
	WorkflowBundle workflowBundle = selectionManager.getSelectedWorkflowBundle();

	/*
	* If there is no currently opened dataflow, clear the contextual view
	* panel
	*/
	if (workflowBundle == null) {
	return null;
	}
	DataflowSelectionModel selectionModel = selectionManager
	.getDataflowSelectionModel(workflowBundle);
	Set<Object> selection = selectionModel.getSelection();

	/*
	* If the dataflow is opened but no component of the dataflow is
	* selected, clear the contextual view panel
	*/
	if (selection.isEmpty())
	return null;
	return selection.iterator().next();
	}

	private void findContextualView(Object selection) {
	List<ContextualViewFactory<?>> viewFactoriesForBeanType = contextualViewFactoryRegistry
	.getViewFactoriesForObject(selection);
	updateContextualView(viewFactoriesForBeanType, selection);
	}

	private final class SelectionManagerObserver extends SwingAwareObserver<SelectionManagerEvent> {
	@Override
	public void notifySwing(Observable<SelectionManagerEvent> sender, SelectionManagerEvent message) {
	if (message instanceof WorkflowBundleSelectionEvent)
	bundleSelected((WorkflowBundleSelectionEvent) message);
	}

	private void bundleSelected(WorkflowBundleSelectionEvent event) {
	WorkflowBundle oldBundle = event
	.getPreviouslySelectedWorkflowBundle();
	WorkflowBundle newBundle = event.getSelectedWorkflowBundle();

	if (oldBundle != null)
	selectionManager.getDataflowSelectionModel(oldBundle)
	.removeObserver(dataflowSelectionListener);
	if (newBundle != null)
	selectionManager.getDataflowSelectionModel(newBundle)
	.addObserver(dataflowSelectionListener);
	lastSelectedObject = null;
	updateSelection();
	}
	}

	private final class DataflowSelectionListener extends SwingAwareObserver<DataflowSelectionMessage> {
	@Override
	public void notifySwing(Observable<DataflowSelectionMessage> sender,
	DataflowSelectionMessage message) {
	updateSelection();
	}
	}

	private final class EditManagerObserver extends SwingAwareObserver<EditManagerEvent> {
	@Override
	public void notifySwing(Observable<EditManagerEvent> sender, EditManagerEvent message) {
	Object selection = getSelection();
	if ((selection != lastSelectedObject) && !selfGenerated) {
	lastSelectedObject = null;
	refreshView();
	}
	}
	}

	public void refreshView() {
	if (mainPanel != null)
	updateSelection();
	}

	private final class SectionLabel extends ShadedLabel {
	private JLabel expand;

	private SectionLabel(String text, Color colour) {
	super(text, colour);
	expand = new JLabel(minusIcon);
	add(expand, 0);
	setExpanded(true);
	}

	public void setExpanded(boolean expanded) {
	if (expanded)
	expand.setIcon(minusIcon);
	else
	expand.setIcon(plusIcon);
	}
	}

	private void makeCloseable(JPanel panel, SectionLabel label) {
	panel.setVisible(false);
	if (panelToLabelMap.get(panel) != label) {
	panelToLabelMap.put(panel, label);
	// Only add mouse listener once
	label.addMouseListener(new SectionOpener(panel));
	}
	}

	protected class SectionOpener extends MouseAdapter {
	private final JPanel sectionToOpen;

	public SectionOpener(JPanel sectionToOpen) {
	this.sectionToOpen = sectionToOpen;
	}

	@Override
	public void mouseClicked(MouseEvent e) {
	openSection(sectionToOpen);
	}
	}

	public synchronized void openSection(JPanel sectionToOpen) {
	lastOpenedSectionName = "";
	for (Entry<JPanel, SectionLabel> entry : panelToLabelMap.entrySet()) {
	JPanel section = entry.getKey();
	SectionLabel sectionLabel = entry.getValue();

	if (section != sectionToOpen)
	section.setVisible(false);
	else {
	section.setVisible(!section.isVisible());
	if (section.isVisible())
	lastOpenedSectionName = sectionLabel.getText();
	}
	sectionLabel.setExpanded(section.isVisible());
	}
	this.revalidate();
	this.repaint();
	}

	private Color nextColor() {
	if (colorIndex >= colors.length)
	colorIndex = 0;
	return colors[colorIndex++];
	}
	}