build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/ui/properties/BuildOptionListFieldEditor.java - cdt/org.eclipse.cdt - Git at Google

 package org.eclipse.cdt.managedbuilder.ui.properties;

 /**********************************************************************
  * Copyright (c) 2002,2003 Rational Software Corporation and others.
  * All rights reserved.   This program and the accompanying materials
  * are made available under the terms of the Common Public License v0.5
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v05.html
  *
  * Contributors:
  * IBM Rational Software - Initial API and implementation
  * **********************************************************************/

 import org.eclipse.cdt.managedbuilder.internal.ui.ManagedBuilderUIPlugin;
 import org.eclipse.cdt.utils.ui.controls.ControlFactory;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.dialogs.InputDialog;
 import org.eclipse.jface.preference.FieldEditor;
 import org.eclipse.jface.util.Assert;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.DisposeEvent;
 import org.eclipse.swt.events.DisposeListener;
 import org.eclipse.swt.events.MouseAdapter;
 import org.eclipse.swt.events.MouseEvent;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 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.List;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Widget;

 public class BuildOptionListFieldEditor extends FieldEditor {
 	// Label constants
 	private static final String TITLE = "BuildPropertyCommon.label.title";	//$NON-NLS-1$
 	private static final String NEW = "BuildPropertyCommon.label.new"; //$NON-NLS-1$
 	private static final String REMOVE = "BuildPropertyCommon.label.remove"; //$NON-NLS-1$
 	private static final String UP = "BuildPropertyCommon.label.up"; //$NON-NLS-1$
 	private static final String DOWN = "BuildPropertyCommon.label.down"; //$NON-NLS-1$
 	private static final String EDIT = "BuildPropertyCommon.label.editVar"; //$NON-NLS-1$

 	// UI constants
 	private static final int VERTICAL_DIALOG_UNITS_PER_CHAR = 8;
 	private static final int HORIZONTAL_DIALOG_UNITS_PER_CHAR = 4;
 	private static final int LIST_HEIGHT_IN_CHARS = 10;
 	private static final int LIST_HEIGHT_IN_DLUS =
 		LIST_HEIGHT_IN_CHARS * VERTICAL_DIALOG_UNITS_PER_CHAR;

 	// The top-level control for the field editor.
 	private Composite top;
 	// The list of tags.
 	private List list;

 	// The group control for the list and button composite
 	private Group controlGroup;

 	private String fieldName;
 	private SelectionListener selectionListener;

 	// The button for adding the contents of the text field to the list
 	private Button addButton;
 	// The button for swapping the currently-selected list item down
 	private Button downButton;
 	// The button to start the edit process
 	private Button editButton;
 	// The button for removing the currently-selected list item.
 	private Button removeButton;
 	// The button for swapping the currently selected item up
 	private Button upButton;

 	/**
 	* @param name the name of the preference this field editor works on
 	* @param labelText the label text of the field editor
 	* @param parent the parent of the field editor's control
 	*/
 	public BuildOptionListFieldEditor (String name, String labelText, Composite parent) {
 		super(name, labelText, parent);
 		this.fieldName = labelText;
 	}

 	/* (non-Javadoc)
 	 * Event handler for the addButton widget
 	 */
 	protected void addPressed() {
 		setPresentsDefaultValue(false);
 		// Prompt user for a new item
 		String input = getNewInputObject();

 		// Add it to the list
 		if (input != null && input.length() > 0) {
 			int index = list.getSelectionIndex();
 			if (index >= 0) {
 				list.add(input, index + 1);
 				list.setSelection(index + 1);
 			}
 			else {
 				list.add(input, 0);
 				list.setSelection(0);
 			}
 			selectionChanged();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.preference.FieldEditor#adjustForNumColumns(int)
 	 */
 	protected void adjustForNumColumns(int numColumns) {
 		((GridData)top.getLayoutData()).horizontalSpan = numColumns;
 	}

 	/* (non-Javadoc)
 	 * Creates the Add, Remove, Up, and Down button in the button composite.
 	 *
 	 * @param container the box for the buttons
 	 */
 	private void createButtons(Composite container) {
 		addButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(NEW));
 		editButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(EDIT));
 		removeButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(REMOVE));
 		upButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(UP));
 		downButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(DOWN));
 	}

 	/**
 	 * @param items
 	 * @return
 	 */
 	protected String createList(String[] items) {
 		return BuildToolsSettingsStore.createList(items);
 	}

 	/* (non-Javadoc)
 	 * Rather than using the ControlFactory helper methods, this field
 	 * editor is using this helper method. Other field editors use a similar
 	 * set of method calls, so this seems like the safest approach
 	 *
 	 * @param parent the button composite
 	 * @param label the label to place in the button
 	 * @return
 	 */
 	private Button createPushButton(Composite parent, String label) {
 		Button button = new Button(parent, SWT.PUSH);
 		button.setText(label);
 		button.setFont(parent.getFont());
 		GridData data = new GridData(GridData.FILL_HORIZONTAL);
 		data.heightHint = convertVerticalDLUsToPixels(button, IDialogConstants.BUTTON_HEIGHT);
 		int widthHint = convertHorizontalDLUsToPixels(button, IDialogConstants.BUTTON_WIDTH);
 		data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
 		button.setLayoutData(data);
 		button.addSelectionListener(getSelectionListener());
 		return button;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.preference.FieldEditor#doFillIntoGrid(org.eclipse.swt.widgets.Composite, int)
 	 */
 	protected void doFillIntoGrid(Composite parent, int numColumns) {
 		top = parent;
 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = numColumns;
 		top.setLayoutData(gd);

 		controlGroup = ControlFactory.createGroup(top, getLabelText(), 2);
 		GridData groupData = new GridData(GridData.FILL_HORIZONTAL);
 		groupData.horizontalSpan = numColumns;
 		controlGroup.setLayoutData(groupData);

 		// Make the list
 		list = new List(controlGroup, SWT.SINGLE | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);

 		// Create a grid data that takes up the extra space in the dialog and spans one column.
 		GridData listData = new GridData(GridData.FILL_HORIZONTAL);
 		listData.heightHint =
 			convertVerticalDLUsToPixels(list, LIST_HEIGHT_IN_DLUS);
 		listData.horizontalSpan = 1;

 		list.setLayoutData(listData);
 		list.addSelectionListener(new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent e) {
 				selectionChanged();
 			}
 		});

 		list.addDisposeListener(new DisposeListener() {
 			public void widgetDisposed(DisposeEvent event) {
 				list = null;
 			}
 		});
 		list.addMouseListener(new MouseAdapter() {
 			public void mouseDoubleClick(MouseEvent e) {
 				// Popup the editor on the selected item from the list
 				editSelection();
 			}
 		});

 		// Create a composite for the buttons
 		Composite buttonGroup = new Composite(controlGroup, SWT.NONE);
 		GridData buttonData = new GridData();
 		buttonData.horizontalSpan = 1;
 		buttonData.verticalAlignment = GridData.BEGINNING;
 		buttonGroup.setLayoutData(buttonData);

 		GridLayout buttonLayout = new GridLayout();
 		buttonLayout.numColumns = 1;
 		buttonLayout.marginHeight = 0;
 		buttonLayout.marginWidth = 0;
 		buttonGroup.setLayout(buttonLayout);

 		buttonGroup.addDisposeListener(new DisposeListener() {
 			public void widgetDisposed(DisposeEvent event) {
 				addButton = null;
 				editButton = null;
 				removeButton = null;
 				upButton = null;
 				downButton = null;
 			}
 		});

 		// Create the buttons
 		createButtons(buttonGroup);
 	}

 	/* (non-Javadoc)
 	 * Creates a selection listener that handles the selection events
 	 * for the button controls and single-click events in the list to
 	 * trigger a selection change.
 	 */
 	public void createSelectionListener() {
 		selectionListener = new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent event) {
 				Widget widget = event.widget;
 				if (widget == addButton) {
 					addPressed();
 				} else if (widget == editButton) {
 					editPressed();
 				} else if (widget == removeButton) {
 					removePressed();
 				} else if (widget == upButton) {
 					upPressed();
 				} else if (widget == downButton) {
 					downPressed();
 				} else if (widget == list) {
 					selectionChanged();
 				}
 			}

 		};
 	}


 	/* (non-Javadoc)
 	 * Event handler for the down button
 	 */
 	protected void downPressed() {
 		swap(false);
 	}

 	private void editPressed() {
 		editSelection();
 	}

 	/* (non-Javadoc)
 	 *
 	 */
 	protected void editSelection() {
 		// Edit the selection index
 		int index = list.getSelectionIndex();
 		if (index != -1) {
 			String selItem = list.getItem(index);
 			if (selItem != null) {
 				InputDialog dialog = new InputDialog(getShell(), ManagedBuilderUIPlugin.getResourceString(TITLE), fieldName, selItem, null);
 				String newItem = null;
 				if (dialog.open() == InputDialog.OK) {
 					newItem = dialog.getValue();
 					if (newItem != null && !newItem.equals(selItem)) {
 						list.setItem(index, newItem);
 						selectionChanged();
 					}
 				}
 			}
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.preference.FieldEditor#doLoad()
 	 */
 	protected void doLoad() {
 		if (list != null) {
 			String s = getPreferenceStore().getString(getPreferenceName());
 			String[] array = parseString(s);
 			for (int i = 0; i < array.length; i++){
 				list.add(array[i]);
 			}
 			list.setSelection(0);
 			selectionChanged();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.preference.FieldEditor#doLoadDefault()
 	 */
 	protected void doLoadDefault() {
 		if (list != null) {
 			list.removeAll();
 			String s = getPreferenceStore().getDefaultString(getPreferenceName());
 			String[] array = parseString(s);
 			for (int i = 0; i < array.length; i++){
 				list.add(array[i]);
 			}
 			list.setSelection(0);
 			selectionChanged();
 		}
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.preference.FieldEditor#doStore()
 	 */
 	protected void doStore() {
 		String s = createList(list.getItems());
 		if (s != null)
 			getPreferenceStore().setValue(getPreferenceName(), s);
 	}

 	protected String getNewInputObject() {
 		// Create a dialog to prompt for a new symbol or path
 		InputDialog dialog = new InputDialog(getShell(), ManagedBuilderUIPlugin.getResourceString(TITLE), fieldName, new String(), null);
 		String input = new String();
 		if (dialog.open() == InputDialog.OK) {
 			input = dialog.getValue();
 		}
 		return input;
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.jface.preference.FieldEditor#getNumberOfControls()
 	 */
 	public int getNumberOfControls() {
 		// The group control has a list and buttons so we want it to get at
 		// least 2 columns to display in.
 		return 2;
 	}

 	/* (non-Javadoc)
 	 * Returns this field editor's selection listener.
 	 * The listener is created if nessessary.
 	 *
 	 * @return the selection listener
 	 */
 	private SelectionListener getSelectionListener() {
 		if (selectionListener == null)
 			createSelectionListener();
 		return selectionListener;
 	}

 	/* (non-Javadoc)
 	 * Returns this field editor's shell.
 	 *
 	 * @return the shell
 	 */
 	protected Shell getShell() {
 		if (addButton == null)
 			return null;
 		return addButton.getShell();
 	}

 	/* (non-Javadoc)
 	 * @param stringList
 	 * @return
 	 */
 	protected String[] parseString(String stringList) {
 		return BuildToolsSettingsStore.parseString(stringList);
 	}

 	/* (non-Javadoc)
 	 * Event handler for the removeButton selected event
 	 */
 	protected void removePressed() {
 		// Remove the selected item from the list
 		setPresentsDefaultValue(false);
 		int index = list.getSelectionIndex();
 		if (index >= 0) {
 			list.remove(index);
 			list.setSelection(index - 1);
 			selectionChanged();
 		}
 	}

 	/* (non-Javadoc)
 	 * Clean up the list and button control states after the event
 	 * handlers fire.
 	 */
 	protected void selectionChanged() {
 		int index = list.getSelectionIndex();
 		int size = list.getItemCount();

 		// Enable the edit button if there is at least one item in the list
 		editButton.setEnabled(size > 0);
 		// Enable the remove button if there is at least one item in the list
 		removeButton.setEnabled(size > 0);
 		// Enable the up button IFF there is more than 1 item and selection index is not first item
 		upButton.setEnabled(size > 1 && index > 0);
 		// Enable the down button IFF there is more than 1 item and selection index not last item
 		downButton.setEnabled(size > 1 && index >= 0 && index < size - 1);
 	}

 	/* (non-Javadoc)
 	 * Swaps the location of two list elements. If the argument is <code>true</code>
 	 * the list item is swapped with the item preceeding it in the list. Otherwise
 	 *  it is swapped with the item following it.
 	 *
 	 * @param moveUp
 	 */
 	private void swap(boolean moveUp) {
 		setPresentsDefaultValue(false);
 		int index = list.getSelectionIndex();
 		int target = moveUp ? index - 1 : index + 1;

 		if (index >= 0) {
 			String[] selection = list.getSelection();
 			Assert.isTrue(selection.length == 1);
 			list.remove(index);
 			list.add(selection[0], target);
 			list.setSelection(target);
 		}
 		selectionChanged();
 	}

 	/* (non-Javadoc)
 	 * Event handler for the up button. It simply swaps the selected
 	 * item with the list item above it.
 	 */
 	protected void upPressed() {
 		swap(true);
 	}
 }
	package org.eclipse.cdt.managedbuilder.ui.properties;

	/**********************************************************************
	* Copyright (c) 2002,2003 Rational Software Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Common Public License v0.5
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/cpl-v05.html
	*
	* Contributors:
	* IBM Rational Software - Initial API and implementation
	* **********************************************************************/

	import org.eclipse.cdt.managedbuilder.internal.ui.ManagedBuilderUIPlugin;
	import org.eclipse.cdt.utils.ui.controls.ControlFactory;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.dialogs.InputDialog;
	import org.eclipse.jface.preference.FieldEditor;
	import org.eclipse.jface.util.Assert;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.DisposeEvent;
	import org.eclipse.swt.events.DisposeListener;
	import org.eclipse.swt.events.MouseAdapter;
	import org.eclipse.swt.events.MouseEvent;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	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.List;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.swt.widgets.Widget;

	public class BuildOptionListFieldEditor extends FieldEditor {
	// Label constants
	private static final String TITLE = "BuildPropertyCommon.label.title"; //$NON-NLS-1$
	private static final String NEW = "BuildPropertyCommon.label.new"; //$NON-NLS-1$
	private static final String REMOVE = "BuildPropertyCommon.label.remove"; //$NON-NLS-1$
	private static final String UP = "BuildPropertyCommon.label.up"; //$NON-NLS-1$
	private static final String DOWN = "BuildPropertyCommon.label.down"; //$NON-NLS-1$
	private static final String EDIT = "BuildPropertyCommon.label.editVar"; //$NON-NLS-1$

	// UI constants
	private static final int VERTICAL_DIALOG_UNITS_PER_CHAR = 8;
	private static final int HORIZONTAL_DIALOG_UNITS_PER_CHAR = 4;
	private static final int LIST_HEIGHT_IN_CHARS = 10;
	private static final int LIST_HEIGHT_IN_DLUS =
	LIST_HEIGHT_IN_CHARS * VERTICAL_DIALOG_UNITS_PER_CHAR;

	// The top-level control for the field editor.
	private Composite top;
	// The list of tags.
	private List list;

	// The group control for the list and button composite
	private Group controlGroup;

	private String fieldName;
	private SelectionListener selectionListener;

	// The button for adding the contents of the text field to the list
	private Button addButton;
	// The button for swapping the currently-selected list item down
	private Button downButton;
	// The button to start the edit process
	private Button editButton;
	// The button for removing the currently-selected list item.
	private Button removeButton;
	// The button for swapping the currently selected item up
	private Button upButton;

	/**
	* @param name the name of the preference this field editor works on
	* @param labelText the label text of the field editor
	* @param parent the parent of the field editor's control
	*/
	public BuildOptionListFieldEditor (String name, String labelText, Composite parent) {
	super(name, labelText, parent);
	this.fieldName = labelText;
	}

	/* (non-Javadoc)
	* Event handler for the addButton widget
	*/
	protected void addPressed() {
	setPresentsDefaultValue(false);
	// Prompt user for a new item
	String input = getNewInputObject();

	// Add it to the list
	if (input != null && input.length() > 0) {
	int index = list.getSelectionIndex();
	if (index >= 0) {
	list.add(input, index + 1);
	list.setSelection(index + 1);
	}
	else {
	list.add(input, 0);
	list.setSelection(0);
	}
	selectionChanged();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.preference.FieldEditor#adjustForNumColumns(int)
	*/
	protected void adjustForNumColumns(int numColumns) {
	((GridData)top.getLayoutData()).horizontalSpan = numColumns;
	}

	/* (non-Javadoc)
	* Creates the Add, Remove, Up, and Down button in the button composite.
	*
	* @param container the box for the buttons
	*/
	private void createButtons(Composite container) {
	addButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(NEW));
	editButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(EDIT));
	removeButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(REMOVE));
	upButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(UP));
	downButton = createPushButton(container, ManagedBuilderUIPlugin.getResourceString(DOWN));
	}

	/**
	* @param items
	* @return
	*/
	protected String createList(String[] items) {
	return BuildToolsSettingsStore.createList(items);
	}

	/* (non-Javadoc)
	* Rather than using the ControlFactory helper methods, this field
	* editor is using this helper method. Other field editors use a similar
	* set of method calls, so this seems like the safest approach
	*
	* @param parent the button composite
	* @param label the label to place in the button
	* @return
	*/
	private Button createPushButton(Composite parent, String label) {
	Button button = new Button(parent, SWT.PUSH);
	button.setText(label);
	button.setFont(parent.getFont());
	GridData data = new GridData(GridData.FILL_HORIZONTAL);
	data.heightHint = convertVerticalDLUsToPixels(button, IDialogConstants.BUTTON_HEIGHT);
	int widthHint = convertHorizontalDLUsToPixels(button, IDialogConstants.BUTTON_WIDTH);
	data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
	button.setLayoutData(data);
	button.addSelectionListener(getSelectionListener());
	return button;
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.preference.FieldEditor#doFillIntoGrid(org.eclipse.swt.widgets.Composite, int)
	*/
	protected void doFillIntoGrid(Composite parent, int numColumns) {
	top = parent;
	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = numColumns;
	top.setLayoutData(gd);

	controlGroup = ControlFactory.createGroup(top, getLabelText(), 2);
	GridData groupData = new GridData(GridData.FILL_HORIZONTAL);
	groupData.horizontalSpan = numColumns;
	controlGroup.setLayoutData(groupData);

	// Make the list
	list = new List(controlGroup, SWT.SINGLE \| SWT.BORDER \| SWT.H_SCROLL \| SWT.V_SCROLL);

	// Create a grid data that takes up the extra space in the dialog and spans one column.
	GridData listData = new GridData(GridData.FILL_HORIZONTAL);
	listData.heightHint =
	convertVerticalDLUsToPixels(list, LIST_HEIGHT_IN_DLUS);
	listData.horizontalSpan = 1;

	list.setLayoutData(listData);
	list.addSelectionListener(new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {
	selectionChanged();
	}
	});

	list.addDisposeListener(new DisposeListener() {
	public void widgetDisposed(DisposeEvent event) {
	list = null;
	}
	});
	list.addMouseListener(new MouseAdapter() {
	public void mouseDoubleClick(MouseEvent e) {
	// Popup the editor on the selected item from the list
	editSelection();
	}
	});

	// Create a composite for the buttons
	Composite buttonGroup = new Composite(controlGroup, SWT.NONE);
	GridData buttonData = new GridData();
	buttonData.horizontalSpan = 1;
	buttonData.verticalAlignment = GridData.BEGINNING;
	buttonGroup.setLayoutData(buttonData);

	GridLayout buttonLayout = new GridLayout();
	buttonLayout.numColumns = 1;
	buttonLayout.marginHeight = 0;
	buttonLayout.marginWidth = 0;
	buttonGroup.setLayout(buttonLayout);

	buttonGroup.addDisposeListener(new DisposeListener() {
	public void widgetDisposed(DisposeEvent event) {
	addButton = null;
	editButton = null;
	removeButton = null;
	upButton = null;
	downButton = null;
	}
	});

	// Create the buttons
	createButtons(buttonGroup);
	}

	/* (non-Javadoc)
	* Creates a selection listener that handles the selection events
	* for the button controls and single-click events in the list to
	* trigger a selection change.
	*/
	public void createSelectionListener() {
	selectionListener = new SelectionAdapter() {
	public void widgetSelected(SelectionEvent event) {
	Widget widget = event.widget;
	if (widget == addButton) {
	addPressed();
	} else if (widget == editButton) {
	editPressed();
	} else if (widget == removeButton) {
	removePressed();
	} else if (widget == upButton) {
	upPressed();
	} else if (widget == downButton) {
	downPressed();
	} else if (widget == list) {
	selectionChanged();
	}
	}

	};
	}



	/* (non-Javadoc)
	* Event handler for the down button
	*/
	protected void downPressed() {
	swap(false);
	}

	private void editPressed() {
	editSelection();
	}

	/* (non-Javadoc)
	*
	*/
	protected void editSelection() {
	// Edit the selection index
	int index = list.getSelectionIndex();
	if (index != -1) {
	String selItem = list.getItem(index);
	if (selItem != null) {
	InputDialog dialog = new InputDialog(getShell(), ManagedBuilderUIPlugin.getResourceString(TITLE), fieldName, selItem, null);
	String newItem = null;
	if (dialog.open() == InputDialog.OK) {
	newItem = dialog.getValue();
	if (newItem != null && !newItem.equals(selItem)) {
	list.setItem(index, newItem);
	selectionChanged();
	}
	}
	}
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.preference.FieldEditor#doLoad()
	*/
	protected void doLoad() {
	if (list != null) {
	String s = getPreferenceStore().getString(getPreferenceName());
	String[] array = parseString(s);
	for (int i = 0; i < array.length; i++){
	list.add(array[i]);
	}
	list.setSelection(0);
	selectionChanged();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.preference.FieldEditor#doLoadDefault()
	*/
	protected void doLoadDefault() {
	if (list != null) {
	list.removeAll();
	String s = getPreferenceStore().getDefaultString(getPreferenceName());
	String[] array = parseString(s);
	for (int i = 0; i < array.length; i++){
	list.add(array[i]);
	}
	list.setSelection(0);
	selectionChanged();
	}
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.preference.FieldEditor#doStore()
	*/
	protected void doStore() {
	String s = createList(list.getItems());
	if (s != null)
	getPreferenceStore().setValue(getPreferenceName(), s);
	}

	protected String getNewInputObject() {
	// Create a dialog to prompt for a new symbol or path
	InputDialog dialog = new InputDialog(getShell(), ManagedBuilderUIPlugin.getResourceString(TITLE), fieldName, new String(), null);
	String input = new String();
	if (dialog.open() == InputDialog.OK) {
	input = dialog.getValue();
	}
	return input;
	}

	/* (non-Javadoc)
	* @see org.eclipse.jface.preference.FieldEditor#getNumberOfControls()
	*/
	public int getNumberOfControls() {
	// The group control has a list and buttons so we want it to get at
	// least 2 columns to display in.
	return 2;
	}

	/* (non-Javadoc)
	* Returns this field editor's selection listener.
	* The listener is created if nessessary.
	*
	* @return the selection listener
	*/
	private SelectionListener getSelectionListener() {
	if (selectionListener == null)
	createSelectionListener();
	return selectionListener;
	}

	/* (non-Javadoc)
	* Returns this field editor's shell.
	*
	* @return the shell
	*/
	protected Shell getShell() {
	if (addButton == null)
	return null;
	return addButton.getShell();
	}

	/* (non-Javadoc)
	* @param stringList
	* @return
	*/
	protected String[] parseString(String stringList) {
	return BuildToolsSettingsStore.parseString(stringList);
	}

	/* (non-Javadoc)
	* Event handler for the removeButton selected event
	*/
	protected void removePressed() {
	// Remove the selected item from the list
	setPresentsDefaultValue(false);
	int index = list.getSelectionIndex();
	if (index >= 0) {
	list.remove(index);
	list.setSelection(index - 1);
	selectionChanged();
	}
	}

	/* (non-Javadoc)
	* Clean up the list and button control states after the event
	* handlers fire.
	*/
	protected void selectionChanged() {
	int index = list.getSelectionIndex();
	int size = list.getItemCount();

	// Enable the edit button if there is at least one item in the list
	editButton.setEnabled(size > 0);
	// Enable the remove button if there is at least one item in the list
	removeButton.setEnabled(size > 0);
	// Enable the up button IFF there is more than 1 item and selection index is not first item
	upButton.setEnabled(size > 1 && index > 0);
	// Enable the down button IFF there is more than 1 item and selection index not last item
	downButton.setEnabled(size > 1 && index >= 0 && index < size - 1);
	}

	/* (non-Javadoc)
	* Swaps the location of two list elements. If the argument is <code>true</code>
	* the list item is swapped with the item preceeding it in the list. Otherwise
	* it is swapped with the item following it.
	*
	* @param moveUp
	*/
	private void swap(boolean moveUp) {
	setPresentsDefaultValue(false);
	int index = list.getSelectionIndex();
	int target = moveUp ? index - 1 : index + 1;

	if (index >= 0) {
	String[] selection = list.getSelection();
	Assert.isTrue(selection.length == 1);
	list.remove(index);
	list.add(selection[0], target);
	list.setSelection(target);
	}
	selectionChanged();
	}

	/* (non-Javadoc)
	* Event handler for the up button. It simply swaps the selected
	* item with the list item above it.
	*/
	protected void upPressed() {
	swap(true);
	}
	}