Le Tutoriel de Java SWT ProgressBar
1. SWT ProgressBar
ProgressBar est un contrôle d'interface utilisateur qui permet de visualiser la progression de toutes les opérations dans vos applications SWT.
La figure ci-dessous illustre trois ProgressBar, deux premiers ProgressBar décrivent la progression du travail avec un volume défini. Le dernier ProgressBar décrit l'évolution du travail avec un volume indéfini.
ProgressBar vertical:
Les style peuvent être appliqués au ProgressBar:
- SMOOTH
- HORIZONTAL
- VERTICAL
- INDETERMINATE
// Horizontal ProgressBar
ProgressBar progressBar1 = new ProgressBar(shell, SWT.NULL);
ProgressBar progressBar2 = new ProgressBar(shell, SWT.SMOOTH);
ProgressBar progressBar3 = new ProgressBar(shell, SWT.INDETERMINATE);
// Vertical ProgressBar
ProgressBar progressBar4 = new ProgressBar(shell, SWT.VERTICAL | SWT.SMOOTH);
2. Exemple de SWT ProgressBar
Par exemple: Créez ProgressBar avec différents styles :
ProgressDemo.java
package org.o7planning.swt.progressbar;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;
public class ProgressBarDemo {
public ProgressBarDemo() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("SWT ProgressBar (o7planning.org)");
shell.setSize(450, 200);
ProgressBar progressBar1 = new ProgressBar(shell, SWT.NULL);
ProgressBar progressBar2 = new ProgressBar(shell, SWT.SMOOTH);
ProgressBar progressBar3 = new ProgressBar(shell, SWT.INDETERMINATE);
progressBar1.setMinimum(30);
progressBar1.setMaximum(250);
progressBar1.setSelection(160);
progressBar2.setMinimum(30);
progressBar2.setMaximum(250);
progressBar2.setSelection(200);
progressBar1.setBounds(140, 10, 200, 20);
progressBar2.setBounds(140, 40, 200, 20);
progressBar3.setBounds(140, 70, 200, 20);
Label label1 = new Label(shell, SWT.NULL);
label1.setText("(default)");
Label label2 = new Label(shell, SWT.NULL);
label2.setText("SWT.SMOOTH");
Label label3 = new Label(shell, SWT.NULL);
label3.setText("SWT.INDETERMINATE");
label1.setAlignment(SWT.RIGHT);
label2.setAlignment(SWT.RIGHT);
label3.setAlignment(SWT.RIGHT);
label1.setBounds(10, 10, 120, 20);
label2.setBounds(10, 40, 120, 20);
label3.setBounds(10, 70, 120, 20);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
public static void main(String[] args) {
new ProgressBarDemo();
}
}
3. ProgressBar et Thread
Vous pouvez créer un objet du fil (Thread) afin d'effectuer certaines tâches, telles que la copie de la liste des fichiers. La copie nécessite de prendre un certain temps, vous devez utiliser ProgressBar pour afficher le pourcentage du travail déjà fait.
ProgressBarCopyDemo.java
package org.o7planning.swt.progressbar;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;
public class ProgressBarCopyDemo {
private CopyThread copyThread = null;
public ProgressBarCopyDemo() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("SWT ProgressBar (o7planning.org)");
shell.setSize(450, 200);
shell.setLayout(null);
ProgressBar progressBar = new ProgressBar(shell, SWT.NONE);
progressBar.setBounds(10, 23, 350, 17);
Label labelInfo = new Label(shell, SWT.NONE);
labelInfo.setBounds(10, 46, 350, 15);
labelInfo.setText(" ...");
// Button Copy
Button buttonCopy = new Button(shell, SWT.NONE);
buttonCopy.setBounds(122, 67, 75, 25);
buttonCopy.setText("Copy");
// Button Cancel
Button buttonCancel = new Button(shell, SWT.NONE);
buttonCancel.setBounds(200, 67, 75, 25);
buttonCancel.setText("Cancel");
buttonCancel.setEnabled(false);
buttonCopy.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
copyThread = new CopyThread(display, progressBar, labelInfo, buttonCopy, buttonCancel);
copyThread.start();
}
});
buttonCancel.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
if (copyThread != null) {
copyThread.cancel();
}
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
public static void main(String[] args) {
new ProgressBarCopyDemo();
}
}
CopyThread.java
package org.o7planning.swt.progressbar;
import java.io.File;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;
public class CopyThread extends Thread {
private Display display;
private ProgressBar progressBar;
private Button buttonCopy;
private Button buttonCancel;
private Label labelInfo;
private boolean cancel;
public CopyThread(Display display, ProgressBar progressBar, //
Label labelInfo, Button buttonCopy, Button buttonCancel) {
this.display = display;
this.progressBar = progressBar;
this.buttonCopy = buttonCopy;
this.buttonCancel = buttonCancel;
this.labelInfo = labelInfo;
}
@Override
public void run() {
if (display.isDisposed()) {
return;
}
this.updateGUIWhenStart();
// Copy All file In C:/Windows
File dir = new File("C:/Windows");
File[] files = dir.listFiles();
int count = files.length;
int i = 0;
for (File file : files) {
if (cancel) {
break;
}
i++;
if (file.isFile()) {
this.copy(file);
} else {
continue;
}
this.updateGUIInProgress(file, i, count);
}
this.updateGUIWhenFinish();
}
private void copy(File file) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
}
}
private void updateGUIWhenStart() {
display.asyncExec(new Runnable() {
@Override
public void run() {
buttonCopy.setEnabled(false);
buttonCancel.setEnabled(true);
}
});
}
private void updateGUIWhenFinish() {
display.asyncExec(new Runnable() {
@Override
public void run() {
buttonCopy.setEnabled(true);
buttonCancel.setEnabled(false);
progressBar.setSelection(0);
progressBar.setMaximum(1);
if (cancel) {
labelInfo.setText("Cancelled!");
} else {
labelInfo.setText("Finished!");
}
}
});
}
private void updateGUIInProgress(File file, int value, int count) {
display.asyncExec(new Runnable() {
@Override
public void run() {
labelInfo.setText("Copying file: " + file.getAbsolutePath());
progressBar.setMaximum(count);
progressBar.setSelection(value);
}
});
}
public void cancel() {
this.cancel = true;
}
}
Tutoriels de programmation Java SWT
- Le Tutoriel de Java SWT FillLayout
- Le Tutoriel de Java SWT RowLayout
- Le Tutorial de Java SWT SashForm
- Le Tutoriel de Java SWT Label
- Le Tutoriel de Java SWT Button
- Le Tutoriel de Java SWT Toggle Button
- Le Tutoriel de Java SWT Radio Button
- Le Tutoriel de Java SWT Text
- Le Tutoriel de Java SWT Password Field
- Le Tutoriel de Java SWT Link
- Programmation de l'application Java Desktop à l'aide de SWT
- Le Tutoriel de Java SWT Combo
- Le Tutoriel de Java SWT Spinner
- Le Tutoriel de Java SWT Slider
- Le Tutoriel de Java SWT Scale
- Le Tutoriel de Java SWT ProgressBar
- Le Tutoriel de Java SWT TabFolder et CTabFolder
- Le Tutoriel de Java SWT List
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