org.eclipse.jface.snippets.viewers.Snippet051TableCenteredImage.java Source code

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Here is the source code for org.eclipse.jface.snippets.viewers.Snippet051TableCenteredImage.java

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/*******************************************************************************
 * Copyright (c) 2006, 2016 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
 *     Simon Scholz <simon.scholz@vogella.com> - Bug 442343
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 510301
 *     Wim Jongman <wim.jongman@remainsoftware.com> - Added a cool barcode
 *******************************************************************************/

package org.eclipse.jface.snippets.viewers;

import java.util.Random;

import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.jface.viewers.OwnerDrawLabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableItem;

/**
 * Example showing how to centre an image and use graphics using an owner draw
 * label provider
 *
 */
public class Snippet051TableCenteredImage {
    private static Image[] images;

    private abstract class CenterImageLabelProvider extends OwnerDrawLabelProvider {

        @Override
        protected void measure(Event event, Object element) {
        }

        @Override
        protected void paint(Event event, Object element) {

            Image img = getImage(element);

            if (img != null) {
                Rectangle bounds = ((TableItem) event.item).getBounds(event.index);
                Rectangle imgBounds = img.getBounds();
                bounds.width /= 2;
                bounds.width -= imgBounds.width / 2;
                bounds.height /= 2;
                bounds.height -= imgBounds.height / 2;

                int x = bounds.width > 0 ? bounds.x + bounds.width : bounds.x;
                int y = bounds.height > 0 ? bounds.y + bounds.height : bounds.y;

                event.gc.drawImage(img, x, y);
            } else {
                Rectangle bounds = ((TableItem) event.item).getBounds(event.index);
                for (int i = 0; i < bounds.width; i += 4) {
                    int width = new Random().nextInt(4) + 1;
                    event.gc.setForeground(event.display.getSystemColor(SWT.COLOR_BLACK));
                    event.gc.setLineWidth(width);
                    event.gc.drawLine(bounds.x + i, bounds.y, bounds.x + i, bounds.y + bounds.height);
                }
            }
        }

        protected abstract Image getImage(Object element);
    }

    public class MyModel {
        public int counter;

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

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

    private static Image createImage(Display display, int red, int green, int blue) {
        Color color = new Color(display, red, green, blue);
        Image image = new Image(display, 10, 10);
        GC gc = new GC(image);
        gc.setBackground(color);
        gc.fillRectangle(0, 0, 10, 10);
        gc.dispose();

        return image;
    }

    public Snippet051TableCenteredImage(Shell shell) {
        final TableViewer v = new TableViewer(shell, SWT.BORDER | SWT.FULL_SELECTION);
        v.setContentProvider(ArrayContentProvider.getInstance());

        TableViewerColumn column = new TableViewerColumn(v, SWT.NONE);
        column.getColumn().setWidth(200);
        column.getColumn().setText("Column 1");
        column.setLabelProvider(new ColumnLabelProvider() {

            @Override
            public String getText(Object element) {
                return "Column 1 => " + element + ((((MyModel) element).counter % 2 != 0) ? " barcode" : "");
            }
        });

        column = new TableViewerColumn(v, SWT.NONE);
        column.getColumn().setWidth(200);
        column.getColumn().setText("Column 2");
        column.setLabelProvider(new CenterImageLabelProvider() {

            @Override
            protected Image getImage(Object element) {
                if (((MyModel) element).counter % 2 == 0) {
                    return images[((MyModel) element).counter / 2 % 4];
                }
                return null;
            }

        });

        // OwnerDrawLabelProvider.setUpOwnerDraw(v);

        MyModel[] model = createModel();
        v.setInput(model);
        v.getTable().setLinesVisible(true);
        v.getTable().setHeaderVisible(true);
    }

    private MyModel[] createModel() {
        MyModel[] elements = new MyModel[10];

        for (int i = 0; i < 10; i++) {
            elements[i] = new MyModel(i);
        }

        return elements;
    }

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

        images = new Image[4];
        images[0] = createImage(display, 0, 0, 255);
        images[1] = createImage(display, 0, 255, 255);
        images[2] = createImage(display, 0, 255, 0);
        images[3] = createImage(display, 255, 0, 255);

        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        new Snippet051TableCenteredImage(shell);
        shell.open();

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

        for (Image image : images) {
            image.dispose();
        }

        display.dispose();

    }

}