java - 引用其他类添加MouseListener

Question

我想将 MouseListener 添加到扩展 JPanel 的类中。 Listener 引用另一个类，在该类中创建 JPanel 本身并将其添加到 contentPane。通过在 JPanel 上按鼠标，它应该被删除。它运行良好，但我无法调用 repaint() 因为我的删除方法是静态的。我该如何解决这个问题？

这是扩展类:

public class PanelDraggable extends JPanel {

public PanelDraggable () {

    .
    .
    .

    MouseInputAdapter closeMouseAdapter = new CloseMouseHandler();
    addMouseListener(closeMouseAdapter);

}


private class CloseMouseHandler extends MouseInputAdapter {

        public void mouseClicked(MouseEvent e) {

            TblManagement.RemoveTable();
        }
}

}

在这个类中，我想创建面板并删除它:

public void AddTables() {

    String dbShortName = combo.getSelectedItem().toString();
    String dbName = prop.get(dbNamesFile, dbShortName);

    int x = 50; int y = 150; int width = 150; int height = 220; //set Size and location 

    int [] indices = tblList.getSelectedIndices();

    panel = new PanelDraggable [indices.length];

    for (int i = 0; i < indices.length ; i++) {
        String tblName = tblList.getModel().getElementAt(i).toString();

        String sql = "SELECT `COLUMN_NAME` FROM `INFORMATION_SCHEMA`.`COLUMNS` WHERE "+
                 "`TABLE_SCHEMA`='"+dbName+"' AND `TABLE_NAME`='"+tblName+"'";

        JList<?> columnslist = new JList<String>();
        columnslist.setModel(getListModel(dbName, sql, 1));
        JScrollPane sc = new JScrollPane(columnslist);
        panel[i] = new PanelDraggable(x, y , width, height, tblName, sc);

        MouseInputAdapter mousehandler = new TableMouseHandler();
        panel[i].addMouseListener(mousehandler);

        mainPanel.add(panel[i]);
        x+=15;
        y+=20;

    }
    revalidate(); 
    repaint();
}

 private class TableMouseHandler extends MouseInputAdapter {

        public void mouseEntered(MouseEvent e) {

            removeComp = (JComponent) e.getComponent(); 
        }
 }

 public static void RemoveTable() {

     mainPanel.remove(removeComp);
 }

感谢您的帮助。

Answer 1

您需要将 TableManagement 类的实例作为每个面板的参数，这样您就不必在静态上下文中执行此操作。另外，我删除了您正在创建的 mouseAdapter 的不必要的子类，并以更可接受的方式创建了它们。

public class PanelDraggable extends JPanel {

    public PanelDraggable (..., final TableManagement tblManagement) {
        .
        .
        .
        addMouseListener(new MouseAdapter() {
            @Override
            public void (MouseEvent e) {
                tblManagement.removeTable();
            }
        });

    }
}

然后在您的 TableManagement 类中

public void AddTables() {

    String dbShortName = combo.getSelectedItem().toString();
    String dbName = prop.get(dbNamesFile, dbShortName);

    int x = 50; int y = 150; int width = 150; int height = 220; //set Size and location 

    int [] indices = tblList.getSelectedIndices();

    panel = new PanelDraggable [indices.length];

    for (int i = 0; i < indices.length ; i++) {
        String tblName = tblList.getModel().getElementAt(i).toString();

        String sql = "SELECT `COLUMN_NAME` FROM `INFORMATION_SCHEMA`.`COLUMNS` WHERE "+
                 "`TABLE_SCHEMA`='"+dbName+"' AND `TABLE_NAME`='"+tblName+"'";

        JList<?> columnslist = new JList<String>();
        columnslist.setModel(getListModel(dbName, sql, 1));
        JScrollPane sc = new JScrollPane(columnslist);

        // There is an extra argument here. Whatever your 
        // mainPanel used to be in the static method
        panel[i] = new PanelDraggable(x, y , width, height, tblName, sc, mainPanel);
        panel[i].addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered() {
                removeComp = (JComponent) e.getComponent();   
            }
        });

        mainPanel.add(panel[i]);
        x+=15;
        y+=20;

    }
    revalidate(); 
    repaint();
}

 public void RemoveTable() {
     this.remove(removeComp);
 }

旁注:您应该研究 Java 命名约定。只有类的第一个字符大写。