org.eclipse.jface.snippets.viewers.Snippet045TableViewerFillFromBackgroundThread.java Source code

Introduction

Here is the source code for org.eclipse.jface.snippets.viewers.Snippet045TableViewerFillFromBackgroundThread.java

Source

/*******************************************************************************
 * Copyright (c) 2006, 2018 Tom Schindl and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Tom Schindl - initial API and implementation
 *     Jeanderson Candido <http://jeandersonbc.github.io> - Bug 414565
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 475361
 *******************************************************************************/

package org.eclipse.jface.snippets.viewers;

import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

import org.eclipse.jface.resource.FontRegistry;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ITableColorProvider;
import org.eclipse.jface.viewers.ITableFontProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableColumn;

/**
 * Example how to fill a {@link TableViewer} from the background without
 * blocking the UI
 *
 * @author Tom Schindl &lt;tom.schindl@bestsolution.at&gt;
 *
 */
public class Snippet045TableViewerFillFromBackgroundThread {
    private static int COUNTER = 0;

    public class MyModel {
        public int counter;

        public MyModel(int counter) {
            this.counter = counter;
        }

        @Override
        public String toString() {
            return "Item " + this.counter;
        }
    }

    public class MyLabelProvider extends LabelProvider
            implements ITableLabelProvider, ITableFontProvider, ITableColorProvider {
        FontRegistry registry = new FontRegistry();

        @Override
        public Image getColumnImage(Object element, int columnIndex) {
            return null;
        }

        @Override
        public String getColumnText(Object element, int columnIndex) {
            MyModel m = (MyModel) element;
            if (m.counter == 0) {
                return "Column " + columnIndex + " => " + "Initial input";
            }
            return "Column " + columnIndex + " => thread added " + element;
        }

        @Override
        public Font getFont(Object element, int columnIndex) {
            if (((MyModel) element).counter % 2 == 0) {
                return registry.getBold(Display.getCurrent().getSystemFont().getFontData()[0].getName());
            }
            return null;
        }

        @Override
        public Color getBackground(Object element, int columnIndex) {
            if (((MyModel) element).counter % 2 == 0) {
                return Display.getCurrent().getSystemColor(SWT.COLOR_RED);
            }
            return null;
        }

        @Override
        public Color getForeground(Object element, int columnIndex) {
            if (((MyModel) element).counter % 2 == 1) {
                return Display.getCurrent().getSystemColor(SWT.COLOR_RED);
            }
            return null;
        }

    }

    public Snippet045TableViewerFillFromBackgroundThread(final Shell shell) {
        final TableViewer v = new TableViewer(shell, SWT.BORDER | SWT.FULL_SELECTION);
        v.setLabelProvider(new MyLabelProvider());
        v.setContentProvider(ArrayContentProvider.getInstance());

        TableColumn column = new TableColumn(v.getTable(), SWT.NONE);
        column.setWidth(200);
        column.setText("Column 1");

        column = new TableColumn(v.getTable(), SWT.NONE);
        column.setWidth(200);
        column.setText("Column 2");

        final List<MyModel> model = new ArrayList<>();
        model.add(new MyModel(0));
        model.add(new MyModel(0));
        model.add(new MyModel(0));
        v.setInput(model);
        v.setComparator(new ViewerComparator() {
            @Override
            public int compare(Viewer viewer, Object e1, Object e2) {
                MyModel m1 = (MyModel) e1;
                MyModel m2 = (MyModel) e2;
                return m2.counter - m1.counter;
            }

        });
        v.getTable().setLinesVisible(true);
        v.getTable().setHeaderVisible(true);

        TimerTask task = new TimerTask() {

            @Override
            public void run() {
                shell.getDisplay().syncExec(() -> {
                    MyModel el = new MyModel(++COUNTER);
                    v.add(el);
                    model.add(el);
                });
            }
        };

        Timer timer = new Timer(true);
        timer.scheduleAtFixedRate(task, 3000, 1000);
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        Display display = new Display();

        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        new Snippet045TableViewerFillFromBackgroundThread(shell);
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }

}