org.eclipse.gmf.runtime.diagram.ui.properties/src/org/eclipse/gmf/runtime/diagram/ui/properties/sections/appearance/ColorPalettePopup.java - gmf-runtime/org.eclipse.gmf-runtime - Git at Google

 /******************************************************************************
  * Copyright (c) 2005, 2008 IBM Corporation 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:
  *    IBM Corporation - initial API and implementation
  ****************************************************************************/
 package org.eclipse.gmf.runtime.diagram.ui.properties.sections.appearance;

 import java.util.HashMap;
 import java.util.Iterator;

 import org.eclipse.gmf.runtime.common.ui.util.WindowUtil;
 import org.eclipse.gmf.runtime.diagram.ui.properties.internal.l10n.DiagramUIPropertiesMessages;
 import org.eclipse.gmf.runtime.draw2d.ui.figures.FigureUtilities;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.SWTException;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.graphics.Device;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.graphics.ImageData;
 import org.eclipse.swt.graphics.PaletteData;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.RGB;
 import org.eclipse.swt.layout.FillLayout;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.ColorDialog;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Event;
 import org.eclipse.swt.widgets.Listener;
 import org.eclipse.swt.widgets.Shell;

 public class ColorPalettePopup {

 	/** variable to store previous color */
 	private int previousColor;
 	private Button customColorButton;
 	private HashMap buttonMap = new HashMap();

 	/**
 	 * A descirptor for an inventory color
 	 */
 	private static class InventoryColorDescriptor
 		extends ImageDescriptor {

 		/** the default preference color */
 		private static final RGB OUTLINE_COLOR = new RGB(192, 192, 192);

 		public RGB rgb;

 		public InventoryColorDescriptor(RGB colorValue) {
 			this.rgb = colorValue;

 		}

 		/**
 		 * @see org.eclipse.jface.resource.ImageDescriptor#getImageData()
 		 */
 		public ImageData getImageData() {
 			ImageData data = new ImageData(ICON_SIZE.x, ICON_SIZE.y, 1,
 				new PaletteData(new RGB[] {rgb, OUTLINE_COLOR}));

 			for (int i = 0; i < ICON_SIZE.y; i++)
 				data.setPixel(0, i, 1);
 			for (int i = 0; i < ICON_SIZE.y; i++)
 				data.setPixel(ICON_SIZE.x - 1, i, 1);
 			for (int i = 0; i < ICON_SIZE.x; i++)
 				data.setPixel(i, 0, 1);
 			for (int i = 0; i < ICON_SIZE.x; i++)
 				data.setPixel(i, ICON_SIZE.y - 1, 1);
 			return data;
 		}

 		/**
 		 * Creates and returns a new SWT image for this image descriptor. The
 		 * returned image must be explicitly disposed using the image's dispose
 		 * call. The image will not be automatically garbage collected. In the
 		 * even of an error, a default image is returned if
 		 * <code>returnMissingImageOnError</code> is true, otherwise
 		 * <code>null</code> is returned.
 		 * <p>
 		 * Note: Even if <code>returnMissingImageOnError</code> is true, it is
 		 * still possible for this method to return <code>null</code> in
 		 * extreme cases, for example if SWT runs out of image handles.
 		 * </p>
 		 *
 		 * @return a new image or <code>null</code> if the image could not be
 		 *         created
 		 *
 		 */
 		public Image createImage() {

 			Device device = Display.getCurrent();
 			ImageData data = getImageData();
 			if (data == null)
 				data = DEFAULT_IMAGE_DATA;

 			/*
 			 * Try to create the supplied image. If there is an SWT Exception
 			 * try and create the default image if that was requested. Return
 			 * null if this fails.
 			 */

 			try {
 				if (data.transparentPixel >= 0) {
 					ImageData maskData = data.getTransparencyMask();
 					return new Image(device, data, maskData);
 				}
 				return new Image(device, data);
 			} catch (SWTException exception) {

 				try {
 					return new Image(device, DEFAULT_IMAGE_DATA);
 				} catch (SWTException nextException) {
 					return null;
 				}

 			}
 		}
 	}

 	/** default color icon width */
 	public static final Point ICON_SIZE = new Point(IDialogConstants.BUTTON_BAR_HEIGHT,
 			IDialogConstants.BUTTON_BAR_HEIGHT);

 	/** inventory colors */
 	private static final InventoryColorDescriptor WHITE = new InventoryColorDescriptor(
 		new RGB(255, 255, 255));

 	private static final InventoryColorDescriptor BLACK = new InventoryColorDescriptor(
 		new RGB(0, 0, 0));

 	private static final InventoryColorDescriptor LIGHT_GRAY = new InventoryColorDescriptor(
 		new RGB(192, 192, 192));

 	private static final InventoryColorDescriptor GRAY = new InventoryColorDescriptor(
 		new RGB(128, 128, 128));

 	private static final InventoryColorDescriptor RED = new InventoryColorDescriptor(
 		new RGB(227, 164, 156));

 	private static final InventoryColorDescriptor GREEN = new InventoryColorDescriptor(
 		new RGB(166, 193, 152));

 	private static final InventoryColorDescriptor BLUE = new InventoryColorDescriptor(
 		new RGB(152, 168, 191));

 	private static final InventoryColorDescriptor YELLOW = new InventoryColorDescriptor(
 		new RGB(225, 225, 135));

 	private static final InventoryColorDescriptor PURPLE = new InventoryColorDescriptor(
 		new RGB(184, 151, 192));

 	private static final InventoryColorDescriptor TEAL = new InventoryColorDescriptor(
 		new RGB(155, 199, 204));

 	private static final InventoryColorDescriptor PINK = new InventoryColorDescriptor(
 		new RGB(228, 179, 229));

 	private static final InventoryColorDescriptor ORANGE = new InventoryColorDescriptor(
 		new RGB(237, 201, 122));

 	/** the inventory color list key: anRGB, value: anImage */
 	private static final HashMap imageColorMap = new HashMap();

 	private static final String DEAFULT_COLOR_STRING = DiagramUIPropertiesMessages.ColorPalettePopup_default;

 	private static final String CUSTOM_COLOR_STRING = DiagramUIPropertiesMessages.ColorPalettePopup_custom;

 	static {

 		// inventory colors
 		imageColorMap.put(WHITE.rgb, WHITE.createImage());
 		imageColorMap.put(BLACK.rgb, BLACK.createImage());
 		imageColorMap.put(LIGHT_GRAY.rgb, LIGHT_GRAY.createImage());
 		imageColorMap.put(GRAY.rgb, GRAY.createImage());
 		imageColorMap.put(RED.rgb, RED.createImage());
 		imageColorMap.put(GREEN.rgb, GREEN.createImage());
 		imageColorMap.put(BLUE.rgb, BLUE.createImage());
 		imageColorMap.put(YELLOW.rgb, YELLOW.createImage());
 		imageColorMap.put(PURPLE.rgb, PURPLE.createImage());
 		imageColorMap.put(TEAL.rgb, TEAL.createImage());
 		imageColorMap.put(PINK.rgb, PINK.createImage());
 		imageColorMap.put(ORANGE.rgb, ORANGE.createImage());
 	}

 	private Shell shell;

 	private RGB selectedColor = null;

     /**
      * The default color to be used if the user presses the default button.
      */
     private boolean useDefaultColor = false;

 	/**
      * Creates a color palette popup above the specified shell.
      *
      * @param parent
      *            a Shell control which will be the parent of the new instance
      *            (cannot be null)
      * @deprecated Use the other constructor. This one does not retrieve the
      *             default value from the correct preference store.
      */
     public ColorPalettePopup(Shell parent, String preferenceId, int rowHeight) {
         this(parent, rowHeight);
     }

 	/**
 	 * Creates a PopupList above the specified shell.
 	 *
 	 * @param parent
 	 *            a widget which will be the parent of the new instance (cannot
 	 *            be null)
 	 * @param style
 	 *            the style of widget to construct
 	 */
 	public ColorPalettePopup(Shell parent, int rowHeight) {
 		shell = new Shell(parent, checkStyle(SWT.NONE));
 		shell.setLayout(new FillLayout());
 		GridLayout layout = new GridLayout(4, true);
 		shell.setLayout(layout);

 		for (Iterator e = imageColorMap.keySet().iterator(); e.hasNext();) {
 			Button button = new Button(shell, SWT.PUSH | SWT.FLAT);
 			GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 			data.heightHint = rowHeight;
 			data.widthHint = rowHeight;
 			button.setLayoutData(data);

 			final RGB rgb = (RGB) e.next();
 			final Image image = (Image) imageColorMap.get(rgb);
 			button.setImage(image);
 			button.addSelectionListener(new SelectionAdapter() {

 				public void widgetSelected(SelectionEvent e1) {
 					selectedColor = rgb;
 					shell.dispose();
 				}
 			});
 			buttonMap.put(rgb , button);
 		}
 		Button defaultButton = new Button(shell, SWT.PUSH | SWT.FLAT);
 		defaultButton.setText(DEAFULT_COLOR_STRING);
 		GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 		data.horizontalSpan = 4;
 		defaultButton.setLayoutData(data);

 		defaultButton.addSelectionListener(new SelectionAdapter() {

             public void widgetSelected(SelectionEvent event) {
                 useDefaultColor = true;
                 shell.dispose();
             }
         });

 		Button moreColors = new Button(shell, SWT.PUSH | SWT.FLAT);
 		moreColors.setText(CUSTOM_COLOR_STRING);
 		data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 		data.horizontalSpan = 4;
 		moreColors.setLayoutData(data);

 		moreColors.addSelectionListener(new SelectionAdapter() {

 			public void widgetSelected(SelectionEvent event) {

 				ColorDialog dialog = new ColorDialog(Display.getCurrent()
 					.getActiveShell());
 				dialog.setRGB(FigureUtilities.integerToRGB(getPreviousColor()));
 				WindowUtil.centerDialog(dialog.getParent(), Display
 					.getCurrent().getActiveShell());
 				dialog.open();
 				selectedColor = dialog.getRGB();
 				shell.dispose();

 			}
 		});
 		// close dialog if user selects outside of the shell
 		shell.addListener(SWT.Deactivate, new Listener() {

 			public void handleEvent(Event e) {
 				shell.setVisible(false);
 			}
 		});
 		customColorButton = moreColors;

 	}

 	/**
 	 * @param style
 	 * @return
 	 */
 	private static int checkStyle(int style) {
 		int mask = SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
 		return style & mask;
 	}

 	/**
 	 * Launches the Popup List, waits for an item to be selected and then closes
 	 * PopupList.
 	 *
 	 * @param rect
 	 *            the initial size and location of the PopupList; the dialog
 	 *            will be positioned so that it does not run off the screen and
 	 *            the largest number of items are visible
 	 *
 	 * @return the text of the selected item or null if no item is selected
 	 */
 	public RGB open(Point location) {

 		Point listSize = shell.computeSize(SWT.DEFAULT, SWT.DEFAULT, false);
 		shell.setBounds(location.x, location.y, listSize.x, listSize.y);

 		shell.open();
 		shell.setFocus();
 		Display display = shell.getDisplay();
 		Button prevButton = (Button)buttonMap.get(FigureUtilities.integerToRGB(getPreviousColor()));
 		if (prevButton != null){
 			shell.setDefaultButton(prevButton);
 		}
 		else{
 			shell.setDefaultButton(customColorButton);
 		}
 		while (!shell.isDisposed() && shell.isVisible()) {
 			if (!display.readAndDispatch())
 				display.sleep();
 		}
 		return getSelectedColor();
 	}

 	/**
      * Gets the color the user selected. Could be null as the user may have
      * cancelled the gesture or they may have selected the default color button.
      * See {@link #useDefaultColor()}.
      *
      * @return the selected color or null
      */
     public RGB getSelectedColor() {
         return selectedColor;
     }

     /**
      * Returns true if the user selected to use the default color
      *
      * @return true if the default color is to be used; false otherwise
      */
     public boolean useDefaultColor() {
         return useDefaultColor;
     }

 	public int getPreviousColor() {
 		return previousColor;
 	}

 	public void setPreviousColor(int previousColor) {
 		this.previousColor = previousColor;
 	}
 }
	/******************************************************************************
	* Copyright (c) 2005, 2008 IBM Corporation 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:
	* IBM Corporation - initial API and implementation
	****************************************************************************/
	package org.eclipse.gmf.runtime.diagram.ui.properties.sections.appearance;

	import java.util.HashMap;
	import java.util.Iterator;

	import org.eclipse.gmf.runtime.common.ui.util.WindowUtil;
	import org.eclipse.gmf.runtime.diagram.ui.properties.internal.l10n.DiagramUIPropertiesMessages;
	import org.eclipse.gmf.runtime.draw2d.ui.figures.FigureUtilities;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.resource.ImageDescriptor;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.SWTException;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.graphics.Device;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.graphics.ImageData;
	import org.eclipse.swt.graphics.PaletteData;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.graphics.RGB;
	import org.eclipse.swt.layout.FillLayout;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.ColorDialog;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Event;
	import org.eclipse.swt.widgets.Listener;
	import org.eclipse.swt.widgets.Shell;

	public class ColorPalettePopup {

	/** variable to store previous color */
	private int previousColor;
	private Button customColorButton;
	private HashMap buttonMap = new HashMap();

	/**
	* A descirptor for an inventory color
	*/
	private static class InventoryColorDescriptor
	extends ImageDescriptor {

	/** the default preference color */
	private static final RGB OUTLINE_COLOR = new RGB(192, 192, 192);

	public RGB rgb;

	public InventoryColorDescriptor(RGB colorValue) {
	this.rgb = colorValue;

	}

	/**
	* @see org.eclipse.jface.resource.ImageDescriptor#getImageData()
	*/
	public ImageData getImageData() {
	ImageData data = new ImageData(ICON_SIZE.x, ICON_SIZE.y, 1,
	new PaletteData(new RGB[] {rgb, OUTLINE_COLOR}));

	for (int i = 0; i < ICON_SIZE.y; i++)
	data.setPixel(0, i, 1);
	for (int i = 0; i < ICON_SIZE.y; i++)
	data.setPixel(ICON_SIZE.x - 1, i, 1);
	for (int i = 0; i < ICON_SIZE.x; i++)
	data.setPixel(i, 0, 1);
	for (int i = 0; i < ICON_SIZE.x; i++)
	data.setPixel(i, ICON_SIZE.y - 1, 1);
	return data;
	}

	/**
	* Creates and returns a new SWT image for this image descriptor. The
	* returned image must be explicitly disposed using the image's dispose
	* call. The image will not be automatically garbage collected. In the
	* even of an error, a default image is returned if
	* <code>returnMissingImageOnError</code> is true, otherwise
	* <code>null</code> is returned.
	* <p>
	* Note: Even if <code>returnMissingImageOnError</code> is true, it is
	* still possible for this method to return <code>null</code> in
	* extreme cases, for example if SWT runs out of image handles.
	* </p>
	*
	* @return a new image or <code>null</code> if the image could not be
	* created
	*
	*/
	public Image createImage() {

	Device device = Display.getCurrent();
	ImageData data = getImageData();
	if (data == null)
	data = DEFAULT_IMAGE_DATA;

	/*
	* Try to create the supplied image. If there is an SWT Exception
	* try and create the default image if that was requested. Return
	* null if this fails.
	*/

	try {
	if (data.transparentPixel >= 0) {
	ImageData maskData = data.getTransparencyMask();
	return new Image(device, data, maskData);
	}
	return new Image(device, data);
	} catch (SWTException exception) {

	try {
	return new Image(device, DEFAULT_IMAGE_DATA);
	} catch (SWTException nextException) {
	return null;
	}

	}
	}
	}

	/** default color icon width */
	public static final Point ICON_SIZE = new Point(IDialogConstants.BUTTON_BAR_HEIGHT,
	IDialogConstants.BUTTON_BAR_HEIGHT);

	/** inventory colors */
	private static final InventoryColorDescriptor WHITE = new InventoryColorDescriptor(
	new RGB(255, 255, 255));

	private static final InventoryColorDescriptor BLACK = new InventoryColorDescriptor(
	new RGB(0, 0, 0));

	private static final InventoryColorDescriptor LIGHT_GRAY = new InventoryColorDescriptor(
	new RGB(192, 192, 192));

	private static final InventoryColorDescriptor GRAY = new InventoryColorDescriptor(
	new RGB(128, 128, 128));

	private static final InventoryColorDescriptor RED = new InventoryColorDescriptor(
	new RGB(227, 164, 156));

	private static final InventoryColorDescriptor GREEN = new InventoryColorDescriptor(
	new RGB(166, 193, 152));

	private static final InventoryColorDescriptor BLUE = new InventoryColorDescriptor(
	new RGB(152, 168, 191));

	private static final InventoryColorDescriptor YELLOW = new InventoryColorDescriptor(
	new RGB(225, 225, 135));

	private static final InventoryColorDescriptor PURPLE = new InventoryColorDescriptor(
	new RGB(184, 151, 192));

	private static final InventoryColorDescriptor TEAL = new InventoryColorDescriptor(
	new RGB(155, 199, 204));

	private static final InventoryColorDescriptor PINK = new InventoryColorDescriptor(
	new RGB(228, 179, 229));

	private static final InventoryColorDescriptor ORANGE = new InventoryColorDescriptor(
	new RGB(237, 201, 122));

	/** the inventory color list key: anRGB, value: anImage */
	private static final HashMap imageColorMap = new HashMap();

	private static final String DEAFULT_COLOR_STRING = DiagramUIPropertiesMessages.ColorPalettePopup_default;

	private static final String CUSTOM_COLOR_STRING = DiagramUIPropertiesMessages.ColorPalettePopup_custom;

	static {

	// inventory colors
	imageColorMap.put(WHITE.rgb, WHITE.createImage());
	imageColorMap.put(BLACK.rgb, BLACK.createImage());
	imageColorMap.put(LIGHT_GRAY.rgb, LIGHT_GRAY.createImage());
	imageColorMap.put(GRAY.rgb, GRAY.createImage());
	imageColorMap.put(RED.rgb, RED.createImage());
	imageColorMap.put(GREEN.rgb, GREEN.createImage());
	imageColorMap.put(BLUE.rgb, BLUE.createImage());
	imageColorMap.put(YELLOW.rgb, YELLOW.createImage());
	imageColorMap.put(PURPLE.rgb, PURPLE.createImage());
	imageColorMap.put(TEAL.rgb, TEAL.createImage());
	imageColorMap.put(PINK.rgb, PINK.createImage());
	imageColorMap.put(ORANGE.rgb, ORANGE.createImage());
	}

	private Shell shell;

	private RGB selectedColor = null;

	/**
	* The default color to be used if the user presses the default button.
	*/
	private boolean useDefaultColor = false;

	/**
	* Creates a color palette popup above the specified shell.
	*
	* @param parent
	* a Shell control which will be the parent of the new instance
	* (cannot be null)
	* @deprecated Use the other constructor. This one does not retrieve the
	* default value from the correct preference store.
	*/
	public ColorPalettePopup(Shell parent, String preferenceId, int rowHeight) {
	this(parent, rowHeight);
	}

	/**
	* Creates a PopupList above the specified shell.
	*
	* @param parent
	* a widget which will be the parent of the new instance (cannot
	* be null)
	* @param style
	* the style of widget to construct
	*/
	public ColorPalettePopup(Shell parent, int rowHeight) {
	shell = new Shell(parent, checkStyle(SWT.NONE));
	shell.setLayout(new FillLayout());
	GridLayout layout = new GridLayout(4, true);
	shell.setLayout(layout);

	for (Iterator e = imageColorMap.keySet().iterator(); e.hasNext();) {
	Button button = new Button(shell, SWT.PUSH \| SWT.FLAT);
	GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
	data.heightHint = rowHeight;
	data.widthHint = rowHeight;
	button.setLayoutData(data);

	final RGB rgb = (RGB) e.next();
	final Image image = (Image) imageColorMap.get(rgb);
	button.setImage(image);
	button.addSelectionListener(new SelectionAdapter() {

	public void widgetSelected(SelectionEvent e1) {
	selectedColor = rgb;
	shell.dispose();
	}
	});
	buttonMap.put(rgb , button);
	}
	Button defaultButton = new Button(shell, SWT.PUSH \| SWT.FLAT);
	defaultButton.setText(DEAFULT_COLOR_STRING);
	GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
	data.horizontalSpan = 4;
	defaultButton.setLayoutData(data);

	defaultButton.addSelectionListener(new SelectionAdapter() {

	public void widgetSelected(SelectionEvent event) {
	useDefaultColor = true;
	shell.dispose();
	}
	});

	Button moreColors = new Button(shell, SWT.PUSH \| SWT.FLAT);
	moreColors.setText(CUSTOM_COLOR_STRING);
	data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
	data.horizontalSpan = 4;
	moreColors.setLayoutData(data);

	moreColors.addSelectionListener(new SelectionAdapter() {

	public void widgetSelected(SelectionEvent event) {

	ColorDialog dialog = new ColorDialog(Display.getCurrent()
	.getActiveShell());
	dialog.setRGB(FigureUtilities.integerToRGB(getPreviousColor()));
	WindowUtil.centerDialog(dialog.getParent(), Display
	.getCurrent().getActiveShell());
	dialog.open();
	selectedColor = dialog.getRGB();
	shell.dispose();

	}
	});
	// close dialog if user selects outside of the shell
	shell.addListener(SWT.Deactivate, new Listener() {

	public void handleEvent(Event e) {
	shell.setVisible(false);
	}
	});
	customColorButton = moreColors;

	}

	/**
	* @param style
	* @return
	*/
	private static int checkStyle(int style) {
	int mask = SWT.LEFT_TO_RIGHT \| SWT.RIGHT_TO_LEFT;
	return style & mask;
	}

	/**
	* Launches the Popup List, waits for an item to be selected and then closes
	* PopupList.
	*
	* @param rect
	* the initial size and location of the PopupList; the dialog
	* will be positioned so that it does not run off the screen and
	* the largest number of items are visible
	*
	* @return the text of the selected item or null if no item is selected
	*/
	public RGB open(Point location) {

	Point listSize = shell.computeSize(SWT.DEFAULT, SWT.DEFAULT, false);
	shell.setBounds(location.x, location.y, listSize.x, listSize.y);

	shell.open();
	shell.setFocus();
	Display display = shell.getDisplay();
	Button prevButton = (Button)buttonMap.get(FigureUtilities.integerToRGB(getPreviousColor()));
	if (prevButton != null){
	shell.setDefaultButton(prevButton);
	}
	else{
	shell.setDefaultButton(customColorButton);
	}
	while (!shell.isDisposed() && shell.isVisible()) {
	if (!display.readAndDispatch())
	display.sleep();
	}
	return getSelectedColor();
	}

	/**
	* Gets the color the user selected. Could be null as the user may have
	* cancelled the gesture or they may have selected the default color button.
	* See {@link #useDefaultColor()}.
	*
	* @return the selected color or null
	*/
	public RGB getSelectedColor() {
	return selectedColor;
	}

	/**
	* Returns true if the user selected to use the default color
	*
	* @return true if the default color is to be used; false otherwise
	*/
	public boolean useDefaultColor() {
	return useDefaultColor;
	}

	public int getPreviousColor() {
	return previousColor;
	}

	public void setPreviousColor(int previousColor) {
	this.previousColor = previousColor;
	}
	}