r/org.eclipse.statet.r.apps/src/org/eclipse/statet/internal/r/apps/ui/launching/AppControlConfigViewTab.java - statet/org.eclipse.statet-r - Git at Google

 /*=============================================================================#
  # Copyright (c) 2017, 2019 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.internal.r.apps.ui.launching;

 import static org.eclipse.statet.jcommons.lang.ObjectUtils.nonNullAssert;

 import static org.eclipse.statet.ecommons.databinding.core.observable.ObservableUtils.typed;

 import static org.eclipse.statet.internal.r.apps.ui.launching.AppControlConfigs.VARIABLES_CODE_ATTR_NAME;
 import static org.eclipse.statet.internal.r.apps.ui.launching.AppControlConfigs.VARIABLES_VIEWER_ACTION_ATTR_NAME;
 import static org.eclipse.statet.internal.r.apps.ui.launching.AppControlConfigs.VIEWER_ID_ATTR_NAME;

 import org.eclipse.core.databinding.DataBindingContext;
 import org.eclipse.core.databinding.observable.Realm;
 import org.eclipse.core.databinding.observable.value.IObservableValue;
 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
 import org.eclipse.core.databinding.observable.value.WritableValue;
 import org.eclipse.debug.core.ILaunchConfiguration;
 import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
 import org.eclipse.jface.databinding.swt.typed.WidgetProperties;
 import org.eclipse.jface.databinding.viewers.typed.ViewerProperties;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.preference.PreferenceDialog;
 import org.eclipse.jface.viewers.ArrayContentProvider;
 import org.eclipse.jface.viewers.ComboViewer;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.StackLayout;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Image;
 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.Group;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Link;
 import org.eclipse.ui.PlatformUI;

 import org.eclipse.statet.jcommons.collections.ImCollections;
 import org.eclipse.statet.jcommons.collections.ImList;
 import org.eclipse.statet.jcommons.lang.NonNullByDefault;
 import org.eclipse.statet.jcommons.lang.Nullable;

 import org.eclipse.statet.ecommons.debug.ui.config.LaunchConfigTabWithDbc;
 import org.eclipse.statet.ecommons.templates.TemplateVariableProcessor;
 import org.eclipse.statet.ecommons.ui.util.LayoutUtils;

 import org.eclipse.statet.internal.r.apps.ui.Messages;
 import org.eclipse.statet.ltk.ui.sourceediting.SnippetEditor;
 import org.eclipse.statet.ltk.ui.sourceediting.SnippetEditor1;
 import org.eclipse.statet.r.apps.ui.RAppUIResources;
 import org.eclipse.statet.r.core.RCore;
 import org.eclipse.statet.r.launching.ui.RLaunchingUI;
 import org.eclipse.statet.r.ui.sourceediting.RSourceViewerConfigurator;
 import org.eclipse.statet.r.ui.sourceediting.RTemplateSourceViewerConfigurator;


 @NonNullByDefault
 public class AppControlConfigViewTab extends LaunchConfigTabWithDbc
 		implements IValueChangeListener<Object> {


 	static void initDefaults(final ILaunchConfigurationWorkingCopy config) {
 		config.setAttribute(AppControlConfigs.VIEWER_ID_ATTR_NAME, AppControlConfigs.WORKBENCH_VIEW_BROWSER_ID);
 		config.setAttribute(AppControlConfigs.VARIABLES_VIEWER_ACTION_ATTR_NAME, AppControlConfigs.SHOW_ACTION_ID);
 	}


 	private class ViewerItem {


 		private final @Nullable String id;

 		private final String label;

 		private @Nullable Composite detailControl;


 		public ViewerItem(final @Nullable String id, final String label) {
 			this.id= id;
 			this.label= label;
 		}


 		public @Nullable String getId() {
 			return this.id;
 		}

 		@Override // for LabelProvider
 		public String toString() {
 			return this.label;
 		}

 		public @Nullable Composite enable() {
 			Composite control= this.detailControl;
 			if (this.id != null) {
 				if (control == null) {
 					control= createControl(AppControlConfigViewTab.this.viewerDetailControl);
 					this.detailControl= control;
 				}
 			}
 			return control;
 		}

 		public void disable() {
 		}

 		protected Composite createControl(final Composite parent) {
 			final Composite composite= new Composite(parent, SWT.NONE);
 			return composite;
 		}

 	}


 	private ImList<ViewerItem> viewers;

 	private IObservableValue<ViewerItem> viewerValue;

 	private IObservableValue<String> variablesCodeValue;
 	private IObservableValue<Boolean> variablesActionValue;

 	private ComboViewer viewerSelectionViewer;
 	private StackLayout viewerDetailLayout;
 	private Composite viewerDetailControl;

 	private SnippetEditor variablesCodeEditor;
 	private Button variablesActionControl;


 	public AppControlConfigViewTab() {

 		final Realm realm= getRealm();
 		this.viewerValue= new WritableValue<>(realm, null, String.class);
 		this.viewerValue.addValueChangeListener(this);

 		this.viewers= ImCollections.newList(
 				new ViewerItem(null, Messages.Operation_Viewer_None_label),
 				new ViewerItem(AppControlConfigs.WORKBENCH_VIEW_BROWSER_ID,
 						Messages.Operation_Viewer_WorkbenchView_label),
 				new ViewerItem(AppControlConfigs.WORKBENCH_EXTERNAL_BROWSER_ID,
 						Messages.Operation_Viewer_WorkbenchExternal_label) {
 					@Override
 					protected Composite createControl(final Composite parent) {
 						final Composite composite= super.createControl(parent);

 						composite.setLayout(LayoutUtils.newCompositeGrid(1));

 						LayoutUtils.addSmallFiller(composite, true);

 						final Link link= new Link(composite, SWT.NONE);
 						link.setText("Global preferences: "
 								+ "<a href=\"org.eclipse.ui.browser.preferencePage\">Web Browser</a>.");
 						composite.setLayoutData(new GridData(SWT.FILL, SWT.BOTTOM, true, false));
 						link.addSelectionListener(new SelectionAdapter() {
 							@Override
 							public void widgetSelected(final SelectionEvent e) {
 								final PreferenceDialog dialog= org.eclipse.ui.dialogs.PreferencesUtil.createPreferenceDialogOn(null, e.text, null, null);
 								if (dialog != null) {
 									dialog.open();
 								}
 							}
 						});

 						return composite;
 					}
 				});

 		this.variablesCodeValue= new WritableValue<>(realm, "", String.class); //$NON-NLS-1$
 		this.variablesActionValue= new WritableValue<>(realm, true, Boolean.TYPE);
 	}


 	@Override
 	public Image getImage() {
 		return nonNullAssert(RAppUIResources.INSTANCE.getImage(RAppUIResources.TOOL_VIEW_IMAGE_ID));
 	}

 	@Override
 	public String getName() {
 		return Messages.Operation_ViewTab_name;
 	}

 	public String getLabel() {
 		return Messages.Operation_ViewTab_label;
 	}


 	@Override
 	public void createControl(final Composite parent) {
 		final Composite mainComposite= new Composite(parent, SWT.NONE);
 		setControl(mainComposite);
 		mainComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 		mainComposite.setLayout(new GridLayout());

 		{	final Label label= new Label(mainComposite, SWT.NONE);
 			label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
 			label.setText(getLabel() + ':');
 		}
 		{	final Composite composite= createViewerSettings(mainComposite);
 			composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 		}
 		{	final Composite composite= createVariablesSettings(mainComposite);
 			composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 		}
 		Dialog.applyDialogFont(parent);

 		initBindings();
 	}


 	private ViewerItem getViewerItem(final String id) {
 		for (final ViewerItem item : this.viewers) {
 			if (item.getId() == id) {
 				return item;
 			}
 		}
 		return this.viewers.get(0);
 	}

 	private Composite createViewerSettings(final Composite parent) {
 		final Group composite= new Group(parent, SWT.NONE);
 		composite.setText(Messages.Operation_ViewTab_Operation_label + ':');
 		composite.setLayout(LayoutUtils.newGroupGrid(1));

 		{	final ComboViewer viewer= new ComboViewer(composite);

 			viewer.setLabelProvider(new LabelProvider());
 			viewer.setContentProvider(new ArrayContentProvider());
 			viewer.setInput(this.viewers);

 			viewer.getControl().setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
 			this.viewerSelectionViewer= viewer;
 		}
 		{	final Composite detailControl= new Composite(composite, SWT.NONE);

 			this.viewerDetailLayout= new StackLayout();
 			detailControl.setLayout(this.viewerDetailLayout);

 			detailControl.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 			this.viewerDetailControl= detailControl;
 		}

 		return composite;
 	}

 	private Composite createVariablesSettings(final Composite parent) {
 		final Group composite= new Group(parent, SWT.NONE);
 		composite.setText(Messages.Operation_Variables_label + ':');
 		composite.setLayout(LayoutUtils.newGroupGrid(2));

 		{	final Label label= new Label(composite, SWT.NONE);
 			label.setText(Messages.Operation_Variables_RCode_label + ':');
 			label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false));

 			final TemplateVariableProcessor templateVariableProcessor= new TemplateVariableProcessor();
 			final RSourceViewerConfigurator configurator= new RTemplateSourceViewerConfigurator(
 					RCore.getWorkbenchAccess(),
 					templateVariableProcessor );
 			final SnippetEditor1 editor= new SnippetEditor1(configurator, null,
 					PlatformUI.getWorkbench(), RLaunchingUI.LAUNCH_CONFIG_QUALIFIER );
 			editor.create(composite, SnippetEditor.DEFAULT_SINGLE_LINE_STYLE);
 			final GridData gd= new GridData(SWT.FILL, SWT.FILL, true, false);
 			gd.heightHint= LayoutUtils.hintHeight(editor.getSourceViewer().getTextWidget(), 1);
 			editor.getControl().setLayoutData(gd);
 			this.variablesCodeEditor= editor;
 		}

 		{	final Button button= new Button(composite, SWT.CHECK);
 			button.setText(Messages.Operation_Variables_ShowView_label);

 			button.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
 			this.variablesActionControl= button;
 		}

 		return composite;
 	}


 	@Override
 	protected void addBindings(final DataBindingContext dbc) {
 		dbc.bindValue(
 				ViewerProperties.singleSelection()
 						.observe(this.viewerSelectionViewer),
 				this.viewerValue );

 		dbc.bindValue(
 				WidgetProperties.text(SWT.Modify)
 						.observe(this.variablesCodeEditor.getTextControl()),
 				this.variablesCodeValue );
 		dbc.bindValue(
 				WidgetProperties.buttonSelection()
 						.observe(this.variablesActionControl),
 				this.variablesActionValue );
 	}

 	@Override
 	public void handleValueChange(final ValueChangeEvent<?> event) {
 		if (event.getObservable() == this.viewerValue) {
 			final ViewerItem oldItem= typed(event, this.viewerValue).diff.getOldValue();
 			if (oldItem != null) {
 				oldItem.disable();
 			}

 			final ViewerItem newItem= typed(event, this.viewerValue).diff.getNewValue();
 			if (newItem != null) {
 				this.viewerDetailLayout.topControl= newItem.enable();
 			}
 			else {
 				this.viewerDetailLayout.topControl= null;
 			}
 			this.viewerDetailControl.layout();
 		}
 	}


 	@Override
 	public void setDefaults(final ILaunchConfigurationWorkingCopy configuration) {
 		initDefaults(configuration);
 	}

 	@Override
 	protected void doInitialize(final ILaunchConfiguration configuration) {
 		{	final String id= readAttribute(configuration,
 					VIEWER_ID_ATTR_NAME,
 					"") //$NON-NLS-1$
 					.intern();
 			final ViewerItem item= getViewerItem(id);
 			this.viewerValue.setValue(item);
 		}

 		{	final String code= readAttribute(configuration,
 					VARIABLES_CODE_ATTR_NAME,
 					"" ); //$NON-NLS-1$
 			this.variablesCodeValue.setValue(code);
 		}
 		{	final String action= readAttribute(configuration,
 					VARIABLES_VIEWER_ACTION_ATTR_NAME,
 					""); //$NON-NLS-1$
 			this.variablesActionValue.setValue(action.equals(AppControlConfigs.SHOW_ACTION_ID));
 		}
 	}

 	@Override
 	protected void doSave(final ILaunchConfigurationWorkingCopy configuration) {
 		{	final ViewerItem item= this.viewerValue.getValue();
 			configuration.setAttribute(VIEWER_ID_ATTR_NAME, item.getId());
 		}

 		{	final String code= this.variablesCodeValue.getValue();
 			configuration.setAttribute(VARIABLES_CODE_ATTR_NAME, code);
 		}
 		{	final Boolean enabled= this.variablesActionValue.getValue();
 			configuration.setAttribute(VARIABLES_VIEWER_ACTION_ATTR_NAME,
 					(enabled) ? AppControlConfigs.SHOW_ACTION_ID : null );
 		}
 	}

 }
	/*=============================================================================#
	# Copyright (c) 2017, 2019 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.internal.r.apps.ui.launching;

	import static org.eclipse.statet.jcommons.lang.ObjectUtils.nonNullAssert;

	import static org.eclipse.statet.ecommons.databinding.core.observable.ObservableUtils.typed;

	import static org.eclipse.statet.internal.r.apps.ui.launching.AppControlConfigs.VARIABLES_CODE_ATTR_NAME;
	import static org.eclipse.statet.internal.r.apps.ui.launching.AppControlConfigs.VARIABLES_VIEWER_ACTION_ATTR_NAME;
	import static org.eclipse.statet.internal.r.apps.ui.launching.AppControlConfigs.VIEWER_ID_ATTR_NAME;

	import org.eclipse.core.databinding.DataBindingContext;
	import org.eclipse.core.databinding.observable.Realm;
	import org.eclipse.core.databinding.observable.value.IObservableValue;
	import org.eclipse.core.databinding.observable.value.IValueChangeListener;
	import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
	import org.eclipse.core.databinding.observable.value.WritableValue;
	import org.eclipse.debug.core.ILaunchConfiguration;
	import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
	import org.eclipse.jface.databinding.swt.typed.WidgetProperties;
	import org.eclipse.jface.databinding.viewers.typed.ViewerProperties;
	import org.eclipse.jface.dialogs.Dialog;
	import org.eclipse.jface.preference.PreferenceDialog;
	import org.eclipse.jface.viewers.ArrayContentProvider;
	import org.eclipse.jface.viewers.ComboViewer;
	import org.eclipse.jface.viewers.LabelProvider;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.StackLayout;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.graphics.Image;
	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.Group;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Link;
	import org.eclipse.ui.PlatformUI;

	import org.eclipse.statet.jcommons.collections.ImCollections;
	import org.eclipse.statet.jcommons.collections.ImList;
	import org.eclipse.statet.jcommons.lang.NonNullByDefault;
	import org.eclipse.statet.jcommons.lang.Nullable;

	import org.eclipse.statet.ecommons.debug.ui.config.LaunchConfigTabWithDbc;
	import org.eclipse.statet.ecommons.templates.TemplateVariableProcessor;
	import org.eclipse.statet.ecommons.ui.util.LayoutUtils;

	import org.eclipse.statet.internal.r.apps.ui.Messages;
	import org.eclipse.statet.ltk.ui.sourceediting.SnippetEditor;
	import org.eclipse.statet.ltk.ui.sourceediting.SnippetEditor1;
	import org.eclipse.statet.r.apps.ui.RAppUIResources;
	import org.eclipse.statet.r.core.RCore;
	import org.eclipse.statet.r.launching.ui.RLaunchingUI;
	import org.eclipse.statet.r.ui.sourceediting.RSourceViewerConfigurator;
	import org.eclipse.statet.r.ui.sourceediting.RTemplateSourceViewerConfigurator;


	@NonNullByDefault
	public class AppControlConfigViewTab extends LaunchConfigTabWithDbc
	implements IValueChangeListener<Object> {


	static void initDefaults(final ILaunchConfigurationWorkingCopy config) {
	config.setAttribute(AppControlConfigs.VIEWER_ID_ATTR_NAME, AppControlConfigs.WORKBENCH_VIEW_BROWSER_ID);
	config.setAttribute(AppControlConfigs.VARIABLES_VIEWER_ACTION_ATTR_NAME, AppControlConfigs.SHOW_ACTION_ID);
	}


	private class ViewerItem {


	private final @Nullable String id;

	private final String label;

	private @Nullable Composite detailControl;


	public ViewerItem(final @Nullable String id, final String label) {
	this.id= id;
	this.label= label;
	}


	public @Nullable String getId() {
	return this.id;
	}

	@Override // for LabelProvider
	public String toString() {
	return this.label;
	}

	public @Nullable Composite enable() {
	Composite control= this.detailControl;
	if (this.id != null) {
	if (control == null) {
	control= createControl(AppControlConfigViewTab.this.viewerDetailControl);
	this.detailControl= control;
	}
	}
	return control;
	}

	public void disable() {
	}

	protected Composite createControl(final Composite parent) {
	final Composite composite= new Composite(parent, SWT.NONE);
	return composite;
	}

	}


	private ImList<ViewerItem> viewers;

	private IObservableValue<ViewerItem> viewerValue;

	private IObservableValue<String> variablesCodeValue;
	private IObservableValue<Boolean> variablesActionValue;

	private ComboViewer viewerSelectionViewer;
	private StackLayout viewerDetailLayout;
	private Composite viewerDetailControl;

	private SnippetEditor variablesCodeEditor;
	private Button variablesActionControl;


	public AppControlConfigViewTab() {

	final Realm realm= getRealm();
	this.viewerValue= new WritableValue<>(realm, null, String.class);
	this.viewerValue.addValueChangeListener(this);

	this.viewers= ImCollections.newList(
	new ViewerItem(null, Messages.Operation_Viewer_None_label),
	new ViewerItem(AppControlConfigs.WORKBENCH_VIEW_BROWSER_ID,
	Messages.Operation_Viewer_WorkbenchView_label),
	new ViewerItem(AppControlConfigs.WORKBENCH_EXTERNAL_BROWSER_ID,
	Messages.Operation_Viewer_WorkbenchExternal_label) {
	@Override
	protected Composite createControl(final Composite parent) {
	final Composite composite= super.createControl(parent);

	composite.setLayout(LayoutUtils.newCompositeGrid(1));

	LayoutUtils.addSmallFiller(composite, true);

	final Link link= new Link(composite, SWT.NONE);
	link.setText("Global preferences: "
	+ "<a href=\"org.eclipse.ui.browser.preferencePage\">Web Browser</a>.");
	composite.setLayoutData(new GridData(SWT.FILL, SWT.BOTTOM, true, false));
	link.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(final SelectionEvent e) {
	final PreferenceDialog dialog= org.eclipse.ui.dialogs.PreferencesUtil.createPreferenceDialogOn(null, e.text, null, null);
	if (dialog != null) {
	dialog.open();
	}
	}
	});

	return composite;
	}
	});

	this.variablesCodeValue= new WritableValue<>(realm, "", String.class); //$NON-NLS-1$
	this.variablesActionValue= new WritableValue<>(realm, true, Boolean.TYPE);
	}


	@Override
	public Image getImage() {
	return nonNullAssert(RAppUIResources.INSTANCE.getImage(RAppUIResources.TOOL_VIEW_IMAGE_ID));
	}

	@Override
	public String getName() {
	return Messages.Operation_ViewTab_name;
	}

	public String getLabel() {
	return Messages.Operation_ViewTab_label;
	}


	@Override
	public void createControl(final Composite parent) {
	final Composite mainComposite= new Composite(parent, SWT.NONE);
	setControl(mainComposite);
	mainComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	mainComposite.setLayout(new GridLayout());

	{ final Label label= new Label(mainComposite, SWT.NONE);
	label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
	label.setText(getLabel() + ':');
	}
	{ final Composite composite= createViewerSettings(mainComposite);
	composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	}
	{ final Composite composite= createVariablesSettings(mainComposite);
	composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	}
	Dialog.applyDialogFont(parent);

	initBindings();
	}


	private ViewerItem getViewerItem(final String id) {
	for (final ViewerItem item : this.viewers) {
	if (item.getId() == id) {
	return item;
	}
	}
	return this.viewers.get(0);
	}

	private Composite createViewerSettings(final Composite parent) {
	final Group composite= new Group(parent, SWT.NONE);
	composite.setText(Messages.Operation_ViewTab_Operation_label + ':');
	composite.setLayout(LayoutUtils.newGroupGrid(1));

	{ final ComboViewer viewer= new ComboViewer(composite);

	viewer.setLabelProvider(new LabelProvider());
	viewer.setContentProvider(new ArrayContentProvider());
	viewer.setInput(this.viewers);

	viewer.getControl().setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
	this.viewerSelectionViewer= viewer;
	}
	{ final Composite detailControl= new Composite(composite, SWT.NONE);

	this.viewerDetailLayout= new StackLayout();
	detailControl.setLayout(this.viewerDetailLayout);

	detailControl.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	this.viewerDetailControl= detailControl;
	}

	return composite;
	}

	private Composite createVariablesSettings(final Composite parent) {
	final Group composite= new Group(parent, SWT.NONE);
	composite.setText(Messages.Operation_Variables_label + ':');
	composite.setLayout(LayoutUtils.newGroupGrid(2));

	{ final Label label= new Label(composite, SWT.NONE);
	label.setText(Messages.Operation_Variables_RCode_label + ':');
	label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false));

	final TemplateVariableProcessor templateVariableProcessor= new TemplateVariableProcessor();
	final RSourceViewerConfigurator configurator= new RTemplateSourceViewerConfigurator(
	RCore.getWorkbenchAccess(),
	templateVariableProcessor );
	final SnippetEditor1 editor= new SnippetEditor1(configurator, null,
	PlatformUI.getWorkbench(), RLaunchingUI.LAUNCH_CONFIG_QUALIFIER );
	editor.create(composite, SnippetEditor.DEFAULT_SINGLE_LINE_STYLE);
	final GridData gd= new GridData(SWT.FILL, SWT.FILL, true, false);
	gd.heightHint= LayoutUtils.hintHeight(editor.getSourceViewer().getTextWidget(), 1);
	editor.getControl().setLayoutData(gd);
	this.variablesCodeEditor= editor;
	}

	{ final Button button= new Button(composite, SWT.CHECK);
	button.setText(Messages.Operation_Variables_ShowView_label);

	button.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
	this.variablesActionControl= button;
	}

	return composite;
	}


	@Override
	protected void addBindings(final DataBindingContext dbc) {
	dbc.bindValue(
	ViewerProperties.singleSelection()
	.observe(this.viewerSelectionViewer),
	this.viewerValue );

	dbc.bindValue(
	WidgetProperties.text(SWT.Modify)
	.observe(this.variablesCodeEditor.getTextControl()),
	this.variablesCodeValue );
	dbc.bindValue(
	WidgetProperties.buttonSelection()
	.observe(this.variablesActionControl),
	this.variablesActionValue );
	}

	@Override
	public void handleValueChange(final ValueChangeEvent<?> event) {
	if (event.getObservable() == this.viewerValue) {
	final ViewerItem oldItem= typed(event, this.viewerValue).diff.getOldValue();
	if (oldItem != null) {
	oldItem.disable();
	}

	final ViewerItem newItem= typed(event, this.viewerValue).diff.getNewValue();
	if (newItem != null) {
	this.viewerDetailLayout.topControl= newItem.enable();
	}
	else {
	this.viewerDetailLayout.topControl= null;
	}
	this.viewerDetailControl.layout();
	}
	}


	@Override
	public void setDefaults(final ILaunchConfigurationWorkingCopy configuration) {
	initDefaults(configuration);
	}

	@Override
	protected void doInitialize(final ILaunchConfiguration configuration) {
	{ final String id= readAttribute(configuration,
	VIEWER_ID_ATTR_NAME,
	"") //$NON-NLS-1$
	.intern();
	final ViewerItem item= getViewerItem(id);
	this.viewerValue.setValue(item);
	}

	{ final String code= readAttribute(configuration,
	VARIABLES_CODE_ATTR_NAME,
	"" ); //$NON-NLS-1$
	this.variablesCodeValue.setValue(code);
	}
	{ final String action= readAttribute(configuration,
	VARIABLES_VIEWER_ACTION_ATTR_NAME,
	""); //$NON-NLS-1$
	this.variablesActionValue.setValue(action.equals(AppControlConfigs.SHOW_ACTION_ID));
	}
	}

	@Override
	protected void doSave(final ILaunchConfigurationWorkingCopy configuration) {
	{ final ViewerItem item= this.viewerValue.getValue();
	configuration.setAttribute(VIEWER_ID_ATTR_NAME, item.getId());
	}

	{ final String code= this.variablesCodeValue.getValue();
	configuration.setAttribute(VARIABLES_CODE_ATTR_NAME, code);
	}
	{ final Boolean enabled= this.variablesActionValue.getValue();
	configuration.setAttribute(VARIABLES_VIEWER_ACTION_ATTR_NAME,
	(enabled) ? AppControlConfigs.SHOW_ACTION_ID : null );
	}
	}

	}