JTable里的JComboBox在按空格键时不能显示下拉框

2015-03-02 04:21:57 182 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

从TI官方手册里挖细节：TPS5430负压电路那个不起眼却救命的Cd电容本文深入解析TPS5430负压电路中关键Cd电容的作用与设计要点，揭示其在DC-DC电源设计中的重要性。通过对比TI手册和实战案例，详细阐述Cd电容在高频电流回路、能量缓冲和噪声抑制中的核心功能，并提供选型与布局指南，帮助工程师避免芯片烧毁风险，提升电路稳定性。阅读详情

通常的JComboBox在获得焦点时按空格键会显示下拉框，
但是JTable里的JComboBox，按空格键没有反应
这是为什么
有没有办法实现JTable里的JComboBox也能在按空格键会显示下拉框

附实例代码



public class T1 extends JComboBox implements TableCellRenderer {

	public T1() {

		setBorder(BorderFactory.createEmptyBorder());

		

		addActionListener(new ActionListener(){



			@Override

			public void actionPerformed(ActionEvent e) {

				// TODO 自動生成されたメソッド・スタブ

				System.out.println("gggg");

			}

			

		});

		

	}



	public static void main(String[] args) {



		JFrame f = new JFrame();

		

//		try {

//			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

//		} catch (Exception e) {

//			e.printStackTrace();

//		}



		JComboBox comboBox = new JComboBox();

		comboBox.setBorder(BorderFactory.createEmptyBorder());

		comboBox.addItem("Item-1");

		comboBox.addItem("Item-2");

		comboBox.addItem("Item-3");

		comboBox.addItem("Item-4");

//		comboBox.addItem("Item-5");

		comboBox.setFocusable(true);

		

		DefaultCellEditor editor = new DefaultCellEditor(comboBox);

		



		JTable table = new JTable(5, 5);

		table.getColumnModel().getColumn(0).setCellRenderer(new T1());

		table.getColumnModel().getColumn(0).setCellEditor(editor);



		JScrollPane sp = new JScrollPane(table);

		

		f.getContentPane().add(sp, BorderLayout.CENTER);

		

		JComboBox cmb1 = new JComboBox();

		cmb1.setBorder(BorderFactory.createEmptyBorder());

		cmb1.addItem("Item-1");

		cmb1.addItem("Item-2");

		cmb1.addItem("Item-3");

		cmb1.addItem("Item-4");

		cmb1.addItem("Item-5");

//		cmb1.setFocusable(true);

		f.getContentPane().add(cmb1, BorderLayout.SOUTH);

		

		JComboBox cmb2 = new JComboBox();

		cmb2.setBorder(BorderFactory.createEmptyBorder());

		cmb2.addItem("Item-1");

		cmb2.addItem("Item-2");

		cmb2.addItem("Item-3");

		cmb2.addItem("Item-4");

		cmb2.addItem("Item-5");

		cmb2.setFocusable(true);

		f.getContentPane().add(cmb2, BorderLayout.NORTH);

		

		

		f.pack();

		f.setLocationRelativeTo(null);

		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		f.setVisible(true);

	}



	public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,

			int row, int column) {

		this.removeAllItems();

		this.addItem(value);



		return this;

	}

}