java - 如何统计整个jPanel的点击次数？

Question

我正在寻找这个问题的答案:如何计算整个 jPanel 上的点击次数？下面的代码仅计算一个像素上的点击次数。

public class NewJFrame extends javax.swing.JFrame {


    public NewJFrame() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                formMouseClicked(evt);
            }
        });

        jPanel1.setBackground(new java.awt.Color(255, 255, 255));
        jPanel1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jPanel1MouseClicked(evt);
            }
        });
        jPanel1.setLayout(new java.awt.BorderLayout());

        jLabel1.setText("Zapraszamy do klieknięcia");

        jButton1.setText("Algorytm przyrostowy");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(162, 162, 162)
                        .addComponent(jLabel1))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(74, 74, 74)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jButton1)
                            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 237, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addContainerGap(89, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(22, 22, 22)
                .addComponent(jLabel1)
                .addGap(31, 31, 31)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 139, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jButton1)
                .addContainerGap(53, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    private void jPanel1MouseClicked(java.awt.event.MouseEvent evt) {                                     
        // TODO add your handling code here:
        int clicks = evt.getClickCount();
        int x = evt.getX();
        int y = evt.getY();


        System.out.println("Kliknołeś");

        double x1, y1, x2, y2;
        System.out.println("Współrzędne x: "+ x + ", y: "+ y + " Kliknoles: " + clicks);

    }                                    

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        System.out.println("Kliknołeś JBUTTon");
    }                                        

    private void formMouseClicked(java.awt.event.MouseEvent evt) {
        // TODO add your handling code here:
    }

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JPanel jPanel1;
}

Answer 1

Code below counts clicks only on the one pixel.

实际上不是，它计算与事件关联的点击次数。例如，如果操作系统将其报告为双击，则该值将为 2。通常，这是基于点击之间的延迟，但最终取决于操作系统。

MouseEvent.getClickCount() :

Returns the number of mouse clicks associated with this event.

Returns:
   integer value for the number of clicks

您是否试图跟踪 JPanel 上发生的点击次数？如果是这样，我将添加一个鼠标监听器并保留一个随着每次单击而递增的变量。

//instance variable somewhere
int clickCount = 0;

//after you create your panel
panel.addMouseListener(new MouseAdapter() {
    public void mouseClicked(MouseEvent e) { 
        clickCount++;
    }
});

编辑

tutorial on writing Mouse Listeners也相关:

int getClickCount()   

Returns the number of quick, consecutive clicks the user has made (including this event). For example, returns 2 for a double click.

正如本文所暗示的，Java 不会将连续点击聚合到单个事件中...如果您收到 getClickCount() 等于 1 的点击事件，则该一次点击可能仍然是第一次点击按代表双击的点击顺序。