java - 按下分号时将光标置于下一行

Question

当用户按下分号键时，我希望分号保持在同一行但将光标向下移动。例如，

我想要什么

example text; <-- semi-colon been pressed and entered

| <--- cursor moved to here

我现在的代码，分号向下移动，光标放在它旁边，像这样:

我有什么

example text

;| <-- cursor and semi-colon go to a new line

谢谢。

SSCCE:

import java.awt.Font;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.KeyStroke;
import javax.swing.WindowConstants;

public class Example {

private final JFrame frame = new JFrame();
private final JTextPane editor = new JTextPane();

public Example() {
    frameStuff();
    newLineOnSemiColonPress();
}

private void newLineOnSemiColonPress() {
    InputMap input = editor.getInputMap();
    String INSERT_BREAK = "insert-break";
    KeyStroke semi = KeyStroke.getKeyStroke("SEMICOLON");
    input.put(semi, INSERT_BREAK);
}

private void frameStuff() {
    editor.setFont(new Font("Arial", 0, 13));
    frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    frame.setSize(new Dimension(500, 400));
    frame.getContentPane().add(editor);
    frame.setVisible(true);
}

public static void main(String[] args) {
    new Example();
}
}

Answer 1

你只需要在你释放分号键时绑定(bind)添加中断，而不是在你第一次按下它时:

private void newLineOnSemiColonPress() {
    InputMap input = editor.getInputMap();
    String INSERT_BREAK = "insert-break";
    KeyStroke semi = KeyStroke.getKeyStroke("released SEMICOLON");
    input.put(semi, INSERT_BREAK);
}

如果你还没有读过，这里有一个很好的 tutorial here以及有关如何使用键绑定(bind)的更多信息。