source: java/main/src/main/java/com/framsticks/gui/console/InteractiveConsole.java @ 98

package com.framsticks.gui.console;

import java.awt.AWTKeyStroke;
import java.awt.BorderLayout;
import java.awt.KeyboardFocusManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.font.FontRenderContext;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;

import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JTextField;

import com.framsticks.params.annotations.FramsClassAnnotation;
import com.framsticks.util.FramsticksException;
import com.framsticks.util.lang.Strings;

@FramsClassAnnotation
public abstract class InteractiveConsole extends Console {

        /**
         * Text field for typing commands.
         */
        protected JTextField commandLine;
        protected JButton sendButton;

        protected final LinkedList<String> history = new LinkedList<>();
        protected ListIterator<String> historyCursor;

        public void setCommandLine(String command) {
                commandLine.setText(command);
        }

        /**
         * @param connection
         */
        public InteractiveConsole() {
        }

        @Override
        protected void initializeGui() {
                // TODO Auto-generated method stub
                super.initializeGui();

                commandLine = new JTextField();

                commandLine.addKeyListener(new KeyListener() {
                        @Override
                        public void keyTyped(KeyEvent e) {

                        }

                        @Override
                        public void keyPressed(KeyEvent e) {
                                onKeyPressed(e.getKeyCode());
                        }

                        @Override
                        public void keyReleased(KeyEvent e) {
                        }
                });

                commandLine.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, Collections.<AWTKeyStroke> emptySet());

                completionPopup = new JPopupMenu();

                // completionPopupAction = new AbstractAction() {
                //      @Override
                //      public void actionPerformed(ActionEvent event) {
                //              JMenuItem item = (JMenuItem) event.getSource();
                //              commandLine.setText(item.getText());
                //      }
                // };

                sendButton = new JButton("Send");
                sendButton.setName("send");
                sendButton.addActionListener(new ActionListener() {

                        public void actionPerformed(final ActionEvent e) {
                                sendCurrent();
                        }
                });

                final Box cmdBox = new Box(BoxLayout.LINE_AXIS);
                cmdBox.add(commandLine);
                cmdBox.add(Box.createHorizontalStrut(10));
                cmdBox.add(sendButton);
                cmdBox.setBorder(BorderFactory.createEmptyBorder(0, 7, 7, 7));

                panel.add(cmdBox, BorderLayout.PAGE_END);

                getSwing().addWindowListener(new WindowAdapter() {
                        public void windowOpened(WindowEvent e) {
                                commandLine.requestFocus();
                        }
                });
        }


        protected abstract void findCompletionPropositions(String prefix);

        @SuppressWarnings("serial")
        protected void processCompletionResult(String prefix, List<String> propositions) {
                assert isActive();
                if (propositions.isEmpty()) {
                        return;
                }
                if (!commandLine.getText().equals(prefix)) {
                        return;
                }
                if (propositions.size() == 1) {
                        commandLine.setText(propositions.get(0));
                        return;
                }

                Iterator<String> i = propositions.iterator();
                String common = i.next();
                while (i.hasNext()) {
                        common = Strings.commonPrefix(common, i.next());
                }
                if (!prefix.equals(common)) {
                        commandLine.setText(common);
                        return;
                }

                completionPopup.setVisible(false);
                completionPopup.removeAll();

                for (final String c : propositions) {
                        completionPopup.add(new JMenuItem(new AbstractAction(c) {
                                @Override
                                public void actionPerformed(ActionEvent e) {
                                        commandLine.setText(c);
                                }
                        }));
                }


                double width = commandLine.getFont().getStringBounds(prefix, new FontRenderContext(null, false, false)).getWidth();
                completionPopup.show(commandLine, (int) width, 0);
                completionPopup.requestFocus();
        }

        protected JPopupMenu completionPopup;


        private void onKeyPressed(int keyCode) {
                if (keyCode == KeyEvent.VK_TAB) {
                        try {
                                findCompletionPropositions(commandLine.getText());
                        } catch (FramsticksException e) {
                                handle(e);
                        }
                        return;
                }

                if (keyCode == KeyEvent.VK_UP || keyCode == KeyEvent.VK_DOWN) {
                        boolean up = (keyCode == KeyEvent.VK_UP);
                        if (history.isEmpty()) {
                                return;
                        }

                        String line;
                        if (up) {
                                if (historyCursor == null) {
                                        historyCursor = history.listIterator(0);
                                }
                                if (historyCursor.hasNext()) {
                                        line = historyCursor.next();
                                } else {
                                        historyCursor = null;
                                        line = "";
                                }
                        } else {
                                if (historyCursor == null) {
                                        historyCursor = history.listIterator(history.size());
                                }
                                if (historyCursor.hasPrevious()) {
                                        line = historyCursor.previous();
                                } else {
                                        historyCursor = null;
                                        line = "";
                                }
                        }
                        commandLine.setText(line);
                        return;
                }

                if (keyCode == KeyEvent.VK_ENTER) {
                        sendCurrent();
                        return;
                }

        }

        protected abstract void sendImplementation(String line);

        /**
         * Sends message to manager and adds message to console frame.
         *
         * Message is not put into the text area by that method, because
         * in DirectConsole it is done by means of listening on Connection.
         */
        public void sendCurrent() {
                assert isActive();
                String line = commandLine.getText();
                history.remove(line);
                history.add(0, line);
                historyCursor = null;
                commandLine.setText("");

                sendImplementation(line);

        }

        /**
         * Adds query to console window.
         *
         * @param line Line of string query.
         */
        protected void paintLine(String line) {
                consolePainter.userLine(line);
        }


}