org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/preferences/ConsolePreferencePage.java - gerrit/platform/eclipse.platform.debug - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2019 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.debug.internal.ui.preferences;


 import org.eclipse.debug.internal.ui.DebugUIPlugin;
 import org.eclipse.debug.internal.ui.IDebugHelpContextIds;
 import org.eclipse.jface.preference.BooleanFieldEditor;
 import org.eclipse.jface.preference.ColorFieldEditor;
 import org.eclipse.jface.preference.FieldEditor;
 import org.eclipse.jface.preference.FieldEditorPreferencePage;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.preference.IntegerFieldEditor;
 import org.eclipse.jface.util.PropertyChangeEvent;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.console.ConsolePlugin;
 import org.eclipse.ui.console.IConsoleConstants;

 import com.ibm.icu.text.MessageFormat;

 /**
  * A page to set the preferences for the console
  */
 public class ConsolePreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage {

 	/**
 	 * This class exists to provide visibility to the
 	 * <code>refreshValidState</code> method and to perform more intelligent
 	 * clearing of the error message.
 	 */
 	protected class ConsoleIntegerFieldEditor extends IntegerFieldEditor {

 		public ConsoleIntegerFieldEditor(String name, String labelText, Composite parent) {
 			super(name, labelText, parent);
 		}

 		/**
 		 * @see org.eclipse.jface.preference.FieldEditor#refreshValidState()
 		 */
 		@Override
 		protected void refreshValidState() {
 			super.refreshValidState();
 		}

 		/**
 		 * Clears the error message from the message line if the error
 		 * message is the error message from this field editor.
 		 */
 		@Override
 		protected void clearErrorMessage() {
 			if (canClearErrorMessage()) {
 				super.clearErrorMessage();
 			}
 		}
 	}

 	private BooleanFieldEditor2 fWrapEditor;
 	private ConsoleIntegerFieldEditor fWidthEditor;

 	private BooleanFieldEditor2 fUseBufferSize;
 	private ConsoleIntegerFieldEditor fBufferSizeEditor;

 	private ConsoleIntegerFieldEditor fTabSizeEditor;
 	private BooleanFieldEditor autoScrollLockEditor;

 	private BooleanFieldEditor2 fInterpretControlCharactersEditor;
 	private BooleanFieldEditor2 fInterpretCrAsControlCharacterEditor;

 	/**
 	 * Create the console page.
 	 */
 	public ConsolePreferencePage() {
 		super(GRID);
 		setDescription(DebugPreferencesMessages.ConsolePreferencePage_Console_settings);
 		setPreferenceStore(DebugUIPlugin.getDefault().getPreferenceStore());
 	}

 	@Override
 	public void createControl(Composite parent) {
 		super.createControl(parent);
 		PlatformUI.getWorkbench().getHelpSystem().setHelp(
 			getControl(),
 			IDebugHelpContextIds.CONSOLE_PREFERENCE_PAGE );
 	}

 	/**
 	 * Create all field editors for this page
 	 */
 	@Override
 	public void createFieldEditors() {

 		fWrapEditor = new BooleanFieldEditor2(IDebugPreferenceConstants.CONSOLE_WRAP, DebugPreferencesMessages.ConsolePreferencePage_Wrap_text_1, SWT.NONE, getFieldEditorParent());
 		addField(fWrapEditor);

 		fWidthEditor = new ConsoleIntegerFieldEditor(IDebugPreferenceConstants.CONSOLE_WIDTH, DebugPreferencesMessages.ConsolePreferencePage_Console_width, getFieldEditorParent());
 		addField(fWidthEditor);
 		fWidthEditor.setValidRange(80, 1000);
 		fWidthEditor.setErrorMessage(DebugPreferencesMessages.ConsolePreferencePage_console_width);

 		fWrapEditor.getChangeControl(getFieldEditorParent()).addSelectionListener(
 			new SelectionAdapter() {
 				@Override
 				public void widgetSelected(SelectionEvent e) {
 					updateWidthEditor();
 				}
 			}
 		);

 		fUseBufferSize = new BooleanFieldEditor2(IDebugPreferenceConstants.CONSOLE_LIMIT_CONSOLE_OUTPUT, DebugPreferencesMessages.ConsolePreferencePage_Limit_console_output_1, SWT.NONE, getFieldEditorParent());
 		addField(fUseBufferSize);

 		fBufferSizeEditor = new ConsoleIntegerFieldEditor(IDebugPreferenceConstants.CONSOLE_LOW_WATER_MARK, DebugPreferencesMessages.ConsolePreferencePage_Console_buffer_size__characters___2, getFieldEditorParent());
 		addField(fBufferSizeEditor);
 		fBufferSizeEditor.setValidRange(1000, Integer.MAX_VALUE - 100000);
 		fBufferSizeEditor.setErrorMessage(MessageFormat.format(DebugPreferencesMessages.ConsolePreferencePage_The_console_buffer_size_must_be_at_least_1000_characters__1, Integer.valueOf(Integer.MAX_VALUE - 100000)));

 		fUseBufferSize.getChangeControl(getFieldEditorParent()).addSelectionListener(
 			new SelectionAdapter() {
 				@Override
 				public void widgetSelected(SelectionEvent e) {
 					updateBufferSizeEditor();
 				}
 			}
 		);

 		fTabSizeEditor = new ConsoleIntegerFieldEditor(IDebugPreferenceConstants.CONSOLE_TAB_WIDTH, DebugPreferencesMessages.ConsolePreferencePage_12, getFieldEditorParent());
 		addField(fTabSizeEditor);
 		fTabSizeEditor.setValidRange(1,100);
 		fTabSizeEditor.setErrorMessage(DebugPreferencesMessages.ConsolePreferencePage_13);

 		autoScrollLockEditor = new BooleanFieldEditor(IConsoleConstants.P_CONSOLE_AUTO_SCROLL_LOCK, DebugPreferencesMessages.ConsolePreferencePage_Show__Console_View_enable_auto_scroll_lock, SWT.NONE, getFieldEditorParent());
 		addField(autoScrollLockEditor);
 		addField(new BooleanFieldEditor(IDebugPreferenceConstants.CONSOLE_OPEN_ON_OUT, DebugPreferencesMessages.ConsolePreferencePage_Show__Console_View_when_there_is_program_output_3, SWT.NONE, getFieldEditorParent()));
 		addField(new BooleanFieldEditor(IDebugPreferenceConstants.CONSOLE_OPEN_ON_ERR, DebugPreferencesMessages.ConsolePreferencePage_Show__Console_View_when_there_is_program_error_3, SWT.NONE, getFieldEditorParent()));

 		ColorFieldEditor sysout= new ColorFieldEditor(IDebugPreferenceConstants.CONSOLE_SYS_OUT_COLOR, DebugPreferencesMessages.ConsolePreferencePage_Standard_Out__2, getFieldEditorParent());
 		ColorFieldEditor syserr= new ColorFieldEditor(IDebugPreferenceConstants.CONSOLE_SYS_ERR_COLOR, DebugPreferencesMessages.ConsolePreferencePage_Standard_Error__3, getFieldEditorParent());
 		ColorFieldEditor sysin= new ColorFieldEditor(IDebugPreferenceConstants.CONSOLE_SYS_IN_COLOR, DebugPreferencesMessages.ConsolePreferencePage_Standard_In__4, getFieldEditorParent());
 		ColorFieldEditor background= new ColorFieldEditor(IDebugPreferenceConstants.CONSOLE_BAKGROUND_COLOR, DebugPreferencesMessages.ConsolePreferencePage_11, getFieldEditorParent());

 		addField(sysout);
 		addField(syserr);
 		addField(sysin);
 		addField(background);

 		fInterpretControlCharactersEditor = new BooleanFieldEditor2(IDebugPreferenceConstants.CONSOLE_INTERPRET_CONTROL_CHARACTERS, DebugPreferencesMessages.ConsolePreferencePage_Interpret_control_characters, SWT.NONE, getFieldEditorParent());
 		fInterpretCrAsControlCharacterEditor = new BooleanFieldEditor2(IDebugPreferenceConstants.CONSOLE_INTERPRET_CR_AS_CONTROL_CHARACTER, DebugPreferencesMessages.ConsolePreferencePage_Interpret_cr_as_control_character, SWT.NONE, getFieldEditorParent());

 		fInterpretControlCharactersEditor.getChangeControl(getFieldEditorParent()).addListener(SWT.Selection,
 				event -> updateInterpretCrAsControlCharacterEditor());

 		addField(fInterpretControlCharactersEditor);
 		addField(fInterpretCrAsControlCharacterEditor);
 	}

 	/**
 	 * @see IWorkbenchPreferencePage#init(IWorkbench)
 	 */
 	@Override
 	public void init(IWorkbench workbench) {
 	}

 	@Override
 	public boolean performOk() {
 		boolean ok= super.performOk();
 		// update high water mark to be (about) 100 lines (100 * 80 chars) greater than low water mark
 		IPreferenceStore store = DebugUIPlugin.getDefault().getPreferenceStore();
 		int low = store.getInt(IDebugPreferenceConstants.CONSOLE_LOW_WATER_MARK);
 		int high = low + 8000;
 		store.setValue(IDebugPreferenceConstants.CONSOLE_HIGH_WATER_MARK, high);
 		return ok;
 	}

 	/**
 	 * @see org.eclipse.jface.preference.FieldEditorPreferencePage#initialize()
 	 */
 	@Override
 	protected void initialize() {
 		super.initialize();
 		updateWidthEditor();
 		updateAutoScrollLockEditor();
 		updateBufferSizeEditor();
 		updateInterpretCrAsControlCharacterEditor();
 	}

 	/**
 	 * Because the autoscroll value is in another plugin we must update the preference store manually
 	 */
 	protected void updateAutoScrollLockEditor() {
 		autoScrollLockEditor.setPreferenceStore(ConsolePlugin.getDefault().getPreferenceStore());
 		autoScrollLockEditor.load();
 	}

 	/**
 	 * Update enablement of width editor based on enablement of 'fixed width' editor.
 	 */
 	protected void updateWidthEditor() {
 		Button b = fWrapEditor.getChangeControl(getFieldEditorParent());
 		fWidthEditor.getTextControl(getFieldEditorParent()).setEnabled(b.getSelection());
 		fWidthEditor.getLabelControl(getFieldEditorParent()).setEnabled(b.getSelection());
 	}

 	/**
 	 * Update enablement of buffer size editor based on enablement of 'limit
 	 * console output' editor.
 	 */
 	protected void updateBufferSizeEditor() {
 		Button b = fUseBufferSize.getChangeControl(getFieldEditorParent());
 		fBufferSizeEditor.getTextControl(getFieldEditorParent()).setEnabled(b.getSelection());
 		fBufferSizeEditor.getLabelControl(getFieldEditorParent()).setEnabled(b.getSelection());
 	}

 	/**
 	 * Update enablement of carriage return interpretation based on general control
 	 * character interpretation.
 	 */
 	protected void updateInterpretCrAsControlCharacterEditor() {
 		Button b = fInterpretControlCharactersEditor.getChangeControl(getFieldEditorParent());
 		fInterpretCrAsControlCharacterEditor.getChangeControl(getFieldEditorParent()).setEnabled(b.getSelection());
 	}

 	/**
 	 * @see org.eclipse.jface.preference.PreferencePage#performDefaults()
 	 */
 	@Override
 	protected void performDefaults() {
 		super.performDefaults();
 		updateWidthEditor();
 		updateBufferSizeEditor();
 		updateInterpretCrAsControlCharacterEditor();
 	}

 	protected boolean canClearErrorMessage() {
 		return fWidthEditor.isValid() && fBufferSizeEditor.isValid() && fTabSizeEditor.isValid();
 	}

 	/**
 	 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
 	 */
 	@Override
 	public void propertyChange(PropertyChangeEvent event) {

 		if (event.getProperty().equals(FieldEditor.IS_VALID)) {
 			boolean newValue = ((Boolean) event.getNewValue()).booleanValue();
 			// If the new value is true then we must check all field editors.
 			// If it is false, then the page is invalid in any case.
 			if (newValue) {
 				if (fWidthEditor != null && event.getSource() != fWidthEditor) {
 					fWidthEditor.refreshValidState();
 				}
 				if (fBufferSizeEditor != null && event.getSource() != fBufferSizeEditor) {
 					fBufferSizeEditor.refreshValidState();
 				}
 				if (fTabSizeEditor != null && event.getSource() != fTabSizeEditor) {
 					fTabSizeEditor.refreshValidState();
 				}
 				checkState();
 			} else {
 				super.propertyChange(event);
 			}

 		} else {
 			super.propertyChange(event);
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2019 IBM Corporation and others.
	*
	* This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.debug.internal.ui.preferences;


	import org.eclipse.debug.internal.ui.DebugUIPlugin;
	import org.eclipse.debug.internal.ui.IDebugHelpContextIds;
	import org.eclipse.jface.preference.BooleanFieldEditor;
	import org.eclipse.jface.preference.ColorFieldEditor;
	import org.eclipse.jface.preference.FieldEditor;
	import org.eclipse.jface.preference.FieldEditorPreferencePage;
	import org.eclipse.jface.preference.IPreferenceStore;
	import org.eclipse.jface.preference.IntegerFieldEditor;
	import org.eclipse.jface.util.PropertyChangeEvent;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.ui.IWorkbench;
	import org.eclipse.ui.IWorkbenchPreferencePage;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.console.ConsolePlugin;
	import org.eclipse.ui.console.IConsoleConstants;

	import com.ibm.icu.text.MessageFormat;

	/**
	* A page to set the preferences for the console
	*/
	public class ConsolePreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage {

	/**
	* This class exists to provide visibility to the
	* <code>refreshValidState</code> method and to perform more intelligent
	* clearing of the error message.
	*/
	protected class ConsoleIntegerFieldEditor extends IntegerFieldEditor {

	public ConsoleIntegerFieldEditor(String name, String labelText, Composite parent) {
	super(name, labelText, parent);
	}

	/**
	* @see org.eclipse.jface.preference.FieldEditor#refreshValidState()
	*/
	@Override
	protected void refreshValidState() {
	super.refreshValidState();
	}

	/**
	* Clears the error message from the message line if the error
	* message is the error message from this field editor.
	*/
	@Override
	protected void clearErrorMessage() {
	if (canClearErrorMessage()) {
	super.clearErrorMessage();
	}
	}
	}

	private BooleanFieldEditor2 fWrapEditor;
	private ConsoleIntegerFieldEditor fWidthEditor;

	private BooleanFieldEditor2 fUseBufferSize;
	private ConsoleIntegerFieldEditor fBufferSizeEditor;

	private ConsoleIntegerFieldEditor fTabSizeEditor;
	private BooleanFieldEditor autoScrollLockEditor;

	private BooleanFieldEditor2 fInterpretControlCharactersEditor;
	private BooleanFieldEditor2 fInterpretCrAsControlCharacterEditor;

	/**
	* Create the console page.
	*/
	public ConsolePreferencePage() {
	super(GRID);
	setDescription(DebugPreferencesMessages.ConsolePreferencePage_Console_settings);
	setPreferenceStore(DebugUIPlugin.getDefault().getPreferenceStore());
	}

	@Override
	public void createControl(Composite parent) {
	super.createControl(parent);
	PlatformUI.getWorkbench().getHelpSystem().setHelp(
	getControl(),
	IDebugHelpContextIds.CONSOLE_PREFERENCE_PAGE );
	}

	/**
	* Create all field editors for this page
	*/
	@Override
	public void createFieldEditors() {

	fWrapEditor = new BooleanFieldEditor2(IDebugPreferenceConstants.CONSOLE_WRAP, DebugPreferencesMessages.ConsolePreferencePage_Wrap_text_1, SWT.NONE, getFieldEditorParent());
	addField(fWrapEditor);

	fWidthEditor = new ConsoleIntegerFieldEditor(IDebugPreferenceConstants.CONSOLE_WIDTH, DebugPreferencesMessages.ConsolePreferencePage_Console_width, getFieldEditorParent());
	addField(fWidthEditor);
	fWidthEditor.setValidRange(80, 1000);
	fWidthEditor.setErrorMessage(DebugPreferencesMessages.ConsolePreferencePage_console_width);

	fWrapEditor.getChangeControl(getFieldEditorParent()).addSelectionListener(
	new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	updateWidthEditor();
	}
	}
	);

	fUseBufferSize = new BooleanFieldEditor2(IDebugPreferenceConstants.CONSOLE_LIMIT_CONSOLE_OUTPUT, DebugPreferencesMessages.ConsolePreferencePage_Limit_console_output_1, SWT.NONE, getFieldEditorParent());
	addField(fUseBufferSize);

	fBufferSizeEditor = new ConsoleIntegerFieldEditor(IDebugPreferenceConstants.CONSOLE_LOW_WATER_MARK, DebugPreferencesMessages.ConsolePreferencePage_Console_buffer_size__characters___2, getFieldEditorParent());
	addField(fBufferSizeEditor);
	fBufferSizeEditor.setValidRange(1000, Integer.MAX_VALUE - 100000);
	fBufferSizeEditor.setErrorMessage(MessageFormat.format(DebugPreferencesMessages.ConsolePreferencePage_The_console_buffer_size_must_be_at_least_1000_characters__1, Integer.valueOf(Integer.MAX_VALUE - 100000)));

	fUseBufferSize.getChangeControl(getFieldEditorParent()).addSelectionListener(
	new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	updateBufferSizeEditor();
	}
	}
	);

	fTabSizeEditor = new ConsoleIntegerFieldEditor(IDebugPreferenceConstants.CONSOLE_TAB_WIDTH, DebugPreferencesMessages.ConsolePreferencePage_12, getFieldEditorParent());
	addField(fTabSizeEditor);
	fTabSizeEditor.setValidRange(1,100);
	fTabSizeEditor.setErrorMessage(DebugPreferencesMessages.ConsolePreferencePage_13);

	autoScrollLockEditor = new BooleanFieldEditor(IConsoleConstants.P_CONSOLE_AUTO_SCROLL_LOCK, DebugPreferencesMessages.ConsolePreferencePage_Show__Console_View_enable_auto_scroll_lock, SWT.NONE, getFieldEditorParent());
	addField(autoScrollLockEditor);
	addField(new BooleanFieldEditor(IDebugPreferenceConstants.CONSOLE_OPEN_ON_OUT, DebugPreferencesMessages.ConsolePreferencePage_Show__Console_View_when_there_is_program_output_3, SWT.NONE, getFieldEditorParent()));
	addField(new BooleanFieldEditor(IDebugPreferenceConstants.CONSOLE_OPEN_ON_ERR, DebugPreferencesMessages.ConsolePreferencePage_Show__Console_View_when_there_is_program_error_3, SWT.NONE, getFieldEditorParent()));

	ColorFieldEditor sysout= new ColorFieldEditor(IDebugPreferenceConstants.CONSOLE_SYS_OUT_COLOR, DebugPreferencesMessages.ConsolePreferencePage_Standard_Out__2, getFieldEditorParent());
	ColorFieldEditor syserr= new ColorFieldEditor(IDebugPreferenceConstants.CONSOLE_SYS_ERR_COLOR, DebugPreferencesMessages.ConsolePreferencePage_Standard_Error__3, getFieldEditorParent());
	ColorFieldEditor sysin= new ColorFieldEditor(IDebugPreferenceConstants.CONSOLE_SYS_IN_COLOR, DebugPreferencesMessages.ConsolePreferencePage_Standard_In__4, getFieldEditorParent());
	ColorFieldEditor background= new ColorFieldEditor(IDebugPreferenceConstants.CONSOLE_BAKGROUND_COLOR, DebugPreferencesMessages.ConsolePreferencePage_11, getFieldEditorParent());

	addField(sysout);
	addField(syserr);
	addField(sysin);
	addField(background);

	fInterpretControlCharactersEditor = new BooleanFieldEditor2(IDebugPreferenceConstants.CONSOLE_INTERPRET_CONTROL_CHARACTERS, DebugPreferencesMessages.ConsolePreferencePage_Interpret_control_characters, SWT.NONE, getFieldEditorParent());
	fInterpretCrAsControlCharacterEditor = new BooleanFieldEditor2(IDebugPreferenceConstants.CONSOLE_INTERPRET_CR_AS_CONTROL_CHARACTER, DebugPreferencesMessages.ConsolePreferencePage_Interpret_cr_as_control_character, SWT.NONE, getFieldEditorParent());

	fInterpretControlCharactersEditor.getChangeControl(getFieldEditorParent()).addListener(SWT.Selection,
	event -> updateInterpretCrAsControlCharacterEditor());

	addField(fInterpretControlCharactersEditor);
	addField(fInterpretCrAsControlCharacterEditor);
	}

	/**
	* @see IWorkbenchPreferencePage#init(IWorkbench)
	*/
	@Override
	public void init(IWorkbench workbench) {
	}

	@Override
	public boolean performOk() {
	boolean ok= super.performOk();
	// update high water mark to be (about) 100 lines (100 * 80 chars) greater than low water mark
	IPreferenceStore store = DebugUIPlugin.getDefault().getPreferenceStore();
	int low = store.getInt(IDebugPreferenceConstants.CONSOLE_LOW_WATER_MARK);
	int high = low + 8000;
	store.setValue(IDebugPreferenceConstants.CONSOLE_HIGH_WATER_MARK, high);
	return ok;
	}

	/**
	* @see org.eclipse.jface.preference.FieldEditorPreferencePage#initialize()
	*/
	@Override
	protected void initialize() {
	super.initialize();
	updateWidthEditor();
	updateAutoScrollLockEditor();
	updateBufferSizeEditor();
	updateInterpretCrAsControlCharacterEditor();
	}

	/**
	* Because the autoscroll value is in another plugin we must update the preference store manually
	*/
	protected void updateAutoScrollLockEditor() {
	autoScrollLockEditor.setPreferenceStore(ConsolePlugin.getDefault().getPreferenceStore());
	autoScrollLockEditor.load();
	}

	/**
	* Update enablement of width editor based on enablement of 'fixed width' editor.
	*/
	protected void updateWidthEditor() {
	Button b = fWrapEditor.getChangeControl(getFieldEditorParent());
	fWidthEditor.getTextControl(getFieldEditorParent()).setEnabled(b.getSelection());
	fWidthEditor.getLabelControl(getFieldEditorParent()).setEnabled(b.getSelection());
	}

	/**
	* Update enablement of buffer size editor based on enablement of 'limit
	* console output' editor.
	*/
	protected void updateBufferSizeEditor() {
	Button b = fUseBufferSize.getChangeControl(getFieldEditorParent());
	fBufferSizeEditor.getTextControl(getFieldEditorParent()).setEnabled(b.getSelection());
	fBufferSizeEditor.getLabelControl(getFieldEditorParent()).setEnabled(b.getSelection());
	}

	/**
	* Update enablement of carriage return interpretation based on general control
	* character interpretation.
	*/
	protected void updateInterpretCrAsControlCharacterEditor() {
	Button b = fInterpretControlCharactersEditor.getChangeControl(getFieldEditorParent());
	fInterpretCrAsControlCharacterEditor.getChangeControl(getFieldEditorParent()).setEnabled(b.getSelection());
	}

	/**
	* @see org.eclipse.jface.preference.PreferencePage#performDefaults()
	*/
	@Override
	protected void performDefaults() {
	super.performDefaults();
	updateWidthEditor();
	updateBufferSizeEditor();
	updateInterpretCrAsControlCharacterEditor();
	}

	protected boolean canClearErrorMessage() {
	return fWidthEditor.isValid() && fBufferSizeEditor.isValid() && fTabSizeEditor.isValid();
	}

	/**
	* @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
	*/
	@Override
	public void propertyChange(PropertyChangeEvent event) {

	if (event.getProperty().equals(FieldEditor.IS_VALID)) {
	boolean newValue = ((Boolean) event.getNewValue()).booleanValue();
	// If the new value is true then we must check all field editors.
	// If it is false, then the page is invalid in any case.
	if (newValue) {
	if (fWidthEditor != null && event.getSource() != fWidthEditor) {
	fWidthEditor.refreshValidState();
	}
	if (fBufferSizeEditor != null && event.getSource() != fBufferSizeEditor) {
	fBufferSizeEditor.refreshValidState();
	}
	if (fTabSizeEditor != null && event.getSource() != fTabSizeEditor) {
	fTabSizeEditor.refreshValidState();
	}
	checkState();
	} else {
	super.propertyChange(event);
	}

	} else {
	super.propertyChange(event);
	}
	}
	}