Java JButton.requestFocus方法代碼示例

import javax.swing.JButton; //導入方法依賴的package包/類
private void setup(String server)
{
	okPressed = false;

	JLabel usernameLabel = new JLabel("Username");
	JLabel passwordLabel = new JLabel("Password");

	ok = new JButton("OK");
	cancel = new JButton("Cancel");
	username = new JTextField();
	password = new JPasswordField();

	ok.addActionListener(this);
	cancel.addActionListener(this);

	final int height1 = username.getPreferredSize().height;
	final int height2 = ok.getPreferredSize().height;
	final int width1 = Math.max(usernameLabel.getPreferredSize().width, passwordLabel.getPreferredSize().width);
	final int width2 = cancel.getPreferredSize().width;

	final int[] rows = {height1, height1, TableLayout.FILL, height2,};
	final int[] cols = {width1, TableLayout.FILL, width2, width2,};

	JPanel all = new JPanel(new TableLayout(rows, cols, 5, 5));
	all.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));

	all.add(usernameLabel, new Rectangle(0, 0, 1, 1));
	all.add(username, new Rectangle(1, 0, 3, 1));
	all.add(passwordLabel, new Rectangle(0, 1, 1, 1));
	all.add(password, new Rectangle(1, 1, 3, 1));
	all.add(ok, new Rectangle(2, 3, 1, 1));
	all.add(cancel, new Rectangle(3, 3, 1, 1));

	getContentPane().add(all);

	ok.requestFocus();

	setSize(310, 150);
	setTitle("Login to " + server);
	getRootPane().setDefaultButton(ok);
	ComponentHelper.centreOnScreen(this);
}
 

import javax.swing.JButton; //導入方法依賴的package包/類
@Override
public void start() {

    Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
        public void eventDispatched(AWTEvent e) {
            System.err.println(e);
        }
    }, FocusEvent.FOCUS_EVENT_MASK | WindowEvent.WINDOW_FOCUS_EVENT_MASK);

    boolean gained = false;
    final Robot robot = Util.createRobot();

    JFrame frame1 = new JFrame("Main Frame");
    final JButton b1 = new JButton("button1");
    frame1.add(b1);
    frame1.pack();
    frame1.setLocation(0, 300);

    Util.showWindowWait(frame1);

    final JFrame frame2 = new JFrame("Test Frame");
    final JButton b2 = new JButton("button2");
    frame2.add(b2);
    frame2.pack();
    frame2.setLocation(300, 300);

    b2.setEnabled(false);
    b2.requestFocus();

    Util.showWindowWait(frame2);

    robot.delay(500);

    //
    // It's expeced that the focus is restored to <button1>.
    // If not, click <button1> to set focus on it.
    //
    if (!b1.hasFocus()) {
        gained = Util.trackFocusGained(b1, new Runnable() {
            public void run() {
                Util.clickOnComp(b1, robot);
            }
        }, 5000, false);

        if (!gained) {
            throw new RuntimeException("Unexpected state: focus is not on <button1>");
        }
    }

    robot.delay(500);

    //
    // Click <button2>, check that focus is set on the parent frame.
    //
    gained = false;
    gained = Util.trackFocusGained(frame2, new Runnable() {
        public void run() {
            Util.clickOnComp(b2, robot);
        }
    }, 5000, false);

    if (!gained) {
        throw new RuntimeException("Test failed: focus wasn't set to <frame2>");
    }

    System.out.println("Test passed.");
}
 

import javax.swing.JButton; //導入方法依賴的package包/類
private static void createAndShowGUI() {
    mainFrame = new JFrame("Bug 8033699 - 8 Tests for Grouped/Non Group Radio Buttons");
    btnStart = new JButton("Start");
    btnEnd = new JButton("End");
    btnMiddle = new JButton("Middle");

    JPanel box = new JPanel();
    box.setLayout(new BoxLayout(box, BoxLayout.Y_AXIS));
    box.setBorder(BorderFactory.createTitledBorder("Grouped Radio Buttons"));
    radioBtn1 = new JRadioButton("A");
    radioBtn2 = new JRadioButton("B");
    radioBtn3 = new JRadioButton("C");

    ButtonGroup btnGrp = new ButtonGroup();
    btnGrp.add(radioBtn1);
    btnGrp.add(radioBtn2);
    btnGrp.add(radioBtn3);
    radioBtn1.setSelected(true);

    box.add(radioBtn1);
    box.add(radioBtn2);
    box.add(btnMiddle);
    box.add(radioBtn3);

    radioBtnSingle = new JRadioButton("Not Grouped");
    radioBtnSingle.setSelected(true);

    mainFrame.getContentPane().add(btnStart);
    mainFrame.getContentPane().add(box);
    mainFrame.getContentPane().add(radioBtnSingle);
    mainFrame.getContentPane().add(btnEnd);

    mainFrame.getRootPane().setDefaultButton(btnStart);
    btnStart.requestFocus();

    mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    mainFrame.setLayout(new BoxLayout(mainFrame.getContentPane(), BoxLayout.Y_AXIS));

    mainFrame.setSize(300, 300);
    mainFrame.setLocation(200, 200);
    mainFrame.setVisible(true);
    mainFrame.toFront();
}