Java by API/javax.swing/JTextComponent
Содержание
- 1 JTextComponent: addCaretListener(CaretListener listener)
- 2 JTextComponent: getActions()
- 3 JTextComponent: getCaretPosition()
- 4 JTextComponent: getDocument()
- 5 JTextComponent: getHighlighter()
- 6 JTextComponent: getSelectedText()
- 7 JTextComponent: getText(int offs, int len)
- 8 JTextComponent.KeyBinding
- 9 JTextComponent: moveCaretPosition(int pos)
- 10 JTextComponent: print(MessageFormat headerFormat, MessageFormat footerFormat, boolean showPrintDialog, PrintService service, PrintRequestAttributeSet attributes, boolean interactive)
- 11 JTextComponent: read(Reader in, Object desc)
- 12 JTextComponent: replaceSelection(String content)
- 13 JTextComponent: select(int selectionStart, int selectionEnd)
- 14 JTextComponent: setDocument(Document doc)
- 15 JTextComponent: setDragEnabled(boolean b)
- 16 JTextComponent: setFocusAccelerator(char aKey)
- 17 JTextComponent: setNavigationFilter(NavigationFilter filter)
- 18 JTextComponent: setSelectedTextColor(Color c)
- 19 JTextComponent: setSelectionColor(Color c)
- 20 JTextComponent: setSelectionEnd(int selectionEnd)
- 21 JTextComponent: setSelectionStart(int selectionStart)
- 22 JTextComponent: write(Writer out)
JTextComponent: addCaretListener(CaretListener listener)
<source lang="java">
import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.event.CaretEvent; import javax.swing.event.CaretListener; public class MainClass {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame("Caret Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextArea textArea = new JTextArea();
JScrollPane scrollPane = new JScrollPane(textArea);
frame.add(scrollPane, BorderLayout.CENTER);
CaretListener listener = new CaretListener() {
public void caretUpdate(CaretEvent caretEvent) {
System.out.println("dot:"+ caretEvent.getDot());
System.out.println("mark"+caretEvent.getMark());
}
};
textArea.addCaretListener(listener);
frame.setSize(250, 150);
frame.setVisible(true);
}
}
</source>
JTextComponent: getActions()
<source lang="java">
//A simple TextAction example. import javax.swing.Action; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JTextArea; public class Main {
public static void main(String[] args) {
JTextArea ta = new JTextArea();
ta.setLineWrap(true);
Action[] actions = ta.getActions();
JMenuBar menubar = new JMenuBar();
JMenu actionmenu = new JMenu("Actions");
menubar.add(actionmenu);
JMenu firstHalf = new JMenu("1st Half");
JMenu secondHalf = new JMenu("2nd Half");
actionmenu.add(firstHalf);
actionmenu.add(secondHalf);
int mid = actions.length / 2;
for (int i = 0; i < mid; i++) {
firstHalf.add(actions[i]);
}
for (int i = mid; i < actions.length; i++) {
secondHalf.add(actions[i]);
}
// Show it . . .
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(ta);
f.setJMenuBar(menubar);
f.setSize(300, 200);
f.setVisible(true);
}
}
</source>
JTextComponent: getCaretPosition()
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent c = new JTextArea();
c.getCaretPosition();
if (c.getCaretPosition() < c.getDocument().getLength()) {
char ch = c.getText(c.getCaretPosition(), 1).charAt(0);
}
// Move the caret
int newPosition = 0;
c.moveCaretPosition(newPosition);
}
}
</source>
JTextComponent: getDocument()
<source lang="java">
import javax.swing.JTextPane; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import javax.swing.text.BadLocationException; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent textcomp = new JTextPane();
textcomp.setText("Initial Text");
textcomp.getDocument().addDocumentListener(new DocumentListener() {
public void insertUpdate(DocumentEvent evt) {
int off = evt.getOffset();
System.out.println("off:"+off);
int len = evt.getLength();
System.out.println("len:"+len);
try {
String str = evt.getDocument().getText(off, len);
System.out.println(str);
} catch (BadLocationException e) {
}
}
public void removeUpdate(DocumentEvent evt) {
int off = evt.getOffset();
System.out.println("off:"+off);
int len = evt.getLength();
System.out.println("len:"+len);
}
public void changedUpdate(DocumentEvent evt) {
int off = evt.getOffset();
System.out.println("off:"+off);
int len = evt.getLength();
System.out.println("len:"+len);
}
});
}
}
</source>
JTextComponent: getHighlighter()
<source lang="java">
import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.text.DefaultHighlighter; import javax.swing.text.Highlighter; public class Main {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame("MultiHighlight");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextArea comp = new JTextArea(5, 20);
comp.setText("this is a test");
frame.getContentPane().add(new JScrollPane(comp), BorderLayout.CENTER);
String charsToHighlight = "a";
Highlighter h = comp.getHighlighter();
h.removeAllHighlights();
String text = comp.getText().toUpperCase();
for (int j = 0; j < text.length(); j += 1) {
char ch = text.charAt(j);
if (charsToHighlight.indexOf(ch) >= 0)
h.addHighlight(j, j + 1, DefaultHighlighter.DefaultPainter);
}
frame.pack();
frame.setVisible(true);
}
}
</source>
JTextComponent: getSelectedText()
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) {
JTextComponent c = new JTextArea();
// Get text inside selection
c.getSelectedText();
}
}
</source>
JTextComponent: getText(int offs, int len)
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent tc = new JTextArea("Initial Text");
int docLength = tc.getDocument().getLength();
// Get all text
String text = tc.getText();
// Get the first 3 characters
int offset = 0;
int len = 3;
text = tc.getText(offset, len);
}
}
</source>
JTextComponent.KeyBinding
<source lang="java">
import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Insets; import javax.swing.Icon; import javax.swing.InputMap; import javax.swing.UIDefaults; import javax.swing.UIManager; import javax.swing.border.Border; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) {
UIDefaults uidefs = UIManager.getLookAndFeelDefaults();
String[] keys = (String[]) uidefs.keySet().toArray(new String[0]);
for (int i = 0; i < keys.length; i++) {
Object v = uidefs.get(keys[i]);
if (v instanceof Integer) {
int intVal = uidefs.getInt(keys[i]);
} else if (v instanceof Boolean) {
boolean boolVal = uidefs.getBoolean(keys[i]);
} else if (v instanceof String) {
String strVal = uidefs.getString(keys[i]);
} else if (v instanceof Dimension) {
Dimension dimVal = uidefs.getDimension(keys[i]);
} else if (v instanceof Insets) {
Insets insetsVal = uidefs.getInsets(keys[i]);
} else if (v instanceof Color) {
Color colorVal = uidefs.getColor(keys[i]);
} else if (v instanceof Font) {
Font fontVal = uidefs.getFont(keys[i]);
} else if (v instanceof Border) {
Border borderVal = uidefs.getBorder(keys[i]);
} else if (v instanceof Icon) {
Icon iconVal = uidefs.getIcon(keys[i]);
} else if (v instanceof javax.swing.text.JTextComponent.KeyBinding[]) {
JTextComponent.KeyBinding[] keyBindsVal = (JTextComponent.KeyBinding[]) uidefs
.get(keys[i]);
} else if (v instanceof InputMap) {
InputMap imapVal = (InputMap) uidefs.get(keys[i]);
} else {
System.out.println("Unknown type");
}
}
}
}
</source>
JTextComponent: moveCaretPosition(int pos)
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent c = new JTextArea();
c.getCaretPosition();
if (c.getCaretPosition() < c.getDocument().getLength()) {
char ch = c.getText(c.getCaretPosition(), 1).charAt(0);
}
// Move the caret
int newPosition = 0;
c.moveCaretPosition(newPosition);
}
}
</source>
<source lang="java">
import java.awt.BorderLayout; import java.text.MessageFormat; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; public class Main {
public static void main(String[] args) throws Exception {
final JTextArea textArea = new JTextArea();
textArea.setText("text");
JScrollPane jScrollPane = new JScrollPane(textArea);
final MessageFormat header = new MessageFormat("My Header");
final MessageFormat footer = new MessageFormat("My Footer");
JPanel contentPane = new JPanel();
contentPane.setLayout(new BorderLayout());
contentPane.add(jScrollPane, BorderLayout.CENTER);
JFrame frame = new JFrame();
frame.setTitle("Text-component Printing Demo");
frame.setSize(400, 200);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(contentPane);
frame.setVisible(true);
textArea.print(header, footer, true, null, null, true);
}
}
</source>
JTextComponent: read(Reader in, Object desc)
<source lang="java">
import java.awt.BorderLayout; import java.io.FileReader; import java.io.IOException; import javax.swing.JFrame; import javax.swing.JTextField; public class MainClass {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField nameTextField = new JTextField();
frame.add(nameTextField, BorderLayout.NORTH);
FileReader reader = null;
try {
reader = new FileReader("fileName.txt");
nameTextField.read(reader, "fileName.txt");
} catch (IOException exception) {
System.err.println("Load oops");
exception.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException exception) {
System.err.println("Error closing reader");
exception.printStackTrace();
}
}
}
frame.setSize(250, 100);
frame.setVisible(true);
}
}
</source>
JTextComponent: replaceSelection(String content)
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) {
JTextComponent c = new JTextArea();
c.replaceSelection("replacement text");
}
}
</source>
JTextComponent: select(int selectionStart, int selectionEnd)
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) {
JTextComponent c = new JTextArea();
c.select(10, 20);
}
}
</source>
JTextComponent: setDocument(Document doc)
<source lang="java">
import java.awt.GridLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; public class Main {
public static void main(String[] args) {
JFrame frame = new JFrame("Shared Model");
JTextArea areaFiftyOne = new JTextArea();
JTextArea areaFiftyTwo = new JTextArea();
areaFiftyTwo.setDocument(areaFiftyOne.getDocument());
JTextArea areaFiftyThree = new JTextArea();
areaFiftyThree.setDocument(areaFiftyOne.getDocument());
frame.setLayout(new GridLayout(3, 1));
frame.add(new JScrollPane(areaFiftyOne));
frame.add(new JScrollPane(areaFiftyTwo));
frame.add(new JScrollPane(areaFiftyThree));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300, 300);
frame.setVisible(true);
}
}
</source>
JTextComponent: setDragEnabled(boolean b)
<source lang="java">
import java.awt.Container; import javax.swing.BoxLayout; import javax.swing.JFrame; import javax.swing.JTextField; public class Main extends JFrame {
public static void main(String[] args) {
new Main().setVisible(true);
}
public Main() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField field1 = new JTextField("Life"s a drag", 20);
JTextField field2 = new JTextField("and then you drop", 20);
field1.setDragEnabled(true);
field2.setDragEnabled(true);
Container content = getContentPane();
content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
content.add(field1);
content.add(field2);
pack();
}
}
</source>
JTextComponent: setFocusAccelerator(char aKey)
<source lang="java">
import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import javax.swing.SwingConstants; public class Main {
public static void main(String[] args) {
JLabel l;
JTextField t;
JButton b;
JFrame f = new JFrame("Text Accelerator");
f.add(l = new JLabel("Name:", SwingConstants.RIGHT));
l.setDisplayedMnemonic("n");
f.add(l = new JLabel("House/Street:", SwingConstants.RIGHT));
l.setDisplayedMnemonic("h");
f.add(l = new JLabel("City:", SwingConstants.RIGHT));
l.setDisplayedMnemonic("c");
f.add(l = new JLabel("State/County:", SwingConstants.RIGHT));
l.setDisplayedMnemonic("s");
f.add(l = new JLabel("Zip/Post code:", SwingConstants.RIGHT));
l.setDisplayedMnemonic("z");
f.add(l = new JLabel("Telephone:", SwingConstants.RIGHT));
l.setDisplayedMnemonic("t");
f.add(b = new JButton("Clear"));
b.setMnemonic("l");
f.add(t = new JTextField(35));
t.setFocusAccelerator("n");
f.add(t = new JTextField(35));
t.setFocusAccelerator("h");
f.add(t = new JTextField(35));
t.setFocusAccelerator("c");
f.add(t = new JTextField(35));
t.setFocusAccelerator("s");
f.add(t = new JTextField(35));
t.setFocusAccelerator("z");
f.add(t = new JTextField(35));
t.setFocusAccelerator("t");
f.add(b = new JButton("OK"));
b.setMnemonic("o");
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
</source>
<source lang="java">
import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.text.NavigationFilter; import javax.swing.text.Position; public class MainClass {
public static void main(String args[]) throws Exception {
final String START_STRING = "Start\n";
final int START_STRING_LENGTH = START_STRING.length();
JFrame frame = new JFrame("Navigation Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextArea textArea = new JTextArea(START_STRING);
textArea.setCaretPosition(START_STRING_LENGTH);
JScrollPane scrollPane = new JScrollPane(textArea);
frame.add(scrollPane, BorderLayout.CENTER);
NavigationFilter filter = new NavigationFilter() {
public void setDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias) {
if (dot < START_STRING_LENGTH) {
fb.setDot(START_STRING_LENGTH, bias);
} else {
fb.setDot(dot, bias);
}
}
public void moveDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias) {
if (dot < START_STRING_LENGTH) {
fb.setDot(START_STRING_LENGTH, bias);
} else {
fb.setDot(dot, bias);
}
}
};
textArea.setNavigationFilter(filter);
frame.setSize(250, 150);
frame.setVisible(true);
}
}
</source>
JTextComponent: setSelectedTextColor(Color c)
<source lang="java">
import java.awt.Color; import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) {
JTextComponent c = new JTextArea();
c.setSelectedTextColor(Color.red);
}
}
</source>
JTextComponent: setSelectionColor(Color c)
<source lang="java">
import java.awt.Color; import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) {
JTextComponent c = new JTextArea();
c.setSelectionColor(Color.green);
}
}
</source>
JTextComponent: setSelectionEnd(int selectionEnd)
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) {
JTextComponent c = new JTextArea();
c.setSelectionEnd(20);
}
}
</source>
JTextComponent: setSelectionStart(int selectionStart)
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.JTextComponent; public class Main {
public static void main(String[] argv) {
JTextComponent c = new JTextArea();
c.setSelectionStart(10);
}
}
</source>
JTextComponent: write(Writer out)
<source lang="java">
import java.awt.BorderLayout; import java.io.FileWriter; import java.io.IOException; import javax.swing.JFrame; import javax.swing.JTextField; public class MainClass {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField nameTextField = new JTextField();
frame.add(nameTextField, BorderLayout.NORTH);
FileWriter writer = null;
try {
writer = new FileWriter("filename.txt");
nameTextField.write(writer);
} catch (IOException exception) {
System.err.println("Save oops");
exception.printStackTrace();
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException exception) {
System.err.println("Error closing writer");
exception.printStackTrace();
}
}
}
frame.setSize(250, 100);
frame.setVisible(true);
}
}
</source>
