我需要知道如何做到这一点:
假设:我有这样的代码JTextArea
:
LOAD R1, 1
DEC R1
STORE M, R1
ADD R4, R1,8
我想将 , 和 的颜色更改为LOAD
BLUE ,将绿色
DEC
更改为
RED 数字更改为 ORANGESTORE
ADD
R1
R4
M
如何更改此文本的颜色?这些文本来自记事本,也可以直接输入到文本区域。
我需要知道如何做到这一点:
假设:我有这样的代码JTextArea
:
LOAD R1, 1
DEC R1
STORE M, R1
ADD R4, R1,8
我想将 , 和 的颜色更改为LOAD
BLUE ,将绿色
DEC
更改为
RED 数字更改为 ORANGESTORE
ADD
R1
R4
M
如何更改此文本的颜色?这些文本来自记事本,也可以直接输入到文本区域。
JTextArea
是为了娱乐Plain Text
。应用于单个字符的设置应用于整个文档JTextArea
。但是,JTextPane
或者JEditorPane
您可以选择String Literals
根据自己的喜好着色。在JTextPane的帮助下,您可以这样做:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
public class TextPaneTest extends JFrame
{
private JPanel topPanel;
private JTextPane tPane;
public TextPaneTest()
{
topPanel = new JPanel();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
EmptyBorder eb = new EmptyBorder(new Insets(10, 10, 10, 10));
tPane = new JTextPane();
tPane.setBorder(eb);
//tPane.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY));
tPane.setMargin(new Insets(5, 5, 5, 5));
topPanel.add(tPane);
appendToPane(tPane, "My Name is Too Good.\n", Color.RED);
appendToPane(tPane, "I wish I could be ONE of THE BEST on ", Color.BLUE);
appendToPane(tPane, "Stack", Color.DARK_GRAY);
appendToPane(tPane, "Over", Color.MAGENTA);
appendToPane(tPane, "flow", Color.ORANGE);
getContentPane().add(topPanel);
pack();
setVisible(true);
}
private void appendToPane(JTextPane tp, String msg, Color c)
{
StyleContext sc = StyleContext.getDefaultStyleContext();
AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.Foreground, c);
aset = sc.addAttribute(aset, StyleConstants.FontFamily, "Lucida Console");
aset = sc.addAttribute(aset, StyleConstants.Alignment, StyleConstants.ALIGN_JUSTIFIED);
int len = tp.getDocument().getLength();
tp.setCaretPosition(len);
tp.setCharacterAttributes(aset, false);
tp.replaceSelection(msg);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new TextPaneTest();
}
});
}
}
这是输出:
由于可能使用Highlighter
(或 Html)JTextArea
,因此此 API 实现了样式化文本的减少选项
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
public class TextPaneHighlighting {
private static final long serialVersionUID = 1L;
private Highlighter.HighlightPainter cyanPainter;
private Highlighter.HighlightPainter redPainter;
public TextPaneHighlighting() {
JFrame frame = new JFrame();
JTextPane textPane = new JTextPane();
textPane.setText("one\ntwo\nthree\nfour\nfive\nsix\nseven\neight\n");
JScrollPane scrollPane = new JScrollPane(textPane);
frame.add(scrollPane, BorderLayout.CENTER);// Highlight some text
cyanPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.cyan);
redPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.red);
try {
textPane.getHighlighter().addHighlight(0, 3, DefaultHighlighter.DefaultPainter);
textPane.getHighlighter().addHighlight(8, 14, cyanPainter);
textPane.getHighlighter().addHighlight(19, 24, redPainter);
} catch (BadLocationException ble) {
}
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setPreferredSize(new Dimension(300, 200));
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
TextPaneHighlighting tph = new TextPaneHighlighting();
}
});
}
}
与之相比,JTextPane
有更多可变的选项,例如荧光笔,带有 Html 或不带 Html、字体,或者通过使用 Html 或直接将另一个 JComponent 放入其中(也知道 JTextArea,但是......)
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
public class Fonts implements Runnable {
private String[] fnt;
private JFrame frm;
private JScrollPane jsp;
private JTextPane jta;
private int width = 450;
private int height = 300;
private GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
private StyledDocument doc;
private MutableAttributeSet mas;
private int cp = 0;
private Highlighter.HighlightPainter cyanPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.cyan);
private Highlighter.HighlightPainter redPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.red);
private Highlighter.HighlightPainter whitePainter = new DefaultHighlighter.DefaultHighlightPainter(Color.white);
private int _count = 0;
private int _lenght = 0;
public Fonts() {
jta = new JTextPane();
doc = jta.getStyledDocument();
jsp = new JScrollPane(jta);
jsp.setPreferredSize(new Dimension(height, width));
frm = new JFrame("awesome");
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setLayout(new BorderLayout());
frm.add(jsp, BorderLayout.CENTER);
frm.setLocation(100, 100);
frm.pack();
frm.setVisible(true);
jta.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
fnt = ge.getAvailableFontFamilyNames();
mas = jta.getInputAttributes();
new Thread(this).start();
}
@Override
public void run() {
for (int i = 0; i < fnt.length; i++) {
StyleConstants.setBold(mas, false);
StyleConstants.setItalic(mas, false);
StyleConstants.setFontFamily(mas, fnt[i]);
StyleConstants.setFontSize(mas, 16);
dis(fnt[i]);
try {
Thread.sleep(75);
} catch (Exception e) {
e.printStackTrace();
}
StyleConstants.setBold(mas, true);
dis(fnt[i] + " Bold");
try {
Thread.sleep(75);
} catch (Exception e) {
e.printStackTrace();
}
StyleConstants.setItalic(mas, true);
dis(fnt[i] + " Bold & Italic");
try {
Thread.sleep(75);
} catch (Exception e) {
e.printStackTrace();
}
StyleConstants.setBold(mas, false);
dis(fnt[i] + " Italic");
try {
Thread.sleep(75);
} catch (Exception e) {
e.printStackTrace();
}
}
jta.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
public void dis(String s) {
_count++;
_lenght = jta.getText().length();
try {
doc.insertString(cp, s, mas);
doc.insertString(cp, "\n", mas);
} catch (Exception bla_bla_bla_bla) {
bla_bla_bla_bla.printStackTrace();
}
if (_count % 2 == 0) {
try {
jta.getHighlighter().addHighlight(1, _lenght - 1, cyanPainter);
} catch (BadLocationException bla_bla_bla_bla) {
}
} else if (_count % 3 == 0) {
try {
jta.getHighlighter().addHighlight(1, _lenght - 1, redPainter);
} catch (BadLocationException bla_bla_bla_bla) {
}
} else {
try {
jta.getHighlighter().addHighlight(1, _lenght - 1, whitePainter);
} catch (BadLocationException bla_bla_bla_bla) {
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Fonts fs = new Fonts();
}
});
}
}
使用可以使用带有 HTML 的 JEditorPane 或编写为元素着色的自定义文档。
在 JTextArea 中不能有不同颜色的不同字符(至少在没有一些复杂的黑客攻击的情况下是这样)。请改用 JTextPane 或 JEditorPane。然后你可以访问它StyledDocument
:
StyledDocument sdoc = pane.getStyledDocument()
已编辑:更改为直接调用getStyledDocument
,而不是转换 getDocument() 的结果
调用更改单个字符或子字符串的颜色setCharacterAttributes
。StyledDocument
只是另一种选择。有关理论,请参阅其他答案。
这个使用预配置的样式作为字段。在暴露这些字段时要小心,嗯,可变的。
public final class SomeClass {
private final JTextPane textPane = new JTextPane();
private final MutableAttributeSet attributes1;
private final MutableAttributeSet attributes2;
public SomeClass() {
attributes1 = new SimpleAttributeSet(textPane.getInputAttributes());
StyleConstants.setForeground(attributes1, Color.BLACK);
StyleConstants.setBackground(attributes1, Color.GREEN);
attributes2 = new SimpleAttributeSet(textPane.getInputAttributes());
StyleConstants.setForeground(attributes2, Color.WHITE);
StyleConstants.setBackground(attributes2, Color.RED);
}
private void print(String msg, AttributeSet attributes) {
try {
textPane.getStyledDocument().insertString(textPane.getDocument().getLength(), msg, attributes);
} catch (BadLocationException ignored) { }
}
}
[Edit] 改回insertString
代替,replaceSelection
因为后者在窗格不可编辑时失败
只是另一种选择。有关理论,请参阅其他答案。
这个在添加文本时创建属性,而不是像 nIcE cOw 的答案那样派生样式。功能是相同的,因为窗格会将属性与任何以前使用的属性合并。
public final class SomeClass {
private final JTextPane textPane = new JTextPane();
private void print(String msg, Color foreground, Color background) {
AttributeSet attributes = new SimpleAttributeSet(textPane.getInputAttributes());
StyleConstants.setForeground(attributes, foreground);
StyleConstants.setBackground(attributes, background);
try {
textPane.getStyledDocument().insertString(textPane.getDocument().getLength(), msg, attributes);
} catch (BadLocationException ignored) { }
}
}
[Edit] 改回insertString
代替,replaceSelection
因为后者在窗格不可编辑时失败