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/*******************************************************************************
* 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
* Simon Scholz <simon.scholz@vogella.com> - Bug 442343
* Lars Vogel <Lars.Vogel@gmail.com> - Bug 510301
*******************************************************************************/
package org.eclipse.jface.snippets.viewers;
import java.util.Random;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableColumn;
/**
* Example how to update a viewer from a long running task
*
* @author Tom Schindl <tom.schindl@bestsolution.at>
*
*/
public class Snippet046UpdateViewerFromBackgroundThread {
private static Image[] images;
public static class MyModel {
public int counter;
public boolean finished;
public MyModel(int counter) {
this.counter = counter;
}
@Override
public String toString() {
return "Item " + this.counter;
}
}
public static class MyLabelProvider extends LabelProvider implements ITableLabelProvider {
@Override
public Image getColumnImage(Object element, int columnIndex) {
if (columnIndex == 0) {
return images[((MyModel) element).finished ? 0 : 1];
}
return null;
}
@Override
public String getColumnText(Object element, int columnIndex) {
return "Column " + columnIndex + " => " + element;
}
}
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 Snippet046UpdateViewerFromBackgroundThread(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 MyModel[] model = createModel();
v.setInput(model);
v.getTable().setLinesVisible(true);
v.getTable().setHeaderVisible(true);
Button b = new Button(shell, SWT.PUSH);
b.setText("Start Long Task");
b.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
b.setText("Update running..");
b.setEnabled(false);
final Thread t = new Thread() {
@Override
public void run() {
for (int i = 0; i < model.length; i++) {
if (v.getTable().isDisposed()) {
return;
}
final int j = i;
v.getTable().getDisplay().asyncExec(() -> {
if (model[j].finished) {
model[j].finished = false;
} else {
model[j].finished = true;
}
v.update(model[j], null);
});
try {
Thread.sleep(new Random().nextInt(1000) + 100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
v.getTable().getDisplay().asyncExec(() -> {
b.setText("Start Long Task");
b.setEnabled(true);
});
}
};
t.start();
}
});
}
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[2];
images[0] = createImage(display, 0, 255, 0);
images[1] = createImage(display, 255, 0, 0);
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
new Snippet046UpdateViewerFromBackgroundThread(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
for (Image image : images) {
image.dispose();
}
display.dispose();
}
}
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