org.eclipse.gmf.runtime.common.ui/src/org/eclipse/gmf/runtime/common/ui/dialogs/GradientSelectionDialog.java - gmf-runtime/org.eclipse.gmf-runtime - Git at Google

 /******************************************************************************
  * Copyright (c) 2009 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.common.ui.dialogs;

 import java.util.ArrayList;

 import org.eclipse.gmf.runtime.common.ui.internal.l10n.CommonUIMessages;
 import org.eclipse.gmf.runtime.common.ui.util.WindowUtil;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.GC;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.RGB;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.graphics.Resource;
 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.Dialog;
 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;

 /**
  * Dialog that allows selection of two gradient colors and gradient style, and
  * optionally background transparency.
  *
  * @author lgrahek
  * @since 1.2
  *
  */
 public class GradientSelectionDialog extends Dialog {

 	protected Button color1Button, color2Button;
 	protected Canvas canvas;
 	private Button verticalStyle, horizontalStyle;
 	private Button okButton, cancelButton, clearButton;

 	private RGB gradientColor1;
 	private RGB gradientColor2;
 	private int gradientStyle;

 	private int transparency;

 	/**
 	 * value to be returned by open(), set to SWT.OK if the ok button has been pressed
 	 */
 	int returnVal;

 	ArrayList<Resource> resources;


 	/**
 	 * Initializes dialog with the gradient and transparency data.
 	 *
 	 * @param parent
 	 *            the parent shell
 	 * @param style
 	 *            shell style
 	 * @param initColor1
 	 *            initial gradient color 1
 	 * @param initColor2
 	 *            initial gradient color 2
 	 * @param defaultGradientStyle
 	 *            initial gradient style
 	 * @param transparency
 	 *            transparency used when drawing the sample. It is ignored if
 	 *            not within [0, 100] range
 	 */
 	public GradientSelectionDialog(Shell parent, int style,
 			RGB initColor1, RGB initColor2, int defaultGradientStyle,
 			int transparency) {
 		super(parent, style);
 		setGradientColor1(initColor1);
 		setGradientColor2(initColor2);
 		setGradientStyle(defaultGradientStyle);
 		if (transparency < 0 || transparency > 100) {
 			setTransparency(0);
 		} else {
 			setTransparency(transparency);
 		}
 		returnVal = SWT.CANCEL;
 		resources = new ArrayList<Resource>();

 	}

 	/**
 	 * Opens the dialog. Location is not given and the dialog will be placed at the center of the screen
 	 */
 	public int open() {
 		return open(null);
 	}

 	/**
 	 * Sets up the dialog and opens it at given location.
 	 *
 	 * @param location
 	 *            Initial location of the dialog
 	 * @return SWT.OK if ok button is clicked, SWT.CANCEL if cancel button is
 	 *         clicked
 	 */
 	public int open(Point location) {
 		final Shell dialog = new Shell(getParent(), SWT.DIALOG_TRIM | getStyle());
 		dialog.setText(CommonUIMessages.GradientSelection_Gradient);

 		GridLayout gridLayout = new GridLayout();
 	    gridLayout.numColumns = 1;
 	    gridLayout.marginHeight = 10;
 	    gridLayout.marginWidth = 10;
 	    dialog.setLayout(gridLayout);

 	    createDialogControls(dialog);
 		dialog.setDefaultButton (okButton);
 		dialog.pack();

 		Rectangle bounds = dialog.getBounds();
 		// if location is not given, place the dialog at the center of the screen
 		if (location == null) {
 			Rectangle rect = getParent().getMonitor().getBounds();
 			dialog.setLocation(rect.x + (rect.width - bounds.width) / 2, rect.y + (rect.height - bounds.height) / 2);
 		} else {
 			dialog.setLocation(location);
 		}
 		dialog.setMinimumSize(bounds.width, bounds.height);

 		dialog.addListener(SWT.Close, new Listener() {
 			public void handleEvent(Event event) {
 				for (int i = 0; i < resources.size(); i++) {
 					Object obj = resources.get(i);
 					if (obj != null && obj instanceof Resource) {
 						((Resource) obj).dispose();
 					}
 				}
 				dialog.dispose();
 			}
 		});

 		dialog.open ();

 		Display display = getParent().getDisplay();
 		while (!dialog.isDisposed()) {
 			if (!display.readAndDispatch()) display.sleep();
 		}

 		return returnVal;
 	}

 	/**
 	 * Creates the controls of the dialog.
 	 *
 	 * @param parent
 	 *            Parent shell
 	 */
 	protected void createDialogControls(Shell parent) {
 	    GridLayout layout = new GridLayout();
 	    layout.numColumns = 3;
 	    layout.marginHeight = 0;
 	    layout.marginWidth = 0;
 	   	Composite topComposite = new Composite(parent, SWT.NONE);
 	   	topComposite.setLayout(layout);

 		createColorGroup(parent, topComposite);
 		createStyleGroup(topComposite);
 		createSample(parent, topComposite);
 		createOkCancelClearButtons(parent, topComposite);
 	}

 	/**
 	 * Creates controls in the color group
 	 *
 	 * @param parent
 	 *            Parent shell
 	 * @param topComposite
 	 *            Parent composite
 	 */
 	protected void createColorGroup(Shell parent, Composite topComposite) {
 		final Display display = parent.getDisplay();

 		Group colorGroup = new Group(topComposite, SWT.NONE);
 		colorGroup.setText(CommonUIMessages.GradientSelection_Colors);
 	    GridLayout layout = new GridLayout();
 	    layout.numColumns = 2;
 	    GridData gridData = new GridData();
 	    gridData.verticalAlignment = SWT.FILL;
 	    gridData.grabExcessVerticalSpace = true;
 	    colorGroup.setLayout(layout);
 	    colorGroup.setLayoutData(gridData);

 	    Label label = new Label(colorGroup, SWT.NONE);
 	    label.setText(CommonUIMessages.GradientSelection_Color1);
 	    label = new Label(colorGroup, SWT.NONE);
 	    label.setText(CommonUIMessages.GradientSelection_Color2);

 		// button for choosing gradientColor1
 		color1Button = new Button(colorGroup, SWT.PUSH);

 		// set the button image (current gradientColor1)
 		setButtonImage(color1Button, gradientColor1, display);
 		color1Button.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				RGB color = changeColor(color1Button, display, gradientColor1);
 				if (color != null) {
 					setGradientColor1(color);
 				}
 			}
 		});

 		// button for choosing gradientColor2
 		color2Button = new Button(colorGroup, SWT.PUSH);

 		// set the button image (current gradientColor1)
 		setButtonImage(color2Button, gradientColor2, display);
 		color2Button.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				RGB color = changeColor(color2Button, display, gradientColor2);
 				if (color != null) {
 					setGradientColor2(color);
 				}
 			}
 		});
 	}

 	/**
 	 * Creates controls in the gradient style group
 	 *
 	 * @param topComposite
 	 *            Parent composite
 	 */
 	protected void createStyleGroup(Composite topComposite) {
 		Group styleGroup = new Group(topComposite, SWT.NONE);
 		styleGroup.setText(CommonUIMessages.GradientSelection_ShadingStyle);
 	    GridLayout layout = new GridLayout();
 	    layout.numColumns = 1;
 	    GridData gridData = new GridData();
 	    gridData.horizontalAlignment = SWT.FILL;
 	    gridData.verticalAlignment = SWT.FILL;
 	    gridData.grabExcessHorizontalSpace = true;
 	    gridData.grabExcessVerticalSpace = true;
 	    styleGroup.setLayout(layout);
 	    styleGroup.setLayoutData(gridData);

 	    verticalStyle = new Button(styleGroup, SWT.RADIO);
 	    verticalStyle.setText(CommonUIMessages.GradientSelection_Vertical);
 	    verticalStyle.setSelection(gradientStyle == 0);
 	    horizontalStyle = new Button(styleGroup, SWT.RADIO);
 	    horizontalStyle.setText(CommonUIMessages.GradientSelection_Horizontal);
 	    horizontalStyle.setSelection(gradientStyle == 1);

 	    SelectionListener selectionListener = new SelectionAdapter() {
 			public void widgetSelected(SelectionEvent event) {
 				if (!((Button)event.widget).getSelection()) {
 					// don't react on de-selection
 					return;
 				}
 				changeStyle();
 			}
 		};
 		verticalStyle.addSelectionListener(selectionListener);
 		horizontalStyle.addSelectionListener(selectionListener);
 	}

 	/**
 	 * Creates controls in the sample group
 	 *
 	 * @param parent
 	 *            Parent shell
 	 * @param topComposite
 	 *            Parent composite
 	 */
 	protected void createSample(Shell parent, Composite topComposite) {
 		final Display display = parent.getDisplay();

 		Composite sampleComposite = new Composite(topComposite, SWT.NONE);
 		GridLayout layout = new GridLayout();
 	    layout.numColumns = 1;
 	    GridData gridData = new GridData();
 	    gridData.verticalAlignment = SWT.FILL;
 	    gridData.grabExcessVerticalSpace = true;
 	    gridData.verticalAlignment = SWT.BOTTOM;
 		sampleComposite.setLayout(layout);
 		sampleComposite.setLayoutData(gridData);

 		// message
 		Label message = new Label(sampleComposite, SWT.NONE);
 		message.setText(CommonUIMessages.GradientSelection_Sample);
 		gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
 		//gridData.horizontalSpan = 2;
 		message.setLayoutData(gridData);

 		// canvas
 		canvas = new Canvas(sampleComposite, SWT.NONE);
 		gridData = new GridData(GridData.FILL_BOTH);
 		gridData.widthHint = 35;
 		gridData.heightHint = 35;
 		canvas.setLayoutData(gridData);
 		canvas.addListener (SWT.Paint, new Listener () {
 			public void handleEvent (Event e) {
 				Point size = canvas.getSize();
 				Color color1 = new Color(display, gradientColor1);
 				Color color2 = new Color(display, gradientColor2);

 				Image sample = new Image(display, size.x, size.y);
 				GC gc = new GC(sample);
 				Rectangle rect = sample.getBounds();
 				gc.setForeground(color1);
 				gc.setBackground(color2);
 				gc.setAlpha(255-transparency*255/100);
 				gc.fillGradientRectangle(rect.x, rect.y, rect.width, rect.height, gradientStyle==0);
 				gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
 				gc.drawRectangle(rect.x, rect.y, rect.width-1, rect.height-1);

 				if (sample != null) {
 					e.gc.drawImage (sample, 0, 0);
 				}

 				gc.dispose();
 				sample.dispose();
 				color1.dispose();
 				color2.dispose();
 			}
 		});
 	}

 	/**
 	 * Creates ok and cancel buttons
 	 *
 	 * @param parent
 	 *            Parent shell
 	 * @param topComposite
 	 *            Parent composite
 	 */
 	protected void createOkCancelClearButtons(Shell parent, Composite topComposite) {
 		Composite okCancelComp = new Composite(topComposite, SWT.NONE);
 		GridLayout layout = new GridLayout();
 		layout.numColumns = 3;
 		layout.marginWidth = 0;
 		layout.marginHeight = 0;
 		okCancelComp.setLayout(layout);
 		GridData gridData = new GridData();
 		gridData.verticalAlignment = SWT.BOTTOM;
 		gridData.horizontalSpan = 3;
 		okCancelComp.setLayout(layout);
 		okCancelComp.setLayoutData(gridData);

 		// ok button left of cancel button
 		createOkButton(okCancelComp, parent);
 		createCancelButton(okCancelComp, parent);
 		createClearButton(okCancelComp, parent);
 	}

 	/**
 	 * Creates cancel button as part of the given okCancelComp composite
 	 *
 	 * @param okCancelComp
 	 *            Parent composite
 	 * @param parent
 	 *            Parent shell
 	 */
 	protected void createCancelButton(Composite okCancelComp, final Shell parent) {
 		// cancel button
 		cancelButton = new Button (okCancelComp, SWT.PUSH);
 		cancelButton.setText(CommonUIMessages.ShowHideRelationshipsDialog_Button_Cancel);
 		cancelButton.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				parent.close();
 			}
 		});
 		GridData gridData = new GridData();
 		gridData.horizontalAlignment = SWT.FILL;
 		gridData.grabExcessHorizontalSpace = true;
 		cancelButton.setLayoutData(gridData);
 	}

 	/**
 	 * Creates ok button as part of the given okCancelComp composite
 	 *
 	 * @param okCancelComp
 	 *            Parent composite
 	 * @param parent
 	 *            Parent shell
 	 */
 	protected void createOkButton(Composite okCancelComp, final Shell parent) {
 		// OK button
 		okButton = new Button (okCancelComp, SWT.PUSH);
 		okButton.setText(CommonUIMessages.ShowHideRelationshipsDialog_Button_OK);
 		okButton.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				returnVal = SWT.OK;
 				parent.close();
 			}
 		});
 		GridData gridData = new GridData();
 		gridData.horizontalAlignment = SWT.FILL;
 		gridData.grabExcessHorizontalSpace = true;
 		okButton.setLayoutData(gridData);
 	}

 	protected void createClearButton(Composite okCancelComp, final Shell parent) {
 		// OK button
 		clearButton = new Button (okCancelComp, SWT.PUSH);
 		clearButton.setText(CommonUIMessages.ClearAction_label);
 		clearButton.addListener(SWT.Selection, new Listener() {
 			public void handleEvent(Event event) {
 				returnVal = -1;
 				parent.close();
 			}
 		});
 		GridData gridData = new GridData();
 		gridData.horizontalAlignment = SWT.FILL;
 		gridData.grabExcessHorizontalSpace = true;
 		clearButton.setLayoutData(gridData);
 	}

 	/**
 	 * Opens color chooser dialog, and if user selects a color applies it to the
 	 * button and returns it.
 	 *
 	 * @param button
 	 *            Color button whose color will change
 	 * @param display
 	 * @param currentColor
 	 *            Current color that given button represents
 	 * @return Newly selected RGB color
 	 */
 	protected RGB changeColor(Button button, Display display, RGB currentColor) {
 		ColorDialog dialog = new ColorDialog(Display.getCurrent().getActiveShell());

 		dialog.setRGB(currentColor);
 		WindowUtil.centerDialog(dialog.getParent(), Display.getCurrent()
 				.getActiveShell());
 		dialog.open();

 		RGB selectedColor = dialog.getRGB();
 		if (selectedColor != null) {
 			setButtonImage(button, selectedColor, display);
 			canvas.redraw();
 		}
 		return selectedColor;
 	}

 	/**
 	 * Sets the image for a color button (square filled with the color that
 	 * button represents)
 	 */
 	protected void setButtonImage(Button btn, RGB rgbColor, Display display) {
 		// First, dispose the current image, if any
         Image image = btn.getImage();
         if (image != null) {
         	resources.remove(image);
         	image.dispose();
         }
 		// Now set the new image based on rgbColor
 		Color color1 = new Color(display, rgbColor);
 		image = new Image(display, 16, 16);
 		GC gc = new GC(image);
 		gc.setBackground(color1);
 		Rectangle rect = image.getBounds();
 		gc.fillRectangle(rect);
 		gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
 		gc.drawRectangle(rect.x, rect.y, rect.width - 1, rect.height - 1);
 		gc.dispose();
 		color1.dispose();
 		btn.setImage(image);
 		resources.add(image);
 	}

 	/**
 	 * @return the canvas used for drawing sample
 	 */
 	protected Canvas getSampleCanvas() {
 		return canvas;
 	}

 	/**
 	 * Changes gradienStyle and redraws canvas based on style selection.
 	 */
 	private void changeStyle() {
 		if (verticalStyle.getSelection()) {
 			gradientStyle = 0;
 		} else {
 			gradientStyle = 1;
 		}
 		canvas.redraw();
 	}


 	/**
 	 * @return the gradientColor1
 	 */
 	public RGB getGradientColor1() {
 		return gradientColor1;
 	}


 	/**
 	 * @param gradientColor1 the gradientColor1 to set
 	 */
 	public void setGradientColor1(RGB gradientColor1) {
 		this.gradientColor1 = gradientColor1;
 	}


 	/**
 	 * @return the gradientColor2
 	 */
 	public RGB getGradientColor2() {
 		return gradientColor2;
 	}


 	/**
 	 * @param gradientColor2 the gradientColor2 to set
 	 */
 	public void setGradientColor2(RGB gradientColor2) {
 		this.gradientColor2 = gradientColor2;
 	}


 	/**
 	 * @return the gradientStyle
 	 */
 	public int getGradientStyle() {
 		return gradientStyle;
 	}


 	/**
 	 * @param gradientStyle the gradientStyle to set
 	 */
 	public void setGradientStyle(int gradientStyle) {
 		this.gradientStyle = gradientStyle;
 	}


 	/**
 	 * @return the transparency
 	 */
 	public int getTransparency() {
 		return transparency;
 	}


 	/**
 	 * @param transparency the transparency to set
 	 */
 	public void setTransparency(int transparency) {
 		this.transparency = transparency;
 	}

 }
	/******************************************************************************
	* Copyright (c) 2009 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.common.ui.dialogs;

	import java.util.ArrayList;

	import org.eclipse.gmf.runtime.common.ui.internal.l10n.CommonUIMessages;
	import org.eclipse.gmf.runtime.common.ui.util.WindowUtil;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.graphics.Color;
	import org.eclipse.swt.graphics.GC;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.graphics.RGB;
	import org.eclipse.swt.graphics.Rectangle;
	import org.eclipse.swt.graphics.Resource;
	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.Dialog;
	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;

	/**
	* Dialog that allows selection of two gradient colors and gradient style, and
	* optionally background transparency.
	*
	* @author lgrahek
	* @since 1.2
	*
	*/
	public class GradientSelectionDialog extends Dialog {

	protected Button color1Button, color2Button;
	protected Canvas canvas;
	private Button verticalStyle, horizontalStyle;
	private Button okButton, cancelButton, clearButton;

	private RGB gradientColor1;
	private RGB gradientColor2;
	private int gradientStyle;

	private int transparency;

	/**
	* value to be returned by open(), set to SWT.OK if the ok button has been pressed
	*/
	int returnVal;

	ArrayList<Resource> resources;


	/**
	* Initializes dialog with the gradient and transparency data.
	*
	* @param parent
	* the parent shell
	* @param style
	* shell style
	* @param initColor1
	* initial gradient color 1
	* @param initColor2
	* initial gradient color 2
	* @param defaultGradientStyle
	* initial gradient style
	* @param transparency
	* transparency used when drawing the sample. It is ignored if
	* not within [0, 100] range
	*/
	public GradientSelectionDialog(Shell parent, int style,
	RGB initColor1, RGB initColor2, int defaultGradientStyle,
	int transparency) {
	super(parent, style);
	setGradientColor1(initColor1);
	setGradientColor2(initColor2);
	setGradientStyle(defaultGradientStyle);
	if (transparency < 0 \|\| transparency > 100) {
	setTransparency(0);
	} else {
	setTransparency(transparency);
	}
	returnVal = SWT.CANCEL;
	resources = new ArrayList<Resource>();

	}

	/**
	* Opens the dialog. Location is not given and the dialog will be placed at the center of the screen
	*/
	public int open() {
	return open(null);
	}

	/**
	* Sets up the dialog and opens it at given location.
	*
	* @param location
	* Initial location of the dialog
	* @return SWT.OK if ok button is clicked, SWT.CANCEL if cancel button is
	* clicked
	*/
	public int open(Point location) {
	final Shell dialog = new Shell(getParent(), SWT.DIALOG_TRIM \| getStyle());
	dialog.setText(CommonUIMessages.GradientSelection_Gradient);

	GridLayout gridLayout = new GridLayout();
	gridLayout.numColumns = 1;
	gridLayout.marginHeight = 10;
	gridLayout.marginWidth = 10;
	dialog.setLayout(gridLayout);

	createDialogControls(dialog);
	dialog.setDefaultButton (okButton);
	dialog.pack();

	Rectangle bounds = dialog.getBounds();
	// if location is not given, place the dialog at the center of the screen
	if (location == null) {
	Rectangle rect = getParent().getMonitor().getBounds();
	dialog.setLocation(rect.x + (rect.width - bounds.width) / 2, rect.y + (rect.height - bounds.height) / 2);
	} else {
	dialog.setLocation(location);
	}
	dialog.setMinimumSize(bounds.width, bounds.height);

	dialog.addListener(SWT.Close, new Listener() {
	public void handleEvent(Event event) {
	for (int i = 0; i < resources.size(); i++) {
	Object obj = resources.get(i);
	if (obj != null && obj instanceof Resource) {
	((Resource) obj).dispose();
	}
	}
	dialog.dispose();
	}
	});

	dialog.open ();

	Display display = getParent().getDisplay();
	while (!dialog.isDisposed()) {
	if (!display.readAndDispatch()) display.sleep();
	}

	return returnVal;
	}

	/**
	* Creates the controls of the dialog.
	*
	* @param parent
	* Parent shell
	*/
	protected void createDialogControls(Shell parent) {
	GridLayout layout = new GridLayout();
	layout.numColumns = 3;
	layout.marginHeight = 0;
	layout.marginWidth = 0;
	Composite topComposite = new Composite(parent, SWT.NONE);
	topComposite.setLayout(layout);

	createColorGroup(parent, topComposite);
	createStyleGroup(topComposite);
	createSample(parent, topComposite);
	createOkCancelClearButtons(parent, topComposite);
	}

	/**
	* Creates controls in the color group
	*
	* @param parent
	* Parent shell
	* @param topComposite
	* Parent composite
	*/
	protected void createColorGroup(Shell parent, Composite topComposite) {
	final Display display = parent.getDisplay();

	Group colorGroup = new Group(topComposite, SWT.NONE);
	colorGroup.setText(CommonUIMessages.GradientSelection_Colors);
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	GridData gridData = new GridData();
	gridData.verticalAlignment = SWT.FILL;
	gridData.grabExcessVerticalSpace = true;
	colorGroup.setLayout(layout);
	colorGroup.setLayoutData(gridData);

	Label label = new Label(colorGroup, SWT.NONE);
	label.setText(CommonUIMessages.GradientSelection_Color1);
	label = new Label(colorGroup, SWT.NONE);
	label.setText(CommonUIMessages.GradientSelection_Color2);

	// button for choosing gradientColor1
	color1Button = new Button(colorGroup, SWT.PUSH);

	// set the button image (current gradientColor1)
	setButtonImage(color1Button, gradientColor1, display);
	color1Button.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	RGB color = changeColor(color1Button, display, gradientColor1);
	if (color != null) {
	setGradientColor1(color);
	}
	}
	});

	// button for choosing gradientColor2
	color2Button = new Button(colorGroup, SWT.PUSH);

	// set the button image (current gradientColor1)
	setButtonImage(color2Button, gradientColor2, display);
	color2Button.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	RGB color = changeColor(color2Button, display, gradientColor2);
	if (color != null) {
	setGradientColor2(color);
	}
	}
	});
	}

	/**
	* Creates controls in the gradient style group
	*
	* @param topComposite
	* Parent composite
	*/
	protected void createStyleGroup(Composite topComposite) {
	Group styleGroup = new Group(topComposite, SWT.NONE);
	styleGroup.setText(CommonUIMessages.GradientSelection_ShadingStyle);
	GridLayout layout = new GridLayout();
	layout.numColumns = 1;
	GridData gridData = new GridData();
	gridData.horizontalAlignment = SWT.FILL;
	gridData.verticalAlignment = SWT.FILL;
	gridData.grabExcessHorizontalSpace = true;
	gridData.grabExcessVerticalSpace = true;
	styleGroup.setLayout(layout);
	styleGroup.setLayoutData(gridData);

	verticalStyle = new Button(styleGroup, SWT.RADIO);
	verticalStyle.setText(CommonUIMessages.GradientSelection_Vertical);
	verticalStyle.setSelection(gradientStyle == 0);
	horizontalStyle = new Button(styleGroup, SWT.RADIO);
	horizontalStyle.setText(CommonUIMessages.GradientSelection_Horizontal);
	horizontalStyle.setSelection(gradientStyle == 1);

	SelectionListener selectionListener = new SelectionAdapter() {
	public void widgetSelected(SelectionEvent event) {
	if (!((Button)event.widget).getSelection()) {
	// don't react on de-selection
	return;
	}
	changeStyle();
	}
	};
	verticalStyle.addSelectionListener(selectionListener);
	horizontalStyle.addSelectionListener(selectionListener);
	}

	/**
	* Creates controls in the sample group
	*
	* @param parent
	* Parent shell
	* @param topComposite
	* Parent composite
	*/
	protected void createSample(Shell parent, Composite topComposite) {
	final Display display = parent.getDisplay();

	Composite sampleComposite = new Composite(topComposite, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.numColumns = 1;
	GridData gridData = new GridData();
	gridData.verticalAlignment = SWT.FILL;
	gridData.grabExcessVerticalSpace = true;
	gridData.verticalAlignment = SWT.BOTTOM;
	sampleComposite.setLayout(layout);
	sampleComposite.setLayoutData(gridData);

	// message
	Label message = new Label(sampleComposite, SWT.NONE);
	message.setText(CommonUIMessages.GradientSelection_Sample);
	gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
	//gridData.horizontalSpan = 2;
	message.setLayoutData(gridData);

	// canvas
	canvas = new Canvas(sampleComposite, SWT.NONE);
	gridData = new GridData(GridData.FILL_BOTH);
	gridData.widthHint = 35;
	gridData.heightHint = 35;
	canvas.setLayoutData(gridData);
	canvas.addListener (SWT.Paint, new Listener () {
	public void handleEvent (Event e) {
	Point size = canvas.getSize();
	Color color1 = new Color(display, gradientColor1);
	Color color2 = new Color(display, gradientColor2);

	Image sample = new Image(display, size.x, size.y);
	GC gc = new GC(sample);
	Rectangle rect = sample.getBounds();
	gc.setForeground(color1);
	gc.setBackground(color2);
	gc.setAlpha(255-transparency*255/100);
	gc.fillGradientRectangle(rect.x, rect.y, rect.width, rect.height, gradientStyle==0);
	gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
	gc.drawRectangle(rect.x, rect.y, rect.width-1, rect.height-1);

	if (sample != null) {
	e.gc.drawImage (sample, 0, 0);
	}

	gc.dispose();
	sample.dispose();
	color1.dispose();
	color2.dispose();
	}
	});
	}

	/**
	* Creates ok and cancel buttons
	*
	* @param parent
	* Parent shell
	* @param topComposite
	* Parent composite
	*/
	protected void createOkCancelClearButtons(Shell parent, Composite topComposite) {
	Composite okCancelComp = new Composite(topComposite, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.numColumns = 3;
	layout.marginWidth = 0;
	layout.marginHeight = 0;
	okCancelComp.setLayout(layout);
	GridData gridData = new GridData();
	gridData.verticalAlignment = SWT.BOTTOM;
	gridData.horizontalSpan = 3;
	okCancelComp.setLayout(layout);
	okCancelComp.setLayoutData(gridData);

	// ok button left of cancel button
	createOkButton(okCancelComp, parent);
	createCancelButton(okCancelComp, parent);
	createClearButton(okCancelComp, parent);
	}

	/**
	* Creates cancel button as part of the given okCancelComp composite
	*
	* @param okCancelComp
	* Parent composite
	* @param parent
	* Parent shell
	*/
	protected void createCancelButton(Composite okCancelComp, final Shell parent) {
	// cancel button
	cancelButton = new Button (okCancelComp, SWT.PUSH);
	cancelButton.setText(CommonUIMessages.ShowHideRelationshipsDialog_Button_Cancel);
	cancelButton.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	parent.close();
	}
	});
	GridData gridData = new GridData();
	gridData.horizontalAlignment = SWT.FILL;
	gridData.grabExcessHorizontalSpace = true;
	cancelButton.setLayoutData(gridData);
	}

	/**
	* Creates ok button as part of the given okCancelComp composite
	*
	* @param okCancelComp
	* Parent composite
	* @param parent
	* Parent shell
	*/
	protected void createOkButton(Composite okCancelComp, final Shell parent) {
	// OK button
	okButton = new Button (okCancelComp, SWT.PUSH);
	okButton.setText(CommonUIMessages.ShowHideRelationshipsDialog_Button_OK);
	okButton.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	returnVal = SWT.OK;
	parent.close();
	}
	});
	GridData gridData = new GridData();
	gridData.horizontalAlignment = SWT.FILL;
	gridData.grabExcessHorizontalSpace = true;
	okButton.setLayoutData(gridData);
	}

	protected void createClearButton(Composite okCancelComp, final Shell parent) {
	// OK button
	clearButton = new Button (okCancelComp, SWT.PUSH);
	clearButton.setText(CommonUIMessages.ClearAction_label);
	clearButton.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event event) {
	returnVal = -1;
	parent.close();
	}
	});
	GridData gridData = new GridData();
	gridData.horizontalAlignment = SWT.FILL;
	gridData.grabExcessHorizontalSpace = true;
	clearButton.setLayoutData(gridData);
	}

	/**
	* Opens color chooser dialog, and if user selects a color applies it to the
	* button and returns it.
	*
	* @param button
	* Color button whose color will change
	* @param display
	* @param currentColor
	* Current color that given button represents
	* @return Newly selected RGB color
	*/
	protected RGB changeColor(Button button, Display display, RGB currentColor) {
	ColorDialog dialog = new ColorDialog(Display.getCurrent().getActiveShell());

	dialog.setRGB(currentColor);
	WindowUtil.centerDialog(dialog.getParent(), Display.getCurrent()
	.getActiveShell());
	dialog.open();

	RGB selectedColor = dialog.getRGB();
	if (selectedColor != null) {
	setButtonImage(button, selectedColor, display);
	canvas.redraw();
	}
	return selectedColor;
	}

	/**
	* Sets the image for a color button (square filled with the color that
	* button represents)
	*/
	protected void setButtonImage(Button btn, RGB rgbColor, Display display) {
	// First, dispose the current image, if any
	Image image = btn.getImage();
	if (image != null) {
	resources.remove(image);
	image.dispose();
	}
	// Now set the new image based on rgbColor
	Color color1 = new Color(display, rgbColor);
	image = new Image(display, 16, 16);
	GC gc = new GC(image);
	gc.setBackground(color1);
	Rectangle rect = image.getBounds();
	gc.fillRectangle(rect);
	gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
	gc.drawRectangle(rect.x, rect.y, rect.width - 1, rect.height - 1);
	gc.dispose();
	color1.dispose();
	btn.setImage(image);
	resources.add(image);
	}

	/**
	* @return the canvas used for drawing sample
	*/
	protected Canvas getSampleCanvas() {
	return canvas;
	}

	/**
	* Changes gradienStyle and redraws canvas based on style selection.
	*/
	private void changeStyle() {
	if (verticalStyle.getSelection()) {
	gradientStyle = 0;
	} else {
	gradientStyle = 1;
	}
	canvas.redraw();
	}


	/**
	* @return the gradientColor1
	*/
	public RGB getGradientColor1() {
	return gradientColor1;
	}


	/**
	* @param gradientColor1 the gradientColor1 to set
	*/
	public void setGradientColor1(RGB gradientColor1) {
	this.gradientColor1 = gradientColor1;
	}


	/**
	* @return the gradientColor2
	*/
	public RGB getGradientColor2() {
	return gradientColor2;
	}


	/**
	* @param gradientColor2 the gradientColor2 to set
	*/
	public void setGradientColor2(RGB gradientColor2) {
	this.gradientColor2 = gradientColor2;
	}


	/**
	* @return the gradientStyle
	*/
	public int getGradientStyle() {
	return gradientStyle;
	}


	/**
	* @param gradientStyle the gradientStyle to set
	*/
	public void setGradientStyle(int gradientStyle) {
	this.gradientStyle = gradientStyle;
	}


	/**
	* @return the transparency
	*/
	public int getTransparency() {
	return transparency;
	}


	/**
	* @param transparency the transparency to set
	*/
	public void setTransparency(int transparency) {
	this.transparency = transparency;
	}

	}