Created
November 14, 2011 15:56
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package ch.jgraber.blog; | |
import org.eclipse.swt.SWT; | |
import org.eclipse.swt.events.SelectionAdapter; | |
import org.eclipse.swt.events.SelectionEvent; | |
import org.eclipse.swt.graphics.Point; | |
import org.eclipse.swt.layout.FillLayout; | |
import org.eclipse.swt.widgets.Button; | |
import org.eclipse.swt.widgets.Composite; | |
import org.eclipse.swt.widgets.Display; | |
import org.eclipse.swt.widgets.Event; | |
import org.eclipse.swt.widgets.Listener; | |
import org.eclipse.swt.widgets.ProgressBar; | |
import org.eclipse.swt.widgets.Shell; | |
/** | |
* Test Background Work for SWT based on tutorial on | |
* http://www.java2s.com/Code/JavaAPI | |
* /org.eclipse.swt.widgets/DisplayasyncExecRunnablerun.htm | |
* | |
* @author Johnny Graber | |
*/ | |
public class SwtBackgroundDemo { | |
/** | |
* @param args | |
*/ | |
public static void main(String[] args) { | |
final SwtBackgroundDemo window = new SwtBackgroundDemo(); | |
window.open(); | |
} | |
protected ProgressBar progress; | |
/** | |
* Open the window | |
*/ | |
public void open() { | |
final Display s_display = Display.getDefault(); | |
final Shell s_shell = new Shell(s_display); | |
s_shell.setSize(new Point(200, 200)); | |
s_shell.setText("BackgroundWork Test"); | |
s_shell.setLayout(new FillLayout()); | |
s_shell.addListener(SWT.Traverse, new Listener() { | |
public void handleEvent(Event event) { | |
if (event.detail == SWT.TRAVERSE_ESCAPE) | |
s_shell.dispose(); | |
} | |
}); | |
Composite s_composite = new Composite(s_shell, SWT.NONE); | |
s_composite.setLayout(new FillLayout(SWT.VERTICAL)); | |
final Button workButton = new Button(s_composite, SWT.FLAT); | |
workButton.setText("Bereit!"); | |
workButton.setLocation(new Point(0, 0)); | |
workButton.setSize(100, 50); | |
progress = new ProgressBar(s_composite, SWT.HORIZONTAL | SWT.SMOOTH); | |
workButton.addSelectionListener(new SelectionAdapter() { | |
public void widgetSelected(SelectionEvent arg0) { | |
progress.setSelection(0); | |
workButton.setEnabled(false); | |
new LongRunningOperation(s_display, progress, workButton) | |
.start(); | |
workButton.setText("SelectionListener beendet!"); | |
} | |
}); | |
final Button workButtonSlow = new Button(s_composite, SWT.FLAT); | |
workButtonSlow.setText("Bereit! [Blockiert]"); | |
workButtonSlow.setLocation(new Point(0, 0)); | |
workButtonSlow.setSize(100, 50); | |
workButtonSlow.addSelectionListener(new SelectionAdapter() { | |
public void widgetSelected(SelectionEvent arg0) { | |
progress.setSelection(0); | |
workButtonSlow.setEnabled(false); | |
// simuliert lange dauernde Aktion | |
for (int i = 0; i < 100; i++) { | |
try { | |
Thread.sleep(100); | |
} catch (InterruptedException e) { | |
System.out.println(e.getMessage()); | |
} | |
progress.setSelection(progress.getSelection() + 1); | |
} | |
workButtonSlow.setText("Thread beendet"); | |
workButtonSlow.setEnabled(true); | |
} | |
}); | |
s_shell.layout(); | |
s_shell.open(); | |
while (!s_shell.isDisposed()) { | |
if (!s_display.readAndDispatch()) | |
s_display.sleep(); | |
} | |
} | |
class LongRunningOperation extends Thread { | |
private Display display; | |
private ProgressBar progressBar; | |
private Button workButton; | |
/** | |
* Alles übergeben was aus diesem Thread erreichbar sein soll | |
*/ | |
public LongRunningOperation(Display display, ProgressBar progressBar, | |
Button workButton) { | |
this.display = display; | |
this.progressBar = progressBar; | |
this.workButton = workButton; | |
} | |
/** | |
* Länger laufende Methode um eine Verarbeitung zu simulieren | |
*/ | |
public void run() { | |
for (int i = 0; i < 100; i++) { | |
try { | |
Thread.sleep(100); | |
} catch (InterruptedException e) { | |
System.out.println(e.getMessage()); | |
} | |
progressBar.setSelection(progressBar.getSelection() + 1); | |
// ProgressBar kann nur via asyncExec aktualisiert werden! | |
display.asyncExec(new Runnable() { | |
public void run() { | |
if (progressBar.isDisposed()) | |
return; | |
progressBar.setSelection(progressBar.getSelection() + 1); | |
} | |
}); | |
} | |
// Gleiches gilt für alle GUI-Elemente | |
display.asyncExec(new Runnable() { | |
public void run() { | |
if (workButton.isDisposed()) | |
return; | |
workButton.setText("Thread beendet"); | |
workButton.setEnabled(true); | |
} | |
}); | |
} | |
} | |
} |
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