获取gridlayout上按钮的位置

时间:2014-03-22 16:23:51

标签: java arrays swing jbutton mouselistener

如何获得带有gridlayout的点击按钮的位置(我的意思是行和列)?

public void init(final Container pane) {
    JPanel controls = new JPanel();
    int size = (int) Math.sqrt(puzzle.getSize() + 1);
    controls.setLayout(new GridLayout(size, size));
    for (int i = 0; i < puzzle.getSize(); i++) {
        int k = puzzle.getListItem(i);
        if (k == puzzle.getEmptyFlag())
            controls.add(new JLabel(""));
        else {
            JButton jb = new JButton(String.valueOf(k));
            jb.addMouseListener(new MouseAdapter() {

                @Override
                public void mouseClicked(MouseEvent e) {
                    //get row and column
                }

            });
            controls.add(jb);
        }
    }
    pane.add(controls);
}

2 个答案:

答案 0 :(得分:3)

  1. 永远不要在JButton上添加MouseListener用于此目的。改为使用ActionListener。
  2. 为什么不创建JButton的数组或ArrayList,然后简单地遍历列表以找到合适的数组?
  3. 即,

    private JButton[][] buttonGrid = new JButton[ROWS][COLS];
    

    在其他地方,您需要使用可行的JButton对象填充网格,并将这些JButton放入GUI中。

    然后在程序中使用嵌套for循环迭代网格,将网格按钮与getSource() JButton进行比较。

    即。在JButton的ActionListener

    public void actionPerformed(ActionEvent e) {
      for (int row = 0; row < ROWS; row++) {
        for (int col = 0; col < COLS; col++) {
           if buttonGrid[row][col] == e.getSource();
           // here you have your row and column
        }
      }
    }
    

    修改
    你问:

      
        
    1. 为什么?
    2.   

    因为在许多情况下它无法正常工作。 ActionListeners已经构建为专门用于JButtons和JMenuItems,并且具有使这个功能很好地工作的机制。例如,假设您决定只在用户填充两个JTextField后启用JButton,并且使用JButton的setEnabled(boolean enabled)方法执行此操作,禁用JButton将不会阻止MouseListener工作,但它将停止ActionListener。


    修改2

    例如,

    import java.awt.GridLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import javax.swing.*;
    
    public class ButtonGridEg extends JPanel {
       private static final int ROWS = 8;
       private static final int COLS = ROWS;
       private static final int GAP = 5;
       private JButton[][] buttonGrid = new JButton[ROWS][COLS];
    
       public ButtonGridEg() {
          setLayout(new GridLayout(ROWS, COLS, GAP, GAP));
    
          ActionListener buttonListener = new ActionListener() {
    
             @Override
             public void actionPerformed(ActionEvent evt) {
                JButton selectedBtn = (JButton) evt.getSource();
                for (int row = 0; row < buttonGrid.length; row++) {
                   for (int col = 0; col < buttonGrid[row].length; col++) {
                      if (buttonGrid[row][col] == selectedBtn) {
                         System.out.printf("Selected row and column: %d %d%n", row, col);
                      }
                   }
                }
             }
          };
          for (int row = 0; row < buttonGrid.length; row++) {
             for (int col = 0; col < buttonGrid[row].length; col++) {
                String text = String.format("Button [%d, %d]", row, col);
                buttonGrid[row][col] = new JButton(text);
                buttonGrid[row][col].addActionListener(buttonListener);
                add(buttonGrid[row][col]);
             }
          }
       }
    
       private static void createAndShowGui() {
          ButtonGridEg mainPanel = new ButtonGridEg();
    
          JFrame frame = new JFrame("ButtonGridEg");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.getContentPane().add(mainPanel);
          frame.pack();
          frame.setLocationByPlatform(true);
          frame.setVisible(true);
       }
    
       public static void main(String[] args) {
          SwingUtilities.invokeLater(new Runnable() {
             public void run() {
                createAndShowGui();
             }
          });
       }
    }
    

答案 1 :(得分:2)

在这种情况下,您甚至不必搜索索引,因为您在创建按钮时就知道它们了:

for (int i = 0; i < puzzle.getSize(); i++) {
    int k = puzzle.getListItem(i);
    if (k == puzzle.getEmptyFlag())
        controls.add(new JLabel(""));
    else {
        JButton jb = new JButton(String.valueOf(k));

        final int rowIndex = i / size;
        final int columnIndex = i % size;

        // Using an ActionListener, as Hovercraft Full Of Eels already told you:
        jb.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println("rowIndex "+rowIndex+" columnIndex "+columnIndex);
            }

        });
        controls.add(jb);
    }
}