/*
 * AppleCommander - An Apple ][ image utility.
 * Copyright (C) 2002-2003 by Robert Greene
 * robgreene at users.sourceforge.net
 *
 * This program is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by the 
 * Free Software Foundation; either version 2 of the License, or (at your 
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along 
 * with this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package com.webcodepro.applecommander.ui.swt.util;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.printing.PrintDialog;
import org.eclipse.swt.printing.Printer;
import org.eclipse.swt.printing.PrinterData;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;

import com.webcodepro.applecommander.ui.UiBundle;
import com.webcodepro.applecommander.util.TextBundle;

/**
 * SWT-related utility code.
 * <p>
 * Date Created: Mar 5, 2003
 * @author Rob Greene
 */
public class SwtUtil {
	private static TextBundle textBundle = UiBundle.getInstance();
	
	/**
	 * Center the child shell within the parent shell window.
	 */
	public static void center(Shell parent, Shell child) {
		int x = parent.getLocation().x + 
			(parent.getSize().x - child.getSize().x) / 2;
		int y = parent.getLocation().y +
			(parent.getSize().y - child.getSize().y) / 2;
		if (x < 0) x = 0;
		if (y < 0) y = 0;
		child.setLocation(x,y);
	}

	/**
	 * Setup some sensible paging information.
	 */
	public static void setupPagingInformation(ScrolledComposite composite) {
		GC gc = new GC(composite);
		FontMetrics fontMetrics = gc.getFontMetrics();
		gc.dispose();
		int fontHeight = fontMetrics.getHeight();
		int fontWidth = fontMetrics.getAverageCharWidth();
		Rectangle clientArea = composite.getClientArea();
		int lines = clientArea.height / fontHeight;
		int pageHeight = lines * fontHeight;
		int pageWidth = clientArea.width - fontWidth; 
		composite.getVerticalBar().setIncrement(fontHeight);
		composite.getVerticalBar().setPageIncrement(pageHeight);
		composite.getHorizontalBar().setIncrement(fontWidth);
		composite.getHorizontalBar().setPageIncrement(pageWidth);
	}
	
	/**
	 * Display the Print dialog helper method. 
	 */
	public static Printer showPrintDialog(Control control) {
		PrintDialog dialog = new PrintDialog(control.getShell());
		PrinterData printerData = dialog.open();
		if (printerData == null) return null;
		return new Printer(printerData);
	}
	
	/**
	 * Display a dialog box with the question icon and a yes/no button selection.
	 */
	public static int showYesNoDialog(Shell shell, String title, String message) {
		MessageBox messageBox = new MessageBox(shell, SWT.ICON_QUESTION | SWT.YES | SWT.NO);
		messageBox.setText(title);
		messageBox.setMessage(message);
		return messageBox.open();
	}
	
	/**
	 * Display a dialog box with the error icon and a ok/cancel button selection.
	 */
	public static int showOkCancelErrorDialog(Shell shell, String title, String message) {
		MessageBox messageBox = new MessageBox(shell, SWT.ICON_ERROR | SWT.OK | SWT.CANCEL);
		messageBox.setText(title);
		messageBox.setMessage(message);
		return messageBox.open();
	}

	/**
	 * Display a dialog box with the error icon and only the ok button.
	 */
	public static void showErrorDialog(Shell shell, String title, String message) {
		MessageBox messageBox = new MessageBox(shell, SWT.ICON_ERROR | SWT.OK);
		messageBox.setText(title);
		messageBox.setMessage(message);
		messageBox.open();
	}

	/**
	 * Display a system-level error dialog box.
	 */
	public static void showSystemErrorDialog(Shell shell, Throwable throwable) {
		showErrorDialog(shell, textBundle.get("SystemErrorTitle"), //$NON-NLS-1$
			textBundle.format("SystemErrorMessage", throwable.getMessage())); //$NON-NLS-1$
	}
}