au.gov.ga.earthsci.application.handlers.ShowViewDialog.java Source code

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Here is the source code for au.gov.ga.earthsci.application.handlers.ShowViewDialog.java

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/*******************************************************************************
 * Copyright 2012 Geoscience Australia
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package au.gov.ga.earthsci.application.handlers;

import java.net.URI;
import java.util.Iterator;

import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.model.application.descriptor.basic.MPartDescriptor;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.ArrayContentProvider;
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.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;

/**
 * Dialog which lists the parts (or "Views") in this application, and allows the
 * user to select one or multiple.
 * 
 * @author Michael de Hoog (michael.dehoog@ga.gov.au)
 */
public class ShowViewDialog extends Dialog {
    private final MApplication application;
    private MPartDescriptor[] selection = new MPartDescriptor[] {};

    public ShowViewDialog(Shell parentShell, MApplication application) {
        super(parentShell);
        this.application = application;
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite composite = (Composite) super.createDialogArea(parent);
        composite.setLayout(new FillLayout());

        TableViewer viewer = new TableViewer(composite, SWT.NONE);
        viewer.setContentProvider(new ArrayContentProvider());
        viewer.setLabelProvider(new PartLabelProvider());

        //TODO this part collection is simply a list of parts that have been shown before
        //need to improve this collection so that it removes duplicates, and also contains
        //parts that are registered but have never been displayed
        viewer.setInput(application.getDescriptors());

        viewer.addSelectionChangedListener(new ISelectionChangedListener() {
            @Override
            public void selectionChanged(SelectionChangedEvent event) {
                IStructuredSelection s = (IStructuredSelection) event.getSelection();
                selection = new MPartDescriptor[s.size()];
                Iterator<?> iterator = s.iterator();
                for (int i = 0; iterator.hasNext(); i++) {
                    MPartDescriptor part = (MPartDescriptor) iterator.next();
                    selection[i++] = part;
                }
            }
        });

        return composite;
    }

    public MPartDescriptor[] getSelection() {
        return selection;
    }

    private class PartLabelProvider extends LabelProvider {
        @Override
        public String getText(Object element) {
            MPartDescriptor part = (MPartDescriptor) element;
            return part.getLabel();
        }

        @Override
        public Image getImage(Object element) {
            MPartDescriptor part = (MPartDescriptor) element;
            String uri = part.getIconURI();
            try {
                return ImageDescriptor.createFromURL(new URI(uri).toURL()).createImage();
            } catch (Exception e) {
                return null;
            }
        }
    }
}