Question

我在JTable中遇到光标问题。我试图在论坛中找到答案，但找不到我期望的答案。这是我的可运行Java：

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.EmptyBorder;
import javax.swing.table.AbstractTableModel;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.SwingConstants;
import javax.swing.JTable;

public class Fpos extends JFrame {

        public static void main(String[] args) {
                EventQueue.invokeLater(new Runnable() {
                        public void run() {
                                try {
                                    Fpos frame = new Fpos();
                                    frame.setVisible(true);
                                    frame.setLocationRelativeTo(null);  //make frame center of screen                   
                                } catch (Exception e) {
                                    e.printStackTrace();
                                }
                        }
                });
        }


        public Fpos() {
                //create Jpanel
                setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                setBounds(10, 10, 1300, 700);
                JPanel contentPane = new JPanel();
                contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
                setContentPane(contentPane);
                contentPane.setLayout(null);
                //create label TOTAL
                JLabel lblTotal = new JLabel("TOTAL : Rp.");
                lblTotal.setFont(new Font("Wide Latin", Font.PLAIN, 30));
                lblTotal.setBounds(33, 25, 312, 31);
                contentPane.add(lblTotal);
                //create label Total Amount
                JLabel lblNewLabel = new JLabel("123,456,789");
                lblNewLabel.setHorizontalAlignment(SwingConstants.RIGHT);
                lblNewLabel.setFont(new Font("Wide Latin", Font.PLAIN, 60));
                lblNewLabel.setBounds(571, 6, 659, 61);
                contentPane.add(lblNewLabel);
                //create jtable in scrollpane
                 JTable table = new JTable(new MyTableModel());                 
                 JScrollPane sp=new JScrollPane(table);
                 sp.setBounds(20,76,1240,572);
                 contentPane.add(sp);            
        }

    //tablemodel
    class MyTableModel extends AbstractTableModel {
            private String[] columnNames = {"PLU", "NAME", "UOM", "QTY", "PRICE","AMOUNT"};
            private Object[][] data = {{"", "", "", new Double(0), new Integer(0), new Integer(0)}};    
            public int getColumnCount() {return columnNames.length;}
            public int getRowCount() {return data.length;}
//          public String getColumnName(int col) {return columnNames[col];}
            public Object getValueAt(int row, int col) {return data[row][col];}
            //auto formating table: string=left alignment, numeric=right alignment, checkbox=check box not true/false
            public Class getColumnClass(int c) {return getValueAt(0, c).getClass();}
            //make table editable only for just first column        
            public boolean isCellEditable(int row, int col) {if (col == 0) {return true;} else{return false;}}
            //make table can change value         
            public void setValueAt(Object value, int row, int col) {
                    data[row][col] = value;
                    fireTableCellUpdated(row, col);
            }
    }

}

输出很好但是表格还没准备好输入。我必须双击PLU第一行的列以准备输入。我想要的是，一旦我运行它，光标在PLU第一行闪烁，准备输入而不是双击它。

有关如何实现这一目标的任何建议吗？

Answer 1

基础知识将是：

table.changeSelection(0, 0, false, false);

if (table.editCellAt(0, 0))
{
    Component editor = table.getEditorComponent();
    editor.requestFocusInWindow();
    //((JTextComponent)editor).selectAll();
}

changeSelection(...)就像点击该行（因此整个行突出显示），然后editCellAt(...)将单元格置于编辑模式。

然后您需要将焦点放在编辑器上，并可选择选择所有文本，以便在您键入时将其替换。

编辑：

光标仍然没有闪烁

将代码包裹在SwingUtilities.invokeLater(...)中以确保代码在框架可见后执行：

SwingUtilities.invokeLater(new Runnable()
{
    public void run()
    {
        table.changeSelection(0, 1, false, false);

        if (table.editCellAt(0, 1))
        {
            Component editor = table.getEditorComponent();
            editor.requestFocusInWindow();
            //((JTextComponent)editor).selectAll();
        }
    }
});

Answer 2

是的，添加的代码会使光标在选定的单元格n上闪烁，以便为输入做好准备。

非常感谢Camickr。

我将下面的可运行代码放在下面，万一有人碰巧遇到同样的情况。

import java.awt.Component;

import java.awt.EventQueue;

导入javax.swing.JFrame;

导入javax.swing.JPanel;

导入javax.swing.JScrollPane;

导入javax.swing.border.EmptyBorder;

import javax.swing.table.AbstractTableModel;

导入javax.swing.JLabel;

import java.awt.Font;

导入javax.swing.SwingConstants;

导入javax.swing.SwingUtilities;

导入javax.swing.JTable;

public class test扩展了JFrame {

    public static void main(String[] args) {
            EventQueue.invokeLater(new Runnable() {
                    public void run() {
                            try {
                                test frame = new test();
                                frame.setVisible(true);
                                frame.setLocationRelativeTo(null);  //make frame center of screen                   
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                    }
            });
    }


    public test() {
            //create Jpanel
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setBounds(10, 10, 1300, 700);
            JPanel contentPane = new JPanel();
            contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
            setContentPane(contentPane);
            contentPane.setLayout(null);
            //create label TOTAL
            JLabel lblTotal = new JLabel("TOTAL : Rp.");
            lblTotal.setFont(new Font("Wide Latin", Font.PLAIN, 30));
            lblTotal.setBounds(33, 25, 312, 31);
            contentPane.add(lblTotal);
            //create label Total Amount
            JLabel lblNewLabel = new JLabel("123,456,789");
            lblNewLabel.setHorizontalAlignment(SwingConstants.RIGHT);
            lblNewLabel.setFont(new Font("Wide Latin", Font.PLAIN, 60));
            lblNewLabel.setBounds(571, 6, 659, 61);
            contentPane.add(lblNewLabel);
            //create jtable in scrollpane
             JTable table = new JTable(new MyTableModel());                 
             JScrollPane sp=new JScrollPane(table);
             sp.setBounds(20,76,1240,572);
             contentPane.add(sp);
            //make cursor blinking on selected cell
             SwingUtilities.invokeLater(new Runnable(){
                    public void run() {
                          table.changeSelection(0, 0, false, false);
                          if (table.editCellAt(0, 0)){
                              Component editor = table.getEditorComponent();
                              editor.requestFocusInWindow();
                              //((JTextComponent)editor).selectAll();
                          }
                    }
            });

    }

//tablemodel
class MyTableModel extends AbstractTableModel {
        private String[] columnNames = {"PLU", "NAME", "UOM", "QTY", "PRICE","AMOUNT"};
        private Object[][] data = {{"", "", "", new Double(0), new Integer(0), new Integer(0)}};    
        public int getColumnCount() {return columnNames.length;}
        public int getRowCount() {return data.length;}

// public String getColumnName（int col）{return columnNames [col];} public Object getValueAt（int row，int col）{return data [row] [col];} //自动格式化表：string =左对齐，数字=右对齐，复选框=复选框不是真/假 public class getColumnClass（int c）{return getValueAt（0，c）.getClass（）;} //使表格仅适用于第一列 public boolean isCellEditable（int row，int col）{if（col == 0）{return true;} else {return false;}} // make table可以改变值
public void setValueAt（Object value，int row，int col）{ data [row] [col] = value; fireTableCellUpdated（row，col）; } }

}

光标在jtable中自动闪烁，无需鼠标点击

2 个答案: