org.eclipse.mylyn.commons.workbench/src/org/eclipse/mylyn/commons/workbench/search/TextSearchControl.java - mylyn/org.eclipse.mylyn.commons - Git at Google

 /*******************************************************************************
  * Copyright (c) 2010, 2011 Tasktop Technologies and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     Tasktop Technologies - initial API and implementation
  *******************************************************************************/

 package org.eclipse.mylyn.commons.workbench.search;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;

 import org.eclipse.jface.layout.GridLayoutFactory;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.mylyn.internal.commons.workbench.CommonsWorkbenchPlugin;
 import org.eclipse.mylyn.internal.commons.workbench.Messages;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.accessibility.ACC;
 import org.eclipse.swt.accessibility.AccessibleAdapter;
 import org.eclipse.swt.accessibility.AccessibleControlAdapter;
 import org.eclipse.swt.accessibility.AccessibleControlEvent;
 import org.eclipse.swt.accessibility.AccessibleEvent;
 import org.eclipse.swt.events.DisposeEvent;
 import org.eclipse.swt.events.DisposeListener;
 import org.eclipse.swt.events.FocusAdapter;
 import org.eclipse.swt.events.FocusEvent;
 import org.eclipse.swt.events.ModifyEvent;
 import org.eclipse.swt.events.ModifyListener;
 import org.eclipse.swt.events.MouseAdapter;
 import org.eclipse.swt.events.MouseEvent;
 import org.eclipse.swt.events.MouseMoveListener;
 import org.eclipse.swt.events.MouseTrackListener;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.events.TraverseListener;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Event;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.IMemento;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.internal.WorkbenchMessages;
 import org.eclipse.ui.plugin.AbstractUIPlugin;

 /**
  * @author Shawn Minto
  * @since 3.7
  */
 public class TextSearchControl extends Composite {

 	private static final String FIND_TEXT_MEMENTO_ELEMENT = "text"; //$NON-NLS-1$

 	private static final String FIND_MEMENTO_ELEMENT = "historyItem"; //$NON-NLS-1$

 	private static final String FIND_MEMENTO_TYPE = "filteredTreeFindHistory"; //$NON-NLS-1$

 	private static final int MAX_HISTORY_ITEMS = 50;

 	/**
 	 * Image descriptor for enabled clear button.
 	 */
 	private static final String CLEAR_ICON = "org.eclipse.ui.internal.dialogs.CLEAR_ICON"; //$NON-NLS-1$

 	/**
 	 * Image descriptor for enabled clear button.
 	 */
 	private static final String FIND_ICON = "org.eclipse.ui.internal.dialogs.FIND_ICON"; //$NON-NLS-1$

 	/* SWT STYLE BIT AVAILABLE ON 3.5 AND HIGHER */
 	public static final int ICON_SEARCH = 1 << 9;

 	/* SWT STYLE BIT AVAILABLE ON 3.5 AND HIGHER */
 	public static final int ICON_CANCEL = 1 << 8;

 	/**
 	 * Get image descriptors for the clear button.
 	 */
 	static {
 		ImageDescriptor descriptor = AbstractUIPlugin.imageDescriptorFromPlugin(PlatformUI.PLUGIN_ID,
 				"$nl$/icons/full/etool16/clear_co.gif"); //$NON-NLS-1$
 		if (descriptor != null) {
 			JFaceResources.getImageRegistry().put(CLEAR_ICON, descriptor);
 		}

 		descriptor = AbstractUIPlugin.imageDescriptorFromPlugin(CommonsWorkbenchPlugin.ID_PLUGIN,
 				"$nl$/icons/etool16/find.png"); //$NON-NLS-1$
 		if (descriptor != null) {
 			JFaceResources.getImageRegistry().put(FIND_ICON, descriptor);
 		}
 	}

 	private final Text textControl;

 	private Control clearControl;

 	private Control findControl;

 	private final boolean automaticFind;

 	private final Set<SelectionListener> selectionListeners = new HashSet<SelectionListener>();

 	private Collection<String> searchHistory = new LinkedHashSet<String>();

 	private boolean hasHistorySupport;

 	private static Boolean useNativeSearchField;

 	@SuppressWarnings("restriction")
 	public TextSearchControl(Composite parent, boolean automaticFind, SearchHistoryPopupDialog historyDialog) {
 		super(parent, getCompositeStyle(automaticFind, parent));
 		this.automaticFind = automaticFind;

 		int textStyle = SWT.SINGLE;
 		int numColumns = 1;
 		if (useNativeSearchField(automaticFind, parent)) {
 			if (automaticFind) {
 				textStyle |= SWT.SEARCH | ICON_CANCEL;
 			} else {
 				textStyle |= SWT.SEARCH | ICON_SEARCH | ICON_CANCEL;
 			}
 		} else {
 			super.setBackground(getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
 			super.setFont(parent.getFont());
 			numColumns = 2;
 			if (!automaticFind) {
 				numColumns += 1;
 			}
 		}
 		GridLayoutFactory.swtDefaults()
 				.margins(0, 0)
 				.extendedMargins(0, 0, 0, 0)
 				.spacing(0, 1)
 				.numColumns(numColumns)
 				.applyTo(this);

 		textControl = new Text(this, textStyle);

 		GridData gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
 		textControl.setLayoutData(gridData);

 		if (useNativeSearchField == null || !useNativeSearchField) {
 			findControl = createLabelButtonControl(this, textControl,
 					JFaceResources.getImageRegistry().getDescriptor(FIND_ICON),
 					Messages.TextControl_AccessibleListenerFindButton, Messages.TextControl_FindToolTip, ICON_SEARCH);
 			clearControl = createLabelButtonControl(this, textControl,
 					JFaceResources.getImageRegistry().getDescriptor(CLEAR_ICON),
 					WorkbenchMessages.FilteredTree_ClearToolTip,//FilteredTree_AccessibleListenerClearButton,
 					WorkbenchMessages.FilteredTree_ClearToolTip, ICON_CANCEL);
 			addModifyListener(new ModifyListener() {

 				public void modifyText(ModifyEvent e) {
 					updateButtonVisibilityAndEnablement();

 				}
 			});
 			updateButtonVisibilityAndEnablement();
 		}

 		if (historyDialog != null) {
 			historyDialog.attach(this);
 			hasHistorySupport = true;
 		}

 		registerListeners();
 	}

 	public boolean hasHistorySupport() {
 		return hasHistorySupport;
 	}

 	private void registerListeners() {
 		addSelectionListener(new SelectionAdapter() {

 			@Override
 			public void widgetDefaultSelected(SelectionEvent e) {
 				if (textControl != null && !textControl.isDisposed()) {
 					addToSearchHistory(textControl.getText());
 				}

 			}
 		});
 		textControl.addFocusListener(new FocusAdapter() {

 			@Override
 			public void focusLost(FocusEvent e) {
 				if (textControl != null && !textControl.isDisposed()) {
 					addToSearchHistory(textControl.getText());
 				}
 			}
 		});
 	}

 	private static int getCompositeStyle(boolean automaticFind, Composite parent) {
 		if (useNativeSearchField(automaticFind, parent)) {
 			return SWT.NONE;
 		}
 		return SWT.BORDER;
 	}

 	private static boolean useNativeSearchField(boolean automaticFind, Composite parent) {
 		if (parent != null) {
 			if (useNativeSearchField == null) {
 				useNativeSearchField = Boolean.FALSE;
 				Text testText = null;
 				try {
 					int style = SWT.SEARCH | ICON_CANCEL;
 					if (automaticFind) {
 						style |= ICON_SEARCH;
 					}
 					testText = new Text(parent, style);
 					useNativeSearchField = Boolean.valueOf((testText.getStyle() & ICON_CANCEL) != 0
 							&& (!automaticFind || (testText.getStyle() & ICON_SEARCH) != 0));
 				} finally {
 					if (testText != null) {
 						testText.dispose();
 					}
 				}

 			}
 		} else {
 			useNativeSearchField = Boolean.FALSE;
 		}
 		return useNativeSearchField.booleanValue();
 	}

 	private Control createLabelButtonControl(Composite parent, final Text textControl,
 			ImageDescriptor activeImageDescriptor, final String accessibilityText, String toolTipText, final int detail) {

 		final Image nativeImage = parent.getDisplay().getSystemImage(detail);

 		final Image activeImage = nativeImage != null ? nativeImage : activeImageDescriptor.createImage();
 		final Image inactiveImage = new Image(parent.getDisplay(), activeImage, SWT.IMAGE_GRAY);
 		final Image pressedImage = inactiveImage;

 		final Label labelButton = new Label(parent, SWT.NONE);
 		labelButton.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false));
 		labelButton.setImage(inactiveImage);
 		labelButton.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
 		labelButton.setToolTipText(toolTipText);
 		labelButton.addDisposeListener(new DisposeListener() {
 			public void widgetDisposed(DisposeEvent e) {
 				if (nativeImage == null && activeImage != null && !activeImage.isDisposed()) {
 					activeImage.dispose();
 				}
 				if (inactiveImage != null && !inactiveImage.isDisposed()) {
 					inactiveImage.dispose();
 				}
 				if (pressedImage != null && !pressedImage.isDisposed()) {
 					pressedImage.dispose();
 				}
 			}
 		});
 		labelButton.addMouseListener(new MouseAdapter() {
 			private MouseMoveListener fMoveListener;

 			@Override
 			public void mouseDown(MouseEvent e) {
 				labelButton.setImage(pressedImage);
 				fMoveListener = new MouseMoveListener() {
 					private boolean fMouseInButton = true;

 					public void mouseMove(MouseEvent e) {
 						boolean mouseInButton = isMouseInButton(e);
 						if (mouseInButton != fMouseInButton) {
 							fMouseInButton = mouseInButton;
 							labelButton.setImage(mouseInButton ? pressedImage : inactiveImage);
 						}
 					}
 				};
 				labelButton.addMouseMoveListener(fMoveListener);
 			}

 			@Override
 			public void mouseUp(MouseEvent e) {
 				if (fMoveListener != null) {
 					labelButton.removeMouseMoveListener(fMoveListener);
 					fMoveListener = null;
 					boolean mouseInButton = isMouseInButton(e);
 					labelButton.setImage(mouseInButton ? activeImage : inactiveImage);
 					if (mouseInButton) {
 						if (textControl.isEnabled() && textControl.getText().length() > 0) {
 							notifySelectionChanged(detail);
 						}
 					}
 				}
 			}

 			private boolean isMouseInButton(MouseEvent e) {
 				Point buttonSize = labelButton.getSize();
 				return 0 <= e.x && e.x < buttonSize.x && 0 <= e.y && e.y < buttonSize.y;
 			}
 		});

 		labelButton.addMouseTrackListener(new MouseTrackListener() {
 			public void mouseEnter(MouseEvent e) {
 				if (labelButton.getImage() != activeImage) {
 					labelButton.setImage(activeImage);
 				}
 			}

 			public void mouseExit(MouseEvent e) {
 				if (labelButton.getImage() != inactiveImage) {
 					labelButton.setImage(inactiveImage);
 				}
 			}

 			public void mouseHover(MouseEvent e) {
 			}
 		});

 		labelButton.getAccessible().addAccessibleListener(new AccessibleAdapter() {
 			@Override
 			public void getName(AccessibleEvent e) {
 				e.result = accessibilityText;
 			}
 		});
 		labelButton.getAccessible().addAccessibleControlListener(new AccessibleControlAdapter() {
 			@Override
 			public void getRole(AccessibleControlEvent e) {
 				e.detail = ACC.ROLE_PUSHBUTTON;
 			}
 		});
 		return labelButton;
 	}

 	@Override
 	public void addTraverseListener(TraverseListener listener) {
 		textControl.addTraverseListener(listener);
 	}

 	@Override
 	public void removeTraverseListener(TraverseListener listener) {
 		textControl.removeTraverseListener(listener);
 	}

 	public void addSelectionListener(SelectionListener listener) {
 		textControl.addSelectionListener(listener);
 		selectionListeners.add(listener);
 	}

 	public void removeSelectionListener(SelectionListener listener) {
 		textControl.removeSelectionListener(listener);
 		selectionListeners.remove(listener);
 	}

 	public void addModifyListener(ModifyListener listener) {
 		textControl.addModifyListener(listener);
 	}

 	public void removeModifyListener(ModifyListener listener) {
 		textControl.removeModifyListener(listener);
 	}

 	private void notifySelectionChanged(int detail) {
 		if (useNativeSearchField != null && useNativeSearchField) {
 			// notification should happen via the widgets selection listener
 			return;
 		}
 		Event event = new Event();
 		event.detail = detail;
 		event.widget = textControl;
 		event.display = textControl.getDisplay();

 		SelectionEvent e = new SelectionEvent(event);
 		for (Object element : selectionListeners) {
 			((SelectionListener) element).widgetDefaultSelected(e);
 		}
 	}

 	private void updateButtonVisibilityAndEnablement() {
 		if (textControl != null && !textControl.isDisposed()) {
 			boolean hasText = textControl.getText().length() > 0;

 			setFindButtonVisibility(!(hasText && automaticFind));
 			setClearButtonVisibility(hasText);
 		}
 	}

 	private void setFindButtonVisibility(boolean visible) {
 		if (findControl != null && !findControl.isDisposed()) {
 			findControl.setVisible(visible);
 			if (findControl.getLayoutData() instanceof GridData) {
 				((GridData) findControl.getLayoutData()).exclude = !visible;
 				findControl.getParent().layout();
 			}
 		}
 	}

 	private void setClearButtonVisibility(boolean visible) {
 		if (clearControl != null && !clearControl.isDisposed()) {
 			clearControl.setVisible(visible);
 			if (clearControl.getLayoutData() instanceof GridData) {
 				((GridData) clearControl.getLayoutData()).exclude = !visible;
 				clearControl.getParent().layout();
 			}
 		}
 	}

 	public Text getTextControl() {
 		return textControl;
 	}

 	public String getText() {
 		if (textControl != null && !textControl.isDisposed()) {
 			return textControl.getText();
 		}
 		return ""; //$NON-NLS-1$
 	}

 	public void setText(String text) {
 		if (textControl != null && !textControl.isDisposed()) {
 			textControl.setText(text);
 		}
 	}

 	@Override
 	public void setBackground(Color color) {
 		if (useNativeSearchField != null && useNativeSearchField) {
 			super.setBackground(color);
 		}
 	}

 	public Collection<String> getSearchHistory() {
 		return Collections.unmodifiableCollection(searchHistory);
 	}

 	void addToSearchHistory(String searchString) {
 		if (searchString != null && searchString.trim().length() > 0) {
 			searchHistory.remove(searchString);
 			searchHistory.add(searchString);
 		}
 	}

 	public void saveState(IMemento memento) {
 		if (memento == null) {
 			return;
 		}

 		IMemento rootMemento = memento.createChild(FIND_MEMENTO_TYPE);
 		int i = 0;
 		for (String text : searchHistory) {
 			IMemento child = rootMemento.createChild(FIND_MEMENTO_ELEMENT);
 			child.putString(FIND_TEXT_MEMENTO_ELEMENT, text);
 			i++;
 			if (i > MAX_HISTORY_ITEMS) {
 				break;
 			}
 		}
 	}

 	public void restoreState(IMemento memento) {
 		if (memento == null) {
 			return;
 		}
 		List<String> history = new ArrayList<String>();

 		IMemento rootMemento = memento.getChild(FIND_MEMENTO_TYPE);
 		if (rootMemento != null) {
 			IMemento[] children = rootMemento.getChildren(FIND_MEMENTO_ELEMENT);
 			if (children != null && children.length > 0) {
 				for (IMemento child : children) {
 					String historyItem = child.getString(FIND_TEXT_MEMENTO_ELEMENT);
 					// add to the end of the list
 					history.add(history.size(), historyItem);
 				}
 			}
 		}
 		if (history != null) {
 			searchHistory = history;
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2010, 2011 Tasktop Technologies and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* Tasktop Technologies - initial API and implementation
	*******************************************************************************/

	package org.eclipse.mylyn.commons.workbench.search;

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.HashSet;
	import java.util.LinkedHashSet;
	import java.util.List;
	import java.util.Set;

	import org.eclipse.jface.layout.GridLayoutFactory;
	import org.eclipse.jface.resource.ImageDescriptor;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.mylyn.internal.commons.workbench.CommonsWorkbenchPlugin;
	import org.eclipse.mylyn.internal.commons.workbench.Messages;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.accessibility.ACC;
	import org.eclipse.swt.accessibility.AccessibleAdapter;
	import org.eclipse.swt.accessibility.AccessibleControlAdapter;
	import org.eclipse.swt.accessibility.AccessibleControlEvent;
	import org.eclipse.swt.accessibility.AccessibleEvent;
	import org.eclipse.swt.events.DisposeEvent;
	import org.eclipse.swt.events.DisposeListener;
	import org.eclipse.swt.events.FocusAdapter;
	import org.eclipse.swt.events.FocusEvent;
	import org.eclipse.swt.events.ModifyEvent;
	import org.eclipse.swt.events.ModifyListener;
	import org.eclipse.swt.events.MouseAdapter;
	import org.eclipse.swt.events.MouseEvent;
	import org.eclipse.swt.events.MouseMoveListener;
	import org.eclipse.swt.events.MouseTrackListener;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.events.TraverseListener;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Event;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.ui.IMemento;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.internal.WorkbenchMessages;
	import org.eclipse.ui.plugin.AbstractUIPlugin;

	/**
	* @author Shawn Minto
	* @since 3.7
	*/
	public class TextSearchControl extends Composite {

	private static final String FIND_TEXT_MEMENTO_ELEMENT = "text"; //$NON-NLS-1$

	private static final String FIND_MEMENTO_ELEMENT = "historyItem"; //$NON-NLS-1$

	private static final String FIND_MEMENTO_TYPE = "filteredTreeFindHistory"; //$NON-NLS-1$

	private static final int MAX_HISTORY_ITEMS = 50;

	/**
	* Image descriptor for enabled clear button.
	*/
	private static final String CLEAR_ICON = "org.eclipse.ui.internal.dialogs.CLEAR_ICON"; //$NON-NLS-1$

	/**
	* Image descriptor for enabled clear button.
	*/
	private static final String FIND_ICON = "org.eclipse.ui.internal.dialogs.FIND_ICON"; //$NON-NLS-1$

	/* SWT STYLE BIT AVAILABLE ON 3.5 AND HIGHER */
	public static final int ICON_SEARCH = 1 << 9;

	/* SWT STYLE BIT AVAILABLE ON 3.5 AND HIGHER */
	public static final int ICON_CANCEL = 1 << 8;

	/**
	* Get image descriptors for the clear button.
	*/
	static {
	ImageDescriptor descriptor = AbstractUIPlugin.imageDescriptorFromPlugin(PlatformUI.PLUGIN_ID,
	"$nl$/icons/full/etool16/clear_co.gif"); //$NON-NLS-1$
	if (descriptor != null) {
	JFaceResources.getImageRegistry().put(CLEAR_ICON, descriptor);
	}

	descriptor = AbstractUIPlugin.imageDescriptorFromPlugin(CommonsWorkbenchPlugin.ID_PLUGIN,
	"$nl$/icons/etool16/find.png"); //$NON-NLS-1$
	if (descriptor != null) {
	JFaceResources.getImageRegistry().put(FIND_ICON, descriptor);
	}
	}

	private final Text textControl;

	private Control clearControl;

	private Control findControl;

	private final boolean automaticFind;

	private final Set<SelectionListener> selectionListeners = new HashSet<SelectionListener>();

	private Collection<String> searchHistory = new LinkedHashSet<String>();

	private boolean hasHistorySupport;

	private static Boolean useNativeSearchField;

	@SuppressWarnings("restriction")
	public TextSearchControl(Composite parent, boolean automaticFind, SearchHistoryPopupDialog historyDialog) {
	super(parent, getCompositeStyle(automaticFind, parent));
	this.automaticFind = automaticFind;

	int textStyle = SWT.SINGLE;
	int numColumns = 1;
	if (useNativeSearchField(automaticFind, parent)) {
	if (automaticFind) {
	textStyle \|= SWT.SEARCH \| ICON_CANCEL;
	} else {
	textStyle \|= SWT.SEARCH \| ICON_SEARCH \| ICON_CANCEL;
	}
	} else {
	super.setBackground(getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
	super.setFont(parent.getFont());
	numColumns = 2;
	if (!automaticFind) {
	numColumns += 1;
	}
	}
	GridLayoutFactory.swtDefaults()
	.margins(0, 0)
	.extendedMargins(0, 0, 0, 0)
	.spacing(0, 1)
	.numColumns(numColumns)
	.applyTo(this);

	textControl = new Text(this, textStyle);

	GridData gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
	textControl.setLayoutData(gridData);

	if (useNativeSearchField == null \|\| !useNativeSearchField) {
	findControl = createLabelButtonControl(this, textControl,
	JFaceResources.getImageRegistry().getDescriptor(FIND_ICON),
	Messages.TextControl_AccessibleListenerFindButton, Messages.TextControl_FindToolTip, ICON_SEARCH);
	clearControl = createLabelButtonControl(this, textControl,
	JFaceResources.getImageRegistry().getDescriptor(CLEAR_ICON),
	WorkbenchMessages.FilteredTree_ClearToolTip,//FilteredTree_AccessibleListenerClearButton,
	WorkbenchMessages.FilteredTree_ClearToolTip, ICON_CANCEL);
	addModifyListener(new ModifyListener() {

	public void modifyText(ModifyEvent e) {
	updateButtonVisibilityAndEnablement();

	}
	});
	updateButtonVisibilityAndEnablement();
	}

	if (historyDialog != null) {
	historyDialog.attach(this);
	hasHistorySupport = true;
	}

	registerListeners();
	}

	public boolean hasHistorySupport() {
	return hasHistorySupport;
	}

	private void registerListeners() {
	addSelectionListener(new SelectionAdapter() {

	@Override
	public void widgetDefaultSelected(SelectionEvent e) {
	if (textControl != null && !textControl.isDisposed()) {
	addToSearchHistory(textControl.getText());
	}

	}
	});
	textControl.addFocusListener(new FocusAdapter() {

	@Override
	public void focusLost(FocusEvent e) {
	if (textControl != null && !textControl.isDisposed()) {
	addToSearchHistory(textControl.getText());
	}
	}
	});
	}

	private static int getCompositeStyle(boolean automaticFind, Composite parent) {
	if (useNativeSearchField(automaticFind, parent)) {
	return SWT.NONE;
	}
	return SWT.BORDER;
	}

	private static boolean useNativeSearchField(boolean automaticFind, Composite parent) {
	if (parent != null) {
	if (useNativeSearchField == null) {
	useNativeSearchField = Boolean.FALSE;
	Text testText = null;
	try {
	int style = SWT.SEARCH \| ICON_CANCEL;
	if (automaticFind) {
	style \|= ICON_SEARCH;
	}
	testText = new Text(parent, style);
	useNativeSearchField = Boolean.valueOf((testText.getStyle() & ICON_CANCEL) != 0
	&& (!automaticFind \|\| (testText.getStyle() & ICON_SEARCH) != 0));
	} finally {
	if (testText != null) {
	testText.dispose();
	}
	}

	}
	} else {
	useNativeSearchField = Boolean.FALSE;
	}
	return useNativeSearchField.booleanValue();
	}

	private Control createLabelButtonControl(Composite parent, final Text textControl,
	ImageDescriptor activeImageDescriptor, final String accessibilityText, String toolTipText, final int detail) {

	final Image nativeImage = parent.getDisplay().getSystemImage(detail);

	final Image activeImage = nativeImage != null ? nativeImage : activeImageDescriptor.createImage();
	final Image inactiveImage = new Image(parent.getDisplay(), activeImage, SWT.IMAGE_GRAY);
	final Image pressedImage = inactiveImage;

	final Label labelButton = new Label(parent, SWT.NONE);
	labelButton.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false));
	labelButton.setImage(inactiveImage);
	labelButton.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
	labelButton.setToolTipText(toolTipText);
	labelButton.addDisposeListener(new DisposeListener() {
	public void widgetDisposed(DisposeEvent e) {
	if (nativeImage == null && activeImage != null && !activeImage.isDisposed()) {
	activeImage.dispose();
	}
	if (inactiveImage != null && !inactiveImage.isDisposed()) {
	inactiveImage.dispose();
	}
	if (pressedImage != null && !pressedImage.isDisposed()) {
	pressedImage.dispose();
	}
	}
	});
	labelButton.addMouseListener(new MouseAdapter() {
	private MouseMoveListener fMoveListener;

	@Override
	public void mouseDown(MouseEvent e) {
	labelButton.setImage(pressedImage);
	fMoveListener = new MouseMoveListener() {
	private boolean fMouseInButton = true;

	public void mouseMove(MouseEvent e) {
	boolean mouseInButton = isMouseInButton(e);
	if (mouseInButton != fMouseInButton) {
	fMouseInButton = mouseInButton;
	labelButton.setImage(mouseInButton ? pressedImage : inactiveImage);
	}
	}
	};
	labelButton.addMouseMoveListener(fMoveListener);
	}

	@Override
	public void mouseUp(MouseEvent e) {
	if (fMoveListener != null) {
	labelButton.removeMouseMoveListener(fMoveListener);
	fMoveListener = null;
	boolean mouseInButton = isMouseInButton(e);
	labelButton.setImage(mouseInButton ? activeImage : inactiveImage);
	if (mouseInButton) {
	if (textControl.isEnabled() && textControl.getText().length() > 0) {
	notifySelectionChanged(detail);
	}
	}
	}
	}

	private boolean isMouseInButton(MouseEvent e) {
	Point buttonSize = labelButton.getSize();
	return 0 <= e.x && e.x < buttonSize.x && 0 <= e.y && e.y < buttonSize.y;
	}
	});

	labelButton.addMouseTrackListener(new MouseTrackListener() {
	public void mouseEnter(MouseEvent e) {
	if (labelButton.getImage() != activeImage) {
	labelButton.setImage(activeImage);
	}
	}

	public void mouseExit(MouseEvent e) {
	if (labelButton.getImage() != inactiveImage) {
	labelButton.setImage(inactiveImage);
	}
	}

	public void mouseHover(MouseEvent e) {
	}
	});

	labelButton.getAccessible().addAccessibleListener(new AccessibleAdapter() {
	@Override
	public void getName(AccessibleEvent e) {
	e.result = accessibilityText;
	}
	});
	labelButton.getAccessible().addAccessibleControlListener(new AccessibleControlAdapter() {
	@Override
	public void getRole(AccessibleControlEvent e) {
	e.detail = ACC.ROLE_PUSHBUTTON;
	}
	});
	return labelButton;
	}

	@Override
	public void addTraverseListener(TraverseListener listener) {
	textControl.addTraverseListener(listener);
	}

	@Override
	public void removeTraverseListener(TraverseListener listener) {
	textControl.removeTraverseListener(listener);
	}

	public void addSelectionListener(SelectionListener listener) {
	textControl.addSelectionListener(listener);
	selectionListeners.add(listener);
	}

	public void removeSelectionListener(SelectionListener listener) {
	textControl.removeSelectionListener(listener);
	selectionListeners.remove(listener);
	}

	public void addModifyListener(ModifyListener listener) {
	textControl.addModifyListener(listener);
	}

	public void removeModifyListener(ModifyListener listener) {
	textControl.removeModifyListener(listener);
	}

	private void notifySelectionChanged(int detail) {
	if (useNativeSearchField != null && useNativeSearchField) {
	// notification should happen via the widgets selection listener
	return;
	}
	Event event = new Event();
	event.detail = detail;
	event.widget = textControl;
	event.display = textControl.getDisplay();

	SelectionEvent e = new SelectionEvent(event);
	for (Object element : selectionListeners) {
	((SelectionListener) element).widgetDefaultSelected(e);
	}
	}

	private void updateButtonVisibilityAndEnablement() {
	if (textControl != null && !textControl.isDisposed()) {
	boolean hasText = textControl.getText().length() > 0;

	setFindButtonVisibility(!(hasText && automaticFind));
	setClearButtonVisibility(hasText);
	}
	}

	private void setFindButtonVisibility(boolean visible) {
	if (findControl != null && !findControl.isDisposed()) {
	findControl.setVisible(visible);
	if (findControl.getLayoutData() instanceof GridData) {
	((GridData) findControl.getLayoutData()).exclude = !visible;
	findControl.getParent().layout();
	}
	}
	}

	private void setClearButtonVisibility(boolean visible) {
	if (clearControl != null && !clearControl.isDisposed()) {
	clearControl.setVisible(visible);
	if (clearControl.getLayoutData() instanceof GridData) {
	((GridData) clearControl.getLayoutData()).exclude = !visible;
	clearControl.getParent().layout();
	}
	}
	}

	public Text getTextControl() {
	return textControl;
	}

	public String getText() {
	if (textControl != null && !textControl.isDisposed()) {
	return textControl.getText();
	}
	return ""; //$NON-NLS-1$
	}

	public void setText(String text) {
	if (textControl != null && !textControl.isDisposed()) {
	textControl.setText(text);
	}
	}

	@Override
	public void setBackground(Color color) {
	if (useNativeSearchField != null && useNativeSearchField) {
	super.setBackground(color);
	}
	}

	public Collection<String> getSearchHistory() {
	return Collections.unmodifiableCollection(searchHistory);
	}

	void addToSearchHistory(String searchString) {
	if (searchString != null && searchString.trim().length() > 0) {
	searchHistory.remove(searchString);
	searchHistory.add(searchString);
	}
	}

	public void saveState(IMemento memento) {
	if (memento == null) {
	return;
	}

	IMemento rootMemento = memento.createChild(FIND_MEMENTO_TYPE);
	int i = 0;
	for (String text : searchHistory) {
	IMemento child = rootMemento.createChild(FIND_MEMENTO_ELEMENT);
	child.putString(FIND_TEXT_MEMENTO_ELEMENT, text);
	i++;
	if (i > MAX_HISTORY_ITEMS) {
	break;
	}
	}
	}

	public void restoreState(IMemento memento) {
	if (memento == null) {
	return;
	}
	List<String> history = new ArrayList<String>();

	IMemento rootMemento = memento.getChild(FIND_MEMENTO_TYPE);
	if (rootMemento != null) {
	IMemento[] children = rootMemento.getChildren(FIND_MEMENTO_ELEMENT);
	if (children != null && children.length > 0) {
	for (IMemento child : children) {
	String historyItem = child.getString(FIND_TEXT_MEMENTO_ELEMENT);
	// add to the end of the list
	history.add(history.size(), historyItem);
	}
	}
	}
	if (history != null) {
	searchHistory = history;
	}
	}
	}