默认在摆动中选择文本

Question

有没有什么方法可以默认自动选择JTextField和JTextArea中的文本，当焦点获得事件发生时？

Answer 1

你在期待这样的事情吗

    class MyFocusTextField extends JTextField {
    {
        addFocusListener(new FocusListener() {

            @Override
            public void focusGained(FocusEvent e) {
                FocusTextField.this.select(0, getText().length());
            }

            @Override
            public void focusLost(FocusEvent e) {
                FocusTextField.this.select(0, 0);
            }
        });
    }
}

Answer 2

这就是你需要的：

jTextField1.selectAll();

以下更多：

jTextField1.addFocusListener(new FocusListener() {

        @Override
        public void focusGained(FocusEvent e) {
            if(jTextField1.getText().equals(initialText))
                //jTextField1.setText("");
                jTextField1.selectAll();
        }

        @Override
        public void focusLost(FocusEvent e) {
            if(jTextField1.getText().equals(""))
                jTextField1.setText("whatever");
        }
    });

Answer 3

你刚才说了怎么做--聚焦列表的焦点Gained事件。

然后，您可以通过FocusEvent的< code>getSource()方法获取焦点所在的JComponent，然后对其调用< code>selectAll()方法。

像这样的东西：

FocusAdapter selectAllFocusAdapter = new FocusAdapter() {
  public void focusGained(FocusEvent e) {
    final JTextComponent tComponent = (JTextComponent) e.getSource();
    SwingUtilities.invokeLater(new Runnable() {

      @Override
      public void run() {
        tComponent.selectAll();
      }
    });
    tComponent.selectAll();
  }
};

myJTextField.addFocusListener(selectAllFocusAdapter);
otherJTextField.addFocusListener(selectAllFocusAdapter);
myTextArea.addFocusListener(selectAllFocusAdapter);