让JSpinner的选择文本时聚焦(Make JSpinner Select Text When F

我想改变JSpinner的行为，所以，当你点击文本，它选择它。这使得它更容易与所需的值替换该字段。不幸的是，我不能让行为的工作，而是，它只是插入光标在文本而不选择什么已经存在。

我曾尝试加入的焦点监听双方的JSpinner本身和文本区域本身，通过((DefaultEditor) this.getEditor()).getTextField()但这些都不似乎有预期的效果。我的代码（对于JSpinner的本身）如下：

spinner.addFocusListener(new FocusAdapter(){
            @Override
            public void focusGained(FocusEvent e) {
                ((DefaultEditor) ((JSpinner) e.getSource()).getEditor()).getTextField().selectAll();
            }
        });

我不知道是什么问题。如果它的事项，我运行Mac OS 10.7.5和Java 6u43。

编辑：我把System.out.println就在focusGained方法开始，发现这是从来没有叫。所以看起来越来越注重的JSpinner没有注册。同样，我试图把focusAdpater两个微调器和文本字段（不是在同一时间虽然）。

Answer 1:

多，你所面临的问题与微调如何验证微调中的任何值的焦点事件（和其他几个州的事件），这将规避亮点后做。

MacOS的更糟。

我落得这样做开始什么Thread是等待了很短的时间（约25毫秒），然后用SwingUtilities.invokeLater实际执行的选择...

更新了一个例子

import java.awt.Component;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.JTextComponent;

public class AutoFocusSpinner {

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

    public static final SelectOnFocusGainedHandler SHARED_INSTANCE = new SelectOnFocusGainedHandler();

    public AutoFocusSpinner() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JSpinner spinner = new JSpinner(new SpinnerNumberModel(1, 0, 100, 1));
                installFocusListener(spinner);

                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new GridBagLayout());
                frame.add(spinner);
                frame.add(new JButton("Here for testing"));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

        });
    }

    public void installFocusListener(JSpinner spinner) {

        JComponent spinnerEditor = spinner.getEditor();

        if (spinnerEditor != null) {

            // This is me spending a few days trying to make this work and 
            // eventually throwing a hissy fit and just grabbing all the 
            // JTextComponent components contained within the editor....
            List<JTextComponent> lstChildren = findAllChildren(spinner, JTextComponent.class);
            if (lstChildren != null && lstChildren.size() > 0) {

                JTextComponent editor = lstChildren.get(0);
                editor.addFocusListener(SHARED_INSTANCE);

            }

        }

    }

    public static <T extends Component> List<T> findAllChildren(JComponent component, Class<T> clazz) {

        List<T> lstChildren = new ArrayList<T>(5);
        for (Component comp : component.getComponents()) {

            if (clazz.isInstance(comp)) {

                lstChildren.add((T) comp);

            } else if (comp instanceof JComponent) {

                lstChildren.addAll(findAllChildren((JComponent) comp, clazz));

            }

        }

        return Collections.unmodifiableList(lstChildren);

    }

    public static class SelectOnFocusGainedHandler extends FocusAdapter {

        @Override
        public void focusGained(FocusEvent e) {

            Component comp = e.getComponent();
            if (comp instanceof JTextComponent) {
                final JTextComponent textComponent = (JTextComponent) comp;
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            Thread.sleep(25);
                        } catch (InterruptedException ex) {
                        }
                        SwingUtilities.invokeLater(new Runnable() {
                            @Override
                            public void run() {
                                textComponent.selectAll();
                            }
                        });
                    }
                }).start();
            }            
        }        
    }
}

现在，一下吧，我祈祷了一些非常不错的，简单的，没有证件，我们可以设置将意味着我们不需要做这一切特性：P

Answer 2:

不知道的是Mac，但我在Windows上使用此代码：

JSpinner.DefaultEditor editor = (JSpinner.DefaultEditor)spinner.getEditor();
JTextField textField = editor.getTextField();
textField.addFocusListener( new FocusAdapter()
{
    public void focusGained(final FocusEvent e)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                JTextField tf = (JTextField)e.getSource();
                tf.selectAll();
            }
        });

    }

});

我也用这个代码在JFormattedTextField上选择文本。