有没有一种方便的方法可以在 Swing JTable 中使用微调器作为编辑器？

Question

我处理的数字数据通常会向上或向下编辑 0.01*Value_of_variable，因此与通常的文本单元格相比，微调器看起来是一个不错的选择。

我看过 DefaultCellEditor 但它只接受文本字段、组合框或复选框。

有没有方便的方法来使用旋转器？

Answer 1

这是一个解决我在 camickr 的答案中评论的问题的示例。这是一个完整且可编译的示例。拿走你需要的，抛弃你不需要的。

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

public class JSpinnerInTables {
    static String[] columnNames = {
        "Name","Value"
    };
    static Object[][] data = {
        {"one",1.0},
        {"two",2.0}
    };
    public static void main( String[] args ) {
        JFrame frame = new JFrame();
        JTable table = new JTable(data,columnNames);
        //table.setSurrendersFocusOnKeystroke(true);
        TableColumnModel tcm = table.getColumnModel();
        TableColumn tc = tcm.getColumn(1);
        tc.setCellEditor(new SpinnerEditor());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(table);
        frame.pack();
        frame.setVisible(true);
    }
    public static class SpinnerEditor extends DefaultCellEditor
    {
        JSpinner spinner;
        JSpinner.DefaultEditor editor;
        JTextField textField;
        boolean valueSet;

        // Initializes the spinner.
        public SpinnerEditor() {
            super(new JTextField());
            spinner = new JSpinner();
            editor = ((JSpinner.DefaultEditor)spinner.getEditor());
            textField = editor.getTextField();
            textField.addFocusListener( new FocusListener() {
                public void focusGained( FocusEvent fe ) {
                    System.err.println("Got focus");
                    //textField.setSelectionStart(0);
                    //textField.setSelectionEnd(1);
                    SwingUtilities.invokeLater( new Runnable() {
                        public void run() {
                            if ( valueSet ) {
                                textField.setCaretPosition(1);
                            }
                        }
                    });
                }
                public void focusLost( FocusEvent fe ) {
                }
            });
            textField.addActionListener( new ActionListener() {
                public void actionPerformed( ActionEvent ae ) {
                    stopCellEditing();
                }
            });
        }

        // Prepares the spinner component and returns it.
        public Component getTableCellEditorComponent(
            JTable table, Object value, boolean isSelected, int row, int column
        ) {
            if ( !valueSet ) {
                spinner.setValue(value);
            }
            SwingUtilities.invokeLater( new Runnable() {
                public void run() {
                    textField.requestFocus();
                }
            });
            return spinner;
        }

        public boolean isCellEditable( EventObject eo ) {
            System.err.println("isCellEditable");
            if ( eo instanceof KeyEvent ) {
                KeyEvent ke = (KeyEvent)eo;
                System.err.println("key event: "+ke.getKeyChar());
                textField.setText(String.valueOf(ke.getKeyChar()));
                //textField.select(1,1);
                //textField.setCaretPosition(1);
                //textField.moveCaretPosition(1);
                valueSet = true;
            } else {
                valueSet = false;
            }
            return true;
        }

        // Returns the spinners current value.
        public Object getCellEditorValue() {
            return spinner.getValue();
        }

        public boolean stopCellEditing() {
            System.err.println("Stopping edit");
            try {
                editor.commitEdit();
                spinner.commitEdit();
            } catch ( java.text.ParseException e ) {
                JOptionPane.showMessageDialog(null,
                    "Invalid value, discarding.");
            }
            return super.stopCellEditing();
        }
    }
}

Answer 2

...并覆盖 getCellEditorValue() 方法：

class SpinnerEditor extends DefaultCellEditor
{
    private JSpinner spinner;

    public SpinnerEditor()
    {
        super( new JTextField() );
        spinner = new JSpinner(new SpinnerNumberModel(0, 0, 100, 5));
        spinner.setBorder( null );
    }

    public Component getTableCellEditorComponent(
        JTable table, Object value, boolean isSelected, int row, int column)
    {
        spinner.setValue( value );
        return spinner;
    }

    public Object getCellEditorValue()
    {
        return spinner.getValue();
    }
}

Answer 3

只需扩展 DefaultCellEditor 并覆盖 getTableCellEditorComponent() 方法即可返回 JSpinner。

Answer 4

杰森的回答是完美的。为了帮助其他可能正在寻找时间和日期版本的人，我编辑了 Jason 的代码以适应。希望它能帮助别人，就像杰森帮助我一样。

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

public class SpinnerInJTable {
static String[] columnNames = {
    "Name","Time & Date"
};
static Object[][] data = {
    {"Date One",new Date(Long.decode("1397091313404"))},
    {"Date Two", new Date(Long.decode("1397001313404"))}
};
public static void main( String[] args ) {
    JFrame frame = new JFrame();
    JTable table = new JTable(data,columnNames);
    //table.setSurrendersFocusOnKeystroke(true);
    TableColumnModel tcm = table.getColumnModel();
    TableColumn tc = tcm.getColumn(1);
    tc.setCellEditor(new SpinnerEditor());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(table);
    frame.pack();
    frame.setVisible(true);
}
public static class SpinnerEditor extends DefaultCellEditor
{
    JSpinner spinner;
    JSpinner.DefaultEditor editor;
    JTextField textField;
    boolean valueSet;

    // Initializes the spinner.
    public SpinnerEditor() {
        super(new JTextField());
        spinner = new JSpinner(new SpinnerDateModel());
        editor = ((JSpinner.DateEditor)spinner.getEditor());
        textField = editor.getTextField();
        textField.addFocusListener( new FocusListener() {
            public void focusGained( FocusEvent fe ) {
                System.err.println("Got focus");
                //textField.setSelectionStart(0);
                //textField.setSelectionEnd(1);
                SwingUtilities.invokeLater( new Runnable() {
                    public void run() {
                        if ( valueSet ) {
                            textField.setCaretPosition(1);
                        }
                    }
                });
            }
            public void focusLost( FocusEvent fe ) {
            }
        });
        textField.addActionListener( new ActionListener() {
            public void actionPerformed( ActionEvent ae ) {
                stopCellEditing();
            }
        });
    }

    // Prepares the spinner component and returns it.
    public Component getTableCellEditorComponent(
        JTable table, Object value, boolean isSelected, int row, int column
    ) {
        if ( !valueSet ) {
            spinner.setValue(value);
        }
        SwingUtilities.invokeLater( new Runnable() {
            public void run() {
                textField.requestFocus();
            }
        });
        return spinner;
    }

    public boolean isCellEditable( EventObject eo ) {
        System.err.println("isCellEditable");
        if ( eo instanceof KeyEvent ) {
            KeyEvent ke = (KeyEvent)eo;
            System.err.println("key event: "+ke.getKeyChar());
            textField.setText(String.valueOf(ke.getKeyChar()));
            //textField.select(1,1);
            //textField.setCaretPosition(1);
            //textField.moveCaretPosition(1);
            valueSet = true;
        } else {
            valueSet = false;
        }
        return true;
    }

    // Returns the spinners current value.
    public Object getCellEditorValue() {
        return spinner.getValue();
    }

    public boolean stopCellEditing() {
        System.err.println("Stopping edit");
        try {
            editor.commitEdit();
            spinner.commitEdit();
        } catch ( java.text.ParseException e ) {
            JOptionPane.showMessageDialog(null,
                "Invalid value, discarding.");
        }
        return super.stopCellEditing();
    }
}

}