java - jtable中光标自动闪烁，无需点击鼠标

Question

我在 JTable 中遇到光标问题。 我试图在论坛中寻找答案，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，但表格尚未准备好输入。 我必须双击列 PLU 第一行才能准备输入。 我想要的是，一旦运行它，光标就会在 PLU 列第一行处闪烁，准备好输入，而无需双击它。

关于如何实现这一目标有什么建议吗？

Answer 1

基础知识是:

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

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

changeSelection(...) 就像单击该行(因此整行都会突出显示)，然后 editCellAt(...) 放置单元格在编辑模式下。

然后，您需要将焦点放在编辑器上，并可以选择选择所有文本，以便在您键入时可以替换它。

编辑:

The cursor is still not blinking

将代码包装在 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();
        }
    }
});