如何在Java中防止JTextField上的CTRL + C? [英] How can i prevent CTRL+C on a JTextField in java?
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问题描述
如何防止用户复制JTextField的内容?
How can i prevent a user from copying the contents of a JTextField?
我有以下内容,但我无法找到同时获取多个密钥的方法?
i have the following but i cannot figure a way to get multiple keys at the same time?
myTextField.addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e) {
char c = e.getKeyChar();
if (!Character.isDigit(c)) {
e.consume();
}
}
});
推荐答案
为此,您将必须修改KeyAdapter,以便它可以在按下键和释放键时进行注册,以便我们可以知道何时同时按下两个键.同时按下两个键,以下代码应该可以解决问题:
For this, you will have to modify your KeyAdapter so that it can register when a key was pressed and when it was released, so that we may know when both keys were pressed simultaneously, the following code should do the trick:
textfield.addKeyListener(new KeyAdapter() {
boolean ctrlPressed = false;
boolean cPressed = false;
@Override
public void keyPressed(KeyEvent e) {
switch(e.getKeyCode()) {
case KeyEvent.VK_C:
cPressed=true;
break;
case KeyEvent.VK_CONTROL:
ctrlPressed=true;
break;
}
if(ctrlPressed && cPressed) {
System.out.println("Blocked CTRl+C");
e.consume();// Stop the event from propagating.
}
}
@Override
public void keyReleased(KeyEvent e) {
switch(e.getKeyCode()) {
case KeyEvent.VK_C:
cPressed=false;
break;
case KeyEvent.VK_CONTROL:
ctrlPressed=false;
break;
}
if(ctrlPressed && cPressed) {
System.out.println("Blocked CTRl+C");
e.consume();// Stop the event from propagating.
}
}
});
我只是将其添加到我的一个JTextField中.
i was just adding this to one of my JTextFields.
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