core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/dialogs/MethodSelectionComponent.java - dltk/org.eclipse.dltk.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2017 IBM Corporation and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  *******************************************************************************/
 package org.eclipse.dltk.internal.ui.dialogs;

 import java.io.IOException;
 import java.io.StringReader;
 import java.io.StringWriter;

 import org.eclipse.dltk.core.search.IDLTKSearchScope;
 import org.eclipse.dltk.core.search.MethodNameMatch;
 import org.eclipse.dltk.core.search.SearchEngine;
 import org.eclipse.dltk.internal.corext.util.Strings;
 import org.eclipse.dltk.internal.ui.DLTKUIMessages;
 import org.eclipse.dltk.internal.ui.search.DLTKSearchScopeFactory;
 import org.eclipse.dltk.internal.ui.util.MethodNameMatchLabelProvider;
 import org.eclipse.dltk.internal.ui.util.SWTUtil;
 import org.eclipse.dltk.internal.ui.workingsets.WorkingSetFilterActionGroup;
 import org.eclipse.dltk.ui.DLTKPluginImages;
 import org.eclipse.dltk.ui.DLTKUIPlugin;
 import org.eclipse.dltk.ui.IDLTKUILanguageToolkit;
 import org.eclipse.dltk.ui.dialogs.ITypeSelectionComponent;
 import org.eclipse.dltk.ui.util.PixelConverter;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.jface.action.MenuManager;
 import org.eclipse.jface.dialogs.DialogSettings;
 import org.eclipse.jface.dialogs.IDialogSettings;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.accessibility.AccessibleAdapter;
 import org.eclipse.swt.accessibility.AccessibleEvent;
 import org.eclipse.swt.custom.CLabel;
 import org.eclipse.swt.custom.ViewForm;
 import org.eclipse.swt.events.KeyEvent;
 import org.eclipse.swt.events.KeyListener;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.Rectangle;
 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.Menu;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.swt.widgets.ToolBar;
 import org.eclipse.swt.widgets.ToolItem;
 import org.eclipse.ui.IMemento;
 import org.eclipse.ui.IWorkingSet;
 import org.eclipse.ui.WorkbenchException;
 import org.eclipse.ui.XMLMemento;

 public class MethodSelectionComponent extends Composite implements ITypeSelectionComponent {

 	private IDialogSettings fSettings;
 	private boolean fMultipleSelection;
 	private ITitleLabel fTitleLabel;

 	private ToolBar fToolBar;
 	private ToolItem fToolItem;
 	private MenuManager fMenuManager;
 	private WorkingSetFilterActionGroup fFilterActionGroup;

 	private Text fFilter;
 	private String fInitialFilterText;
 	private IDLTKSearchScope fScope;
 	private MethodInfoViewer fViewer;
 	private ViewForm fForm;
 	private CLabel fLabel;

 	public static final int NONE = 0;
 	public static final int CARET_BEGINNING = 1;
 	public static final int FULL_SELECTION = 2;

 	private static final String DIALOG_SETTINGS = "org.eclipse.jdt.internal.ui.dialogs.TypeSelectionComponent"; //$NON-NLS-1$
 	private static final String SHOW_STATUS_LINE = "show_status_line"; //$NON-NLS-1$
 	private static final String WORKINGS_SET_SETTINGS = "workingset_settings"; //$NON-NLS-1$

 	private IDLTKUILanguageToolkit fToolkit;

 	private class ToggleStatusLineAction extends Action {
 		public ToggleStatusLineAction() {
 			super(DLTKUIMessages.TypeSelectionComponent_show_status_line_label, IAction.AS_CHECK_BOX);
 		}

 		@Override
 		public void run() {
 			if (fForm == null)
 				return;
 			GridData gd = (GridData) fForm.getLayoutData();
 			boolean checked = isChecked();
 			gd.exclude = !checked;
 			fForm.setVisible(checked);
 			fSettings.put(SHOW_STATUS_LINE, checked);
 			MethodSelectionComponent.this.layout();
 		}
 	}

 	/**
 	 * Special interface to access a title lable in
 	 * a generic fashion.
 	 */
 	public interface ITitleLabel {
 		/**
 		 * Sets the title to the given text
 		 *
 		 * @param text the title text
 		 */
 		public void setText(String text);
 	}

 	public MethodSelectionComponent(Composite parent, int style, String message, boolean multi, IDLTKSearchScope scope, int elementKind, String initialFilter, ITitleLabel titleLabel, IDLTKUILanguageToolkit toolkit) {
 		super(parent, style);
 		this.fToolkit = toolkit;
 		setFont(parent.getFont());
 		fMultipleSelection = multi;
 		fScope = scope;
 		fInitialFilterText = initialFilter;
 		fTitleLabel = titleLabel;
 		IDialogSettings settings = DLTKUIPlugin.getDefault().getDialogSettings();
 		fSettings = settings.getSection(DIALOG_SETTINGS);
 		if (fSettings == null) {
 			fSettings = new DialogSettings(DIALOG_SETTINGS);
 			settings.addSection(fSettings);
 		}
 		if (fSettings.get(SHOW_STATUS_LINE) == null) {
 			fSettings.put(SHOW_STATUS_LINE, true);
 		}
 		createContent(message, elementKind);
 	}

 	@Override
 	public void triggerSearch() {
 		fViewer.forceSearch();
 	}

 	public MethodNameMatch[] getSelection() {
 		return fViewer.getSelection();
 	}

 	public IDLTKSearchScope getScope() {
 		return fScope;
 	}

 	private void createContent(final String message, int elementKind) {
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 2;
 		layout.marginWidth = 0;
 		layout.marginHeight = 0;
 		setLayout(layout);
 		Font font = getFont();

 		Control header = createHeader(this, font, message);
 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = 2;
 		header.setLayoutData(gd);

 		fFilter = new Text(this, SWT.BORDER | SWT.FLAT);
 		fFilter.setFont(font);
 		if (fInitialFilterText != null) {
 			fFilter.setText(fInitialFilterText);
 		}
 		gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = 2;
 		fFilter.setLayoutData(gd);
 		fFilter.addModifyListener(e -> patternChanged((Text) e.widget));
 		fFilter.addKeyListener(new KeyListener() {
 			@Override
 			public void keyReleased(KeyEvent e) {
 			}

 			@Override
 			public void keyPressed(KeyEvent e) {
 				if (e.keyCode == SWT.ARROW_DOWN) {
 					fViewer.setFocus();
 				}
 			}
 		});
 		fFilter.getAccessible().addAccessibleListener(new AccessibleAdapter() {
 			@Override
 			public void getName(AccessibleEvent e) {
 				e.result = Strings.removeMnemonicIndicator(message);
 			}
 		});
 		TextFieldNavigationHandler.install(fFilter);

 		Label label = new Label(this, SWT.NONE);
 		label.setFont(font);
 		label.setText(DLTKUIMessages.MethodSelectionComponent_label);
 		label.addTraverseListener(e -> {
 			if (e.detail == SWT.TRAVERSE_MNEMONIC && e.doit) {
 				e.detail = SWT.TRAVERSE_NONE;
 				fViewer.setFocus();
 			}
 		});
 		label = new Label(this, SWT.RIGHT);
 		label.setFont(font);
 		gd = new GridData(GridData.FILL_HORIZONTAL);
 		label.setLayoutData(gd);
 		fViewer = new MethodInfoViewer(this, fMultipleSelection ? SWT.MULTI : SWT.NONE, label, fScope, elementKind, fInitialFilterText, this.fToolkit);
 		gd = new GridData(GridData.FILL_BOTH);
 		final Table table = fViewer.getTable();
 		PixelConverter converter = new PixelConverter(table);
 		gd.widthHint = converter.convertWidthInCharsToPixels(70);
 		gd.heightHint = SWTUtil.getTableHeightHint(table, 10);
 		gd.horizontalSpan = 2;
 		table.setLayoutData(gd);
 		table.getAccessible().addAccessibleListener(new AccessibleAdapter() {
 			@Override
 			public void getName(AccessibleEvent e) {
 				if (table.getSelectionCount() == 0) {
 					e.result = Strings.removeMnemonicIndicator(DLTKUIMessages.MethodSelectionComponent_label);
 				}
 			}
 		});

 		if (!fMultipleSelection) {
 			fForm = new ViewForm(this, SWT.BORDER | SWT.FLAT);
 			fForm.setFont(font);
 			gd = new GridData(GridData.FILL_HORIZONTAL);
 			gd.horizontalSpan = 2;
 			boolean showStatusLine = fSettings.getBoolean(SHOW_STATUS_LINE);
 			gd.exclude = !showStatusLine;
 			fForm.setVisible(showStatusLine);
 			fForm.setLayoutData(gd);
 			fLabel = new CLabel(fForm, SWT.FLAT);
 			fLabel.setFont(fForm.getFont());
 			fForm.setContent(fLabel);
 			table.addSelectionListener(new SelectionAdapter() {
 				private MethodNameMatchLabelProvider fLabelProvider = new MethodNameMatchLabelProvider(MethodNameMatchLabelProvider.SHOW_TYPE_CONTAINER_ONLY + MethodNameMatchLabelProvider.SHOW_ROOT_POSTFIX, fToolkit);

 				@Override
 				public void widgetSelected(SelectionEvent event) {
 					MethodNameMatch[] selection = fViewer.getSelection();
 					if (selection.length != 1) {
 						fLabel.setText(""); //$NON-NLS-1$
 						fLabel.setImage(null);
 					} else {
 						MethodNameMatch type = selection[0];
 						fLabel.setText(fViewer.getLabelProvider().getQualificationText(type));
 						fLabel.setImage(fLabelProvider.getImage(type));
 					}
 				}
 			});
 		}
 		addDisposeListener(event -> disposeComponent());
 	}

 	public void addSelectionListener(SelectionListener listener) {
 		fViewer.getTable().addSelectionListener(listener);
 	}

 	public void populate(int selectionMode) {
 		if (fInitialFilterText != null) {
 			switch (selectionMode) {
 				case CARET_BEGINNING:
 					fFilter.setSelection(0, 0);
 					break;
 				case FULL_SELECTION:
 					fFilter.setSelection(0, fInitialFilterText.length());
 					break;
 			}
 		}
 		fFilter.setFocus();
 		fViewer.startup();
 	}

 	private void patternChanged(Text text) {
 		fViewer.setSearchPattern(text.getText());
 	}

 	private Control createHeader(Composite parent, Font font, String message) {
 		Composite header = new Composite(parent, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 2;
 		layout.marginWidth = 0;
 		layout.marginHeight = 0;
 		header.setLayout(layout);
 		header.setFont(font);
 		Label label = new Label(header, SWT.NONE);
 		label.setText(message);
 		label.setFont(font);
 		label.addTraverseListener(e -> {
 			if (e.detail == SWT.TRAVERSE_MNEMONIC && e.doit) {
 				e.detail = SWT.TRAVERSE_NONE;
 				fFilter.setFocus();
 			}
 		});
 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		label.setLayoutData(gd);

 		createViewMenu(header);
 		return header;
 	}

 	private void createViewMenu(Composite parent) {
 		fToolBar = new ToolBar(parent, SWT.FLAT);
 		fToolItem = new ToolItem(fToolBar, SWT.PUSH, 0);

 		GridData data = new GridData();
 		data.horizontalAlignment = GridData.END;
 		fToolBar.setLayoutData(data);

 		fToolItem.setImage(DLTKUIPlugin.getImageDescriptorRegistry().get(
 				DLTKPluginImages.DESC_ELCL_VIEW_MENU));
 		fToolItem.setDisabledImage(DLTKUIPlugin.getImageDescriptorRegistry()
 				.get(DLTKPluginImages.DESC_DLCL_VIEW_MENU));
 		fToolItem.setToolTipText(DLTKUIMessages.TypeSelectionComponent_menu);
 		fToolItem.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				showViewMenu();
 			}
 		});

 		fMenuManager = new MenuManager();
 		fillViewMenu(fMenuManager);

 		// ICommandService commandService= (ICommandService)PlatformUI.getWorkbench().getAdapter(ICommandService.class);
 		// IHandlerService handlerService= (IHandlerService)PlatformUI.getWorkbench().getAdapter(IHandlerService.class);
 	}

 	private void showViewMenu() {
 		Menu menu = fMenuManager.createContextMenu(getShell());
 		Rectangle bounds = fToolItem.getBounds();
 		Point topLeft = new Point(bounds.x, bounds.y + bounds.height);
 		topLeft = fToolBar.toDisplay(topLeft);
 		menu.setLocation(topLeft.x, topLeft.y);
 		menu.setVisible(true);
 	}

 	private void fillViewMenu(IMenuManager viewMenu) {
 		if (!fMultipleSelection) {
 			ToggleStatusLineAction showStatusLineAction = new ToggleStatusLineAction();
 			showStatusLineAction.setChecked(fSettings.getBoolean(SHOW_STATUS_LINE));
 			viewMenu.add(showStatusLineAction);
 		}
 		if (fScope == null) {
 			fFilterActionGroup = new WorkingSetFilterActionGroup(getShell(),
 					DLTKUIPlugin.getActivePage(), event -> {
 						IWorkingSet ws = (IWorkingSet) event.getNewValue();
 						if (ws == null || (ws.isAggregateWorkingSet()
 								&& ws.isEmpty())) {
 							fScope = SearchEngine.createWorkspaceScope(
 									fToolkit.getCoreToolkit());
 							fTitleLabel.setText(null);
 						} else {
 							fScope = DLTKSearchScopeFactory.getInstance()
 									.createSearchScope(ws, true,
 											fToolkit.getCoreToolkit());
 							fTitleLabel.setText(ws.getLabel());
 				}
 						fViewer.setSearchScope(fScope, true);
 			});
 			String setting = fSettings.get(WORKINGS_SET_SETTINGS);
 			if (setting != null) {
 				try {
 					IMemento memento = XMLMemento.createReadRoot(new StringReader(setting));
 					fFilterActionGroup.restoreState(memento);
 				} catch (WorkbenchException e) {
 				}
 			}
 			IWorkingSet ws = fFilterActionGroup.getWorkingSet();
 			if (ws == null || (ws.isAggregateWorkingSet() && ws.isEmpty())) {
 				fScope = SearchEngine.createWorkspaceScope(fToolkit.getCoreToolkit());
 				fTitleLabel.setText(null);
 			} else {
 				fScope = DLTKSearchScopeFactory.getInstance().createSearchScope(ws, true, fToolkit.getCoreToolkit());
 				fTitleLabel.setText(ws.getLabel());
 			}
 			fFilterActionGroup.fillViewMenu(viewMenu);
 		}
 	}

 	private void disposeComponent() {
 		if (fFilterActionGroup != null) {
 			XMLMemento memento = XMLMemento.createWriteRoot("workingSet"); //$NON-NLS-1$
 			fFilterActionGroup.saveState(memento);
 			fFilterActionGroup.dispose();
 			StringWriter writer = new StringWriter();
 			try {
 				memento.save(writer);
 				fSettings.put(WORKINGS_SET_SETTINGS, writer.getBuffer().toString());
 			} catch (IOException e) {
 				// don't do anything. Simply don't store the settings
 			}
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2017 IBM Corporation and others.
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Public License v. 2.0 which is available at
	* http://www.eclipse.org/legal/epl-2.0.
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	*******************************************************************************/
	package org.eclipse.dltk.internal.ui.dialogs;

	import java.io.IOException;
	import java.io.StringReader;
	import java.io.StringWriter;

	import org.eclipse.dltk.core.search.IDLTKSearchScope;
	import org.eclipse.dltk.core.search.MethodNameMatch;
	import org.eclipse.dltk.core.search.SearchEngine;
	import org.eclipse.dltk.internal.corext.util.Strings;
	import org.eclipse.dltk.internal.ui.DLTKUIMessages;
	import org.eclipse.dltk.internal.ui.search.DLTKSearchScopeFactory;
	import org.eclipse.dltk.internal.ui.util.MethodNameMatchLabelProvider;
	import org.eclipse.dltk.internal.ui.util.SWTUtil;
	import org.eclipse.dltk.internal.ui.workingsets.WorkingSetFilterActionGroup;
	import org.eclipse.dltk.ui.DLTKPluginImages;
	import org.eclipse.dltk.ui.DLTKUIPlugin;
	import org.eclipse.dltk.ui.IDLTKUILanguageToolkit;
	import org.eclipse.dltk.ui.dialogs.ITypeSelectionComponent;
	import org.eclipse.dltk.ui.util.PixelConverter;
	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.action.IAction;
	import org.eclipse.jface.action.IMenuManager;
	import org.eclipse.jface.action.MenuManager;
	import org.eclipse.jface.dialogs.DialogSettings;
	import org.eclipse.jface.dialogs.IDialogSettings;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.accessibility.AccessibleAdapter;
	import org.eclipse.swt.accessibility.AccessibleEvent;
	import org.eclipse.swt.custom.CLabel;
	import org.eclipse.swt.custom.ViewForm;
	import org.eclipse.swt.events.KeyEvent;
	import org.eclipse.swt.events.KeyListener;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.graphics.Font;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.graphics.Rectangle;
	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.Menu;
	import org.eclipse.swt.widgets.Table;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.swt.widgets.ToolBar;
	import org.eclipse.swt.widgets.ToolItem;
	import org.eclipse.ui.IMemento;
	import org.eclipse.ui.IWorkingSet;
	import org.eclipse.ui.WorkbenchException;
	import org.eclipse.ui.XMLMemento;

	public class MethodSelectionComponent extends Composite implements ITypeSelectionComponent {

	private IDialogSettings fSettings;
	private boolean fMultipleSelection;
	private ITitleLabel fTitleLabel;

	private ToolBar fToolBar;
	private ToolItem fToolItem;
	private MenuManager fMenuManager;
	private WorkingSetFilterActionGroup fFilterActionGroup;

	private Text fFilter;
	private String fInitialFilterText;
	private IDLTKSearchScope fScope;
	private MethodInfoViewer fViewer;
	private ViewForm fForm;
	private CLabel fLabel;

	public static final int NONE = 0;
	public static final int CARET_BEGINNING = 1;
	public static final int FULL_SELECTION = 2;

	private static final String DIALOG_SETTINGS = "org.eclipse.jdt.internal.ui.dialogs.TypeSelectionComponent"; //$NON-NLS-1$
	private static final String SHOW_STATUS_LINE = "show_status_line"; //$NON-NLS-1$
	private static final String WORKINGS_SET_SETTINGS = "workingset_settings"; //$NON-NLS-1$

	private IDLTKUILanguageToolkit fToolkit;

	private class ToggleStatusLineAction extends Action {
	public ToggleStatusLineAction() {
	super(DLTKUIMessages.TypeSelectionComponent_show_status_line_label, IAction.AS_CHECK_BOX);
	}

	@Override
	public void run() {
	if (fForm == null)
	return;
	GridData gd = (GridData) fForm.getLayoutData();
	boolean checked = isChecked();
	gd.exclude = !checked;
	fForm.setVisible(checked);
	fSettings.put(SHOW_STATUS_LINE, checked);
	MethodSelectionComponent.this.layout();
	}
	}

	/**
	* Special interface to access a title lable in
	* a generic fashion.
	*/
	public interface ITitleLabel {
	/**
	* Sets the title to the given text
	*
	* @param text the title text
	*/
	public void setText(String text);
	}

	public MethodSelectionComponent(Composite parent, int style, String message, boolean multi, IDLTKSearchScope scope, int elementKind, String initialFilter, ITitleLabel titleLabel, IDLTKUILanguageToolkit toolkit) {
	super(parent, style);
	this.fToolkit = toolkit;
	setFont(parent.getFont());
	fMultipleSelection = multi;
	fScope = scope;
	fInitialFilterText = initialFilter;
	fTitleLabel = titleLabel;
	IDialogSettings settings = DLTKUIPlugin.getDefault().getDialogSettings();
	fSettings = settings.getSection(DIALOG_SETTINGS);
	if (fSettings == null) {
	fSettings = new DialogSettings(DIALOG_SETTINGS);
	settings.addSection(fSettings);
	}
	if (fSettings.get(SHOW_STATUS_LINE) == null) {
	fSettings.put(SHOW_STATUS_LINE, true);
	}
	createContent(message, elementKind);
	}

	@Override
	public void triggerSearch() {
	fViewer.forceSearch();
	}

	public MethodNameMatch[] getSelection() {
	return fViewer.getSelection();
	}

	public IDLTKSearchScope getScope() {
	return fScope;
	}

	private void createContent(final String message, int elementKind) {
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	setLayout(layout);
	Font font = getFont();

	Control header = createHeader(this, font, message);
	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 2;
	header.setLayoutData(gd);

	fFilter = new Text(this, SWT.BORDER \| SWT.FLAT);
	fFilter.setFont(font);
	if (fInitialFilterText != null) {
	fFilter.setText(fInitialFilterText);
	}
	gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 2;
	fFilter.setLayoutData(gd);
	fFilter.addModifyListener(e -> patternChanged((Text) e.widget));
	fFilter.addKeyListener(new KeyListener() {
	@Override
	public void keyReleased(KeyEvent e) {
	}

	@Override
	public void keyPressed(KeyEvent e) {
	if (e.keyCode == SWT.ARROW_DOWN) {
	fViewer.setFocus();
	}
	}
	});
	fFilter.getAccessible().addAccessibleListener(new AccessibleAdapter() {
	@Override
	public void getName(AccessibleEvent e) {
	e.result = Strings.removeMnemonicIndicator(message);
	}
	});
	TextFieldNavigationHandler.install(fFilter);

	Label label = new Label(this, SWT.NONE);
	label.setFont(font);
	label.setText(DLTKUIMessages.MethodSelectionComponent_label);
	label.addTraverseListener(e -> {
	if (e.detail == SWT.TRAVERSE_MNEMONIC && e.doit) {
	e.detail = SWT.TRAVERSE_NONE;
	fViewer.setFocus();
	}
	});
	label = new Label(this, SWT.RIGHT);
	label.setFont(font);
	gd = new GridData(GridData.FILL_HORIZONTAL);
	label.setLayoutData(gd);
	fViewer = new MethodInfoViewer(this, fMultipleSelection ? SWT.MULTI : SWT.NONE, label, fScope, elementKind, fInitialFilterText, this.fToolkit);
	gd = new GridData(GridData.FILL_BOTH);
	final Table table = fViewer.getTable();
	PixelConverter converter = new PixelConverter(table);
	gd.widthHint = converter.convertWidthInCharsToPixels(70);
	gd.heightHint = SWTUtil.getTableHeightHint(table, 10);
	gd.horizontalSpan = 2;
	table.setLayoutData(gd);
	table.getAccessible().addAccessibleListener(new AccessibleAdapter() {
	@Override
	public void getName(AccessibleEvent e) {
	if (table.getSelectionCount() == 0) {
	e.result = Strings.removeMnemonicIndicator(DLTKUIMessages.MethodSelectionComponent_label);
	}
	}
	});

	if (!fMultipleSelection) {
	fForm = new ViewForm(this, SWT.BORDER \| SWT.FLAT);
	fForm.setFont(font);
	gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 2;
	boolean showStatusLine = fSettings.getBoolean(SHOW_STATUS_LINE);
	gd.exclude = !showStatusLine;
	fForm.setVisible(showStatusLine);
	fForm.setLayoutData(gd);
	fLabel = new CLabel(fForm, SWT.FLAT);
	fLabel.setFont(fForm.getFont());
	fForm.setContent(fLabel);
	table.addSelectionListener(new SelectionAdapter() {
	private MethodNameMatchLabelProvider fLabelProvider = new MethodNameMatchLabelProvider(MethodNameMatchLabelProvider.SHOW_TYPE_CONTAINER_ONLY + MethodNameMatchLabelProvider.SHOW_ROOT_POSTFIX, fToolkit);

	@Override
	public void widgetSelected(SelectionEvent event) {
	MethodNameMatch[] selection = fViewer.getSelection();
	if (selection.length != 1) {
	fLabel.setText(""); //$NON-NLS-1$
	fLabel.setImage(null);
	} else {
	MethodNameMatch type = selection[0];
	fLabel.setText(fViewer.getLabelProvider().getQualificationText(type));
	fLabel.setImage(fLabelProvider.getImage(type));
	}
	}
	});
	}
	addDisposeListener(event -> disposeComponent());
	}

	public void addSelectionListener(SelectionListener listener) {
	fViewer.getTable().addSelectionListener(listener);
	}

	public void populate(int selectionMode) {
	if (fInitialFilterText != null) {
	switch (selectionMode) {
	case CARET_BEGINNING:
	fFilter.setSelection(0, 0);
	break;
	case FULL_SELECTION:
	fFilter.setSelection(0, fInitialFilterText.length());
	break;
	}
	}
	fFilter.setFocus();
	fViewer.startup();
	}

	private void patternChanged(Text text) {
	fViewer.setSearchPattern(text.getText());
	}

	private Control createHeader(Composite parent, Font font, String message) {
	Composite header = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	header.setLayout(layout);
	header.setFont(font);
	Label label = new Label(header, SWT.NONE);
	label.setText(message);
	label.setFont(font);
	label.addTraverseListener(e -> {
	if (e.detail == SWT.TRAVERSE_MNEMONIC && e.doit) {
	e.detail = SWT.TRAVERSE_NONE;
	fFilter.setFocus();
	}
	});
	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	label.setLayoutData(gd);

	createViewMenu(header);
	return header;
	}

	private void createViewMenu(Composite parent) {
	fToolBar = new ToolBar(parent, SWT.FLAT);
	fToolItem = new ToolItem(fToolBar, SWT.PUSH, 0);

	GridData data = new GridData();
	data.horizontalAlignment = GridData.END;
	fToolBar.setLayoutData(data);

	fToolItem.setImage(DLTKUIPlugin.getImageDescriptorRegistry().get(
	DLTKPluginImages.DESC_ELCL_VIEW_MENU));
	fToolItem.setDisabledImage(DLTKUIPlugin.getImageDescriptorRegistry()
	.get(DLTKPluginImages.DESC_DLCL_VIEW_MENU));
	fToolItem.setToolTipText(DLTKUIMessages.TypeSelectionComponent_menu);
	fToolItem.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	showViewMenu();
	}
	});

	fMenuManager = new MenuManager();
	fillViewMenu(fMenuManager);

	// ICommandService commandService= (ICommandService)PlatformUI.getWorkbench().getAdapter(ICommandService.class);
	// IHandlerService handlerService= (IHandlerService)PlatformUI.getWorkbench().getAdapter(IHandlerService.class);
	}

	private void showViewMenu() {
	Menu menu = fMenuManager.createContextMenu(getShell());
	Rectangle bounds = fToolItem.getBounds();
	Point topLeft = new Point(bounds.x, bounds.y + bounds.height);
	topLeft = fToolBar.toDisplay(topLeft);
	menu.setLocation(topLeft.x, topLeft.y);
	menu.setVisible(true);
	}

	private void fillViewMenu(IMenuManager viewMenu) {
	if (!fMultipleSelection) {
	ToggleStatusLineAction showStatusLineAction = new ToggleStatusLineAction();
	showStatusLineAction.setChecked(fSettings.getBoolean(SHOW_STATUS_LINE));
	viewMenu.add(showStatusLineAction);
	}
	if (fScope == null) {
	fFilterActionGroup = new WorkingSetFilterActionGroup(getShell(),
	DLTKUIPlugin.getActivePage(), event -> {
	IWorkingSet ws = (IWorkingSet) event.getNewValue();
	if (ws == null \|\| (ws.isAggregateWorkingSet()
	&& ws.isEmpty())) {
	fScope = SearchEngine.createWorkspaceScope(
	fToolkit.getCoreToolkit());
	fTitleLabel.setText(null);
	} else {
	fScope = DLTKSearchScopeFactory.getInstance()
	.createSearchScope(ws, true,
	fToolkit.getCoreToolkit());
	fTitleLabel.setText(ws.getLabel());
	}
	fViewer.setSearchScope(fScope, true);
	});
	String setting = fSettings.get(WORKINGS_SET_SETTINGS);
	if (setting != null) {
	try {
	IMemento memento = XMLMemento.createReadRoot(new StringReader(setting));
	fFilterActionGroup.restoreState(memento);
	} catch (WorkbenchException e) {
	}
	}
	IWorkingSet ws = fFilterActionGroup.getWorkingSet();
	if (ws == null \|\| (ws.isAggregateWorkingSet() && ws.isEmpty())) {
	fScope = SearchEngine.createWorkspaceScope(fToolkit.getCoreToolkit());
	fTitleLabel.setText(null);
	} else {
	fScope = DLTKSearchScopeFactory.getInstance().createSearchScope(ws, true, fToolkit.getCoreToolkit());
	fTitleLabel.setText(ws.getLabel());
	}
	fFilterActionGroup.fillViewMenu(viewMenu);
	}
	}

	private void disposeComponent() {
	if (fFilterActionGroup != null) {
	XMLMemento memento = XMLMemento.createWriteRoot("workingSet"); //$NON-NLS-1$
	fFilterActionGroup.saveState(memento);
	fFilterActionGroup.dispose();
	StringWriter writer = new StringWriter();
	try {
	memento.save(writer);
	fSettings.put(WORKINGS_SET_SETTINGS, writer.getBuffer().toString());
	} catch (IOException e) {
	// don't do anything. Simply don't store the settings
	}
	}
	}
	}