core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/preferences/AbstractPreferencePage.java - cdt/org.eclipse.cdt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2002, 2014 QNX Software Systems 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:
  *     QNX Software Systems - Initial API and implementation
  *     IBM Corporation
  *     Anton Leherbauer (Wind River Systems)
  *     Serge Beauchamp (Freescale Semiconductor) - Bug 418817
  *     Sergey Prigogin (Google)
  *******************************************************************************/
 package org.eclipse.cdt.internal.ui.preferences;

 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.Map;
 import java.util.Set;

 import org.eclipse.cdt.internal.ui.dialogs.StatusInfo;
 import org.eclipse.cdt.internal.ui.dialogs.StatusUtil;
 import org.eclipse.cdt.ui.PreferenceConstants;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.jface.layout.PixelConverter;
 import org.eclipse.jface.preference.ColorSelector;
 import org.eclipse.jface.preference.PreferenceConverter;
 import org.eclipse.jface.preference.PreferencePage;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.ModifyEvent;
 import org.eclipse.swt.events.ModifyListener;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.graphics.RGB;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Combo;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Event;
 import org.eclipse.swt.widgets.Group;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;

 /**
  * AbstractPreferencePage
  */
 public abstract class AbstractPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {
 	protected OverlayPreferenceStore fOverlayStore;

 	/**
 	 * Unique list of masters for control dependencies.
 	 * @see #createDependency(Button, String, Control)
 	 */
 	private Set<Button> fMasters = new LinkedHashSet<>();

 	protected Map<Object, String> fTextFields = new HashMap<>();
 	private ModifyListener fTextFieldListener = new ModifyListener() {
 		@Override
 		public void modifyText(ModifyEvent e) {
 			Text text = (Text) e.widget;
 			fOverlayStore.setValue(fTextFields.get(text), text.getText());
 		}
 	};

 	protected Map<Object, String> fComboBoxes = new HashMap<>();
 	private ModifyListener fComboBoxListener = new ModifyListener() {
 		@Override
 		public void modifyText(ModifyEvent e) {
 			Combo combo = (Combo) e.widget;
 			String state = ProposalFilterPreferencesUtil.comboStateAsString(combo);
 			fOverlayStore.setValue(fComboBoxes.get(combo), state);
 		}
 	};

 	protected Map<Object, String> fCheckBoxes = new HashMap<>();
 	private SelectionListener fCheckBoxListener = new SelectionListener() {
 		@Override
 		public void widgetDefaultSelected(SelectionEvent e) {
 		}

 		@Override
 		public void widgetSelected(SelectionEvent e) {
 			Button button = (Button) e.widget;
 			String value = (String) button.getData();
 			if (value == null) {
 				fOverlayStore.setValue(fCheckBoxes.get(button), button.getSelection());
 			} else if (button.getSelection()) {
 				fOverlayStore.setValue(fCheckBoxes.get(button), value);
 			}
 		}
 	};

 	protected ArrayList<Text> fNumberFields = new ArrayList<>();
 	private ModifyListener fNumberFieldListener = new ModifyListener() {
 		@Override
 		public void modifyText(ModifyEvent e) {
 			numberFieldChanged((Text) e.widget);
 		}
 	};

 	protected Map<Object, String> fColorButtons = new HashMap<>();
 	private SelectionListener fColorButtonListener = new SelectionListener() {
 		@Override
 		public void widgetDefaultSelected(SelectionEvent e) {
 		}

 		@Override
 		public void widgetSelected(SelectionEvent e) {
 			ColorSelector editor = (ColorSelector) e.widget.getData();
 			PreferenceConverter.setValue(fOverlayStore, fColorButtons.get(editor), editor.getColorValue());
 		}
 	};

 	protected static final int NO_TEXT_LIMIT = -1;

 	protected Button addRadioButton(Composite parent, String label, String key, int indentation) {
 		return addRadioButton(parent, label, key, null, indentation);
 	}

 	protected Button addRadioButton(Composite parent, String label, String key, String value, int indentation) {
 		Button radioButton = new Button(parent, SWT.RADIO);
 		radioButton.setText(label);
 		if (value != null)
 			radioButton.setData(value);

 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalIndent = indentation;
 		gd.horizontalSpan = 2;
 		radioButton.setLayoutData(gd);

 		if (key != null) {
 			radioButton.addSelectionListener(fCheckBoxListener);
 			fCheckBoxes.put(radioButton, key);
 		}

 		return radioButton;
 	}

 	protected Button addCheckBox(Composite parent, String label, String key, int indentation) {
 		Button checkBox = new Button(parent, SWT.CHECK);
 		checkBox.setText(label);

 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalIndent = indentation;
 		gd.horizontalSpan = 2;
 		checkBox.setLayoutData(gd);
 		checkBox.addSelectionListener(fCheckBoxListener);

 		fCheckBoxes.put(checkBox, key);

 		return checkBox;
 	}

 	protected Group addGroupBox(Composite parent, String label, int nColumns) {
 		Group group = new Group(parent, SWT.NONE);
 		group.setText(label);
 		GridLayout layout = new GridLayout();
 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = 2;
 		layout.numColumns = nColumns;
 		group.setLayout(layout);
 		group.setLayoutData(gd);
 		return group;
 	}

 	protected Control addTextField(Composite composite, String label, String key, int textLimit, int indentation,
 			boolean isNumber) {
 		Label labelControl = new Label(composite, SWT.NONE);
 		labelControl.setText(label);
 		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		gd.horizontalIndent = indentation;
 		labelControl.setLayoutData(gd);

 		Text textControl = new Text(composite, SWT.BORDER | SWT.SINGLE);
 		gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		gd.widthHint = convertWidthInCharsToPixels(textLimit + 1);
 		textControl.setLayoutData(gd);
 		textControl.setTextLimit(textLimit);
 		fTextFields.put(textControl, key);
 		if (isNumber) {
 			fNumberFields.add(textControl);
 			textControl.addModifyListener(fNumberFieldListener);
 		} else {
 			textControl.addModifyListener(fTextFieldListener);
 		}

 		return textControl;
 	}

 	protected void addComboBox(Composite composite, String label, String key, int textLimit, int indentation) {
 		Label labelControl = new Label(composite, SWT.NONE);
 		labelControl.setText(label);
 		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
 		gd.horizontalIndent = indentation;
 		labelControl.setLayoutData(gd);

 		Combo comboControl = new Combo(composite, SWT.BORDER | SWT.SINGLE | SWT.READ_ONLY); // TODO: When will the combo be disposed?
 		gd = new GridData(GridData.HORIZONTAL_ALIGN_END);
 		if (textLimit != NO_TEXT_LIMIT) {
 			gd.widthHint = convertWidthInCharsToPixels(textLimit + 1);
 			comboControl.setTextLimit(textLimit);
 		}
 		comboControl.setLayoutData(gd);
 		fComboBoxes.put(comboControl, key);
 		comboControl.addModifyListener(fComboBoxListener); // TODO: When will the listener be removed?
 	}

 	protected void addFiller(Composite composite) {
 		PixelConverter pixelConverter = new PixelConverter(composite);
 		Label filler = new Label(composite, SWT.LEFT);
 		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 		gd.horizontalSpan = 2;
 		gd.heightHint = pixelConverter.convertHeightInCharsToPixels(1) / 2;
 		filler.setLayoutData(gd);
 	}

 	protected void createDependency(final Button master, String masterKey, final Control slave) {
 		indent(slave);
 		boolean masterState = fOverlayStore.getBoolean(masterKey);
 		slave.setEnabled(masterState);
 		SelectionListener listener = new SelectionListener() {
 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				slave.setEnabled(master.getSelection());
 			}

 			@Override
 			public void widgetDefaultSelected(SelectionEvent e) {
 			}
 		};
 		master.addSelectionListener(listener);
 		fMasters.add(master);
 	}

 	protected void numberFieldChanged(Text textControl) {
 		String number = textControl.getText();
 		IStatus status = validatePositiveNumber(number);
 		if (!status.matches(IStatus.ERROR))
 			fOverlayStore.setValue(fTextFields.get(textControl), number);
 		updateStatus(status);
 	}

 	private IStatus validatePositiveNumber(String number) {
 		StatusInfo status = new StatusInfo();
 		if (number.length() == 0) {
 			status.setError(PreferencesMessages.CEditorPreferencePage_empty_input);
 		} else {
 			try {
 				int value = Integer.parseInt(number);
 				if (value < 0)
 					status.setError(NLS.bind(PreferencesMessages.CEditorPreferencePage_invalid_input, number));
 			} catch (NumberFormatException e) {
 				status.setError(NLS.bind(PreferencesMessages.CEditorPreferencePage_invalid_input, number));
 			}
 		}
 		return status;
 	}

 	protected void updateStatus(IStatus status) {
 		if (!status.matches(IStatus.ERROR)) {
 			for (int i = 0; i < fNumberFields.size(); i++) {
 				Text text = fNumberFields.get(i);
 				IStatus s = validatePositiveNumber(text.getText());
 				status = StatusUtil.getMoreSevere(s, status);
 			}
 		}
 		//status= StatusUtil.getMoreSevere(fCEditorHoverConfigurationBlock.getStatus(), status);
 		setValid(!status.matches(IStatus.ERROR));
 		StatusUtil.applyToStatusLine(this, status);
 	}

 	protected void indent(Control control) {
 		GridData gridData = new GridData();
 		gridData.horizontalIndent = 20;
 		control.setLayoutData(gridData);
 	}

 	protected Control addColorButton(Composite parent, String label, String key, int indentation) {
 		Composite composite = new Composite(parent, SWT.NONE);
 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalSpan = 2;
 		composite.setLayoutData(gd);

 		GridLayout layout = new GridLayout();
 		layout.numColumns = 2;
 		layout.marginWidth = 0;
 		layout.marginHeight = 0;
 		composite.setLayout(layout);

 		Label labelControl = new Label(composite, SWT.NONE);
 		labelControl.setText(label);

 		gd = new GridData(GridData.FILL_HORIZONTAL);
 		gd.horizontalIndent = indentation;
 		labelControl.setLayoutData(gd);

 		ColorSelector editor = new ColorSelector(composite);
 		Button button = editor.getButton();
 		button.setData(editor);

 		gd = new GridData();
 		gd.horizontalAlignment = GridData.END;
 		button.setLayoutData(gd);
 		button.addSelectionListener(fColorButtonListener);

 		fColorButtons.put(editor, key);

 		return composite;
 	}

 	public AbstractPreferencePage() {
 		super();
 		setPreferenceStore(PreferenceConstants.getPreferenceStore());
 		fOverlayStore = new OverlayPreferenceStore(getPreferenceStore(), createOverlayStoreKeys());
 	}

 	protected abstract OverlayPreferenceStore.OverlayKey[] createOverlayStoreKeys();

 	protected void initializeFields() {
 		Iterator<Object> e = fColorButtons.keySet().iterator();
 		while (e.hasNext()) {
 			ColorSelector c = (ColorSelector) e.next();
 			String key = fColorButtons.get(c);
 			RGB rgb = PreferenceConverter.getColor(fOverlayStore, key);
 			c.setColorValue(rgb);
 		}

 		e = fCheckBoxes.keySet().iterator();
 		while (e.hasNext()) {
 			Button b = (Button) e.next();
 			String key = fCheckBoxes.get(b);
 			String value = (String) b.getData();
 			if (value == null) {
 				b.setSelection(fOverlayStore.getBoolean(key));
 			} else if (value.equals(fOverlayStore.getString(key))) {
 				b.setSelection(true);
 			}
 		}

 		e = fTextFields.keySet().iterator();
 		while (e.hasNext()) {
 			Text t = (Text) e.next();
 			String key = fTextFields.get(t);
 			t.setText(fOverlayStore.getString(key));
 		}

 		e = fComboBoxes.keySet().iterator();
 		while (e.hasNext()) {
 			Combo c = (Combo) e.next();
 			String key = fComboBoxes.get(c);
 			String state = fOverlayStore.getString(key);
 			// Interpret the state string as a Combo state description
 			ProposalFilterPreferencesUtil.restoreComboFromString(c, state);
 		}

 		// Notify listeners for control dependencies.
 		Iterator<Button> buttonIter = fMasters.iterator();
 		while (buttonIter.hasNext()) {
 			Button b = buttonIter.next();
 			b.notifyListeners(SWT.Selection, new Event());
 		}
 	}

 	@Override
 	public void init(IWorkbench workbench) {
 	}

 	@Override
 	public boolean performOk() {
 		fOverlayStore.propagate();
 		return true;
 	}

 	@Override
 	protected void performDefaults() {
 		fOverlayStore.loadDefaults();
 		initializeFields();
 		super.performDefaults();
 	}

 	@Override
 	public void dispose() {
 		if (fOverlayStore != null) {
 			fOverlayStore.stop();
 			fOverlayStore = null;
 		}
 		super.dispose();
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2002, 2014 QNX Software Systems 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:
	* QNX Software Systems - Initial API and implementation
	* IBM Corporation
	* Anton Leherbauer (Wind River Systems)
	* Serge Beauchamp (Freescale Semiconductor) - Bug 418817
	* Sergey Prigogin (Google)
	*******************************************************************************/
	package org.eclipse.cdt.internal.ui.preferences;

	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.LinkedHashSet;
	import java.util.Map;
	import java.util.Set;

	import org.eclipse.cdt.internal.ui.dialogs.StatusInfo;
	import org.eclipse.cdt.internal.ui.dialogs.StatusUtil;
	import org.eclipse.cdt.ui.PreferenceConstants;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.jface.layout.PixelConverter;
	import org.eclipse.jface.preference.ColorSelector;
	import org.eclipse.jface.preference.PreferenceConverter;
	import org.eclipse.jface.preference.PreferencePage;
	import org.eclipse.osgi.util.NLS;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.ModifyEvent;
	import org.eclipse.swt.events.ModifyListener;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.graphics.RGB;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Combo;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Event;
	import org.eclipse.swt.widgets.Group;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.ui.IWorkbench;
	import org.eclipse.ui.IWorkbenchPreferencePage;

	/**
	* AbstractPreferencePage
	*/
	public abstract class AbstractPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {
	protected OverlayPreferenceStore fOverlayStore;

	/**
	* Unique list of masters for control dependencies.
	* @see #createDependency(Button, String, Control)
	*/
	private Set<Button> fMasters = new LinkedHashSet<>();

	protected Map<Object, String> fTextFields = new HashMap<>();
	private ModifyListener fTextFieldListener = new ModifyListener() {
	@Override
	public void modifyText(ModifyEvent e) {
	Text text = (Text) e.widget;
	fOverlayStore.setValue(fTextFields.get(text), text.getText());
	}
	};

	protected Map<Object, String> fComboBoxes = new HashMap<>();
	private ModifyListener fComboBoxListener = new ModifyListener() {
	@Override
	public void modifyText(ModifyEvent e) {
	Combo combo = (Combo) e.widget;
	String state = ProposalFilterPreferencesUtil.comboStateAsString(combo);
	fOverlayStore.setValue(fComboBoxes.get(combo), state);
	}
	};

	protected Map<Object, String> fCheckBoxes = new HashMap<>();
	private SelectionListener fCheckBoxListener = new SelectionListener() {
	@Override
	public void widgetDefaultSelected(SelectionEvent e) {
	}

	@Override
	public void widgetSelected(SelectionEvent e) {
	Button button = (Button) e.widget;
	String value = (String) button.getData();
	if (value == null) {
	fOverlayStore.setValue(fCheckBoxes.get(button), button.getSelection());
	} else if (button.getSelection()) {
	fOverlayStore.setValue(fCheckBoxes.get(button), value);
	}
	}
	};

	protected ArrayList<Text> fNumberFields = new ArrayList<>();
	private ModifyListener fNumberFieldListener = new ModifyListener() {
	@Override
	public void modifyText(ModifyEvent e) {
	numberFieldChanged((Text) e.widget);
	}
	};

	protected Map<Object, String> fColorButtons = new HashMap<>();
	private SelectionListener fColorButtonListener = new SelectionListener() {
	@Override
	public void widgetDefaultSelected(SelectionEvent e) {
	}

	@Override
	public void widgetSelected(SelectionEvent e) {
	ColorSelector editor = (ColorSelector) e.widget.getData();
	PreferenceConverter.setValue(fOverlayStore, fColorButtons.get(editor), editor.getColorValue());
	}
	};

	protected static final int NO_TEXT_LIMIT = -1;

	protected Button addRadioButton(Composite parent, String label, String key, int indentation) {
	return addRadioButton(parent, label, key, null, indentation);
	}

	protected Button addRadioButton(Composite parent, String label, String key, String value, int indentation) {
	Button radioButton = new Button(parent, SWT.RADIO);
	radioButton.setText(label);
	if (value != null)
	radioButton.setData(value);

	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalIndent = indentation;
	gd.horizontalSpan = 2;
	radioButton.setLayoutData(gd);

	if (key != null) {
	radioButton.addSelectionListener(fCheckBoxListener);
	fCheckBoxes.put(radioButton, key);
	}

	return radioButton;
	}

	protected Button addCheckBox(Composite parent, String label, String key, int indentation) {
	Button checkBox = new Button(parent, SWT.CHECK);
	checkBox.setText(label);

	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalIndent = indentation;
	gd.horizontalSpan = 2;
	checkBox.setLayoutData(gd);
	checkBox.addSelectionListener(fCheckBoxListener);

	fCheckBoxes.put(checkBox, key);

	return checkBox;
	}

	protected Group addGroupBox(Composite parent, String label, int nColumns) {
	Group group = new Group(parent, SWT.NONE);
	group.setText(label);
	GridLayout layout = new GridLayout();
	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 2;
	layout.numColumns = nColumns;
	group.setLayout(layout);
	group.setLayoutData(gd);
	return group;
	}

	protected Control addTextField(Composite composite, String label, String key, int textLimit, int indentation,
	boolean isNumber) {
	Label labelControl = new Label(composite, SWT.NONE);
	labelControl.setText(label);
	GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	gd.horizontalIndent = indentation;
	labelControl.setLayoutData(gd);

	Text textControl = new Text(composite, SWT.BORDER \| SWT.SINGLE);
	gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	gd.widthHint = convertWidthInCharsToPixels(textLimit + 1);
	textControl.setLayoutData(gd);
	textControl.setTextLimit(textLimit);
	fTextFields.put(textControl, key);
	if (isNumber) {
	fNumberFields.add(textControl);
	textControl.addModifyListener(fNumberFieldListener);
	} else {
	textControl.addModifyListener(fTextFieldListener);
	}

	return textControl;
	}

	protected void addComboBox(Composite composite, String label, String key, int textLimit, int indentation) {
	Label labelControl = new Label(composite, SWT.NONE);
	labelControl.setText(label);
	GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
	gd.horizontalIndent = indentation;
	labelControl.setLayoutData(gd);

	Combo comboControl = new Combo(composite, SWT.BORDER \| SWT.SINGLE \| SWT.READ_ONLY); // TODO: When will the combo be disposed?
	gd = new GridData(GridData.HORIZONTAL_ALIGN_END);
	if (textLimit != NO_TEXT_LIMIT) {
	gd.widthHint = convertWidthInCharsToPixels(textLimit + 1);
	comboControl.setTextLimit(textLimit);
	}
	comboControl.setLayoutData(gd);
	fComboBoxes.put(comboControl, key);
	comboControl.addModifyListener(fComboBoxListener); // TODO: When will the listener be removed?
	}

	protected void addFiller(Composite composite) {
	PixelConverter pixelConverter = new PixelConverter(composite);
	Label filler = new Label(composite, SWT.LEFT);
	GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
	gd.horizontalSpan = 2;
	gd.heightHint = pixelConverter.convertHeightInCharsToPixels(1) / 2;
	filler.setLayoutData(gd);
	}

	protected void createDependency(final Button master, String masterKey, final Control slave) {
	indent(slave);
	boolean masterState = fOverlayStore.getBoolean(masterKey);
	slave.setEnabled(masterState);
	SelectionListener listener = new SelectionListener() {
	@Override
	public void widgetSelected(SelectionEvent e) {
	slave.setEnabled(master.getSelection());
	}

	@Override
	public void widgetDefaultSelected(SelectionEvent e) {
	}
	};
	master.addSelectionListener(listener);
	fMasters.add(master);
	}

	protected void numberFieldChanged(Text textControl) {
	String number = textControl.getText();
	IStatus status = validatePositiveNumber(number);
	if (!status.matches(IStatus.ERROR))
	fOverlayStore.setValue(fTextFields.get(textControl), number);
	updateStatus(status);
	}

	private IStatus validatePositiveNumber(String number) {
	StatusInfo status = new StatusInfo();
	if (number.length() == 0) {
	status.setError(PreferencesMessages.CEditorPreferencePage_empty_input);
	} else {
	try {
	int value = Integer.parseInt(number);
	if (value < 0)
	status.setError(NLS.bind(PreferencesMessages.CEditorPreferencePage_invalid_input, number));
	} catch (NumberFormatException e) {
	status.setError(NLS.bind(PreferencesMessages.CEditorPreferencePage_invalid_input, number));
	}
	}
	return status;
	}

	protected void updateStatus(IStatus status) {
	if (!status.matches(IStatus.ERROR)) {
	for (int i = 0; i < fNumberFields.size(); i++) {
	Text text = fNumberFields.get(i);
	IStatus s = validatePositiveNumber(text.getText());
	status = StatusUtil.getMoreSevere(s, status);
	}
	}
	//status= StatusUtil.getMoreSevere(fCEditorHoverConfigurationBlock.getStatus(), status);
	setValid(!status.matches(IStatus.ERROR));
	StatusUtil.applyToStatusLine(this, status);
	}

	protected void indent(Control control) {
	GridData gridData = new GridData();
	gridData.horizontalIndent = 20;
	control.setLayoutData(gridData);
	}

	protected Control addColorButton(Composite parent, String label, String key, int indentation) {
	Composite composite = new Composite(parent, SWT.NONE);
	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalSpan = 2;
	composite.setLayoutData(gd);

	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	composite.setLayout(layout);

	Label labelControl = new Label(composite, SWT.NONE);
	labelControl.setText(label);

	gd = new GridData(GridData.FILL_HORIZONTAL);
	gd.horizontalIndent = indentation;
	labelControl.setLayoutData(gd);

	ColorSelector editor = new ColorSelector(composite);
	Button button = editor.getButton();
	button.setData(editor);

	gd = new GridData();
	gd.horizontalAlignment = GridData.END;
	button.setLayoutData(gd);
	button.addSelectionListener(fColorButtonListener);

	fColorButtons.put(editor, key);

	return composite;
	}

	public AbstractPreferencePage() {
	super();
	setPreferenceStore(PreferenceConstants.getPreferenceStore());
	fOverlayStore = new OverlayPreferenceStore(getPreferenceStore(), createOverlayStoreKeys());
	}

	protected abstract OverlayPreferenceStore.OverlayKey[] createOverlayStoreKeys();

	protected void initializeFields() {
	Iterator<Object> e = fColorButtons.keySet().iterator();
	while (e.hasNext()) {
	ColorSelector c = (ColorSelector) e.next();
	String key = fColorButtons.get(c);
	RGB rgb = PreferenceConverter.getColor(fOverlayStore, key);
	c.setColorValue(rgb);
	}

	e = fCheckBoxes.keySet().iterator();
	while (e.hasNext()) {
	Button b = (Button) e.next();
	String key = fCheckBoxes.get(b);
	String value = (String) b.getData();
	if (value == null) {
	b.setSelection(fOverlayStore.getBoolean(key));
	} else if (value.equals(fOverlayStore.getString(key))) {
	b.setSelection(true);
	}
	}

	e = fTextFields.keySet().iterator();
	while (e.hasNext()) {
	Text t = (Text) e.next();
	String key = fTextFields.get(t);
	t.setText(fOverlayStore.getString(key));
	}

	e = fComboBoxes.keySet().iterator();
	while (e.hasNext()) {
	Combo c = (Combo) e.next();
	String key = fComboBoxes.get(c);
	String state = fOverlayStore.getString(key);
	// Interpret the state string as a Combo state description
	ProposalFilterPreferencesUtil.restoreComboFromString(c, state);
	}

	// Notify listeners for control dependencies.
	Iterator<Button> buttonIter = fMasters.iterator();
	while (buttonIter.hasNext()) {
	Button b = buttonIter.next();
	b.notifyListeners(SWT.Selection, new Event());
	}
	}

	@Override
	public void init(IWorkbench workbench) {
	}

	@Override
	public boolean performOk() {
	fOverlayStore.propagate();
	return true;
	}

	@Override
	protected void performDefaults() {
	fOverlayStore.loadDefaults();
	initializeFields();
	super.performDefaults();
	}

	@Override
	public void dispose() {
	if (fOverlayStore != null) {
	fOverlayStore.stop();
	fOverlayStore = null;
	}
	super.dispose();
	}
	}