使用JTextArea来模拟文本控制台 [英] Using JTextArea to simulate a text console
问题描述
我的目标是在Java中获取一个类似控制台的组件，而不一定在JTextArea中，但这似乎是一个合乎逻辑的事情。输出很简单，使用JTextArea提供的方法，但输入是另一回事。我想拦截输入，并行动它 - 逐个字符。我已经找到一些使用DocumentListener的模糊相关的例子，但它似乎不允许我很容易检查什么是刚刚键入，这是我需要决定如何采取行动。
我是否正确？有更好的方法吗？
我包含我的应用程序代码的相关部分。
public class MyFrame extend JFrame {
public MyFrame（）{
Dimension screenSize = Toolkit.getDefaultToolkit ）.getScreenSize（）;
Dimension frameSize = new Dimension（（int）（screenSize.width / 2），（int）（screenSize.height / 2））;
int x =（int）（frameSize.width / 2）;
int y =（int）（frameSize.height / 2）;
setBounds（x，y，frameSize.width，frameSize.height）;
console = new JTextArea（，25,80）;
console.setLineWrap（true）;
console.setFont（new Font（Monospaced，Font.PLAIN，15））;
console.setBackground（Color.BLACK）;
console.setForeground（Color.LIGHT_GRAY）;
console.getDocument（）。addDocumentListener（new MyDocumentListener（））;
this.add（console）;
}
JTextArea控制台;
}
class MyDocumentListener implements DocumentListener
{
public void insertUpdate（DocumentEvent e）
{
textChanged into）;
}
public void removeUpdate（DocumentEvent e）
{
textChanged（removed from）;
}
public void changedUpdate（DocumentEvent e）
{
textChanged（changed）;
}
public void textChanged（String action）
{
System.out.println（action）;
}
}
感谢任何帮助。
EDIT1：我尝试使用带有DocumentFilter的JTextPane来做到这一点，但当我输入东西时，DocumentFilter中的方法不会运行。我附上修改后的代码：
public class MyFrame extends JFrame {
public MyFrame（）{
Dimension screenSize = Toolkit.getDefaultToolkit（）。getScreenSize（）;
Dimension frameSize = new Dimension（（int）（screenSize.width / 2），（int）（screenSize.height / 2））;
int x =（int）（frameSize.width / 2）;
int y =（int）（frameSize.height / 2）;
setBounds（x，y，frameSize.width，frameSize.height）;
console = new JTextPane（）;
//console.setLineWrap (true）;
console.setFont（new Font（Monospaced，Font.PLAIN，15））;
console.setBackground（Color.BLACK）;
console.setForeground（Color.LIGHT_GRAY）;
StyledDocument styledDoc = console.getStyledDocument（）;
if（styledDoc instanceof AbstractDocument）{
doc =（AbstractDocument）styledDoc;
doc.setDocumentFilter（new DocumentSizeFilter（））;
}
this.add（console）;
}
JTextPane控制台;
AbstractDocument doc;
}
class DocumentSizeFilter extends DocumentFilter {
public DocumentSizeFilter（）{
}
public void insertString（FilterBypass fb，int offs，String str，AttributeSet a）throws BadLocationException {
System.out.println（str）;
if（str.equals（y））{
System.out.println（You have pressed y。）;
}
}
public void replace（FilterBypass fb，int offs，int length，String str，AttributeSet a）throws BadLocationException {
}
}
我想拦截输入，并对
执行操作
然后你应该使用DocumentFilter。有关详细信息，请参见实现文档过滤器。 p>
My objective here is to obtain a console-like-behaving component in Java, not necessarily in JTextArea, but this seemed like a logical thing to try first. Output is simple enough, using the methods provided by the JTextArea, but input is another thing. I want to intercept input, and act on it - character by character. I've found some examples on using a DocumentListener for something vaguely related, but it doesn't seem to allow me to easily check what was just typed in, which is what I need to decide how to act upon it.
Am I going about this correctly? Is there a better method for this?
I enclose the pertinent parts of my application code.
public class MyFrame extends JFrame {
public MyFrame() {
Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize=new Dimension((int)(screenSize.width/2),(int)(screenSize.height/2));
int x=(int)(frameSize.width/2);
int y=(int)(frameSize.height/2);
setBounds(x,y,frameSize.width,frameSize.height);
console = new JTextArea("",25,80);
console.setLineWrap(true);
console.setFont(new Font("Monospaced",Font.PLAIN,15));
console.setBackground(Color.BLACK);
console.setForeground(Color.LIGHT_GRAY);
console.getDocument().addDocumentListener(new MyDocumentListener());
this.add(console);
}
JTextArea console;
}
class MyDocumentListener implements DocumentListener
{
public void insertUpdate(DocumentEvent e)
{
textChanged("inserted into");
}
public void removeUpdate(DocumentEvent e)
{
textChanged("removed from");
}
public void changedUpdate(DocumentEvent e)
{
textChanged("changed");
}
public void textChanged(String action)
{
System.out.println(action);
}
}
Thanks for any help.
EDIT1: I have attempted to do this using a JTextPane with a DocumentFilter, but when I input something, the method in the DocumentFilter isn't getting run. I enclose the modified code:
public class MyFrame extends JFrame {
public MyFrame() {
Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize=new Dimension((int)(screenSize.width/2),(int)(screenSize.height/2));
int x=(int)(frameSize.width/2);
int y=(int)(frameSize.height/2);
setBounds(x,y,frameSize.width,frameSize.height);
console = new JTextPane();
//console.setLineWrap(true);
console.setFont(new Font("Monospaced",Font.PLAIN,15));
console.setBackground(Color.BLACK);
console.setForeground(Color.LIGHT_GRAY);
StyledDocument styledDoc = console.getStyledDocument();
if (styledDoc instanceof AbstractDocument) {
doc = (AbstractDocument)styledDoc;
doc.setDocumentFilter(new DocumentSizeFilter());
}
this.add(console);
}
JTextPane console;
AbstractDocument doc;
}
class DocumentSizeFilter extends DocumentFilter {
public DocumentSizeFilter() {
}
public void insertString(FilterBypass fb, int offs, String str, AttributeSet a) throws BadLocationException {
System.out.println(str);
if (str.equals("y")) {
System.out.println("You have pressed y.");
}
}
public void replace(FilterBypass fb, int offs, int length, String str, AttributeSet a) throws BadLocationException {
}
}
I want to intercept input, and act on it
Then you should probably be using a DocumentFilter. See Implementing a Document Filter for more information.
这篇关于使用JTextArea来模拟文本控制台的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
