6 changed files with 272 additions and 1 deletions
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1spaceinvaders/GameProject/bin/.gitignore
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19spaceinvaders/GameProject/log/log4j.log
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6spaceinvaders/gui/.classpath
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2spaceinvaders/gui/.gitignore
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17spaceinvaders/gui/.project
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228spaceinvaders/gui/src/gui/MainGui.java
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/ui/ |
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<?xml version="1.0" encoding="UTF-8"?> |
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<classpath> |
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<classpathentry kind="src" path="src"/> |
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/> |
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<classpathentry kind="output" path="bin"/> |
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</classpath> |
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/bin/ |
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/doc/ |
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<?xml version="1.0" encoding="UTF-8"?> |
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<projectDescription> |
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<name>GuiProjectW11</name> |
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<comment></comment> |
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<projects> |
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</projects> |
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<buildSpec> |
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<buildCommand> |
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<name>org.eclipse.jdt.core.javabuilder</name> |
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<arguments> |
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</arguments> |
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</buildCommand> |
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</buildSpec> |
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<natures> |
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<nature>org.eclipse.jdt.core.javanature</nature> |
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</natures> |
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</projectDescription> |
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package gui; |
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import javax.swing.*; |
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import java.awt.event.*; |
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import java.util.*; |
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/** |
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* a simple GUI that simulates a slow database for name, email entries. For details see constructor {@link MainGui#MainGui() }. |
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* This class provides a simple static {@link #main(String[])} to start/run the GUI window. |
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*/ |
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public class MainGui { |
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private JFrame frame = null; |
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private JPanel cp = new JPanel(); |
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private JPanel topPanel = new JPanel(); |
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private JPanel middlePanel = new JPanel(); |
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private JPanel bottomPanel = new JPanel(); |
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private JTextField tfName = new JTextField("", 20); |
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private JTextField tfMail = new JTextField("", 20); |
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private JButton btBack = new JButton("<--"); |
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private JButton btForward = new JButton("-->"); |
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private JButton btAdd = new JButton("Neu"); |
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private ArrayList<DBEntry> database = new ArrayList<DBEntry>(); |
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private int index = 0; |
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private JMenuItem menuNew = new JMenuItem("Neu"); |
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private JMenuItem menuEnd = new JMenuItem("Ende"); |
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/** inner class representing one entry to DB */ |
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private class DBEntry { |
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String name; |
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String email; |
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} |
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/** inner class to be used for ActionListener back */ |
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private class BackAction implements ActionListener { |
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@Override |
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public void actionPerformed(ActionEvent e) { |
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// always save current entry before loading next |
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DBEntry entry = new DBEntry(); // we create a new DBEntry object instead manipulating the |
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// existing one to simulate real new reference to a new object. |
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entry.name = tfName.getText(); |
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entry.email = tfMail.getText(); |
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saveFieldsToDB(entry, index); |
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if (index >= 1) { |
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index--; |
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DBEntry entryLoaded = getEntryFromDB(index); |
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tfName.setText(entryLoaded.name); |
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tfMail.setText(entryLoaded.email); |
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} |
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} |
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} |
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/** inner class to be used for ActionListener forward */ |
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private class ForwardAction implements ActionListener { |
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@Override |
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public void actionPerformed(ActionEvent e) { |
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// always save current entry before loading next |
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DBEntry entry = new DBEntry(); // we create a new DBEntry object instead manipulating the |
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// existing one to simulate real new reference to a new object. |
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entry.name = tfName.getText(); |
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entry.email = tfMail.getText(); |
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saveFieldsToDB(entry, index); |
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if (index < database.size() - 1) { |
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index++; |
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DBEntry entryLoaded = getEntryFromDB(index); |
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tfName.setText(entryLoaded.name); |
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tfMail.setText(entryLoaded.email); |
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} |
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} |
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} |
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/** inner class to be used for ActionListener exit program */ |
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private class EndAction implements ActionListener { |
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@Override |
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public void actionPerformed(ActionEvent e) { |
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System.exit(0); |
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} |
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} |
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/** inner class to be used for ActionListener add */ |
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private class AddAction implements ActionListener { |
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@Override |
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public void actionPerformed(ActionEvent e) { |
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// always save current entry before loading next |
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DBEntry entry = new DBEntry(); // we create a new DBEntry object instead manipulating the |
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// existing one to simulate real new reference to a new object. |
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entry.name = tfName.getText(); |
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entry.email = tfMail.getText(); |
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saveFieldsToDB(entry, index); |
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addEmptyEntryToDB(); |
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index = database.size() - 1; |
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DBEntry entryLoaded = getEntryFromDB(index); |
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tfName.setText(entryLoaded.name); |
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tfMail.setText(entryLoaded.email); |
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} |
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} |
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/** manipulation of DB and simulates slow connection by Thread.wait() */ |
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private void saveFieldsToDB(DBEntry entry, int index) { |
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database.set(index, entry); |
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doWait(); |
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} |
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/** add an empty entry at end of db (quickly) */ |
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private void addEmptyEntryToDB() { |
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DBEntry dbEntry = new DBEntry(); |
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dbEntry.name = ""; |
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dbEntry.email = ""; |
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database.add(dbEntry); |
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} |
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/** reads from DB (quickly) */ |
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private DBEntry getEntryFromDB(int index) { |
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return this.database.get(index); |
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} |
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/** performing a Thread.wait() for 3 sec */ |
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private void doWait() { |
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try { |
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synchronized (database) { |
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database.wait(3 * 1000); // simulates "slow" database by waiting 3sec before this Thread |
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// continues. wait needs monitor of the object, thus synchronized |
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} |
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} catch (InterruptedException e1) { |
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// intentionally blank; wait did not work or was earlier interrupted. No problem for us. |
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} |
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} |
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/** |
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* constructor that configures and shows the GUI window. It contains two text inputs for name and |
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* email address and three buttons BACK, ADD and FORWARD. For each button own inner classes are |
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* defined as {@link ActionListener}: {@link BackAction}, {@link ForwardAction }, {@link AddAction |
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* }, which all three call the {@link #doWait()} method, which simulates a slow database. Thus, it |
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* will have an effect to move the code of the ActionListeners to extra Threads in order to keep |
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* the GUI responsive. |
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* |
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* @see Runnable |
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* @see Thread |
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* @see ActionListener |
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* |
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*/ |
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public MainGui() { |
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// dummy data to "database" |
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DBEntry e1 = new DBEntry(); |
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e1.name = "Max Muster"; |
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e1.email = "max.muster@hs-fulda.de"; |
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DBEntry e2 = new DBEntry(); |
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e2.name = "Jane Doe"; |
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e2.email = "jane.doe@somewhere.com"; |
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this.database.add(e1); |
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this.database.add(e2); |
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// setup the GUI |
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this.frame = new JFrame("SimpleDB"); |
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this.frame.setContentPane(this.cp); |
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this.cp.setLayout(new BoxLayout(this.cp, BoxLayout.Y_AXIS)); |
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this.topPanel.add(new JLabel("Name")); |
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this.topPanel.add(this.tfName); |
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this.middlePanel.add(new JLabel("E-Mail-Adresse")); |
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this.middlePanel.add(this.tfMail); |
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this.cp.add(this.topPanel); |
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this.cp.add(this.middlePanel); |
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this.bottomPanel.add(this.btBack); |
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this.bottomPanel.add(this.btAdd); |
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this.bottomPanel.add(this.btForward); |
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this.cp.add(this.bottomPanel); |
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// set menu |
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JMenuBar jmb = new JMenuBar(); |
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JMenu menu = new JMenu("Datei"); |
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this.frame.setJMenuBar(jmb); |
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jmb.add(menu); |
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menu.add(menuNew); |
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menu.addSeparator(); |
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menu.add(menuEnd); |
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// register all ActionListeners to GUI components |
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this.btBack.addActionListener(new BackAction()); |
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this.btForward.addActionListener(new ForwardAction()); |
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ActionListener actionAdd = new AddAction(); |
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this.btAdd.addActionListener(actionAdd); |
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this.menuNew.addActionListener(actionAdd); |
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menuEnd.addActionListener(new EndAction()); |
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// initially show current db fields (of index 0) |
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DBEntry entry = getEntryFromDB(index); |
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tfName.setText(entry.name); |
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tfMail.setText(entry.email); |
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this.frame.setSize(800, 200); |
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this.frame.setVisible(true); |
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} |
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/** |
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* a simple main which only creates an instance of {@link MainGui}. |
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* |
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* @param args cmd line arguments (ignored) |
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*/ |
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public static void main(String[] args) { |
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new MainGui(); |
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} |
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} |
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