Example usage for java.awt List getSelectedItem

Introduction

In this page you can find the example usage for java.awt List getSelectedItem.

Prototype

public synchronized String getSelectedItem() 

Source Link

Document

Gets the selected item on this scrolling list.

Usage

From source file:Sampler.java

private void createUI() {
    setFont(new Font("Serif", Font.PLAIN, 12));
    setLayout(new BorderLayout());
    // Set our location to the left of the image frame.
    setSize(200, 350);//from  ww w  .  j a  v  a2  s .  c o m
    Point pt = mImageFrame.getLocation();
    setLocation(pt.x - getSize().width, pt.y);

    final Checkbox accumulateCheckbox = new Checkbox("Accumulate", false);
    final Label statusLabel = new Label("");

    // Make a sorted list of the operators.
    Enumeration e = mOps.keys();
    Vector names = new Vector();
    while (e.hasMoreElements())
        names.addElement(e.nextElement());
    Collections.sort(names);
    final java.awt.List list = new java.awt.List();
    for (int i = 0; i < names.size(); i++)
        list.add((String) names.elementAt(i));
    add(list, BorderLayout.CENTER);

    // When an item is selected, do the corresponding transformation.
    list.addItemListener(new ItemListener() {
        public void itemStateChanged(ItemEvent ie) {
            if (ie.getStateChange() != ItemEvent.SELECTED)
                return;
            String key = list.getSelectedItem();
            BufferedImageOp op = (BufferedImageOp) mOps.get(key);
            BufferedImage source = mSplitImageComponent.getSecondImage();
            boolean accumulate = accumulateCheckbox.getState();
            if (source == null || accumulate == false)
                source = mSplitImageComponent.getImage();
            String previous = mImageFrame.getTitle() + " + ";
            if (accumulate == false)
                previous = "";
            mImageFrame.setTitle(previous + key);
            statusLabel.setText("Performing " + key + "...");
            list.setEnabled(false);
            accumulateCheckbox.setEnabled(false);
            BufferedImage destination = op.filter(source, null);
            mSplitImageComponent.setSecondImage(destination);
            mSplitImageComponent.setSize(mSplitImageComponent.getPreferredSize());
            mImageFrame.setSize(mImageFrame.getPreferredSize());
            list.setEnabled(true);
            accumulateCheckbox.setEnabled(true);
            statusLabel.setText("Performing " + key + "...done.");
        }
    });

    Button loadButton = new Button("Load...");
    loadButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            FileDialog fd = new FileDialog(Sampler.this);
            fd.show();
            if (fd.getFile() == null)
                return;
            String path = fd.getDirectory() + fd.getFile();
            mSplitImageComponent.setImage(path);
            mSplitImageComponent.setSecondImage(null);
            //            Utilities.sizeContainerToComponent(mImageFrame,
            //               mSplitImageComponent);
            mImageFrame.validate();
            mImageFrame.repaint();
        }
    });

    Panel bottom = new Panel(new GridLayout(2, 1));
    Panel topBottom = new Panel();
    topBottom.add(accumulateCheckbox);
    topBottom.add(loadButton);
    bottom.add(topBottom);
    bottom.add(statusLabel);
    add(bottom, BorderLayout.SOUTH);

    addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
            mImageFrame.dispose();
            dispose();
            System.exit(0);
        }
    });
}

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