org.eclipse.xwt.tools.ui.designer/src/org/eclipse/xwt/tools/ui/designer/dialogs/ColorChooser.java - xwt/org.eclipse.xwt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2006, 2010 Soyatec (http://www.soyatec.com) 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:
  *     Soyatec - initial API and implementation
  *******************************************************************************/
 package org.eclipse.xwt.tools.ui.designer.dialogs;

 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;

 import org.eclipse.core.databinding.conversion.IConverter;
 import org.eclipse.xwt.XWT;
 import org.eclipse.xwt.XWTMaps;
 import org.eclipse.xwt.utils.NamedColorsUtil;
 import org.eclipse.xwt.utils.ResourceManager;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CLabel;
 import org.eclipse.swt.custom.ScrolledComposite;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.GC;
 import org.eclipse.swt.graphics.Image;
 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.Canvas;
 import org.eclipse.swt.widgets.ColorDialog;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Event;
 import org.eclipse.swt.widgets.Group;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Listener;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.TabFolder;
 import org.eclipse.swt.widgets.TabItem;
 import org.eclipse.swt.widgets.Text;

 /**
  * @author jliu (jin.liu@soyatec.com)
  */
 public class ColorChooser extends Dialog {
 	private Canvas previewCanvas;
 	private Text redText;
 	private Text greenText;
 	private Text blueText;
 	private Text resultText;

 	private Object initValue;
 	private Map<Object, Color> colorsMap = new HashMap<Object, Color>();

 	private String result;

 	private static final Color BACKGROUND = Display.getDefault().getSystemColor(SWT.COLOR_WHITE);
 	private Control selection;

 	public ColorChooser(Shell parent, Object initValue) {
 		super(parent);
 		this.initValue = initValue;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets.Shell)
 	 */
 	protected void configureShell(Shell newShell) {
 		super.configureShell(newShell);
 		newShell.setText("Color Chooser");
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
 	 */
 	protected Control createDialogArea(Composite parent) {
 		Composite dialogArea = (Composite) super.createDialogArea(parent);
 		dialogArea.setLayout(new GridLayout(1, true));

 		createPreviewGrp(dialogArea);

 		createColorGrp(dialogArea);
 		if (initValue != null) {
 			if (initValue instanceof String) {
 				preview((String) initValue);
 			} else if (initValue instanceof Color) {
 				preview((Color) initValue);
 			}
 		}

 		return dialogArea;
 	}

 	private void createColorGrp(Composite dialogArea) {
 		Group colorGrp = new Group(dialogArea, SWT.NONE);
 		colorGrp.setText("Color");
 		colorGrp.setLayout(new GridLayout());
 		colorGrp.setLayoutData(new GridData(GridData.FILL_BOTH));

 		TabFolder tabFolder = new TabFolder(colorGrp, SWT.NONE);
 		tabFolder.setLayoutData(new GridData(GridData.FILL_BOTH));

 		TabItem systemTab = new TabItem(tabFolder, SWT.NONE);
 		systemTab.setText("System Colors");
 		systemTab.setControl(createSystemColorsControl(tabFolder));

 		TabItem namedTab = new TabItem(tabFolder, SWT.NONE);
 		namedTab.setText("Named Colors");
 		namedTab.setControl(createNamedColorsControl(tabFolder));

 		Button browserButton = new Button(colorGrp, SWT.PUSH);
 		browserButton.setText("System Color Dialog");
 		browserButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		browserButton.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				ColorDialog colorDialog = new ColorDialog(getShell());
 				RGB open = colorDialog.open();
 				if (open != null) {
 					preview(open);
 				}
 			}
 		});
 	}

 	private Control createNamedColorsControl(Composite parent) {
 		ScrolledComposite scrollable = new ScrolledComposite(parent, SWT.BORDER | SWT.V_SCROLL);
 		Composite control = new Composite(scrollable, SWT.NONE);
 		control.setLayout(new GridLayout(16, true));
 		control.setBackground(BACKGROUND);
 		String[] namedColors = NamedColorsUtil.getColorNames();
 		for (String colorName : namedColors) {
 			addNamedColor(control, colorName);
 		}
 		scrollable.setContent(control);
 		scrollable.setExpandVertical(true);
 		scrollable.setExpandHorizontal(true);
 		scrollable.setMinSize(control.computeSize(-200, SWT.DEFAULT));
 		scrollable.setBackground(BACKGROUND);
 		return scrollable;
 	}

 	private void addNamedColor(Composite control, final String colorName) {
 		final CLabel colorLabel = new CLabel(control, SWT.NONE);
 		colorLabel.setBackground(BACKGROUND);
 		// colorLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		colorLabel.setToolTipText(colorName);
 		// colorLabel.setText(colorName);
 		Color color = NamedColorsUtil.getColor(colorName);
 		if (color != null) {
 			Display device = Display.getCurrent();
 			Image image = new Image(device, 18, 18);
 			GC gc = new GC(image);
 			gc.setBackground(color);
 			gc.fillRectangle(0, 0, 18, 18);
 			gc.dispose();
 			colorLabel.setImage(image);
 		}
 		final Display display = getShell().getDisplay();
 		colorLabel.addListener(SWT.MouseExit, new Listener() {
 			public void handleEvent(Event event) {
 				if (colorLabel != selection) {
 					colorLabel.setBackground(BACKGROUND);
 				}
 			}
 		});

 		colorLabel.addListener(SWT.MouseEnter, new Listener() {
 			public void handleEvent(Event event) {
 				if (colorLabel != selection) {
 					colorLabel.setBackground(new Color[] { display.getSystemColor(SWT.COLOR_WHITE), display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND) }, new int[] { 100 }, true);
 				}
 			}
 		});

 		colorLabel.addListener(SWT.MouseDown, new Listener() {
 			public void handleEvent(Event event) {
 				Control oldSelection = selection;
 				if (oldSelection == null || oldSelection != colorLabel) {
 					colorLabel.setBackground(new Color[] { display.getSystemColor(SWT.COLOR_WHITE), display.getSystemColor(SWT.COLOR_GRAY) }, new int[] { 100 }, true);
 					preview(colorName);
 					selection = colorLabel;
 				} else {
 					selection = null;
 					preview(null);
 				}
 				if (oldSelection != null) {
 					oldSelection.setBackground(BACKGROUND);
 				}
 			}
 		});
 	}

 	private Control createSystemColorsControl(Composite parent) {
 		Composite control = new Composite(parent, SWT.BORDER);
 		control.setLayout(new GridLayout(16, true));
 		control.setBackground(BACKGROUND);
 		Collection<String> systemColors = XWTMaps.getColorKeys();
 		for (String sysColor : systemColors) {
 			addSystemColor(control, sysColor);
 		}
 		return control;
 	}

 	private void addSystemColor(Composite parent, final String systemColor) {
 		final CLabel colorLabel = new CLabel(parent, SWT.NONE);
 		colorLabel.setBackground(BACKGROUND);
 		colorLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		colorLabel.setToolTipText(systemColor);
 		Color color = ResourceManager.resources.getColor(systemColor);
 		if (color != null) {
 			Display device = Display.getCurrent();
 			Image image = new Image(device, 18, 18);
 			GC gc = new GC(image);
 			gc.setBackground(color);
 			gc.fillRectangle(0, 0, 18, 18);
 			gc.dispose();
 			colorLabel.setImage(image);
 		}
 		final Display display = getShell().getDisplay();
 		colorLabel.addListener(SWT.MouseExit, new Listener() {
 			public void handleEvent(Event event) {
 				if (colorLabel != selection) {
 					colorLabel.setBackground(BACKGROUND);
 				}
 			}
 		});

 		colorLabel.addListener(SWT.MouseEnter, new Listener() {
 			public void handleEvent(Event event) {
 				if (colorLabel != selection) {
 					colorLabel.setBackground(new Color[] { display.getSystemColor(SWT.COLOR_WHITE), display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND) }, new int[] { 100 }, true);
 				}
 			}
 		});

 		colorLabel.addListener(SWT.MouseDown, new Listener() {
 			public void handleEvent(Event event) {
 				Control oldSelection = selection;
 				if (oldSelection == null || oldSelection != colorLabel) {
 					colorLabel.setBackground(new Color[] { display.getSystemColor(SWT.COLOR_WHITE), display.getSystemColor(SWT.COLOR_GRAY) }, new int[] { 100 }, true);
 					preview(systemColor);
 					selection = colorLabel;
 				} else {
 					selection = null;
 					preview(null);
 				}
 				if (oldSelection != null) {
 					oldSelection.setBackground(BACKGROUND);
 				}
 			}
 		});
 	}

 	private Color getColor(Object object) {
 		if (object == null) {
 			return null;
 		}
 		Color color = colorsMap.get(object);
 		if (color != null && !color.isDisposed()) {
 			return color;
 		}
 		if (object instanceof String) {
 			String colorStr = ((String) object).trim();
 			IConverter c = XWT.findConvertor(String.class, Color.class);
 			if (c != null) {
 				color = (Color) c.convert(colorStr);
 			}
 		} else if (object instanceof RGB) {
 			color = new Color(null, (RGB) object);
 			colorsMap.put(object, color);
 		} else if (object instanceof Color) {
 			color = (Color) object;
 		}
 		return color;
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.jface.dialogs.Dialog#close()
 	 */
 	public boolean close() {
 		Collection<Color> values = colorsMap.values();
 		for (Color color : values) {
 			if (color != null) {
 				color.dispose();
 			}
 		}
 		colorsMap.clear();
 		return super.close();
 	}

 	private void preview(Object object) {
 		Color color = getColor(object);
 		if (color != null && !color.isDisposed()) {
 			int red = color.getRed();
 			int green = color.getGreen();
 			int blue = color.getBlue();
 			if (object instanceof String) {
 				result = (String) object;
 			} else {
 				result = red + "," + green + "," + blue;
 			}
 			previewCanvas.setBackground(color);
 			redText.setText("" + red);
 			greenText.setText("" + green);
 			blueText.setText("" + blue);
 			resultText.setText(result);
 		} else {
 			previewCanvas.setBackground(null);
 			redText.setText("");
 			greenText.setText("");
 			blueText.setText("");
 			resultText.setText("");
 		}
 	}

 	private void createPreviewGrp(Composite parent) {
 		Group previewGrp = new Group(parent, SWT.NONE);
 		previewGrp.setText("Selected Color");
 		previewGrp.setLayout(new GridLayout(3, false));
 		previewGrp.setLayoutData(new GridData(GridData.FILL_BOTH));

 		previewCanvas = new Canvas(previewGrp, SWT.BORDER);
 		GridData layoutData = new GridData(GridData.FILL_BOTH);
 		layoutData.verticalSpan = 4;
 		previewCanvas.setLayoutData(layoutData);

 		redText = createTextGroup(previewGrp, "R:");
 		greenText = createTextGroup(previewGrp, "G:");
 		blueText = createTextGroup(previewGrp, "B:");
 		resultText = createTextGroup(previewGrp, "Result:");
 	}

 	private Text createTextGroup(Composite parent, String name) {
 		Label label = new Label(parent, SWT.CENTER);
 		label.setText(name);
 		final Text text = new Text(parent, SWT.READ_ONLY);
 		text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
 		return text;
 	}

 	public String getColor() {
 		return result;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2006, 2010 Soyatec (http://www.soyatec.com) 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:
	* Soyatec - initial API and implementation
	*******************************************************************************/
	package org.eclipse.xwt.tools.ui.designer.dialogs;

	import java.util.Collection;
	import java.util.HashMap;
	import java.util.Map;

	import org.eclipse.core.databinding.conversion.IConverter;
	import org.eclipse.xwt.XWT;
	import org.eclipse.xwt.XWTMaps;
	import org.eclipse.xwt.utils.NamedColorsUtil;
	import org.eclipse.xwt.utils.ResourceManager;
	import org.eclipse.jface.dialogs.Dialog;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.CLabel;
	import org.eclipse.swt.custom.ScrolledComposite;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.GC;
	import org.eclipse.swt.graphics.Image;
	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.Canvas;
	import org.eclipse.swt.widgets.ColorDialog;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Event;
	import org.eclipse.swt.widgets.Group;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Listener;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.swt.widgets.TabFolder;
	import org.eclipse.swt.widgets.TabItem;
	import org.eclipse.swt.widgets.Text;

	/**
	* @author jliu (jin.liu@soyatec.com)
	*/
	public class ColorChooser extends Dialog {
	private Canvas previewCanvas;
	private Text redText;
	private Text greenText;
	private Text blueText;
	private Text resultText;

	private Object initValue;
	private Map<Object, Color> colorsMap = new HashMap<Object, Color>();

	private String result;

	private static final Color BACKGROUND = Display.getDefault().getSystemColor(SWT.COLOR_WHITE);
	private Control selection;

	public ColorChooser(Shell parent, Object initValue) {
	super(parent);
	this.initValue = initValue;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets.Shell)
	*/
	protected void configureShell(Shell newShell) {
	super.configureShell(newShell);
	newShell.setText("Color Chooser");
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
	*/
	protected Control createDialogArea(Composite parent) {
	Composite dialogArea = (Composite) super.createDialogArea(parent);
	dialogArea.setLayout(new GridLayout(1, true));

	createPreviewGrp(dialogArea);

	createColorGrp(dialogArea);
	if (initValue != null) {
	if (initValue instanceof String) {
	preview((String) initValue);
	} else if (initValue instanceof Color) {
	preview((Color) initValue);
	}
	}

	return dialogArea;
	}

	private void createColorGrp(Composite dialogArea) {
	Group colorGrp = new Group(dialogArea, SWT.NONE);
	colorGrp.setText("Color");
	colorGrp.setLayout(new GridLayout());
	colorGrp.setLayoutData(new GridData(GridData.FILL_BOTH));

	TabFolder tabFolder = new TabFolder(colorGrp, SWT.NONE);
	tabFolder.setLayoutData(new GridData(GridData.FILL_BOTH));

	TabItem systemTab = new TabItem(tabFolder, SWT.NONE);
	systemTab.setText("System Colors");
	systemTab.setControl(createSystemColorsControl(tabFolder));

	TabItem namedTab = new TabItem(tabFolder, SWT.NONE);
	namedTab.setText("Named Colors");
	namedTab.setControl(createNamedColorsControl(tabFolder));

	Button browserButton = new Button(colorGrp, SWT.PUSH);
	browserButton.setText("System Color Dialog");
	browserButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	browserButton.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	ColorDialog colorDialog = new ColorDialog(getShell());
	RGB open = colorDialog.open();
	if (open != null) {
	preview(open);
	}
	}
	});
	}

	private Control createNamedColorsControl(Composite parent) {
	ScrolledComposite scrollable = new ScrolledComposite(parent, SWT.BORDER \| SWT.V_SCROLL);
	Composite control = new Composite(scrollable, SWT.NONE);
	control.setLayout(new GridLayout(16, true));
	control.setBackground(BACKGROUND);
	String[] namedColors = NamedColorsUtil.getColorNames();
	for (String colorName : namedColors) {
	addNamedColor(control, colorName);
	}
	scrollable.setContent(control);
	scrollable.setExpandVertical(true);
	scrollable.setExpandHorizontal(true);
	scrollable.setMinSize(control.computeSize(-200, SWT.DEFAULT));
	scrollable.setBackground(BACKGROUND);
	return scrollable;
	}

	private void addNamedColor(Composite control, final String colorName) {
	final CLabel colorLabel = new CLabel(control, SWT.NONE);
	colorLabel.setBackground(BACKGROUND);
	// colorLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	colorLabel.setToolTipText(colorName);
	// colorLabel.setText(colorName);
	Color color = NamedColorsUtil.getColor(colorName);
	if (color != null) {
	Display device = Display.getCurrent();
	Image image = new Image(device, 18, 18);
	GC gc = new GC(image);
	gc.setBackground(color);
	gc.fillRectangle(0, 0, 18, 18);
	gc.dispose();
	colorLabel.setImage(image);
	}
	final Display display = getShell().getDisplay();
	colorLabel.addListener(SWT.MouseExit, new Listener() {
	public void handleEvent(Event event) {
	if (colorLabel != selection) {
	colorLabel.setBackground(BACKGROUND);
	}
	}
	});

	colorLabel.addListener(SWT.MouseEnter, new Listener() {
	public void handleEvent(Event event) {
	if (colorLabel != selection) {
	colorLabel.setBackground(new Color[] { display.getSystemColor(SWT.COLOR_WHITE), display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND) }, new int[] { 100 }, true);
	}
	}
	});

	colorLabel.addListener(SWT.MouseDown, new Listener() {
	public void handleEvent(Event event) {
	Control oldSelection = selection;
	if (oldSelection == null \|\| oldSelection != colorLabel) {
	colorLabel.setBackground(new Color[] { display.getSystemColor(SWT.COLOR_WHITE), display.getSystemColor(SWT.COLOR_GRAY) }, new int[] { 100 }, true);
	preview(colorName);
	selection = colorLabel;
	} else {
	selection = null;
	preview(null);
	}
	if (oldSelection != null) {
	oldSelection.setBackground(BACKGROUND);
	}
	}
	});
	}

	private Control createSystemColorsControl(Composite parent) {
	Composite control = new Composite(parent, SWT.BORDER);
	control.setLayout(new GridLayout(16, true));
	control.setBackground(BACKGROUND);
	Collection<String> systemColors = XWTMaps.getColorKeys();
	for (String sysColor : systemColors) {
	addSystemColor(control, sysColor);
	}
	return control;
	}

	private void addSystemColor(Composite parent, final String systemColor) {
	final CLabel colorLabel = new CLabel(parent, SWT.NONE);
	colorLabel.setBackground(BACKGROUND);
	colorLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	colorLabel.setToolTipText(systemColor);
	Color color = ResourceManager.resources.getColor(systemColor);
	if (color != null) {
	Display device = Display.getCurrent();
	Image image = new Image(device, 18, 18);
	GC gc = new GC(image);
	gc.setBackground(color);
	gc.fillRectangle(0, 0, 18, 18);
	gc.dispose();
	colorLabel.setImage(image);
	}
	final Display display = getShell().getDisplay();
	colorLabel.addListener(SWT.MouseExit, new Listener() {
	public void handleEvent(Event event) {
	if (colorLabel != selection) {
	colorLabel.setBackground(BACKGROUND);
	}
	}
	});

	colorLabel.addListener(SWT.MouseEnter, new Listener() {
	public void handleEvent(Event event) {
	if (colorLabel != selection) {
	colorLabel.setBackground(new Color[] { display.getSystemColor(SWT.COLOR_WHITE), display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND) }, new int[] { 100 }, true);
	}
	}
	});

	colorLabel.addListener(SWT.MouseDown, new Listener() {
	public void handleEvent(Event event) {
	Control oldSelection = selection;
	if (oldSelection == null \|\| oldSelection != colorLabel) {
	colorLabel.setBackground(new Color[] { display.getSystemColor(SWT.COLOR_WHITE), display.getSystemColor(SWT.COLOR_GRAY) }, new int[] { 100 }, true);
	preview(systemColor);
	selection = colorLabel;
	} else {
	selection = null;
	preview(null);
	}
	if (oldSelection != null) {
	oldSelection.setBackground(BACKGROUND);
	}
	}
	});
	}

	private Color getColor(Object object) {
	if (object == null) {
	return null;
	}
	Color color = colorsMap.get(object);
	if (color != null && !color.isDisposed()) {
	return color;
	}
	if (object instanceof String) {
	String colorStr = ((String) object).trim();
	IConverter c = XWT.findConvertor(String.class, Color.class);
	if (c != null) {
	color = (Color) c.convert(colorStr);
	}
	} else if (object instanceof RGB) {
	color = new Color(null, (RGB) object);
	colorsMap.put(object, color);
	} else if (object instanceof Color) {
	color = (Color) object;
	}
	return color;
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.jface.dialogs.Dialog#close()
	*/
	public boolean close() {
	Collection<Color> values = colorsMap.values();
	for (Color color : values) {
	if (color != null) {
	color.dispose();
	}
	}
	colorsMap.clear();
	return super.close();
	}

	private void preview(Object object) {
	Color color = getColor(object);
	if (color != null && !color.isDisposed()) {
	int red = color.getRed();
	int green = color.getGreen();
	int blue = color.getBlue();
	if (object instanceof String) {
	result = (String) object;
	} else {
	result = red + "," + green + "," + blue;
	}
	previewCanvas.setBackground(color);
	redText.setText("" + red);
	greenText.setText("" + green);
	blueText.setText("" + blue);
	resultText.setText(result);
	} else {
	previewCanvas.setBackground(null);
	redText.setText("");
	greenText.setText("");
	blueText.setText("");
	resultText.setText("");
	}
	}

	private void createPreviewGrp(Composite parent) {
	Group previewGrp = new Group(parent, SWT.NONE);
	previewGrp.setText("Selected Color");
	previewGrp.setLayout(new GridLayout(3, false));
	previewGrp.setLayoutData(new GridData(GridData.FILL_BOTH));

	previewCanvas = new Canvas(previewGrp, SWT.BORDER);
	GridData layoutData = new GridData(GridData.FILL_BOTH);
	layoutData.verticalSpan = 4;
	previewCanvas.setLayoutData(layoutData);

	redText = createTextGroup(previewGrp, "R:");
	greenText = createTextGroup(previewGrp, "G:");
	blueText = createTextGroup(previewGrp, "B:");
	resultText = createTextGroup(previewGrp, "Result:");
	}

	private Text createTextGroup(Composite parent, String name) {
	Label label = new Label(parent, SWT.CENTER);
	label.setText(name);
	final Text text = new Text(parent, SWT.READ_ONLY);
	text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
	return text;
	}

	public String getColor() {
	return result;
	}
	}