Examples of java.awt.Button

java.awt.Button
This class creates a labeled button. The application can cause some action to happen when the button is pushed. This image depicts three views of a "Quit" button as it appears under the Solaris operating system:

The first view shows the button as it appears normally. The second view shows the button when it has input focus. Its outline is darkened to let the user know that it is an active object. The third view shows the button when the user clicks the mouse over the button, and thus requests that an action be performed.
The gesture of clicking on a button with the mouse is associated with one instance of ActionEvent, which is sent out when the mouse is both pressed and released over the button. If an application is interested in knowing when the button has been pressed but not released, as a separate gesture, it can specialize processMouseEvent, or it can register itself as a listener for mouse events by calling addMouseListener. Both of these methods are defined by Component, the abstract superclass of all components.
When a button is pressed and released, AWT sends an instance of ActionEvent to the button, by calling processEvent on the button. The button's processEvent method receives all events for the button; it passes an action event along by calling its own processActionEvent method. The latter method passes the action event on to any action listeners that have registered an interest in action events generated by this button.
If an application wants to perform some action based on a button being pressed and released, it should implement ActionListener and register the new listener to receive events from this button, by calling the button's addActionListener method. The application can make use of the button's action command as a messaging protocol. @version 1.83 10/31/08 @author Sami Shaio @see java.awt.event.ActionEvent @see java.awt.event.ActionListener @see java.awt.Component#processMouseEvent @see java.awt.Component#addMouseListener @since JDK1.0

            c.actionPerformed(new ActionEvent(this, 0, "console"));
            assertContains(lastUrl, ":9002");
            lastUrl = "-";
            // double-click prevention is 100 ms
            Thread.sleep(200);
            MouseEvent me = new MouseEvent(new Button(), 0, 0, 0, 0, 0, 0, false, MouseEvent.BUTTON1);
            c.mouseClicked(me);
            assertContains(lastUrl, ":9002");
            lastUrl = "-";
            // no delay - ignore because it looks like a double click
            c.mouseClicked(me);

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    // =================================
    selectionPanel = new Panel();
    selectionPanel.setLayout(new BorderLayout());
    selectionPanel.add(new Label("Demo", Label.CENTER), BorderLayout.NORTH);


    Button fullScreen = new Button("Fullscreen");
    fullScreen.addActionListener(new ActionListener() {


      public void actionPerformed(ActionEvent event) {
        toggleFullscreen();
      }
    });

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        if (isWindows) {
            urlText.setFocusable(false);
        }
        mainPanel.add(urlText, constraintsTextField);


        startBrowser = new Button("Start Browser");
        startBrowser.setFocusable(false);
        startBrowser.setActionCommand("console");
        startBrowser.addActionListener(this);
        startBrowser.setFont(font);
        mainPanel.add(startBrowser, constraintsButton);

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      GridBagConstraints gbc = new GridBagConstraints();
      gbc.fill = GridBagConstraints.BOTH;
      gbc.insets = new Insets(5,5,5,5);


      // Exit Button
      exitButton = new Button("Exit");
      class BeepListener implements ActionListener {
         public void actionPerformed(ActionEvent e) {
            toolkit.beep();
            if (clientQuery != null)
               clientQuery.logout();
            //unregisterLogEvents();
            log.info("Good bye!");
            System.exit(0);
         }
      }
      exitButton.addActionListener(new BeepListener());
      gbc.gridx=0; gbc.gridy=0; gbc.gridwidth=1; gbc.gridheight=1;
      gbc.weightx = gbc.weighty = 0.0;
      add(exitButton, gbc);


      // Hide Button
      hideButton = new Button("Hide Window");
      class HideListener implements ActionListener {
         public void actionPerformed(ActionEvent e) {
            hideWindow();
         }
      }
      hideButton.addActionListener(new HideListener());
      gbc.gridx=1; gbc.gridy=0; gbc.gridwidth=1; gbc.gridheight=1;
      gbc.weightx = gbc.weighty = 0.0;
      add(hideButton, gbc);


      // Statistic display with fill level bars
      int offset = 0;
      gbc.gridx=offset; gbc.gridy=1; gbc.gridwidth=1; gbc.gridheight=1;
      gbc.weightx = gbc.weighty = 0.0;
      createBarPanel(publishedMessagesBar, publishedLabel, "Published", gbc, offset++);
      createBarPanel(sentMessagesBar,      sentLabel,      "Update",    gbc, offset++);
      createBarPanel(getMessagesBar,       getLabel,       "Get",       gbc, offset++);




      {  // XPath query GUI
         Panel panel = new Panel();
         panel.setName("QueryPanel");
         panel.setLayout(new BorderLayout());
         panel.setBackground(java.awt.SystemColor.control);


         {  // Field to enter XPath text
            Panel inputPanel = new Panel();
            inputPanel.setLayout(new BorderLayout());


            Label inputLabel = new Label("XPath query: ");
            inputPanel.add("West", inputLabel);


            inputTextField.setText("//key");
            inputPanel.add("Center", inputTextField);
            inputTextField.addKeyListener(new XPathKeyListener());


            panel.add("North", inputPanel);
         }


         {  // TextArea to show query results
            queryOutput = new TextArea();
            queryOutput.setEditable(false);


            panel.add("South", queryOutput);
         }


         gbc.gridx=offset; gbc.gridy=1; gbc.gridwidth=3; gbc.gridheight=1;
         add(panel, gbc);
      }




      // Checkboxes for log levels
      gbc.gridx=0; gbc.gridy=2; gbc.gridwidth=1; gbc.gridheight=1;
      add(new Label("Choose Logging Level: "), gbc);
      gbc.gridx=1; gbc.gridwidth=3; gbc.gridheight=1;
      add(createLogLevelBoxes(), gbc);




      // Clear logging output - Button
      clearLogButton = new Button("Clear Log Window");
      class ClearListener implements ActionListener {
         public void actionPerformed(ActionEvent e) {
            logOutput.setText("");
         }
      }
      clearLogButton.addActionListener(new ClearListener());
      gbc.gridx=4; gbc.gridy=2; gbc.gridwidth=1; gbc.gridheight=1;
      gbc.weightx = gbc.weighty = 0.0;
      add(clearLogButton, gbc);




      // Dump internal state - Button
      dumpButton = new Button("Dump State");
      class DumpListener implements ActionListener {
         public void actionPerformed(ActionEvent e) {
            // logOutput.setText("");  // clear log window
            try {
               log.info("Dump start");

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   }


   private void initUI() throws Exception {
      setBackground(Color.white);
      setForeground(Color.black);
      this.connectButton = new Button("Connect");
      this.connectButton.setActionCommand("connect");
      this.connectButton.addActionListener(this);
      add(this.connectButton);
      this.sendButton = new Button("Send");
      this.sendButton.setActionCommand("send");
      this.sendButton.addActionListener(this);
      add(this.sendButton);
      this.requestArea = new TextArea("", 9, 62);
      this.requestArea.setBackground(Color.white);

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  setLayout(new BorderLayout());


  cntlPanel = new Panel();


  fwdButton = new Button("Forward");
  bwdButton = new Button("Backward");
  rndButton = new Button("Random");


  fwdButton.addActionListener(this);
  bwdButton.addActionListener(this);
  rndButton.addActionListener(this);

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                                   GridBagConstraints c,
                                   String label,
                                   String command,
                                   Object description )
        {
            Button button = new Button( label );
            button.setActionCommand( command );
            
            c.fill = GridBagConstraints.BOTH;
            c.gridwidth = 1;
            gridBag.setConstraints( button, c );
            container.add( button );
            button.addActionListener(this);
            
            c.gridwidth = GridBagConstraints.REMAINDER;
            Component desc;
            if ( description instanceof String )
            {

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    private void addLaunchButton() {


        mainPanel.invalidate();
        mainPanel.removeAll();
        launch = new Button(Messages.getString("VPNLauncher.launcher")); //$NON-NLS-1$
        launch.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                launch();
            }
        });

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        // add the Cancel button to the bottom of the dialog (if allowCancel is
        // true)
        if (allowCancel) {
            Panel bottom = new Panel(new FlowLayout(FlowLayout.CENTER, 1, 1));
            cancel = new Button(Messages.getString("ProgressBar.cancel")); //$NON-NLS-1$
            cancel.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    // pbar.dispose();
                    shouldCancel = true;
                }

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        OptionWrapper choice = new OptionWrapper();
        choice.idx = -1;
        for (int i = 0; choices != null && i < choices.length; i++) {
            //      ImageButton b = new ImageButton(choices[i].getIcon(), choices[i]
            //          .getText(), choices[i].getText());
            Button b = new Button(choices[i].getText()) {
                public Dimension getMinimumSize() {
                    return new Dimension(60, super.getMinimumSize().height);
                }


                public Dimension getPreferredSize() {
                    return getMinimumSize();
                }
            };
            choicePanel.add(b);
            b.addActionListener(new BlockingActionListener(choices[i]));
        }
        if (icon != null) {
            add(new ImageCanvas(icon), "West"); //$NON-NLS-1$
        }
        if(buttonBarAccessory != null) {

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