Admin: 1 версия

2010-06-01T06:45:31Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:44Z

Новая страница

== Better way to set the selection ==



<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>



== Creating a Custom Editing Command for a JTextComponent ==



<source lang="java">

import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.TextAction;
public class Main {
public static void main(String[] argv) throws Exception {
JTextArea comp = new JTextArea();
String actionName = "Lowercase";

JFrame f = new JFrame();
f.add(new JScrollPane(comp));
f.setSize(300,300);
f.setVisible(true);
comp.getInputMap().put(KeyStroke.getKeyStroke("F2"), actionName);
comp.getActionMap().put(actionName, new TextAction(actionName) {
public void actionPerformed(ActionEvent evt) {
JTextComponent comp = getTextComponent(evt);
if (comp.getSelectionStart() == comp.getSelectionEnd()) {
if (comp.getCaretPosition() < comp.getDocument().getLength()) {
try {
int pos = comp.getCaretPosition();
Document doc = comp.getDocument();
String str = doc.getText(pos, 1).toLowerCase();
doc.remove(pos, 1);
doc.insertString(pos, str, null);
comp.moveCaretPosition(pos + 1);
} catch (Exception e) {
System.out.println();
}
}
} else {
int s = comp.getSelectionStart();
int e = comp.getSelectionEnd();
comp.replaceSelection(comp.getSelectedText().toLowerCase());
comp.select(s, e);
}
}
});
}
}

</source>



== Enabling Text-Dragging on a JTextComponent ==



<source lang="java">

import javax.swing.JTextArea;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent textComp = new JTextArea();
textComp.setDragEnabled(true);
}
}

</source>



== Enumerating All the Views in a JTextComponent ==



<source lang="java">

import javax.swing.JTextPane;
import javax.swing.text.JTextComponent;
import javax.swing.text.View;
public class Main {
public static void main(String[] argv) {
JTextComponent textComp = new JTextPane();
View v = textComp.getUI().getRootView(textComp);
walkView(v, 0);
}
public static void walkView(View view, int level) {
int n = view.getViewCount();
for (int i = 0; i < n; i++) {
walkView(view.getView(i), level + 1);
}
}
}

</source>



== Filter all editing operations on a text component ==



<source lang="java">

import javax.swing.JTextField;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) {
JTextComponent textComponent = new JTextField();
AbstractDocument doc = (AbstractDocument) textComponent.getDocument();
doc.setDocumentFilter(new FixedSizeFilter(10));
}
}
class FixedSizeFilter extends DocumentFilter {
int maxSize;
public FixedSizeFilter(int limit) {
maxSize = limit;
}
public void insertString(DocumentFilter.FilterBypass fb, int offset, String str, AttributeSet attr)
throws BadLocationException {
replace(fb, offset, 0, str, attr);
}
public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String str,
AttributeSet attrs) throws BadLocationException {
int newLength = fb.getDocument().getLength() - length + str.length();
if (newLength <= maxSize) {
fb.replace(offset, length, str, attrs);
} else {
throw new BadLocationException("New characters exceeds max size of document", offset);
}
}
}

</source>



== Get the first 3 characters ==



<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>



== Get the last 3 characters ==



<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();
String text = tc.getText();
// Get the last 3 characters
int offset = docLength - 3;
int len = 3;
text = tc.getText(offset, len);
}
}

</source>



== Get value from JTextCompnent and convert it to upper case ==



<source lang="java">

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
public class Main implements ActionListener {
JTextField jtf = new JTextField(10);
JButton jbtnGetTextUpper = new JButton("Get Text In Uppercase");
Main() {
JFrame jfrm = new JFrame("Demonstrate a Text Field");
jfrm.setLayout(new FlowLayout());
jfrm.setSize(240, 140);
jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jtf.setActionCommand("TF");
jtf.addActionListener(this);
jbtnGetTextUpper.addActionListener(this);
jtf.addCaretListener(new CaretListener() {
public void caretUpdate(CaretEvent ce) {
System.out.println("Text in real time: " + jtf.getText());
}
});
jfrm.add(jtf);
jfrm.add(jbtnGetTextUpper);
jfrm.setVisible(true);
}
public void actionPerformed(ActionEvent ae) {
if (ae.getActionCommand().equals("TF")) {
System.out.println("ENTER key pressed: " + jtf.getText());
} else {
String str = jtf.getText().toUpperCase();
System.out.println("Button pressed: " + str);
}
}
public static void main(String args[]) {
new Main();
}
}

</source>



== Highlight a word in JTextComponent ==



<source lang="java">

import java.awt.Color;
import javax.swing.JTextArea;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Document;
import javax.swing.text.Highlighter;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextArea textComp = new JTextArea();
Highlighter hilite = textComp.getHighlighter();
Highlighter.Highlight[] hilites = hilite.getHighlights();
for (int i = 0; i < hilites.length; i++) {
if (hilites[i].getPainter() instanceof MyHighlightPainter) {
hilite.removeHighlight(hilites[i]);
}
}
highlight(textComp);
}
public static void highlight(JTextComponent textComp) {
try {
Highlighter hilite = textComp.getHighlighter();
Document doc = textComp.getDocument();
hilite.addHighlight(3, 5, new MyHighlightPainter(Color.red));
} catch (BadLocationException e) {
e.printStackTrace();
}
}
}
class MyHighlightPainter extends DefaultHighlighter.DefaultHighlightPainter {
public MyHighlightPainter(Color color) {
super(color);
}
}

</source>



== Limiting the Capacity of a JTextComponent ==



<source lang="java">

import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;
import javax.swing.text.PlainDocument;
public class Main {
public static void main(String[] argv) {
JTextComponent textComp = new JTextField();
textComp.setDocument(new FixedSizePlainDocument(10));
}
}
class FixedSizePlainDocument extends PlainDocument {
int maxSize;
public FixedSizePlainDocument(int limit) {
maxSize = limit;
}
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
if ((getLength() + str.length()) <= maxSize) {
super.insertString(offs, str, a);
} else {
throw new BadLocationException("Insertion exceeds max size of document", offs);
}
}
}

</source>



== Listening for Caret Movement Events in a JTextComponent ==



<source lang="java">

import javax.swing.JTextArea;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) {
JTextComponent textComp = new JTextArea();
textComp.addCaretListener(new CaretListener() {
public void caretUpdate(CaretEvent e) {
int dot = e.getDot();
System.out.println("dot is the caret position:" + dot);
int mark = e.getMark();
System.out.println("mark is the non-caret end of the selection: " + mark);
}
});
}
}

</source>



== Listening for Editing Changes in a JTextComponent ==



<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>



== Listing the Key Bindings in a JTextComponent Keymap ==



<source lang="java">

import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import javax.swing.Action;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.text.Keymap;
public class Main {
public static void main(String[] argv) throws Exception {
JTextArea component = new JTextArea();
Keymap map = component.getKeymap();
while (map != null) {
KeyStroke[] keys = map.getBoundKeyStrokes();
for (int i = 0; i < keys.length; i++) {
System.out.println(keys[i].getKeyChar());
Action action = (Action) map.getAction(keys[i]);
System.out.println(action);
}
Action defAction = map.getDefaultAction();
System.out.println(defAction);
map = map.getResolveParent();
}
}
}

</source>



== Modifying Text in a JTextComponent: Append some text ==



<source lang="java">

import javax.swing.JTextField;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent textComp = new JTextField("Initial Text");
Document doc = textComp.getDocument();
// Append some text
doc.insertString(doc.getLength(), "some text", null);
}
}

</source>



== Modifying Text in a JTextComponent: Delete the first 5 characters ==



<source lang="java">

import javax.swing.JTextField;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent textComp = new JTextField("Initial Text");
Document doc = textComp.getDocument();
// Delete the first 5 characters
int pos = 0;
int len = 5;
doc.remove(pos, len);
}
}

</source>



== Modifying Text in a JTextComponent: Insert some text after the 5th character ==



<source lang="java">

import javax.swing.JTextField;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent textComp = new JTextField("Initial Text");
Document doc = textComp.getDocument();
// Insert some text after the 5th character
int pos = 5;
doc.insertString(pos, "some text", null);
}
}

</source>



== Modifying Text in a JTextComponent: Insert some text at the beginning ==



<source lang="java">

import javax.swing.JTextField;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent textComp = new JTextField("Initial Text");
Document doc = textComp.getDocument();
// Insert some text at the beginning
int pos = 0;
doc.insertString(pos, "some text", null);
}
}

</source>



== Modifying Text in a JTextComponent: Replace the first 3 characters with some text ==



<source lang="java">

import javax.swing.JTextField;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextComponent textComp = new JTextField("Initial Text");
Document doc = textComp.getDocument();
// Replace the first 3 characters with some text
int pos = 0;
int len = 3;
doc.remove(pos, len);
doc.insertString(pos, "new text", null);
}
}

</source>



== Moving the Caret of a JTextComponent ==



<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) 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>



== Overriding a Few Default Typed Key Bindings in a JTextComponent ==



<source lang="java">

import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JComponent;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextField component = new JTextField(10);
// Override letter a
component.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke("typed a"),"actionName");
component.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(new Character(" "), 0), "actionName");
component.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke("typed X"), "none");
component.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke("shift pressed SPACE"), "actionName");
component.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(new Character(" "), 0), "none");
MyAction action = new MyAction();

component.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke("pressed SPACE"),action.getValue(Action.NAME));
component.getActionMap().put(action.getValue(Action.NAME), action);
}
}
class MyAction extends AbstractAction{
public MyAction(){
super("Insert Space");
}
public void actionPerformed(ActionEvent evt) {
JTextComponent c = (JTextComponent) evt.getSource();
try {
c.getDocument().insertString(c.getCaretPosition(), " ", null);
} catch (Exception e) {
e.printStackTrace();
}
}
}

</source>



== Remove Highlighting in a JTextComponent ==



<source lang="java">

import java.awt.Color;
import javax.swing.JTextArea;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Document;
import javax.swing.text.Highlighter;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) throws Exception {
JTextArea textComp = new JTextArea();
removeHighlights(textComp);
}
public static void removeHighlights(JTextComponent textComp) {
Highlighter hilite = textComp.getHighlighter();
Highlighter.Highlight[] hilites = hilite.getHighlights();
for (int i = 0; i < hilites.length; i++) {
if (hilites[i].getPainter() instanceof MyHighlightPainter) {
hilite.removeHighlight(hilites[i]);
}
}
}
}

</source>



== Replace selected text ==



<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>



== Set the color behind the selected text ==



<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>



== Set the color of text inside the selection ==



<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>



== Setting the Blink Rate of a JTextComponent"s Caret ==



<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();
// Set rate to blink once a second
c.getCaret().setBlinkRate(1000);
// Set the caret to stop blinking
c.getCaret().setBlinkRate(0);
}
}

</source>



== Sharing a Document Between JTextComponents ==



<source lang="java">

import javax.swing.JTextArea;
import javax.swing.text.JTextComponent;
public class Main {
public static void main(String[] argv) {
JTextComponent textComp1 = new JTextArea();
JTextComponent textComp2 = new JTextArea();
textComp2.setDocument(textComp1.getDocument());
}
}

</source>



== Using a Position in a JTextComponent ==



<source lang="java">

import javax.swing.JTextArea;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.Position;
public class Main {
public static void main(String[] argv) throws Exception{
JTextComponent textComp = new JTextArea();
Document doc = textComp.getDocument();
Position p = null;
int location = 3;
p = doc.createPosition(location);
}
}

</source>



== Using the Selection of a JTextComponent ==



<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>

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Java/Swing JFC/JTextComponent - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010