net.sf.logsaw.ui.wizards.DialectWizardPage.java Source code

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Here is the source code for net.sf.logsaw.ui.wizards.DialectWizardPage.java

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/*******************************************************************************
 * Copyright (c) 2010, 2011 LogSaw project 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:
 *    LogSaw project committers - initial API and implementation
 *******************************************************************************/
package net.sf.logsaw.ui.wizards;

import java.util.Collection;

import net.sf.logsaw.core.dialect.ILogDialect;
import net.sf.logsaw.core.dialect.ILogDialectFactory;
import net.sf.logsaw.ui.IHelpContexts;
import net.sf.logsaw.ui.Messages;

import org.eclipse.core.databinding.beans.PojoProperties;
import org.eclipse.core.databinding.observable.list.WritableList;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.databinding.viewers.ViewerSupport;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;

/**
 * @author Philipp Nanz
 */
public class DialectWizardPage extends WizardPage {

    private Collection<ILogDialectFactory> dialectFactories;
    private TableViewer tableViewer;
    private Text detailsText;
    private String[] columnNames = new String[] { "Name", "Bundle ID" }; //$NON-NLS-1$ //$NON-NLS-2$
    private String[] columnProperties = new String[] { "name", "contributor" }; //$NON-NLS-1$ //$NON-NLS-2$

    /**
     * Constructor.
     * @param dialectFactories the dialect factories available
     */
    public DialectWizardPage(Collection<ILogDialectFactory> dialectFactories) {
        super("selectDialect", Messages.DialectWizardPage_title, null); //$NON-NLS-1$
        Assert.isNotNull(dialectFactories, "dialectFactories"); //$NON-NLS-1$
        this.dialectFactories = dialectFactories;
        setDescription(Messages.DialectWizardPage_description);
        setPageComplete(false);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.dialogs.IDialogPage#createControl(org.eclipse.swt.widgets.Composite)
     */
    @Override
    public void createControl(Composite parent) {
        Composite root = new Composite(parent, SWT.NONE);
        root.setLayout(new GridLayout(1, false));

        tableViewer = new TableViewer(root,
                SWT.BORDER | SWT.SINGLE | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION);
        tableViewer.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
        tableViewer.addSelectionChangedListener(new ISelectionChangedListener() {

            /* (non-Javadoc)
             * @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
             */
            @Override
            public void selectionChanged(SelectionChangedEvent event) {
                IStructuredSelection sel = (IStructuredSelection) event.getSelection();
                if (sel.isEmpty()) {
                    detailsText.setText(""); //$NON-NLS-1$
                    setPageComplete(false);
                } else {
                    ILogDialectFactory dialect = (ILogDialectFactory) sel.getFirstElement();
                    detailsText.setText(dialect.getDescription() != null ? dialect.getDescription() : ""); //$NON-NLS-1$
                    setPageComplete(true);
                }
            }
        });
        tableViewer.setComparator(new ViewerComparator());
        tableViewer.getTable().setHeaderVisible(true);
        tableViewer.getTable().setLinesVisible(true);

        // Setup columns
        for (String columnName : columnNames) {
            TableColumn col = new TableColumn(tableViewer.getTable(), SWT.NONE);
            col.setText(columnName);
        }

        // Setup data binding
        ViewerSupport.bind(tableViewer, new WritableList(dialectFactories, ILogDialect.class),
                PojoProperties.values(columnProperties));

        for (TableColumn col : tableViewer.getTable().getColumns()) {
            col.pack();
        }

        Group group = new Group(root, SWT.NONE);
        group.setText(Messages.DialectWizardPage_label_details);
        group.setLayoutData(new GridData(SWT.FILL, SWT.NONE, true, false));
        group.setLayout(new GridLayout());

        detailsText = new Text(group, SWT.BORDER | SWT.MULTI | SWT.READ_ONLY | SWT.V_SCROLL | SWT.WRAP);
        GC gc = new GC(detailsText);
        FontMetrics fm = gc.getFontMetrics();
        gc.dispose();
        int cols = 80;
        int rows = 3;
        int width = cols * fm.getAverageCharWidth();
        int height = rows * fm.getHeight();
        GridData gridData = new GridData(SWT.FILL, SWT.NONE, true, false);
        gridData.widthHint = width;
        gridData.heightHint = height;
        detailsText.setLayoutData(gridData);

        setControl(root);

        // Bind help context
        PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), IHelpContexts.DIALECT_WIZARD_PAGE);
    }

    /**
     * Returns the selected log dialect factory.
     * @return the selected log dialect factory
     */
    public ILogDialectFactory getSelectedDialectFactory() {
        IStructuredSelection sel = (IStructuredSelection) tableViewer.getSelection();
        return (ILogDialectFactory) sel.getFirstElement();
    }
}