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import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.border.BevelBorder;
import javax.swing.border.SoftBevelBorder;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
/**
* JProgressBar Demo
*
* @ author Jeff Dinkins
# @ author Peter Korn ( accessibility support )
*/
public class ProgressBarDemo extends DemoModule {
/**
* main method allows us to run as a standalone demo .
*/
public static void main(String[] args) {
ProgressBarDemo demo = new ProgressBarDemo(null );
demo.mainImpl();
}
/**
* ProgressBarDemo Constructor
*/
public ProgressBarDemo(SwingSet2 swingset) {
// Set the title for this demo, and an icon used to represent this
// demo inside the SwingSet2 app.
super (swingset, "ProgressBarDemo" , "toolbar/JProgressBar.gif" );
createProgressPanel();
}
javax.swing.Timer timer = new javax.swing.Timer(18 , createTextLoadAction());
Action loadAction;
Action stopAction;
JProgressBar progressBar;
JTextArea progressTextArea;
void updateDragEnabled(boolean dragEnabled) {
progressTextArea.setDragEnabled(dragEnabled);
}
public void createProgressPanel() {
getDemoPanel().setLayout(new BorderLayout());
JPanel textWrapper = new JPanel(new BorderLayout());
textWrapper.setBorder(new SoftBevelBorder(BevelBorder.LOWERED));
textWrapper.setAlignmentX(LEFT_ALIGNMENT);
progressTextArea = new MyTextArea();
progressTextArea.getAccessibleContext().setAccessibleName(getString("ProgressBarDemo.accessible_text_area_name" ));
progressTextArea.getAccessibleContext().setAccessibleName(getString("ProgressBarDemo.accessible_text_area_description" ));
textWrapper.add(new JScrollPane(progressTextArea), BorderLayout.CENTER);
getDemoPanel().add(textWrapper, BorderLayout.CENTER);
JPanel progressPanel = new JPanel();
getDemoPanel().add(progressPanel, BorderLayout.SOUTH);
progressBar = new JProgressBar(JProgressBar.HORIZONTAL, 0 , text.length()) {
public Dimension getPreferredSize() {
return new Dimension(300 , super .getPreferredSize().height);
}
};
progressBar.getAccessibleContext().setAccessibleName(getString("ProgressBarDemo.accessible_text_loading_progress" ));
progressPanel.add(progressBar);
progressPanel.add(createLoadButton());
progressPanel.add(createStopButton());
}
public JButton createLoadButton() {
loadAction = new AbstractAction(getString("ProgressBarDemo.start_button" )) {
public void actionPerformed(ActionEvent e) {
loadAction.setEnabled(false );
stopAction.setEnabled(true );
if (progressBar.getValue() == progressBar.getMaximum()) {
progressBar.setValue(0 );
textLocation = 0 ;
progressTextArea.setText("" );
}
timer.start();
}
};
return createButton(loadAction);
}
public JButton createStopButton() {
stopAction = new AbstractAction(getString("ProgressBarDemo.stop_button" )) {
public void actionPerformed(ActionEvent e) {
timer.stop();
loadAction.setEnabled(true );
stopAction.setEnabled(false );
}
};
return createButton(stopAction);
}
public JButton createButton(Action a) {
JButton b = new JButton();
// setting the following client property informs the button to show
// the action text as it's name. The default is to not show the
// action text.
b.putClientProperty("displayActionText" , Boolean .TRUE );
b.setAction(a);
return b;
}
int textLocation = 0 ;
String text = getString("ProgressBarDemo.text" );
public Action createTextLoadAction() {
return new AbstractAction("text load action" ) {
public void actionPerformed (ActionEvent e) {
if (progressBar.getValue() < progressBar.getMaximum()) {
progressBar.setValue(progressBar.getValue() + 1 );
progressTextArea.append(text.substring(textLocation, textLocation+1 ));
textLocation++;
} else {
timer.stop();
loadAction.setEnabled(true );
stopAction.setEnabled(false );
}
}
};
}
class MyTextArea extends JTextArea {
public MyTextArea() {
super (null , 0 , 0 );
setEditable(false );
setText("" );
}
public float getAlignmentX () {
return LEFT_ALIGNMENT;
}
public float getAlignmentY () {
return TOP_ALIGNMENT;
}
}
}
Messung V0.5 in Prozent C=96 H=100 G=97
¤ Dauer der Verarbeitung: 0.16 Sekunden
(vorverarbeitet am 2026-09-03)
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