Listener that runs a certain code only when the ENTER key is pressed while the Mouse is in a JTextField? - user-interface

Question

here is the code for the ENTER key pressed and the Mouse in the TextField separately. What I need is for the program to only run my code when the mouse is inside of the JTextField while ENTER key is pressed. Thanks for any help!
string is what I named the JTextField
What the program does is take a String, and then display its reverse when a JButton is clicked, or the mouse is in the JField while ENTER is pressed.
string.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String word = string.getText();
String reversed = "";
char[] letters = word.toCharArray();
for (int i = letters.length-1; i>=0; i--) {
reversed = reversed + letters[i];
}
reversed.trim();
reverseStr.setText(reversed);
}
});
string.addMouseListener(new MouseListener() {
public void mouseEntered(MouseEvent arg0) {
String word = string.getText();
String reversed = "";
char[] letters = word.toCharArray();
for (int i = letters.length-1; i>=0; i--) {
reversed = reversed + letters[i];
}
reversed.trim();
reverseStr.setText(reversed);
}
public void mouseClicked(MouseEvent arg0) {
}
#Override
public void mouseExited(MouseEvent arg0) {
}
#Override
public void mousePressed(MouseEvent arg0) {
}
#Override
public void mouseReleased(MouseEvent arg0) {
}
});

Answer 1

You can define a field, to check whether the mouse is in textfield. Then let the code run when ENTER is pressed and when this field is true.
Take a look at this code:
package test;
import java.awt.BorderLayout;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class Test extends JFrame {
private static final long serialVersionUID = -3677708759387911324L;
private boolean mouseInField = false;
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
new Test().setVisible(true);
});
}
public Test() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300, 300);
JTextField textField = new JTextField(15);
getContentPane().add(textField, BorderLayout.PAGE_START);
textField.addMouseListener(new MouseAdapter() {
#Override
public void mouseEntered(MouseEvent e) {
mouseInField = true;
System.out.println("mouse entered");
}
#Override
public void mouseExited(MouseEvent e) {
mouseInField = false;
System.out.println("mouse exited");
}
});
textField.addKeyListener(new KeyAdapter() {
#Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER && mouseInField)
System.out.println("enter is pressed while mouse is in text field.");
}
});
}
}