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

 * Copyright (c) 2010 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.ui.internal.preferences;

import org.eclipse.e4.core.contexts.IEclipseContext;

import org.eclipse.e4.ui.css.swt.theme.ITheme;

import org.eclipse.e4.ui.css.swt.theme.IThemeEngine;

import org.eclipse.e4.ui.internal.workbench.swt.E4Application;

import org.eclipse.jface.preference.PreferencePage;

import org.eclipse.jface.viewers.ArrayContentProvider;

import org.eclipse.jface.viewers.ComboViewer;

import org.eclipse.jface.viewers.ISelectionChangedListener;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.LabelProvider;

import org.eclipse.jface.viewers.SelectionChangedEvent;

import org.eclipse.jface.viewers.StructuredSelection;

import org.eclipse.swt.SWT;

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.Label;

import org.eclipse.ui.IWorkbench;

import org.eclipse.ui.IWorkbenchPreferencePage;

/**

 * @since 3.5

 *

 */

public class CSSThemePreferencePage extends PreferencePage implements IWorkbenchPreferencePage {

	private IThemeEngine engine;

	private ComboViewer themeIdCombo;

	private ITheme currentTheme;

	private String defaultTheme;

	@Override

	protected Control createContents(Composite parent) {

		Composite comp = new Composite(parent, SWT.NONE);

		comp.setLayout(new GridLayout(2, false));

		new Label(comp, SWT.NONE).setText("ThemeId"); //$NON-NLS-1$

		themeIdCombo = new ComboViewer(comp, SWT.READ_ONLY);

		themeIdCombo.setLabelProvider(new LabelProvider() {

			@Override

			public String getText(Object element) {

				return ((ITheme) element).getLabel();

			}

		});

		themeIdCombo.setContentProvider(new ArrayContentProvider());

		themeIdCombo.setInput(engine.getThemes());

		themeIdCombo.getControl().setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

		this.currentTheme = engine.getActiveTheme();

		themeIdCombo.setSelection(new StructuredSelection(currentTheme));

		themeIdCombo.addSelectionChangedListener(new ISelectionChangedListener() {

			public void selectionChanged(SelectionChangedEvent event) {

				engine.setTheme(getSelection(),

						false);

			}

		});

		return comp;

	}

	private ITheme getSelection() {

		return (ITheme) ((IStructuredSelection) themeIdCombo.getSelection()).getFirstElement();

	}

	public void init(IWorkbench workbench) {

		IEclipseContext context = (IEclipseContext) workbench.getService(IEclipseContext.class);

		defaultTheme = (String) context.get(E4Application.THEME_ID);

		engine = context.get(IThemeEngine.class);

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see org.eclipse.jface.preference.PreferencePage#performOk()

	 */

	@Override

	public boolean performOk() {

		engine.setTheme(getSelection(), true);

		return super.performOk();

	}

	@Override

	protected void performDefaults() {

		engine.setTheme(defaultTheme, true);

		themeIdCombo.setSelection(new StructuredSelection(engine.getActiveTheme()));

		super.performDefaults();

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see org.eclipse.jface.preference.PreferencePage#performCancel()

	 */

	@Override

	public boolean performCancel() {

		engine.setTheme(currentTheme, false);

		return super.performCancel();

	}

}

page.name = CSS Theme

     <extension

           point="org.eclipse.ui.preferencePages">

        <page

              category="org.eclipse.ui.preferencePages.Views"

              class="org.eclipse.ui.internal.preferences.CSSThemePreferencePage"

              id="org.eclipse.ui.workbench.csstheme"

              name="%page.name">

        </page>

     </extension>