/*******************************************************************************
 * Copyright (c) 2000, 2011 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.swt.widgets;

 
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.cocoa.*;

/**
 * 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 <em>not</em> intended to be subclassed.
 * </p>
 * 
 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample, Dialog tab</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 * @noextend This class is not intended to be subclassed by clients.
 */
public class FontDialog extends Dialog {
	FontData fontData;
	RGB rgb;
	boolean selected;
	int fontID, fontSize;
	boolean effectsVisible = true;

/**
 * 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.APPLICATION_MODAL);
}

/**
 * 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, checkStyle (parent, style));
	checkSubclass ();
}

void changeFont(int /*long*/ id, int /*long*/ sel, int /*long*/ arg0) {
	selected = true;
}

/**
 * Returns <code>true</code> if the dialog's effects selection controls
 * are visible, and <code>false</code> otherwise.
 * <p>
 * If the platform's font dialog does not have any effects selection controls,
 * then this method always returns false.
 * </p> 
 *
 * @return <code>true</code> if the dialog's effects selection controls
 * are visible and <code>false</code> otherwise
 * 
 * @since 3.8
 */
public boolean getEffectsVisible () {
	return effectsVisible;
}

/**
 * Returns a FontData object describing the font that was
 * selected in the dialog, or null if none is available.
 * 
 * @return the FontData for the selected font, or null
 * @deprecated use #getFontList ()
 */
public FontData getFontData () {
	return fontData;
}

/**
 * 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 () {
	Display display = parent != null ? parent.display : Display.getCurrent ();	
	NSFontPanel panel = NSFontPanel.sharedFontPanel();
	panel.setTitle(NSString.stringWith(title != null ? title : ""));
	boolean create = fontData != null;
	Font font = create ? new Font(display, fontData) : display.getSystemFont();
	panel.setPanelFont(font.handle, false);
	SWTPanelDelegate delegate = (SWTPanelDelegate)new SWTPanelDelegate().alloc().init();
	int /*long*/ jniRef = OS.NewGlobalRef(this);
	if (jniRef == 0) error(SWT.ERROR_NO_HANDLES);
	OS.object_setInstanceVariable(delegate.id, Display.SWT_OBJECT, jniRef);
	panel.setDelegate(delegate);
	fontData = null;
	selected = false;
	panel.orderFront(null);
	display.setModalDialog(this);
	NSApplication.sharedApplication().runModalForWindow(panel);
	display.setModalDialog(null);
	if (selected) {
		NSFont nsFont = panel.panelConvertFont(font.handle);
		if (nsFont != null) {
			fontData = Font.cocoa_new(display, nsFont).getFontData()[0];
		}
	}
	panel.setDelegate(null);
	delegate.release();
	OS.DeleteGlobalRef(jniRef);
	if (create) font.dispose();
	return fontData;
}

void setColor_forAttribute(int /*long*/ id, int /*long*/ sel, int /*long*/ colorArg, int /*long*/ attribute) {
	if (attribute != 0 && NSString.stringWith("NSColor").isEqualToString(new NSString(attribute))) { //$NON-NLS-1$
		if (colorArg != 0) {
			NSColor color = new NSColor(colorArg);
			Display display = parent != null ? parent.getDisplay() : Display.getCurrent();
			float /*double*/ [] handle = display.getNSColorRGB(color);
			rgb = new RGB((int)(handle[0] * 255), (int)(handle[1] * 255), (int)(handle[2] * 255));
		} else {
			rgb = null;
		}
	}
}

/**
 * Sets the effects selection controls in the dialog visible if the
 * argument is <code>true</code>, and invisible otherwise.
 * <p>
 * By default the effects selection controls are displayed if the
 * platform font dialog supports effects selection.
 * </p>
 *
 * @param visible whether or not the dialog will show the effects selection controls
 * 
 * @since 3.8
 */
public void setEffectsVisible(boolean visible) {
	effectsVisible = visible;
}

/**
 * Sets a FontData object describing the font to be
 * selected by default in the dialog, or null to let
 * the platform choose one.
 * 
 * @param fontData the FontData to use initially, or null
 * @deprecated use #setFontList (FontData [])
 */
public void setFontData (FontData fontData) {
	this.fontData = fontData;
}

/**
 * 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;
}

int validModesForFontPanel(int /*long*/ id, int /*long*/ sel, int /*long*/ arg0) {
	return effectsVisible ? OS.NSFontPanelAllModesMask : OS.NSFontPanelAllModesMask & ~OS.NSFontPanelAllEffectsModeMask;
}

void windowWillClose(int /*long*/ id, int /*long*/ sel, int /*long*/ sender) {
	NSApplication.sharedApplication().stop(null);
}

}