使用Tab键从JTextArea移动焦点 [英] Moving focus from JTextArea using tab key

问题描述

如上所述，我想更改 JTextArea 中的默认TAB行为（这样它就像 JTextField 或类似组件）

As stated, I want to change the default TAB behaviour within a JTextArea (so that it acts like a JTextField or similar component)

这是事件动作

private void diagInputKeyPressed(java.awt.event.KeyEvent evt) {
    if(evt.KEY_PRESSED == java.awt.event.KeyEvent.VK_TAB) {
        actionInput.transferFocus();
    }
}

这里是听众

diagInput.addKeyListener(new java.awt.event.KeyAdapter() {
    public void keyPressed(java.awt.event.KeyEvent evt) {
        diagInputKeyPressed(evt);
    }
});

我也尝试过evt.KEY_TYPED而且没有任何快乐。

I've tried evt.KEY_TYPED as well with no joy.

任何想法？

快速编辑：我还试过 requestFocus（） in地点 transferFocus（）

quick edit: I've also tried requestFocus() in place of transferFocus()

推荐答案

根据此课程：

/**
 * Some components treat tabulator (TAB key) in their own way.
 * Sometimes the tabulator is supposed to simply transfer the focus
 * to the next focusable component.
 * <br/>
 * Here s how to use this class to override the "component's default"
 * behavior:
 * <pre>
 * JTextArea  area  = new JTextArea(..);
 * <b>TransferFocus.patch( area );</b>
 * </pre>
 * This should do the trick. 
 * This time the KeyStrokes are used.
 * More elegant solution than TabTransfersFocus().
 * 
 * @author kaimu
 * @since 2006-05-14
 * @version 1.0
 */
public class TransferFocus {

    /**
     * Patch the behaviour of a component. 
     * TAB transfers focus to the next focusable component,
     * SHIFT+TAB transfers focus to the previous focusable component.
     * 
     * @param c The component to be patched.
     */
    public static void patch(Component c) {
        Set<KeyStroke> 
        strokes = new HashSet<KeyStroke>(Arrays.asList(KeyStroke.getKeyStroke("pressed TAB")));
        c.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, strokes);
        strokes = new HashSet<KeyStroke>(Arrays.asList(KeyStroke.getKeyStroke("shift pressed TAB")));
        c.setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, strokes);
    }
}

注意 patch（）根据 Joshua Goldberg 的可以更短//stackoverflow.com/questions/525855/moving-focus-from-jtextarea-using-tab-key/525867#comment37587468_525867\">评论，因为目标是取回由<$ c覆盖的默认行为$ c> JTextArea ：

Note that patch() can be even shorter, according to Joshua Goldberg in the comments, since the goal is to get back default behaviors overridden by JTextArea:

component.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERS‌​AL_KEYS, null);
component.setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERS‌​AL_KEYS, null);

这用于问题如何在 JTextArea 中修改tab键的行为？

This is used in question "How can I modify the behavior of the tab key in a JTextArea?"

之前的实施确实涉及监听器，以及a transferFocus（）：

The previous implementation involved indeed a Listener, and the a transferFocus():

   /**
     * Override the behaviour so that TAB key transfers the focus
     * to the next focusable component.
     */
    @Override
    public void keyPressed(KeyEvent e) {
        if(e.getKeyCode() == KeyEvent.VK_TAB) {
            System.out.println(e.getModifiers());
            if(e.getModifiers() > 0) a.transferFocusBackward();
            else a.transferFocus(); 
            e.consume();
        }
    }

e.consume（） ; 可能是您错过的，以使其适用于您的情况。

e.consume(); might have been what you missed to make it work in your case.

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