www.pudn.com > stundenplan.rar > Fariseme.java
/*
* Fariseme.java
*
* Created on 23. Mai 2005, 15:55
*/
/**
*
* @author Honger
*/
package stundenplan;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.sql.*;
public class Fariseme extends JPanel
implements ListSelectionListener {
private JList list;
private DefaultListModel listModel;
private static final String addString = "Add";
private static final String deleteString = "Delete";
private static final String upString = "Move up";
private static final String downString = "Move down";
private JButton addButton;
private JButton deleteButton;
private JButton upButton;
private JButton downButton;
private JTextField nameField;
private JTextArea log;
static private String newline = "\n";
private String name;
public Fariseme() {
super(new BorderLayout());
//Create and populate the list model.
listModel = new DefaultListModel();
listModel.addElement("");
try{
Class.forName("org.gjt.mm.mysql.Driver");
Connection c = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test","root","db_pw");
Statement stmt=c.createStatement();
String query = "select fachrichtungsemester from fariseme";
ResultSet r = stmt.executeQuery(query);
while(r.next()){
listModel.addElement(r.getString(1));
}
}
catch(Exception e)
{ // log.setText("Fehler: "+e);
}
listModel.addListDataListener(new MyListDataListener());
//Create the list and put it in a scroll pane.
list = new JList(listModel);
list.setSelectionMode(
ListSelectionModel.SINGLE_INTERVAL_SELECTION);
list.setSelectedIndex(0);
list.addListSelectionListener(this);
JScrollPane listScrollPane = new JScrollPane(list);
//Create the list-modifying buttons.
addButton = new JButton(addString);
addButton.setActionCommand(addString);
addButton.addActionListener(new AddButtonListener());
deleteButton = new JButton(deleteString);
deleteButton.setActionCommand(deleteString);
deleteButton.addActionListener(
new DeleteButtonListener());
upButton = new JButton("Move up");
upButton.setToolTipText("Move the currently selected list item higher.");
upButton.setActionCommand(upString);
upButton.addActionListener(new UpDownListener());
downButton = new JButton("Move down");
downButton.setToolTipText("Move the currently selected list item lower.");
downButton.setActionCommand(downString);
downButton.addActionListener(new UpDownListener());
JPanel upDownPanel = new JPanel(new GridLayout(2, 1));
upDownPanel.add(upButton);
upDownPanel.add(downButton);
//Create the text field for entering new names.
nameField = new JTextField(15);
nameField.addActionListener(new AddButtonListener());
name = listModel.getElementAt(list.getSelectedIndex())
.toString();
nameField.setText(name);
//Create a control panel, using the default FlowLayout.
JPanel buttonPane = new JPanel();
buttonPane.add(nameField);
buttonPane.add(addButton);
buttonPane.add(deleteButton);
buttonPane.add(upDownPanel);
//Create the log for reporting list data events.
log = new JTextArea(10, 20);
JScrollPane logScrollPane = new JScrollPane(log);
//Create a split pane for the log and the list.
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
listScrollPane, logScrollPane);
splitPane.setResizeWeight(0.5);
//Put everything together.
add(buttonPane, BorderLayout.PAGE_START);
add(splitPane, BorderLayout.CENTER);
}
class MyListDataListener implements ListDataListener {
public void contentsChanged(ListDataEvent e) {
log.append("contentsChanged: " + e.getIndex0() +
", " + e.getIndex1() + newline);
log.setCaretPosition(log.getDocument().getLength());
}
public void intervalAdded(ListDataEvent e) {
log.append("intervalAdded: " + e.getIndex0() +
", " + e.getIndex1() + newline);
log.setCaretPosition(log.getDocument().getLength());
}
public void intervalRemoved(ListDataEvent e) {
log.append("intervalRemoved: " + e.getIndex0() +
", " + e.getIndex1() + newline);
log.setCaretPosition(log.getDocument().getLength());
}
}
class DeleteButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
/*
* This method can be called only if
* there's a valid selection,
* so go ahead and remove whatever's selected.
*/
ListSelectionModel lsm = list.getSelectionModel();
int firstSelected = lsm.getMinSelectionIndex();
int lastSelected = lsm.getMaxSelectionIndex();
listModel.removeRange(firstSelected, lastSelected);
int size = listModel.size();
if (size == 0) {
//List is empty: disable delete, up, and down buttons.
deleteButton.setEnabled(false);
upButton.setEnabled(false);
downButton.setEnabled(false);
} else {
//ausgewälte Daten aus Datenbank schmeißen
try{
Class.forName("org.gjt.mm.mysql.Driver");
Connection c=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test","root","db_pw");
Statement stmt=c.createStatement();
String query = "delete from fariseme where fachrichtungsemester ='"+name+"'";
int done = stmt.executeUpdate(query);
log.setText(String.valueOf(done)+" rows werden geloescht! ");
}
catch(Exception ex)
{ log.setText("Fehler: "+ex);
}
//Adjust the selection.
if (firstSelected == listModel.getSize()) {
//Removed item in last position.
firstSelected--;
}
list.setSelectedIndex(firstSelected);
}
}
}
/** A listener shared by the text field and add button. */
class AddButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (nameField.getText().equals("")) {
//User didn't type in a name...
Toolkit.getDefaultToolkit().beep();
return;
}
int index = list.getSelectedIndex();
int size = listModel.getSize();
//If no selection or if item in last position is selected,
//add the new one to end of list, and select new one.
if (index == -1 || (index+1 == size)) {
try{
Class.forName("org.gjt.mm.mysql.Driver");
Connection c=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test","root","db_pw");
Statement stmt=c.createStatement();
String query = "insert into fariseme (fachrichtungsemester) value ('"+nameField.getText()+"')";
int done = stmt.executeUpdate(query);
log.setText(String.valueOf(done)+" rows werden gespeichert! ");
listModel.addElement(nameField.getText());
list.setSelectedIndex(size);
}
catch(Exception ex)
{ log.setText("Fehler: "+ex);
}
//Otherwise insert the new one after the current selection,
//and select new one.
} else {
try{
Class.forName("org.gjt.mm.mysql.Driver");
Connection c=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test","root","db_pw");
Statement stmt=c.createStatement();
String query = "insert into fariseme (fachrichtungsemester) value ('"+nameField.getText()+"')";
int done = stmt.executeUpdate(query);
log.setText(String.valueOf(done)+" rows werden gespeichert! ");
listModel.insertElementAt(nameField.getText(), index+1);
list.setSelectedIndex(index+1);
}
catch(Exception ex)
{ log.setText("Fehler: "+ex);
}
}
}
}
//Listen for clicks on the up and down arrow buttons.
class UpDownListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
//This method can be called only when
//there's a valid selection,
//so go ahead and move the list item.
int moveMe = list.getSelectedIndex();
if (e.getActionCommand().equals(upString)) {
//UP ARROW BUTTON
if (moveMe != 0) {
//not already at top
swap(moveMe, moveMe-1);
list.setSelectedIndex(moveMe-1);
list.ensureIndexIsVisible(moveMe-1);
}
} else {
//DOWN ARROW BUTTON
if (moveMe != listModel.getSize()-1) {
//not already at bottom
swap(moveMe, moveMe+1);
list.setSelectedIndex(moveMe+1);
list.ensureIndexIsVisible(moveMe+1);
}
}
}
}
//Swap two elements in the list.
private void swap(int a, int b) {
Object aObject = listModel.getElementAt(a);
Object bObject = listModel.getElementAt(b);
listModel.set(a, bObject);
listModel.set(b, aObject);
}
//Listener method for list selection changes.
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting() == false) {
if (list.getSelectedIndex() == -1) {
//No selection: disable delete, up, and down buttons.
deleteButton.setEnabled(false);
upButton.setEnabled(false);
downButton.setEnabled(false);
nameField.setText("");
} else if (list.getSelectedIndices().length > 1) {
//Multiple selection: disable up and down buttons.
deleteButton.setEnabled(true);
upButton.setEnabled(false);
downButton.setEnabled(false);
} else {
//Single selection: permit all operations.
deleteButton.setEnabled(true);
upButton.setEnabled(true);
downButton.setEnabled(true);
name = list.getSelectedValue().toString();
nameField.setText(name);
}
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
public static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("Fachrichtung&Semesterzahl-Editor");
//frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new Fariseme();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Don't let the content pane get too small.
//(Works if the Java look and feel provides
//the window decorations.)
newContentPane.setPreferredSize(
new Dimension(500,600));
//Display the window.
frame.pack();
frame.setVisible(true);
}
}