文本已更改事件在JTextArea?如何? [英] Text Changed event in JTextArea? How to?
问题描述
我一直试图为我的 JTextArea
制作一个文字改变事件处理机制。为了出于我的目的,当 JTextArea
的文本发生变化时,事件必须被触发。我尝试使用 KeyListener
接口,这里是我的代码。
txtArea.addKeyListener(new KeyListener(){
@Override
public void keyTyped(KeyEvent arg0){
}
@覆盖
public void keyReleased(KeyEvent arg0){
// TODO自动生成的方法存根
}
@Override
public void keyPressed(KeyEvent arg0){
currentText = text.getText();
if(currentText == textString)
JOptionPane.showMessageDialog(null,Correct);
}
});
当文本区域的文本与硬编码文本匹配时,没有任何事情发生。
这个目标可以通过一个 PropertyChangedListener
来实现吗?我可以通过 getDocument()
I have been trying to make a text changed event handling mechanism for my JTextArea
. For my purposes an event has to be fired whenever there is a change in the text of the JTextArea
. I tried using the KeyListener
interface and here is my code for that.
txtArea.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent arg0) {
}
@Override
public void keyReleased(KeyEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void keyPressed(KeyEvent arg0) {
currentText = text.getText();
if (currentText == textString)
JOptionPane.showMessageDialog(null, "Correct");
}
});
Nothing happened when the textarea's text matched the hardcoded text. How can an event changed event be made for this.
Can this objective be achieved with a PropertyChangedListener
? If it can, then how?
I would get the JTextArea's Document via getDocument()
(a PlainDocument actually) and use a DocumentListener to listen for changes. This way you'd capture changes from key strokes and also from copy/paste/cut events.
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