org.eclipse.e4.tools.preference.spy.handler.ToggleLayoutControl.java Source code

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Here is the source code for org.eclipse.e4.tools.preference.spy.handler.ToggleLayoutControl.java

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/*******************************************************************************
 * Copyright (c) 2015 vogella GmbH.
 * 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:
 *     Simon Scholz <simon.scholz@vogella.com> - initial API and implementation
 *******************************************************************************/
package org.eclipse.e4.tools.preference.spy.handler;

import java.net.URL;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.inject.Inject;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.e4.core.di.extensions.Preference;
import org.eclipse.e4.core.services.log.Logger;
import org.eclipse.e4.tools.preference.spy.constants.PreferenceConstants;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.LocalResourceManager;
import org.eclipse.jface.resource.ResourceManager;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;
import org.osgi.framework.Bundle;
import org.osgi.framework.FrameworkUtil;
import org.osgi.service.prefs.BackingStoreException;

@SuppressWarnings("restriction")
public class ToggleLayoutControl {

    @Inject
    Logger LOG;

    private ToolItem toolItem;
    private ResourceManager resourceManager;

    @Inject
    public void tracePreferenceChanged(
            @Preference(value = PreferenceConstants.HIERARCHICAL_LAYOUT) boolean hierarchicalLayoutPreference) {
        if (toolItem != null && !toolItem.isDisposed()) {
            toolItem.setSelection(hierarchicalLayoutPreference);
            toolItem.setImage(hierarchicalLayoutPreference
                    ? getResourceManager().createImage(getHierarchicalImageDescriptor())
                    : getResourceManager().createImage(getFlatImageDescriptor()));
            toolItem.setToolTipText(
                    hierarchicalLayoutPreference ? "Toogle to flat layout" : "Toggle to hierarchical layout");
        }
    }

    @PostConstruct
    public void createGui(Composite parent, final @Preference IEclipsePreferences preferences,
            @Preference(value = PreferenceConstants.HIERARCHICAL_LAYOUT) boolean hierarchicalLayoutPreference) {
        ToolBar toolBar = new ToolBar(parent, SWT.NONE);
        toolItem = new ToolItem(toolBar, SWT.CHECK);
        toolItem.setToolTipText(
                hierarchicalLayoutPreference ? "Toogle to flat layout" : "Toggle to hierarchical layout");
        toolItem.addSelectionListener(new SelectionAdapter() {

            @Override
            public void widgetSelected(SelectionEvent event) {
                Object source = event.getSource();
                if (source instanceof ToolItem) {
                    preferences.putBoolean(PreferenceConstants.HIERARCHICAL_LAYOUT,
                            ((ToolItem) source).getSelection());
                    try {
                        preferences.flush();
                    } catch (BackingStoreException e) {
                        LOG.error(e);
                    }
                }
            }
        });
        tracePreferenceChanged(hierarchicalLayoutPreference);
    }

    @PreDestroy
    public void dispose() {
        if (resourceManager != null) {
            resourceManager.dispose();
        }
    }

    protected ResourceManager getResourceManager() {
        if (null == resourceManager) {
            resourceManager = new LocalResourceManager(JFaceResources.getResources());
        }
        return resourceManager;
    }

    protected ImageDescriptor getFlatImageDescriptor() {
        Bundle bundle = FrameworkUtil.getBundle(getClass());
        URL url = FileLocator.find(bundle, new Path("icons/flatLayout.png"), null);
        return ImageDescriptor.createFromURL(url);
    }

    protected ImageDescriptor getHierarchicalImageDescriptor() {
        Bundle bundle = FrameworkUtil.getBundle(getClass());
        URL url = FileLocator.find(bundle, new Path("icons/hierarchicalLayout.png"), null);
        return ImageDescriptor.createFromURL(url);
    }
}