Code Examplets phần 9 pdf

Object data = TableModelevt.getSource.getValueAt row, column; processdata; } } Examplets TM provided by permission of the publisher, Addision-Wesley, and Author Patrick Chan.. } } Ex

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Creating a Table

A table fires change events when the contents of one of its cells ismodified

Object[][] cellData = { {"row1-col1", "row1-col2"}, {"row2-col1", "row2-col2"}};

String[] columnNames = {"col1", "col2"};

JTable table = new JTable(cellData, columnNames);

// The next two lines should be in one line

table.getModel().addTableModelListener(

new MyTableChangedListener());

// Make the table scrollable

JScrollPane scrollPane = new JScrollPane(table);

class MyTableChangedListener implements TableModelListener { public void tableChanged(TableModelEvent evt) { int row = evt.getFirstRow();

int column = evt.getColumn();

// The next three lines should all be in one line Object data =

((TableModel)evt.getSource()).getValueAt(

row, column);

process(data);

} }

Examplets TM provided by permission of the publisher, Addision-Wesley, and Author Patrick Chan.

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Creating a Text Area

The text area fires a document event whenever the text changes orsome style on the text changes

TextArea textArea = new JTextArea("Line1\nLine2");

TextArea.getDocument().addDocumentListener(

new MyDocumentListener());

class MyDocumentListener implements DocumentListener {

public void insertUpdate(DocumentEvent evt) { // Some text was inserted

} public void removeUpdate(DocumentEvent evt) { // Some text was inserted

} public void changedUpdate(DocumentEvent evt) { // The style of some text was changed

} }

[ This page was updated: 19-Jul-2000 ]

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Displaying Simple HTML Files

try { String url = "http://java.sun.com"; JEditorPane editorPane = new JEditorPane(url);

editorPane.setEditable(false);

JFrame frame = new JFrame();

frame.getContentPane().add(editorPane, BorderLayout.CENTER);

frame.setSize(width, height);

frame.setVisible(true);

} catch (IOException e) { }

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Creating a Toolbar

This example adds an image button to the toolbar

ImageIcon icon = new ImageIcon("image.gif");

JButton button = new JButton(icon);

button.addActionListener(actionListener);

JToolBar toolbar = new JToolBar();

toolbar.add(button);

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http://developer.java.sun.com/developer/codesamples/javax.swing/211.html [8/1/2000 7:50:38 AM]

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Creating a Borderless Window

JWindow window = new JWindow();

// Add component to the window

window.getContentPane().add(component, BorderLayout.CENTER);

// Set initial size

window.setSize(300, 300);

// Show the window

window.setVisible(true);

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Showing a Dialog Box

// Modal dialog with OK button

JOptionPane.showMessageDialog(frame, "Line1\nLine2");

// Modal dialog with yes/no button

int answer = JOptionPane.showConfirmDialog(

frame, "Line1\nLine2");

if (answer == JOptionPane.YES_OPTION) { // User clicked YES

} else if (answer == JOptionPane.NO_OPTION) { // User clicked NO

} // Modal dialog with OK/cancel and a text field String text = JOptionPane.showInputDialog(

frame, "Line1\nLine2");

if (text == null) { // User clicked cancel } else {

process(text);

}

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Creating Key Strokes and Binding Them to Actions

// Some examples of keystrokes

ActionEvent evt) { process(evt);

} } );

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Adding an InputMap to a Component

InputMap inputMap = new InputMap();

// Add a KeyStroke inputMap.put(KeyStroke.getKeyStroke(

"F2"), "actionName");

inputMap.setParent(component.getInputMap(

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Setting a Tool Tip

component.setToolTipText("aString");

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Laying Out Components in a Row or Column

// Use Y_AXIS for a vertical column

Box box = new Box(BoxLayout.X_AXIS);

box.add(component1);

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Separating Components in a Row or Column

Box box = new Box(BoxLayout.X_AXIS);

// Glue spreads the components as far apart as // possible

box.add(Box.createGlue());

// Strut spreads the components apart by a fixed // distance

int width = 10; box.add(Box.createHorizontalStrut(width));

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Laying Out Components in a Flow (Left-to-Right, Top-to-Bottom)

int align = FlowLayout.CENTER; // or LEFT, RIGHT JPanel panel = new JPanel(new FlowLayout(align));

panel.add(component1);

panel.add(component2);

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Laying Out Components in a Grid

When components are added to the container, they fill the gridleft-to-right, top-to-bottom

int rows = 2; int cols = 2; // The next two lines should be in one line

JPanel panel = new JPanel(new GridLayout(

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Laying Out Components Using Absolute Coordinates

JPanel panel = new JPanel(null);

component.setBounds(x, y, w, h);

panel.add(component);

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component.setBorder(BorderFactory.createMatteBorder( -1, -1, -1, -1, icon));

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Adding a Title to a Border

// Use default border

TitledBorder titledBorder = BorderFactory.createTitledBorder("Title");

// Create around existing border

titledBorder = BorderFactory.createTitledBorder(

border, "Title");

// Also available: DEFAULT_JUSTIFICATION, LEFT, // RIGHT

titledBorder.setTitleJustification(

TitledBorder.CENTER);

// Also available: DEFAULT_POSITION, ABOVE_TOP, TOP, // ABOVE_BOTTOM, BOTTOM, BELOW_BOTTOM

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Creating a Compound Border

// border1 is around border2 Border newBorder =

BorderFactory.createCompoundBorder(border1, border2);

component.setBorder(newBorder);

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Determining the Available Look and Feels

UIManager.LookAndFeelInfo[] info = UIManager.getInstalledLookAndFeels();

for (int i=0; i<info.length; i++) { String humanReadableName = info[i].getName();

String className = info[i].getClassName();

// The className is used with // UIManager.setLookAndFeel() }

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Setting the Look and Feel

To change the look and feel, you need to know the class name ofthe new look and feel This example changes it to the Windows lookand feel

try { // The next three lines should all be in one line UIManager.setLookAndFeel(

"com.sun.java.swing.plaf.windows.

WindowsLookAndFeel");

} catch (InstantiationException e) { } catch (ClassNotFoundException e) { } catch (UnsupportedLookAndFeelException e) { } catch (IllegalAccessException e) {

}

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Painting the Background of a Container with an Image Pattern

This example shows how to use an image pattern to fill thebackground of a container instead of a solid color The methodused in this example makes use of a TexturePaint object to paintthe image pattern For information on how to convert an image to

a buffered image, see "Converting an Image to a Buffered Image"

public class ImageBgPanel extends JPanel { TexturePaint texture;

ImageBgPanel() { texture = new TexturePaint(bufferedImage, // The next two lines should be in one line new Rectangle(0, 0,

bufferedImage.getWidth(

), bufferedImage.getHeight()));

} // The class should override this method

public void paintComponent(Graphics g) { Graphics2D g2d = (Graphics2D)g;

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Handling Hyperlink Events

Hyperlink events are fired by a JEditorPane when the user clicks on

a hyperlink

try { String url = "http://java.sun.com"; JEditorPane editorPane = new JEditorPane(url);

editorPane.setEditable(false);

editorPane.addHyperlinkListener(

new MyHyperlinkListener());

} catch (IOException e) { }

class MyHyperlinkListener implements HyperlinkListener { public void hyperlinkUpdate(HyperlinkEvent evt) {

if (evt.getEventType() ==

HyperlinkEvent.EventType.ACTIVATED) { JEditorPane pane =

(JEditorPane)evt.getSource();

try { // Show the new page in the editor pane pane.setPage(evt.getURL());

} catch (IOException e) { e.printStackTrace();

} } } }

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Handling Changes to a List Component

List data events are fired by a ListModel whenever one or moreitems are changed, added, or removed

JList list = new JList(new DefaultListModel());

list.getModel().addListDataListener(

new MyListDataListener());

class MyListDataListener implements ListDataListener { public void contentsChanged(ListDataEvent evt) { // A non-contiguous set of items were added, // removed, or modified

ListModel model = (ListModel)evt.getSource(); // The next tow lines should be in one line for (int i=evt.getIndex0(); i<=evt.getIndex1(); i++) {

process(model.getElementAt(i));

} } public void intervalAdded(ListDataEvent evt) { // The items between evt.getIndex0() and // evt.getIndex1(), inclusive, were added ListModel model = (ListModel)evt.getSource(); for (int i=evt.getIndex0();

i<=evt.getIndex1(); i++) {

process(model.getElementAt(i));

} } public void intervalRemoved(ListDataEvent evt) { // The items between evt.getIndex0()

// and evt.getIndex1(), inclusive, // have been removed

} }

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Tiêu đề	Code Examples from the Java Developers Almanac 2000
Tác giả	Patrick Chan
Trường học	Sun Microsystems, Inc.
Chuyên ngành	Java Development
Thể loại	Sách hướng dẫn
Năm xuất bản	2000

Định dạng
Số trang	46
Dung lượng	5,99 MB