eclient/org.eclipse.statet.rj.eclient.graphics/src/org/eclipse/statet/rj/eclient/graphics/PageBookRGraphicView.java - statet/org.eclipse.statet-rj - Git at Google

 /*=============================================================================#
  # Copyright (c) 2009, 2018 Stephan Wahlbrink and others.
  #
  # This program and the accompanying materials are made available under the
  # terms of the Eclipse Public License 2.0 which is available at
  # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
  # which is available at https://www.apache.org/licenses/LICENSE-2.0.
  #
  # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
  #
  # Contributors:
  #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
  #=============================================================================*/

 package org.eclipse.statet.rj.eclient.graphics;

 import static org.eclipse.statet.ecommons.ui.actions.UIActions.ADDITIONS_GROUP_ID;

 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;

 import org.eclipse.core.commands.AbstractHandler;
 import org.eclipse.core.commands.ExecutionEvent;
 import org.eclipse.core.commands.ExecutionException;
 import org.eclipse.core.commands.IHandler2;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.jface.action.IStatusLineManager;
 import org.eclipse.jface.action.IToolBarManager;
 import org.eclipse.jface.action.Separator;
 import org.eclipse.jface.action.StatusLineContributionItem;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IMemento;
 import org.eclipse.ui.IViewReference;
 import org.eclipse.ui.IViewSite;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.PartInitException;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.menus.CommandContributionItemParameter;
 import org.eclipse.ui.part.IPageBookViewPage;
 import org.eclipse.ui.services.IServiceLocator;
 import org.eclipse.ui.statushandlers.StatusManager;
 import org.eclipse.ui.views.IViewDescriptor;

 import org.eclipse.statet.jcommons.lang.NonNullByDefault;
 import org.eclipse.statet.jcommons.lang.Nullable;

 import org.eclipse.statet.ecommons.ts.core.Tool;
 import org.eclipse.statet.ecommons.ui.SharedUIResources;
 import org.eclipse.statet.ecommons.ui.actions.HandlerCollection;
 import org.eclipse.statet.ecommons.ui.actions.HandlerContributionItem;
 import org.eclipse.statet.ecommons.ui.actions.SimpleContributionItem;
 import org.eclipse.statet.ecommons.ui.mpbv.ManagedPageBookView;
 import org.eclipse.statet.ecommons.ui.mpbv.PageBookSession;
 import org.eclipse.statet.ecommons.ui.util.UIAccess;
 import org.eclipse.statet.ecommons.ui.workbench.ContextHandlers;

 import org.eclipse.statet.rj.eclient.core.AbstractRToolRunnable;
 import org.eclipse.statet.rj.eclient.core.RToolService;


 /**
  * Multi page view for R graphics.
  * <p>
  * No view is registered by this plug-in.</p>
  */
 @NonNullByDefault
 public abstract class PageBookRGraphicView extends ManagedPageBookView<PageBookRGraphicView.RGraphicSession> {


 	public class RGraphicSession implements PageBookSession {


 		private final ERGraphic graphic;


 		public RGraphicSession(final ERGraphic graphic) {
 			this.graphic= graphic;
 		}


 		@Override
 		public String getLabel() {
 			return this.graphic.getLabel();
 		}

 		@Override
 		public @Nullable ImageDescriptor getImageDescriptor() {
 			return ImageDescriptor.createFromImage(getTitleImage());
 		}

 		public ERGraphic getGraphic() {
 			return this.graphic;
 		}

 	}

 	public static class ShowRequiredViewListener implements ERGraphicsManager.ListenerShowExtension {


 		private final String viewId;


 		public ShowRequiredViewListener(final String viewId) {
 			this.viewId= viewId;
 		}


 		@Override
 		public int canShowGraphic(final ERGraphic graphic) {
 			return 0;
 		}

 		private static String getId(final IViewReference ref) {
 			// E-Bug #405563
 			final String id= ref.getId();
 			final int idx= id.indexOf(':');
 			return (idx >= 0) ? id.substring(0, idx) : id;
 		}

 		@Override
 		public void showGraphic(final ERGraphic graphic) {
 			try {
 				final IWorkbenchPage page= getBestPage(graphic);
 				String secondaryId= ""; //$NON-NLS-1$
 				final IViewReference[] refs= page.getViewReferences();
 				for (int i= 0; i < refs.length; i++) { // search views not yet instanced
 					if (this.viewId.equals(getId(refs[i])) && refs[i].getView(false) == null) {
 						if (refs[i].getSecondaryId() == null) {
 							secondaryId= null;
 							break;
 						}
 						if (secondaryId == "") { //$NON-NLS-1$
 							secondaryId= refs[i].getSecondaryId();
 						}
 					}
 				}
 				if (secondaryId == "") { //$NON-NLS-1$
 					secondaryId= "t"+System.currentTimeMillis(); //$NON-NLS-1$
 				}
 				newViewGraphic= graphic;
 				page.showView(this.viewId, secondaryId, IWorkbenchPage.VIEW_VISIBLE );
 			}
 			catch (final PartInitException e) {
 				StatusManager.getManager().handle(new Status(IStatus.ERROR, RGraphics.BUNDLE_ID,
 						"An error occurred when opening a new R Graphics view.", e ));
 			}
 			finally {
 				newViewGraphic= null;
 			}
 		}

 		protected IWorkbenchPage getBestPage(final ERGraphic graphic) {
 			return UIAccess.getActiveWorkbenchPage(true);
 		}

 		@Override
 		public void graphicAdded(final ERGraphic graphic) {
 		}

 		@Override
 		public void graphicRemoved(final ERGraphic graphic) {
 		}

 	}


 	protected static abstract class NewDevHandler extends AbstractHandler {


 		public NewDevHandler() {
 		}


 		protected abstract Tool getTool() throws CoreException;

 		@Override
 		public @Nullable Object execute(final ExecutionEvent event) throws ExecutionException {
 			try {
 				final Tool tool= getTool();
 				if (tool != null) {
 					tool.getQueue().add(new AbstractRToolRunnable(
 						"r/rj/gd/new", "New R Graphic") { //$NON-NLS-1$

 						@Override
 						public void run(final RToolService r,
 								final IProgressMonitor monitor) throws CoreException {
 							r.evalVoid("rj.gd::rj.GD()", monitor); //$NON-NLS-1$
 						}

 					});
 				}
 			}
 			catch (final CoreException e) {
 				if (e.getStatus().getSeverity() != IStatus.CANCEL) {
 					StatusManager.getManager().handle(new Status(IStatus.ERROR, RGraphics.BUNDLE_ID, -1,
 							"An error occurrend when creating a new graphic device.", e),
 							StatusManager.LOG | StatusManager.SHOW);
 				}
 			}
 			return null;
 		}

 	}


 	private static class RGraphicComparator implements Comparator<RGraphicSession> {

 		public RGraphicComparator() {
 		}

 		@Override
 		public int compare(final RGraphicSession o1, final RGraphicSession o2) {
 			final Tool handle1= o1.graphic.getRHandle();
 			final Tool handle2= o2.graphic.getRHandle();
 			if (handle1 == null) {
 				if (handle2 == null) {
 					return 0;
 				}
 				return Integer.MIN_VALUE;
 			}
 			else if (handle2 == null) {
 				return Integer.MAX_VALUE;
 			}
 			if (handle1 != handle2) {
 				final int diff= handle1.getLabel(Tool.LONG_LABEL).compareTo(handle2.getLabel(Tool.LONG_LABEL));
 				if (diff != 0) {
 					return diff;
 				}
 			}
 			return o1.graphic.getDevId() - o2.graphic.getDevId();
 		}

 	}


 	private static class OpenAdditionalViewHandler extends AbstractHandler {

 		private final IViewSite viewSite;

 		public OpenAdditionalViewHandler(final IViewSite viewSite) {
 			this.viewSite= viewSite;
 		}

 		@Override
 		public @Nullable Object execute(final ExecutionEvent event) throws ExecutionException {
 			try {
 				final String secondaryId= "t" + System.currentTimeMillis(); //$NON-NLS-1$
 				this.viewSite.getWorkbenchWindow().getActivePage().showView(this.viewSite.getId(),
 						secondaryId, IWorkbenchPage.VIEW_ACTIVATE );
 			}
 			catch (final PartInitException e) {
 				StatusManager.getManager().handle(new Status(IStatus.ERROR, RGraphics.BUNDLE_ID, -1,
 						"An error occurred when opening an additional R graphics view.", e));
 			}
 			return null;
 		}

 	}

 	private class PinPageAction extends SimpleContributionItem {

 		public PinPageAction() {
 			super("Pin Graphic Page", "P",
 					SharedUIResources.getImages().getDescriptor(SharedUIResources.LOCTOOL_PIN_PAGE_IMAGE_ID),
 					SharedUIResources.getImages().getDescriptor(SharedUIResources.LOCTOOLD_PIN_PAGE_IMAGE_ID),
 					SimpleContributionItem.STYLE_CHECK );
 			setChecked(PageBookRGraphicView.this.pinPage);
 		}

 		@Override
 		protected void execute() throws ExecutionException {
 			PageBookRGraphicView.this.pinPage= !PageBookRGraphicView.this.pinPage;
 			setChecked(PageBookRGraphicView.this.pinPage);
 		}

 	}


 	private static @Nullable ERGraphic newViewGraphic;

 	private ERGraphicsManager manager;
 	private final ERGraphicsManager.ListenerShowExtension managerListener= new ERGraphicsManager.ListenerShowExtension() {
 		private @Nullable ERGraphic toShow;
 		@Override
 		public int canShowGraphic(final ERGraphic graphic) {
 			return PageBookRGraphicView.this.canShowGraphic(graphic);
 		}
 		@Override
 		public void showGraphic(final ERGraphic graphic) {
 			this.toShow= graphic;
 			final IViewSite site= getViewSite();
 			try {
 				site.getPage().showView(site.getId(), site.getSecondaryId(), IWorkbenchPage.VIEW_VISIBLE);
 			}
 			catch (final PartInitException e) {}
 		}
 		@Override
 		public void graphicAdded(final ERGraphic graphic) {
 			add(graphic, graphic == this.toShow
 					|| (graphic.isActive() && (!PageBookRGraphicView.this.pinPage || getCurrentSession() == null)) );
 			this.toShow= null;
 		}
 		@Override
 		public void graphicRemoved(final ERGraphic graphic) {
 			final RGraphicSession session= getSession(graphic);
 			if (session != null) {
 				PageBookRGraphicView.super.closePage(session);
 			}
 		}
 	};

 	private boolean pinPage;

 	private final ERGraphic.Listener graphicListener= new ERGraphic.ListenerLocatorExtension() {
 		@Override
 		public void activated() {
 			updateTitle();
 		}
 		@Override
 		public void deactivated() {
 			updateTitle();
 		}
 		@Override
 		public void drawingStarted() {
 		}
 		@Override
 		public void drawingStopped() {
 		}
 		@Override
 		public void locatorStarted() {
 			updateTitle();
 		}
 		@Override
 		public void locatorStopped() {
 			updateTitle();
 		}
 	};

 	private StatusLineContributionItem positionStatusLineItem;


 	public PageBookRGraphicView() {
 	}


 	@Override
 	public void init(final IViewSite site, final @Nullable IMemento memento) throws PartInitException {
 		setSessionComparator(new RGraphicComparator());
 		super.init(site, memento);
 		this.manager= loadManager();
 	}

 	protected abstract ERGraphicsManager loadManager();

 	@Override
 	public void createPartControl(final Composite parent) {
 		super.createPartControl(parent);
 		if (this.manager != null) {
 			this.manager.addListener(this.managerListener);
 			ERGraphic active= newViewGraphic;
 			if (active != null) {
 				final List<? extends ERGraphic> graphics= this.manager.getAllGraphics();
 				for (final ERGraphic graphic : graphics) {
 					add(graphic, false);
 				}
 			}
 			else {
 				final List<? extends ERGraphic> graphics= this.manager.getAllGraphics();
 				for (final ERGraphic graphic : graphics) {
 					add(graphic, false);
 					if (graphic.isActive()) {
 						active= graphic;
 					}
 				}
 				if (active == null && !graphics.isEmpty()) {
 					active= graphics.get(graphics.size() - 1);
 				}
 			}
 			if (active != null) {
 				final RGraphicSession session= getSession(active);
 				if (session != null) {
 					showPage(session);
 				}
 			}
 		}
 	}

 	public @Nullable RGraphicSession getSession(final ERGraphic graphic) {
 		final List<RGraphicSession> sessions= getSessions();
 		for (final RGraphicSession session : sessions) {
 			if (session.getGraphic() == graphic) {
 				return session;
 			}
 		}
 		return null;
 	}

 	protected int canShowGraphic(final ERGraphic graphic) {
 		final RGraphicSession session= getCurrentSession();
 		int canShow;
 		if (session != null && session.getGraphic() == graphic) {
 			canShow= (this.pinPage) ? 20 : 10;
 		}
 		else if (this.pinPage && session != null) {
 			return -1;
 		}
 		else {
 			canShow= 1;
 		}
 		if (getViewSite().getPage().isPartVisible(this)) {
 			canShow+=2;
 		}
 		return canShow;
 	}

 	protected void add(final ERGraphic graphic, final boolean show) {
 		super.newPage(new RGraphicSession(graphic), show);
 	}

 	@Override
 	protected String getNoPageTitle() {
 		return "No graphics at this time.";
 	}

 	@Override
 	protected @Nullable IHandler2 createNewPageHandler() {
 		return null;
 	}


 	@Override
 	protected void initActions(final IServiceLocator serviceLocator, final ContextHandlers handlers) {
 		super.initActions(serviceLocator, handlers);

 		final OpenAdditionalViewHandler openViewHandler= new OpenAdditionalViewHandler(getViewSite());
 		handlers.add(".OpenView", openViewHandler);
 	}

 	@Override
 	protected void contributeToActionBars(final IServiceLocator serviceLocator, final IActionBars actionBars, final HandlerCollection handlers) {
 		super.contributeToActionBars(serviceLocator, actionBars, handlers);

 		final IMenuManager menuManager= actionBars.getMenuManager();
 		menuManager.add(new Separator("view"));
 		final IViewDescriptor viewDescriptor= PlatformUI.getWorkbench().getViewRegistry().find(getViewSite().getId());
 		menuManager.add(new HandlerContributionItem(new CommandContributionItemParameter(serviceLocator,
 				null, HandlerContributionItem.NO_COMMAND_ID, null,
 				viewDescriptor.getImageDescriptor(), null, null,
 				NLS.bind("Open Additional {0} View", viewDescriptor.getLabel()), "O", null,
 				HandlerContributionItem.STYLE_PUSH, null, false), handlers.get(".OpenView")));
 		menuManager.add(new Separator("save"));
 		menuManager.add(new Separator(ADDITIONS_GROUP_ID));

 		menuManager.add(new Separator("settings")); //$NON-NLS-1$
 		menuManager.add(new SimpleContributionItem("Preferences...", "P") {
 			@Override
 			protected void execute() throws ExecutionException {
 				final Shell shell= getViewSite().getShell();
 				final String[] preferencePages= collectContextMenuPreferencePages();
 				if (preferencePages.length > 0 && (shell == null || !shell.isDisposed())) {
 					org.eclipse.ui.dialogs.PreferencesUtil.createPreferenceDialogOn(shell, preferencePages[0], preferencePages, null).open();
 				}
 			}
 		});

 		final IToolBarManager toolBarManager= actionBars.getToolBarManager();
 		toolBarManager.insertAfter("page_control.change_page", new PinPageAction()); //$NON-NLS-1$

 		final IStatusLineManager lineManager= actionBars.getStatusLineManager();
 		this.positionStatusLineItem= new StatusLineContributionItem(RGraphicCompositeActionSet.POSITION_STATUSLINE_ITEM_ID, 20);
 		lineManager.add(this.positionStatusLineItem);
 	}

 	private String[] collectContextMenuPreferencePages() {
 		final List<String> pageIds= new ArrayList<>();
 		collectContextMenuPreferencePages(pageIds);
 		return pageIds.toArray(new String[pageIds.size()]);
 	}

 	protected void collectContextMenuPreferencePages(final List<String> pageIds) {
 	}


 	@Override
 	protected RGraphicPage doCreatePage(final RGraphicSession session) {
 		return new RGraphicPage(session.getGraphic());
 	}

 	@Override
 	protected void initPage(final IPageBookViewPage page) {
 		super.initPage(page);
 		if (page instanceof RGraphicPage) {
 			((RGraphicPage) page).init(this.positionStatusLineItem);
 		}
 	}

 	@Override
 	public void closePage(final RGraphicSession session) {
 		final IStatus status= session.getGraphic().close();
 		if (status != null && status.getSeverity() < IStatus.ERROR) {
 			return;
 		}
 		super.closePage(session);
 	}

 	@Override
 	protected void onPageShowing(final IPageBookViewPage page, final RGraphicSession session) {
 		if (session != null) {
 			session.getGraphic().addListener(this.graphicListener);
 		}
 		super.onPageShowing(page, session);
 	}

 	@Override
 	protected void onPageHiding(final IPageBookViewPage page, final RGraphicSession session) {
 		if (session != null) {
 			session.getGraphic().removeListener(this.graphicListener);
 		}
 		if (this.positionStatusLineItem != null) {
 			this.positionStatusLineItem.setText(""); //$NON-NLS-1$
 		}
 		super.onPageHiding(page, session);
 	}

 	@Override
 	public void dispose() {
 		if (this.manager != null) {
 			this.manager.removeListener(this.managerListener);
 		}
 		final RGraphicSession session= getCurrentSession();
 		if (session != null) {
 			session.getGraphic().removeListener(this.graphicListener);
 		}
 		super.dispose();
 	}

 }
	/*=============================================================================#
	# Copyright (c) 2009, 2018 Stephan Wahlbrink and others.
	#
	# This program and the accompanying materials are made available under the
	# terms of the Eclipse Public License 2.0 which is available at
	# https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
	# which is available at https://www.apache.org/licenses/LICENSE-2.0.
	#
	# SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
	#
	# Contributors:
	# Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
	#=============================================================================*/

	package org.eclipse.statet.rj.eclient.graphics;

	import static org.eclipse.statet.ecommons.ui.actions.UIActions.ADDITIONS_GROUP_ID;

	import java.util.ArrayList;
	import java.util.Comparator;
	import java.util.List;

	import org.eclipse.core.commands.AbstractHandler;
	import org.eclipse.core.commands.ExecutionEvent;
	import org.eclipse.core.commands.ExecutionException;
	import org.eclipse.core.commands.IHandler2;
	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.jface.action.IMenuManager;
	import org.eclipse.jface.action.IStatusLineManager;
	import org.eclipse.jface.action.IToolBarManager;
	import org.eclipse.jface.action.Separator;
	import org.eclipse.jface.action.StatusLineContributionItem;
	import org.eclipse.jface.resource.ImageDescriptor;
	import org.eclipse.osgi.util.NLS;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.ui.IActionBars;
	import org.eclipse.ui.IMemento;
	import org.eclipse.ui.IViewReference;
	import org.eclipse.ui.IViewSite;
	import org.eclipse.ui.IWorkbenchPage;
	import org.eclipse.ui.PartInitException;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.menus.CommandContributionItemParameter;
	import org.eclipse.ui.part.IPageBookViewPage;
	import org.eclipse.ui.services.IServiceLocator;
	import org.eclipse.ui.statushandlers.StatusManager;
	import org.eclipse.ui.views.IViewDescriptor;

	import org.eclipse.statet.jcommons.lang.NonNullByDefault;
	import org.eclipse.statet.jcommons.lang.Nullable;

	import org.eclipse.statet.ecommons.ts.core.Tool;
	import org.eclipse.statet.ecommons.ui.SharedUIResources;
	import org.eclipse.statet.ecommons.ui.actions.HandlerCollection;
	import org.eclipse.statet.ecommons.ui.actions.HandlerContributionItem;
	import org.eclipse.statet.ecommons.ui.actions.SimpleContributionItem;
	import org.eclipse.statet.ecommons.ui.mpbv.ManagedPageBookView;
	import org.eclipse.statet.ecommons.ui.mpbv.PageBookSession;
	import org.eclipse.statet.ecommons.ui.util.UIAccess;
	import org.eclipse.statet.ecommons.ui.workbench.ContextHandlers;

	import org.eclipse.statet.rj.eclient.core.AbstractRToolRunnable;
	import org.eclipse.statet.rj.eclient.core.RToolService;


	/**
	* Multi page view for R graphics.
	* <p>
	* No view is registered by this plug-in.</p>
	*/
	@NonNullByDefault
	public abstract class PageBookRGraphicView extends ManagedPageBookView<PageBookRGraphicView.RGraphicSession> {


	public class RGraphicSession implements PageBookSession {


	private final ERGraphic graphic;


	public RGraphicSession(final ERGraphic graphic) {
	this.graphic= graphic;
	}


	@Override
	public String getLabel() {
	return this.graphic.getLabel();
	}

	@Override
	public @Nullable ImageDescriptor getImageDescriptor() {
	return ImageDescriptor.createFromImage(getTitleImage());
	}

	public ERGraphic getGraphic() {
	return this.graphic;
	}

	}

	public static class ShowRequiredViewListener implements ERGraphicsManager.ListenerShowExtension {


	private final String viewId;


	public ShowRequiredViewListener(final String viewId) {
	this.viewId= viewId;
	}


	@Override
	public int canShowGraphic(final ERGraphic graphic) {
	return 0;
	}

	private static String getId(final IViewReference ref) {
	// E-Bug #405563
	final String id= ref.getId();
	final int idx= id.indexOf(':');
	return (idx >= 0) ? id.substring(0, idx) : id;
	}

	@Override
	public void showGraphic(final ERGraphic graphic) {
	try {
	final IWorkbenchPage page= getBestPage(graphic);
	String secondaryId= ""; //$NON-NLS-1$
	final IViewReference[] refs= page.getViewReferences();
	for (int i= 0; i < refs.length; i++) { // search views not yet instanced
	if (this.viewId.equals(getId(refs[i])) && refs[i].getView(false) == null) {
	if (refs[i].getSecondaryId() == null) {
	secondaryId= null;
	break;
	}
	if (secondaryId == "") { //$NON-NLS-1$
	secondaryId= refs[i].getSecondaryId();
	}
	}
	}
	if (secondaryId == "") { //$NON-NLS-1$
	secondaryId= "t"+System.currentTimeMillis(); //$NON-NLS-1$
	}
	newViewGraphic= graphic;
	page.showView(this.viewId, secondaryId, IWorkbenchPage.VIEW_VISIBLE );
	}
	catch (final PartInitException e) {
	StatusManager.getManager().handle(new Status(IStatus.ERROR, RGraphics.BUNDLE_ID,
	"An error occurred when opening a new R Graphics view.", e ));
	}
	finally {
	newViewGraphic= null;
	}
	}

	protected IWorkbenchPage getBestPage(final ERGraphic graphic) {
	return UIAccess.getActiveWorkbenchPage(true);
	}

	@Override
	public void graphicAdded(final ERGraphic graphic) {
	}

	@Override
	public void graphicRemoved(final ERGraphic graphic) {
	}

	}


	protected static abstract class NewDevHandler extends AbstractHandler {


	public NewDevHandler() {
	}


	protected abstract Tool getTool() throws CoreException;

	@Override
	public @Nullable Object execute(final ExecutionEvent event) throws ExecutionException {
	try {
	final Tool tool= getTool();
	if (tool != null) {
	tool.getQueue().add(new AbstractRToolRunnable(
	"r/rj/gd/new", "New R Graphic") { //$NON-NLS-1$

	@Override
	public void run(final RToolService r,
	final IProgressMonitor monitor) throws CoreException {
	r.evalVoid("rj.gd::rj.GD()", monitor); //$NON-NLS-1$
	}

	});
	}
	}
	catch (final CoreException e) {
	if (e.getStatus().getSeverity() != IStatus.CANCEL) {
	StatusManager.getManager().handle(new Status(IStatus.ERROR, RGraphics.BUNDLE_ID, -1,
	"An error occurrend when creating a new graphic device.", e),
	StatusManager.LOG \| StatusManager.SHOW);
	}
	}
	return null;
	}

	}


	private static class RGraphicComparator implements Comparator<RGraphicSession> {

	public RGraphicComparator() {
	}

	@Override
	public int compare(final RGraphicSession o1, final RGraphicSession o2) {
	final Tool handle1= o1.graphic.getRHandle();
	final Tool handle2= o2.graphic.getRHandle();
	if (handle1 == null) {
	if (handle2 == null) {
	return 0;
	}
	return Integer.MIN_VALUE;
	}
	else if (handle2 == null) {
	return Integer.MAX_VALUE;
	}
	if (handle1 != handle2) {
	final int diff= handle1.getLabel(Tool.LONG_LABEL).compareTo(handle2.getLabel(Tool.LONG_LABEL));
	if (diff != 0) {
	return diff;
	}
	}
	return o1.graphic.getDevId() - o2.graphic.getDevId();
	}

	}


	private static class OpenAdditionalViewHandler extends AbstractHandler {

	private final IViewSite viewSite;

	public OpenAdditionalViewHandler(final IViewSite viewSite) {
	this.viewSite= viewSite;
	}

	@Override
	public @Nullable Object execute(final ExecutionEvent event) throws ExecutionException {
	try {
	final String secondaryId= "t" + System.currentTimeMillis(); //$NON-NLS-1$
	this.viewSite.getWorkbenchWindow().getActivePage().showView(this.viewSite.getId(),
	secondaryId, IWorkbenchPage.VIEW_ACTIVATE );
	}
	catch (final PartInitException e) {
	StatusManager.getManager().handle(new Status(IStatus.ERROR, RGraphics.BUNDLE_ID, -1,
	"An error occurred when opening an additional R graphics view.", e));
	}
	return null;
	}

	}

	private class PinPageAction extends SimpleContributionItem {

	public PinPageAction() {
	super("Pin Graphic Page", "P",
	SharedUIResources.getImages().getDescriptor(SharedUIResources.LOCTOOL_PIN_PAGE_IMAGE_ID),
	SharedUIResources.getImages().getDescriptor(SharedUIResources.LOCTOOLD_PIN_PAGE_IMAGE_ID),
	SimpleContributionItem.STYLE_CHECK );
	setChecked(PageBookRGraphicView.this.pinPage);
	}

	@Override
	protected void execute() throws ExecutionException {
	PageBookRGraphicView.this.pinPage= !PageBookRGraphicView.this.pinPage;
	setChecked(PageBookRGraphicView.this.pinPage);
	}

	}


	private static @Nullable ERGraphic newViewGraphic;

	private ERGraphicsManager manager;
	private final ERGraphicsManager.ListenerShowExtension managerListener= new ERGraphicsManager.ListenerShowExtension() {
	private @Nullable ERGraphic toShow;
	@Override
	public int canShowGraphic(final ERGraphic graphic) {
	return PageBookRGraphicView.this.canShowGraphic(graphic);
	}
	@Override
	public void showGraphic(final ERGraphic graphic) {
	this.toShow= graphic;
	final IViewSite site= getViewSite();
	try {
	site.getPage().showView(site.getId(), site.getSecondaryId(), IWorkbenchPage.VIEW_VISIBLE);
	}
	catch (final PartInitException e) {}
	}
	@Override
	public void graphicAdded(final ERGraphic graphic) {
	add(graphic, graphic == this.toShow
	\|\| (graphic.isActive() && (!PageBookRGraphicView.this.pinPage \|\| getCurrentSession() == null)) );
	this.toShow= null;
	}
	@Override
	public void graphicRemoved(final ERGraphic graphic) {
	final RGraphicSession session= getSession(graphic);
	if (session != null) {
	PageBookRGraphicView.super.closePage(session);
	}
	}
	};

	private boolean pinPage;

	private final ERGraphic.Listener graphicListener= new ERGraphic.ListenerLocatorExtension() {
	@Override
	public void activated() {
	updateTitle();
	}
	@Override
	public void deactivated() {
	updateTitle();
	}
	@Override
	public void drawingStarted() {
	}
	@Override
	public void drawingStopped() {
	}
	@Override
	public void locatorStarted() {
	updateTitle();
	}
	@Override
	public void locatorStopped() {
	updateTitle();
	}
	};

	private StatusLineContributionItem positionStatusLineItem;


	public PageBookRGraphicView() {
	}


	@Override
	public void init(final IViewSite site, final @Nullable IMemento memento) throws PartInitException {
	setSessionComparator(new RGraphicComparator());
	super.init(site, memento);
	this.manager= loadManager();
	}

	protected abstract ERGraphicsManager loadManager();

	@Override
	public void createPartControl(final Composite parent) {
	super.createPartControl(parent);
	if (this.manager != null) {
	this.manager.addListener(this.managerListener);
	ERGraphic active= newViewGraphic;
	if (active != null) {
	final List<? extends ERGraphic> graphics= this.manager.getAllGraphics();
	for (final ERGraphic graphic : graphics) {
	add(graphic, false);
	}
	}
	else {
	final List<? extends ERGraphic> graphics= this.manager.getAllGraphics();
	for (final ERGraphic graphic : graphics) {
	add(graphic, false);
	if (graphic.isActive()) {
	active= graphic;
	}
	}
	if (active == null && !graphics.isEmpty()) {
	active= graphics.get(graphics.size() - 1);
	}
	}
	if (active != null) {
	final RGraphicSession session= getSession(active);
	if (session != null) {
	showPage(session);
	}
	}
	}
	}

	public @Nullable RGraphicSession getSession(final ERGraphic graphic) {
	final List<RGraphicSession> sessions= getSessions();
	for (final RGraphicSession session : sessions) {
	if (session.getGraphic() == graphic) {
	return session;
	}
	}
	return null;
	}

	protected int canShowGraphic(final ERGraphic graphic) {
	final RGraphicSession session= getCurrentSession();
	int canShow;
	if (session != null && session.getGraphic() == graphic) {
	canShow= (this.pinPage) ? 20 : 10;
	}
	else if (this.pinPage && session != null) {
	return -1;
	}
	else {
	canShow= 1;
	}
	if (getViewSite().getPage().isPartVisible(this)) {
	canShow+=2;
	}
	return canShow;
	}

	protected void add(final ERGraphic graphic, final boolean show) {
	super.newPage(new RGraphicSession(graphic), show);
	}

	@Override
	protected String getNoPageTitle() {
	return "No graphics at this time.";
	}

	@Override
	protected @Nullable IHandler2 createNewPageHandler() {
	return null;
	}


	@Override
	protected void initActions(final IServiceLocator serviceLocator, final ContextHandlers handlers) {
	super.initActions(serviceLocator, handlers);

	final OpenAdditionalViewHandler openViewHandler= new OpenAdditionalViewHandler(getViewSite());
	handlers.add(".OpenView", openViewHandler);
	}

	@Override
	protected void contributeToActionBars(final IServiceLocator serviceLocator, final IActionBars actionBars, final HandlerCollection handlers) {
	super.contributeToActionBars(serviceLocator, actionBars, handlers);

	final IMenuManager menuManager= actionBars.getMenuManager();
	menuManager.add(new Separator("view"));
	final IViewDescriptor viewDescriptor= PlatformUI.getWorkbench().getViewRegistry().find(getViewSite().getId());
	menuManager.add(new HandlerContributionItem(new CommandContributionItemParameter(serviceLocator,
	null, HandlerContributionItem.NO_COMMAND_ID, null,
	viewDescriptor.getImageDescriptor(), null, null,
	NLS.bind("Open Additional {0} View", viewDescriptor.getLabel()), "O", null,
	HandlerContributionItem.STYLE_PUSH, null, false), handlers.get(".OpenView")));
	menuManager.add(new Separator("save"));
	menuManager.add(new Separator(ADDITIONS_GROUP_ID));

	menuManager.add(new Separator("settings")); //$NON-NLS-1$
	menuManager.add(new SimpleContributionItem("Preferences...", "P") {
	@Override
	protected void execute() throws ExecutionException {
	final Shell shell= getViewSite().getShell();
	final String[] preferencePages= collectContextMenuPreferencePages();
	if (preferencePages.length > 0 && (shell == null \|\| !shell.isDisposed())) {
	org.eclipse.ui.dialogs.PreferencesUtil.createPreferenceDialogOn(shell, preferencePages[0], preferencePages, null).open();
	}
	}
	});

	final IToolBarManager toolBarManager= actionBars.getToolBarManager();
	toolBarManager.insertAfter("page_control.change_page", new PinPageAction()); //$NON-NLS-1$

	final IStatusLineManager lineManager= actionBars.getStatusLineManager();
	this.positionStatusLineItem= new StatusLineContributionItem(RGraphicCompositeActionSet.POSITION_STATUSLINE_ITEM_ID, 20);
	lineManager.add(this.positionStatusLineItem);
	}

	private String[] collectContextMenuPreferencePages() {
	final List<String> pageIds= new ArrayList<>();
	collectContextMenuPreferencePages(pageIds);
	return pageIds.toArray(new String[pageIds.size()]);
	}

	protected void collectContextMenuPreferencePages(final List<String> pageIds) {
	}


	@Override
	protected RGraphicPage doCreatePage(final RGraphicSession session) {
	return new RGraphicPage(session.getGraphic());
	}

	@Override
	protected void initPage(final IPageBookViewPage page) {
	super.initPage(page);
	if (page instanceof RGraphicPage) {
	((RGraphicPage) page).init(this.positionStatusLineItem);
	}
	}

	@Override
	public void closePage(final RGraphicSession session) {
	final IStatus status= session.getGraphic().close();
	if (status != null && status.getSeverity() < IStatus.ERROR) {
	return;
	}
	super.closePage(session);
	}

	@Override
	protected void onPageShowing(final IPageBookViewPage page, final RGraphicSession session) {
	if (session != null) {
	session.getGraphic().addListener(this.graphicListener);
	}
	super.onPageShowing(page, session);
	}

	@Override
	protected void onPageHiding(final IPageBookViewPage page, final RGraphicSession session) {
	if (session != null) {
	session.getGraphic().removeListener(this.graphicListener);
	}
	if (this.positionStatusLineItem != null) {
	this.positionStatusLineItem.setText(""); //$NON-NLS-1$
	}
	super.onPageHiding(page, session);
	}

	@Override
	public void dispose() {
	if (this.manager != null) {
	this.manager.removeListener(this.managerListener);
	}
	final RGraphicSession session= getCurrentSession();
	if (session != null) {
	session.getGraphic().removeListener(this.graphicListener);
	}
	super.dispose();
	}

	}