net.vectorcomputing.photo.ui.widgets.PhotoCatalogsList.java Source code

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Here is the source code for net.vectorcomputing.photo.ui.widgets.PhotoCatalogsList.java

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/*******************************************************************************
 * Copyright 2011 Lance Feagan
 * 
 * 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 net.vectorcomputing.photo.ui.widgets;

import net.vectorcomputing.photo.PhotoPlugin;
import net.vectorcomputing.photo.catalog.IPhotoCatalog;
import net.vectorcomputing.photo.catalog.IPhotoCatalogEvent;
import net.vectorcomputing.photo.catalog.IPhotoCatalogEventListener;
import net.vectorcomputing.photo.catalog.IPhotoCatalogs;

import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.TreeViewerColumn;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Tree;

public class PhotoCatalogsList extends Composite implements IPhotoCatalogEventListener {

    private TreeViewer viewer;
    private Tree tree;

    private final IPhotoCatalogs catalogs = PhotoPlugin.getCatalogs();

    public PhotoCatalogsList(Composite parent, int style) {
        super(parent, style | SWT.READ_ONLY);
        setLayout(new FillLayout());
        createComponents();
        viewer.setInput(catalogs);
        catalogs.addListener(this);
    }

    @Override
    protected void checkSubclass() {
        // Disable the check that prevents sub-classing of SWT components
    }

    private void createComponents() {
        viewer = new TreeViewer(this, SWT.SINGLE | SWT.V_SCROLL | SWT.H_SCROLL);
        viewer.setContentProvider(new PhotoCatalogsContentProvider());
        tree = viewer.getTree();
        createHeaders();
    }

    private void createHeaders() {
        String[] headers = { "Name", "# of records", "update start time" };
        int[] columnWidths = { 100, 100, 100 };
        for (int i = 0; i < headers.length; i++) {
            TreeViewerColumn column = new TreeViewerColumn(viewer, SWT.NONE);
            column.getColumn().setText(headers[i]);
            column.getColumn().setResizable(true);
            //column.getColumn().setMoveable(true);
            column.getColumn().setWidth(columnWidths[i]);
        }

        viewer.setLabelProvider(new PhotoCatalogsCellLabelProvider());

        tree.setHeaderVisible(true);
        tree.setLinesVisible(true);
    }

    public IPhotoCatalog getSelectedCatalog() {
        ITreeSelection selection = (ITreeSelection) viewer.getSelection();
        return (IPhotoCatalog) selection.getFirstElement();
    }

    public ISelectionProvider getViewer() {
        return viewer;
    }

    @Override
    public void dispose() {
        catalogs.removeListener(this);
        super.dispose();
    }

    @Override
    public void handle(IPhotoCatalogEvent event) {
        this.getDisplay().asyncExec(new CatalogEventHandler(event));
    }

    private final class CatalogEventHandler implements Runnable {

        private final IPhotoCatalogEvent event;

        public CatalogEventHandler(IPhotoCatalogEvent event) {
            this.event = event;
        }

        @Override
        public void run() {
            viewer.refresh();
        }

    }

}