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

 * 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.SWT;

import org.eclipse.swt.events.DisposeEvent;

import org.eclipse.swt.events.DisposeListener;

import org.eclipse.swt.graphics.Font;

import org.eclipse.swt.graphics.FontData;

import org.eclipse.swt.graphics.RGB;

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

/**

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

 * from all available fonts in the system.

 * <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 FontDialog extends Dialog {

    FontData fontData;

    RGB rgb;

	String dialogID;

	static int dialogCount;

/**

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

 *

 * @param parent a shell 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>

 */

public FontDialog (Shell parent) {

    this (parent, SWT.PRIMARY_MODAL);

	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 shell which will be the parent of the new instance

 * @param style the style of dialog 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>

 */

public FontDialog (Shell parent, int style) {

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

    checkSubclass ();

	dialogCount++;

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

}

/**

 * Returns a FontData set describing the font that was

 * selected in the dialog, or null if none is available.

 * 

 * @return the FontData for the selected font, or null

 * @since 2.1.1

 */

public FontData [] getFontList () {

    if (fontData == null) return null;

    FontData [] result = new FontData [1];

    result [0] = fontData;

    return result;

}

/**

 * Returns an RGB describing the color that was selected

 * in the dialog, or null if none is available.

 *

 * @return the RGB value for the selected color, or null

 *

 * @see PaletteData#getRGBs

 * 

 * @since 2.1

 */

public RGB getRGB () {

    return rgb;

}

/**

 * Makes the dialog visible and brings it to the front

 * of the display.

 *

 * @return a FontData object describing the font that was selected,

 *         or null if the dialog was cancelled or an error occurred

 *

 * @exception SWTException <ul>

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

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

 * </ul>

 */

public FontData open () {

    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);

    String family = "";

    boolean italic = false;

    int weight = OS.QT_FONTNORMAL;

    int height = -1;

    if (fontData != null) {

        family = fontData.getName();

        height = fontData.getHeight();

        italic = (fontData.getStyle() & SWT.ITALIC) != 0;

        if ((fontData.getStyle() & SWT.BOLD) != 0) weight = OS.QT_FONTBOLD;

    }

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

            : OS.QT_LEFTTORIGHT;

    int fontHandle = OS.QFontDialog_swt_getFont(parent.handle, title, family, 

                                                height, weight, italic, dialogID, qtLayoutDirection);

    boolean accepted = (fontHandle != 0); 

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

        parent.removeDisposeListener(listener);

    }

    if (accepted) {

        int style = SWT.NORMAL;

        if (OS.QFont_weight(fontHandle) > OS.QT_FONTNORMAL) style |= SWT.BOLD;

        if (OS.QFont_italic(fontHandle)) style |= SWT.ITALIC;

        fontData = new FontData(OS.QFont_family(fontHandle),

                                OS.QFont_pointSize(fontHandle),

                                style);

        OS.QFont_delete(fontHandle);

    } 

    return accepted ? fontData : null;

}

/**

 * Sets the set of FontData objects describing the font to

 * be selected by default in the dialog, or null to let

 * the platform choose one.

 * 

 * @param fontData the set of FontData objects to use initially, or null

 *        to let the platform select a default when open() is called

 *

 * @see Font#getFontData

 * 

 * @since 2.1.1

 */

public void setFontList (FontData [] fontData) {

    if (fontData != null && fontData.length > 0) {

        this.fontData = fontData [0];

    } else {

        this.fontData = null;

    }

}

/**

 * Sets the RGB describing the color to be selected by default

 * in the dialog, or null to let the platform choose one.

 *

 * @param rgb the RGB value to use initially, or null to let

 *        the platform select a default when open() is called

 *

 * @see PaletteData#getRGBs

 * 

 * @since 2.1

 */

public void setRGB (RGB rgb) {

    this.rgb = rgb;

}

}