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Swing
• štandard od Java 2• „nadmnožina awt“ – aj keď len voľne chápané• komponenty sa volajú Jxxxx• vlastný look-and-feel• Nemiešajte awt a swing komponenty
– javax.swing – javax.swing.event – ….
import javax.sw
ing.*;
awt vs. swing
JButtonimport java.applet.*;import javax.swing.*;
public class JButtonDemo extends Applet { JButton b1 = new JButton("JButton 1"), b2 = new JButton("JButton 2"); JTextField t = new JTextField(20);
public void init() { ActionListener al = new ActionListener() { public void actionPerformed(ActionEvent e){ String name = ((JButton)e.getSource()).getText(); t.setText(name + " Pressed"); } };
b1.addActionListener(al); add(b1); b2.addActionListener(al); add(b2); add(t); }
JFrame public static void main(String args[]) {
JButtonDemo applet = new JButtonDemo();
JFrame frame = new JFrame("TextAreaNew");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e){
System.exit(0);
} });
frame.getContentPane().add(applet,BorderLayout.CENTER);
frame.setSize(300,100);
applet.init();
applet.start();
frame.setVisible(true);
}
}
Buttoniáda
public class Buttons extends JPanel {
JButton jb = new JButton("JButton");
BasicArrowButton up = new BasicArrowButton( BasicArrowButton.NORTH), down = new BasicArrowButton( BasicArrowButton.SOUTH), right = new BasicArrowButton( BasicArrowButton.EAST), left = new BasicArrowButton( BasicArrowButton.WEST);
public Buttons() {
add(jb);
add(new JToggleButton("JToggleButton"));
add(new JCheckBox("JCheckBox"));
add(new JRadioButton("JRadioButton"));
JPanel jp = new JPanel();
jp.setBorder(new TitledBorder("Directions"));
jp.add(up); jp.add(down); jp.add(left); jp.add(right);
add(jp);
}
}
Grupákypublic class ButtonGroups extends JPanel { static String[] ids = { "zelen", "gula", "cerven", "zalud" };
static JPanel makeBPanel(Class bClass, String[] ids) {
ButtonGroup bg = new ButtonGroup(); JPanel jp = new JPanel(); String title = bClass.getName(); title = title.substring( title.lastIndexOf('.') + 1); jp.setBorder(new TitledBorder(title));
for(int i = 0; i < ids.length; i++) { AbstractButton ab = new JButton("failed"); try { Constructor ctor = bClass.getConstructor(new Class[] { String.class }); ab = (AbstractButton)ctor.newInstance(new Object[]{ids[i]}); } catch(Exception ex) { System.out.println("can't create " + bClass); } bg.add(ab); jp.add(ab); } return jp; }
public ButtonGroups() {
add(makeBPanel(JButton.class, ids));
add(makeBPanel(JToggleButton.class, ids));
add(makeBPanel(JCheckBox.class, ids));
add(makeBPanel(JRadioButton.class, ids));
}
}
IkonyImageIcon implements Icon
Icon xSign = new ImageIcon("x.gif"); Icon oSign = new ImageIcon("o.gif");
java.net.URL imgURL = ButtonDemo.class.getResource("images/right.gif");ImageIcon leftButtonIcon = new ImageIcon(imgURL);
public class RedOval implements Icon { public void paintIcon(Component c, Graphics g, int x, int y) { g.setColor(Color.red); g.drawOval (x, y, getIconWidth(), getIconHeight()); } public int getIconWidth() { return 10; } public int getIconHeight() { return 10; }}
public interface Icon { void paintIcon(Component c, Graphics g, int x, int y); int getIconWidth(); int getIconHeight();}
ButtIkonyImageIcon leftButtonIcon = new ImageIcon(....);
. . . b1 = new JButton("Disable middle button", leftButtonIcon); b1.setVerticalTextPosition(AbstractButton.CENTER); b1.setHorizontalTextPosition(AbstractButton.LEADING); b1.setMnemonic(KeyEvent.VK_D); b1.setActionCommand("disable"); b1.addActionListener(this); b1.setToolTipText("Click this button to disable the middle button.");
public void actionPerformed(ActionEvent e) { if ("disable".equals(e.getActionCommand())) { b2.setEnabled(false); b1.setEnabled(false); b3.setEnabled(true); } . . . .
Ikonyimport java.awt.event.*;import javax.swing.*;
public class Faces extends JPanel { static Icon[] faces = { new ImageIcon("face0.gif"), new ImageIcon("face1.gif"), new ImageIcon("face2.gif"), new ImageIcon("face3.gif"), new ImageIcon("face4.gif"), }; JButton jb = new JButton("JButton", faces[3]), jb2 = new JButton("Disable"); boolean mad = false;
public Faces() { jb.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e){ if(mad) { jb.setIcon(faces[3]); mad = false; } else { jb.setIcon(faces[0]); mad = true; } jb.setVerticalAlignment(JButton.TOP); jb.setHorizontalAlignment(JButton.LEFT); } });
jb.setRolloverEnabled(true);
jb.setRolloverIcon(faces[1]);
jb.setPressedIcon(faces[2]);
jb.setDisabledIcon(faces[4]);
jb.setToolTipText("Yow!");
add(jb);
jb2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
if(jb.isEnabled()) {
jb.setEnabled(false);
jb2.setText("Enable");
} else {
jb.setEnabled(true);
jb2.setText("Disable");
}
}
});
add(jb2);
}
JLabelpublic class LabelPanel extends JPanel {
public LabelPanel() {
JLabel plainLabel = new JLabel("Plain Small Label");add(plainLabel);
JLabel fancyLabel = new JLabel("Fancy Big Label"); Font fancyFont = new Font("Serif", Font.BOLD | Font.ITALIC, 32); fancyLabel.setFont(fancyFont);
Icon tigerIcon = new ImageIcon("SmallTiger.gif"); fancyLabel.setIcon(tigerIcon); fancyLabel.setHorizontalAlignment(JLabel.RIGHT);
add(fancyLabel); }} String labelText =
"<html><FONT COLOR=RED>Red</FONT> and " + "<FONT COLOR=BLUE>Blue</FONT> Text</html>";JLabel coloredLabel = new JLabel(labelText, Label.CENTER);
Border
public class Borders extends JPanel {
static JPanel showBorder(Border b) { JPanel jp = new JPanel(); jp.setLayout(new BorderLayout()); String nm = b.getClass().toString(); nm = nm.substring(nm.lastIndexOf('.') + 1); jp.add(new JLabel(nm, JLabel.CENTER), BorderLayout.CENTER); jp.setBorder(b); return jp; }
public Borders() {
setLayout(new GridLayout(2,4));
add(showBorder(new TitledBorder("Title")));
add(showBorder(new EtchedBorder()));
add(showBorder(new LineBorder(Color.blue)));
add(showBorder(
new MatteBorder(5,5,30,30,Color.green)));
add(showBorder(
new BevelBorder(BevelBorder.RAISED)));
add(showBorder(
new SoftBevelBorder(BevelBorder.LOWERED)));
add(showBorder(new CompoundBorder(
new EtchedBorder(),
new LineBorder(Color.red))));
}
}
JListimport java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;
public class ListCombo extends JPanel {JComboBox combo;JList list;
public ListCombo() { setLayout(new GridLayout(2,1)); list = new JList(ButtonGroups.ids); list.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) { int[] a = list.getSelectedIndices(); for(int i=0; i < list.getSelectedIndices().length; i++)
System.out.println(list.getSelectedIndices()[i]);
}});
add(new JScrollPane(list));
JList
list = new JList(data); // data::Object[]list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);list.setLayoutOrientation(JList.HORIZONTAL_WRAP);...JScrollPane listScroller = new JScrollPane(list);listScroller.setPreferredSize(new Dimension(250, 80));
public void valueChanged(ListSelectionEvent e) { if (e.getValueIsAdjusting() == false) { if (list.getSelectedIndex() == -1) { … } else { … } }}
JCombo
combo = new JComboBox(); for(int i = 0; i < 100; i++) combo.addItem(Integer.toString(i)); add(combo); combo.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) { System.out.println(combo.getSelectedItem()); }});
}
Sliderstatic final int FPS_MIN = 0;static final int FPS_MAX = 30;static final int FPS_INIT = 15; //init
JSlider framesPerSecond = new JSlider(JSlider.HORIZONTAL, FPS_MIN, FPS_MAX, FPS_INIT);
framesPerSecond.addChangeListener(this);
framesPerSecond.setMajorTickSpacing(10);framesPerSecond.setMinorTickSpacing(1);framesPerSecond.setPaintTicks(true);framesPerSecond.setPaintLabels(true);
public void stateChanged(ChangeEvent e) { JSlider source = (JSlider)e.getSource(); if (!source.getValueIsAdjusting()) { int fps = (int)source.getValue(); if (fps == 0) { if (!frozen) stopAnimation(); } else { delay = 1000 / fps; timer.setDelay(delay); timer.setInitialDelay(delay * 10); if (frozen) startAnimation(); } }}
JProgressBar progressBar;...progressBar = new JProgressBar(0, task.getLengthOfTask());progressBar.setValue(0);progressBar.setStringPainted(true);
public void actionPerformed(ActionEvent evt) { progressBar.setValue(task.getCurrent()); String s = task.getMessage(); if (s != null) { taskOutput.append(s + newline); taskOutput.setCaretPosition( taskOutput.getDocument().getLength()); } if (task.isDone()) { Toolkit.getDefaultToolkit().beep(); timer.stop(); startButton.setEnabled(true); setCursor(null); //turn off the wait cursor progressBar.setValue(progressBar.getMinimum()); }}
ProgressBar
Slider & Progress
public class Progress extends JPanel { JProgressBar pb = new JProgressBar(); JSlider sb = new JSlider(JSlider.HORIZONTAL, 0, 100, 60);
public Progress() { setLayout(new GridLayout(2,1)); add(pb); sb.setValue(0); sb.setPaintTicks(true); sb.setMajorTickSpacing(20); sb.setMinorTickSpacing(5); sb.setBorder(new TitledBorder("Slide Me"));
pb.setModel(sb.getModel()); // Share model add(sb); }}
JSplit Pane
splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, listScrollPane, pictureScrollPane);splitPane.setOneTouchExpandable(true);splitPane.setDividerLocation(150);
Dimension minimumSize = new Dimension(100, 50);listScrollPane.setMinimumSize(minimumSize);pictureScrollPane.setMinimumSize(minimumSize);
JScrollBar
public class ScrollbarPanel extends JPanel {
public ScrollbarPanel() { setLayout(new BorderLayout()); JScrollBar scrollBar1 = new JScrollBar (JScrollBar.VERTICAL, 0, 5, 0, 100); add(scrollBar1, BorderLayout.EAST); JScrollBar scrollBar2 = new JScrollBar (JScrollBar.HORIZONTAL, 0, 5, 0, 100); add(scrollBar2, BorderLayout.SOUTH); }}
JText
copy()cut()paste()getSelectedText()setSelectionStart()setSelectionEnd()selectAll()replaceSelection() getText()setText()setEditable()setCaretPosition()
JTextField, JTextArea, JTextPaneJTextField tf = new JTextField();tf.setText("TextField");add(tf);
JTextArea ta = new JTextArea();ta.setText("JTextArea\n Allows Multiple Lines");add(new JScrollPane(ta));
JTextPane tp = new JTextPane();MutableAttributeSet attr = new SimpleAttributeSet();StyleConstants.setFontFamily(attr, "Serif");StyleConstants.setFontSize(attr, 18);StyleConstants.setBold(attr, true);tp.setCharacterAttributes(attr, false);add(new JScrollPane(tp));
PasswordPanel() { JPasswordField pass1 =
new JPasswordField(20); JPasswordField pass2 =
new JPasswordField(20); pass2.setEchoChar ('?'); add(pass1); add(pass2); }
JEditorPanefinal JEditorPane jt = new JEditorPane();jt.setEditable(false);jt.setPage ("file:///C:/borovan/JAVA/index.html");
jt.addHyperlinkListener(new HyperlinkListener () { public void hyperlinkUpdate(final HyperlinkEvent e) { if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) { SwingUtilities.invokeLater(new Runnable() { public void run() { Document doc = jt.getDocument(); try { URL url = e.getURL(); jt.setPage(url); input.setText (url.toString()); } catch (IOException io) { JOptionPane.showMessageDialog ( Browser.this, "Can't follow link", "Invalid Input", JOptionPane.ERROR_MESSAGE); jt.setDocument (doc); } } });
Dialogs//default title and iconJOptionPane.showMessageDialog(frame, “info dialog");
//custom title, warning iconJOptionPane.showMessageDialog(frame, “warning dialog",
"warning", JOptionPane.WARNING_MESSAGE);
//custom title, error iconJOptionPane.showMessageDialog(frame, “error dialog”,
"error", JOptionPane.ERROR_MESSAGE);
//custom title, custom iconJOptionPane.showMessageDialog(frame, “icon", "custom", JOptionPane.INFORMATION_MESSAGE, icon);
JOptionPane optionPane = new JOptionPane( "The only way to close this dialog is by\n" + "pressing one of the following buttons.\n" + "Do you understand?", JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_OPTION);
InputDialogObject[] possibilities = {"ham", "spam", "yam"};
String s = (String)JOptionPane.showInputDialog( frame, "Complete the sentence:\n" + "\"Green eggs and...\"", "Customized Dialog", JOptionPane.PLAIN_MESSAGE, icon, possibilities, "ham");
//If a string was returned, say so.if ((s != null) && (s.length() > 0)) { setLabel("Green eggs and... " + s + "!"); return;}
JMenuBar
public Object[] menuBar = { fileMenu, editMenu, faceMenu, optionMenu, helpMenu, };
static public JMenuBar createMenuBar(Object[] menuBarData) { JMenuBar menuBar = new JMenuBar(); for(int i = 0; i < menuBarData.length; i++) menuBar.add(createMenu((Object[][])menuBarData[i])); return menuBar; }
JMenu
public Object[][] helpMenu = { // Menu name: { "Help", new Character('H') }, // Name type accel listener enabled { "Index", mi, new Character('I'), a1, bT }, { "Using help", mi,new Character('U'),a1,bT}, { null }, // Separator { "About", mi, new Character('t'), a1, bT }, };
static ButtonGroup bgroup;
static public JMenu createMenu(Object[][] menuData) { JMenu menu = new JMenu(); menu.setText((String)menuData[0][0]); menu.setMnemonic(((Character)menuData[0][1]).charValue()); // Create redundantly, in case there are any radio buttons: bgroup = new ButtonGroup(); for(int i = 1; i < menuData.length; i++) { if(menuData[i][0] == null) menu.add(new JSeparator()); else menu.add(createMenuItem(menuData[i])); } return menu; }
JMenuItem
static public JMenuItem createMenuItem(Object[] data) { JMenuItem m = null; MType type = (MType)data[1]; if(type == mi) m = new JMenuItem(); else if(type == cb) m = new JCheckBoxMenuItem(); else if(type == rb) { m = new JRadioButtonMenuItem(); bgroup.add(m); } m.setText((String)data[0]); m.setMnemonic( ((Character)data[2]).charValue()); m.addActionListener((ActionListener)data[3]); m.setEnabled(((Boolean)data[4]).booleanValue()); if(data.length == 6) m.setIcon((Icon)data[5]); return m; }
public Object[][] faceMenu = { { "Faces", new Character('a') }, { "Face 0", rb, new Character('0'), a2, bT, Faces.faces[0] },
Action&ItemListener
menuItem = new JMenuItem(
"Both text and icon",
new ImageIcon("images/middle.gif"));
menuItem.setMnemonic(KeyEvent.VK_B);
menu.add(menuItem);
public class MenuDemo ... implements ActionListener, ItemListener { ... public MenuDemo() { menuItem.addActionListener(this); //...for each JMenuItem instance: ... rbMenuItem.addActionListener(this); //for each JRadioButtonMenuItem: ... cbMenuItem.addItemListener(this); //for each JCheckBoxMenuItem: ... } public void actionPerformed(ActionEvent e) { } public void itemStateChanged(ItemEvent e) { }
Popupimport java.awt.*;import java.awt.event.*;import javax.swing.*;
public class Popup extends JPanel { JPopupMenu popup = new JPopupMenu(); JTextField t = new JTextField(10);
public Popup() { add(t); ActionListener al = new ActionListener() { public void actionPerformed(ActionEvent e){ t.setText( ((JMenuItem)e.getSource()).getText()); } };
JMenuItem m = new JMenuItem(“CutMe"); m.addActionListener(al); popup.add(m); m = new JMenuItem(“CopyMe"); m.addActionListener(al); popup.add(m); m = new JMenuItem(“PasteMe"); m.addActionListener(al); popup.add(m); popup.addSeparator(); m = new JMenuItem(“Nothing"); m.addActionListener(al); popup.add(m); PopupListener pl = new PopupListener(); addMouseListener(pl); t.addMouseListener(pl); }
class PopupListener extends MouseAdapter {
public void mousePressed(MouseEvent e) { maybeShowPopup(e); }
public void mouseReleased(MouseEvent e) { maybeShowPopup(e); }
private void maybeShowPopup(MouseEvent e) { if(e.isPopupTrigger()) { popup.show( e.getComponent(), e.getX(), e.getY()); } } }}
Treesclass Branch { DefaultMutableTreeNode r; public Branch(String[] data) { r = new DefaultMutableTreeNode(data[0]); for(int i = 1; i < data.length; i++) r.add(new DefaultMutableTreeNode(data[i])); } public DefaultMutableTreeNode node() { return r; }}
public class Trees extends JPanel { String[][] data = { { "Colors", "Red", "Blue", "Green" }, { "Flavors", "Tart", "Sweet", "Bland" }, { "Length", "Short", "Medium", "Long" }, { "Volume", "High", "Medium", "Low" }, { "Temperature", "High", "Medium", "Low" }, { "Intensity", "High", "Medium", "Low" }, };
static int i = 0;
DefaultMutableTreeNode root, child, chosen;
JTree tree;
DefaultTreeModel model;
public Trees() {
setLayout(new BorderLayout());
root = new DefaultMutableTreeNode("root");
tree = new JTree(root);
add(new JScrollPane(tree), BorderLayout.CENTER);
model =(DefaultTreeModel)tree.getModel();
JButton test = new JButton("Press me");
test.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
if(i < data.length) {
child = new Branch(data[i++]).node();
chosen = (DefaultMutableTreeNode)
tree.getLastSelectedPathComponent();
if(chosen == null) chosen = root;
model.insertNodeInto(child, chosen, 0);
}
}
});
JPanel p = new JPanel();
p.add(test); add(p, BorderLayout.SOUTH);
}
Tabbed
public class Tabbed extends JPanel {
static Object[][] q = {
{ "Felix", Borders.class },
{ "The Professor", Buttons.class },
{ "Rock Bottom", ButtonGroups.class },
{ "Theodore", Faces.class },
{ "Simon", Menus.class },
{ "Alvin", Popup.class },
{ "Tom", ListCombo.class },
{ "Jerry", Progress.class },
{ "Bugs", Trees.class },
{ "Daffy", Table.class },
};
static JPanel makePanel(Class c) {
String title = c.getName();
title = title.substring(title.lastIndexOf('.') + 1);
JPanel sp = null;
try {
sp = (JPanel)c.newInstance();
} catch(Exception e) {
System.out.println(e);
}
sp.setBorder(new TitledBorder(title));
return sp;
}
public Tabbed() {
setLayout(new BorderLayout());
JTabbedPane tabbed = new JTabbedPane();
for(int i = 0; i < q.length; i++)
tabbed.addTab((String)q[i][0],
makePanel((Class)q[i][1]));
add(tabbed, BorderLayout.CENTER);
tabbed.setSelectedIndex(q.length/2);
}
}
JTable
String[] columnNames = {
"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
Object[][] data = {
{"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath", "Knitting", new Integer(2), new Boolean(false)},
{"Sharon", "Zakhour", "Speed reading", new Integer(20), new Boolean(true)},
{"Philip", "Milne", "Pool", new Integer(10), new Boolean(false)}
};
JTable table = new JTable(data, columnNames);
Tableclass DataModel extends AbstractTableModel { Object[][] data = { {"one", "two", "three", "four"}, {"five", "six", "seven", "eight"}, {"nine", "ten", "eleven", "twelve"}, }; class TML implements TableModelListener { public void tableChanged(TableModelEvent e) { …
} } DataModel() { addTableModelListener(new TML()); } public int getColumnCount() { return data[0].length; } public int getRowCount() { return data.length; } public Object getValueAt(int row, int col) { return data[row][col]; } public void setValueAt(Object val, int row, int col) { data[row][col] = val; // Indicate the change has happened: fireTableDataChanged(); } public boolean isCellEditable(int row, int col) { return true; }};
import java.awt.*;
import javax.swing.*;
public class Table extends JPanel {
public Table() {
setLayout(new BorderLayout());
JTable table = new JTable(new DataModel());
JScrollPane scrollpane =
JTable.createScrollPaneForTable(table);
add(scrollpane, BorderLayout.CENTER);
}
public static void main(String args[]) {
Show.inFrame(new Table(),200,200);
}
}
