/*******************************************************************************

 * Copyright (c) 2000, 2007 IBM Corporation and others.

 * Portion Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

 * 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

 *     Nokia Corporation - Qt implementation

 *******************************************************************************/

package org.eclipse.swt.widgets;

import org.eclipse.swt.*;

import org.eclipse.swt.internal.qt.OS;

import org.eclipse.swt.events.DisposeEvent;

import org.eclipse.swt.events.DisposeListener;

import org.eclipse.swt.graphics.*;

/**

 * Instances of this class allow the user to select a color

 * from a predefined set of available colors.

 * <dl>

 * <dt><b>Styles:</b></dt>

 * <dd>(none)</dd>

 * <dt><b>Events:</b></dt>

 * <dd>(none)</dd>

 * </dl>

 * <p>

 * IMPORTANT: This class is intended to be subclassed <em>only</em>

 * within the SWT implementation.

 * </p>

 */

public class ColorDialog extends Dialog {

    RGB rgb;

    String dialogID;

    static int dialogCount;

/**

 * Constructs a new instance of this class given only its parent.

 *

 * @param parent a composite control which will be the parent of the new instance

 *

 * @exception IllegalArgumentException <ul>

 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>

 * </ul>

 * @exception SWTException <ul>

 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>

 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>

 * </ul>

 *

 * @see SWT

 * @see Widget#checkSubclass

 * @see Widget#getStyle

 */

public ColorDialog (Shell parent) {

    this (parent, SWT.NONE);

    dialogCount++;

    dialogID = toString() + String.valueOf(dialogCount);

}

/**

 * Constructs a new instance of this class given its parent

 * and a style value describing its behavior and appearance.

 * <p>

 * The style value is either one of the style constants defined in

 * class <code>SWT</code> which is applicable to instances of this

 * class, or must be built by <em>bitwise OR</em>'ing together 

 * (that is, using the <code>int</code> "|" operator) two or more

 * of those <code>SWT</code> style constants. The class description

 * lists the style constants that are applicable to the class.

 * Style bits are also inherited from superclasses.

 * </p>

 *

 * @param parent a composite control which will be the parent of the new instance (cannot be null)

 * @param style the style of control to construct

 *

 * @exception IllegalArgumentException <ul>

 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>

 * </ul>

 * @exception SWTException <ul>

 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>

 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>

 * </ul>

 *

 * @see SWT

 * @see Widget#checkSubclass

 * @see Widget#getStyle

 */

public ColorDialog (Shell parent, int style) {

    super (parent, parent == null? style : checkStyle (parent, style));

    checkSubclass ();

    dialogCount++;

    dialogID = toString() + String.valueOf(dialogCount);

}

/**

 * Returns the currently selected color in the receiver.

 *

 * @return the RGB value for the selected color, may be null

 *

 * @see PaletteData#getRGBs

 */

public RGB getRGB () {

    return rgb;

}

/**

 * Makes the receiver visible and brings it to the front

 * of the display.

 *

 * @return the selected color, or null if the dialog was

 *         cancelled, no color was selected, or an error

 *         occurred

 *

 * @exception SWTException <ul>

 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>

 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>

 * </ul>

 */

public RGB open () {

   int colorHandle = 0;

   colorHandle = OS.QColor_new();

   if (rgb != null ){

       OS.QColor_setRed(colorHandle, rgb.red);

       OS.QColor_setGreen(colorHandle, rgb.green);

       OS.QColor_setBlue(colorHandle, rgb.blue);

   }

   DisposeListener listener = new DisposeListener() {

       public void widgetDisposed(DisposeEvent e) {

           if (e.widget == parent) {

               // Close dialogs which are opened on top of parent.

               OS.QDialog_swt_closeDialogs(parent.handle, dialogID);

           }

       }

   };

   parent.addDisposeListener(listener);

   int qtLayoutDirection = (style & SWT.RIGHT_TO_LEFT) != 0 ? OS.QT_RIGHTTOLEFT

           : OS.QT_LEFTTORIGHT;

   int color = OS.QColorDialog_getColor( colorHandle,parent.handle, dialogID, qtLayoutDirection );

   if (parent != null && !parent.isDisposed()) {

       parent.removeDisposeListener(listener);

   }

   OS.QColor_delete( colorHandle );

   if (color == 0 || !OS.QColor_isValid(color) ){

       return null;

   }

   int red = OS.QColor_red(color);    

   int blue = OS.QColor_blue( color );

   int green = OS.QColor_green( color );

   rgb = new RGB(red,green,blue);

   return rgb;

}

/**

 * Sets the receiver's selected color to be the argument.

 *

 * @param rgb the new RGB value for the selected color, may be

 *        null to let the platform select a default when

 *        open() is called

 * @see PaletteData#getRGBs

 */

public void setRGB (RGB rgb) {

    this.rgb = rgb;

}

}