/*******************************************************************************
 * Copyright (c) 2006 Sybase, Inc. 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:
 *     Sybase, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.pagedesigner.ui.dialogs;

import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.wst.css.core.internal.util.declaration.CSSPropertyContext;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMElement;

/**
 * @author mengbo
 * @version 1.5
 */
public class ExtensionsPreferencePage extends PreferencePage {
	private CSSPropertyContext _style;

	private StyleCombo _beforeCombo, _afterCombo, _cursorCombo;

	/**
	 * Creates an instance.
	 * 
	 * @param element IDOMElement instance.
	 * @param style CSSPropertyContext instance.
	 */
	public ExtensionsPreferencePage(IDOMElement element,
			CSSPropertyContext style) {
		super();
		_style = style;

		setTitle(DialogsMessages.getString("ExtensionsPreferencePage.Title")); //$NON-NLS-1$
	}

	/**
	 * @see org.eclipse.jface.preference.
	 *      PreferencePage#createContents(Composite)
	 */
	protected Control createContents(Composite parent) {
		GridLayout layout;
		GridData data;

		Composite top = new Composite(parent, SWT.NONE);
		layout = new GridLayout(1, false);
		data = new GridData(GridData.FILL_BOTH);
		top.setLayout(layout);
		top.setLayoutData(data);

		Group pageGroup = new Group(top, SWT.NONE);
		pageGroup.setText(DialogsMessages
				.getString("ExtensionsPreferencePage.PageBreak")); //$NON-NLS-1$
		data = new GridData(GridData.FILL_HORIZONTAL);
		pageGroup.setLayoutData(data);
		layout = new GridLayout(2, false);
		pageGroup.setLayout(layout);

		Label beforeLabel = new Label(pageGroup, SWT.NONE);
		beforeLabel.setText(DialogsMessages
				.getString("ExtensionsPreferencePage.Before")); //$NON-NLS-1$
		data = new GridData(GridData.HORIZONTAL_ALIGN_END);
		beforeLabel.setLayoutData(data);

		_beforeCombo = new StyleCombo(pageGroup, SWT.NONE);
		_beforeCombo.setItems(IStyleConstants.PAGE_BREAK);
		data = new GridData(GridData.FILL_HORIZONTAL);
		_beforeCombo.setLayoutData(data);
		_beforeCombo.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				String page = _beforeCombo.getText();
				_style.setPageBreakBefore(page);
			}
		});

		Label afterLabel = new Label(pageGroup, SWT.NONE);
		afterLabel.setText(DialogsMessages
				.getString("ExtensionsPreferencePage.After")); //$NON-NLS-1$
		data = new GridData(GridData.HORIZONTAL_ALIGN_END);
		afterLabel.setLayoutData(data);

		_afterCombo = new StyleCombo(pageGroup, SWT.NONE);
		_afterCombo.setItems(IStyleConstants.PAGE_BREAK);
		data = new GridData(GridData.FILL_HORIZONTAL);
		_afterCombo.setLayoutData(data);
		_afterCombo.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				String page = _afterCombo.getText();
				_style.setPageBreakAfter(page);
			}
		});

		Group visualGroup = new Group(top, SWT.NONE);
		visualGroup.setText(DialogsMessages
				.getString("ExtensionsPreferencePage.VisualEffect")); //$NON-NLS-1$
		data = new GridData(GridData.FILL_HORIZONTAL);
		visualGroup.setLayoutData(data);
		layout = new GridLayout(2, false);
		visualGroup.setLayout(layout);

		Label cursorLabel = new Label(visualGroup, SWT.NONE);
		cursorLabel.setText(DialogsMessages
				.getString("ExtensionsPreferencePage.Cursor")); //$NON-NLS-1$
		data = new GridData(GridData.HORIZONTAL_ALIGN_END);
		cursorLabel.setLayoutData(data);

		_cursorCombo = new StyleCombo(visualGroup, SWT.NONE);
		_cursorCombo.setItems(IStyleConstants.CURSOR);
		data = new GridData(GridData.FILL_HORIZONTAL);
		_cursorCombo.setLayoutData(data);
		_cursorCombo.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				String cursor = _cursorCombo.getText();
				_style.setCursor(cursor);
			}
		});

		initializeControls();

		return top;
	}

	private void initializeControls() {
		// page-break-before
		String page = _style.getPageBreakBefore();
		if (!isEmptyString(page)) {
			int index = _beforeCombo.indexOf(page);
			if (index != -1) {
				_beforeCombo.select(index);
			} else {
				_beforeCombo.setText(page);
			}
		}

		// page-break-after
		page = _style.getPageBreakAfter();
		if (!isEmptyString(page)) {
			int index = _afterCombo.indexOf(page);
			if (index != -1) {
				_afterCombo.select(index);
			} else {
				_afterCombo.setText(page);
			}
		}

		// cursor
		String cursor = _style.getCursor();
		if (!isEmptyString(cursor)) {
			int index = _cursorCombo.indexOf(cursor);
			if (index != -1) {
				_cursorCombo.select(index);
			} else {
				_cursorCombo.setText(cursor);
			}
		}
	}

	public void setVisible(boolean visible) {
		super.setVisible(visible);

		getApplyButton().setVisible(false);
		getDefaultsButton().setVisible(false);
	}

	private boolean isEmptyString(String str) {
		if (str == null || str.length() == 0) {
			return true;
		}
        return false;
	}
}