使用 NetBeans 与 Eclipse 进行 Java 布局定位

Question

我正在尝试创建一个简单的幻灯片程序，例如 Powerpoint。为了设计它的 GUI，我使用了 Netbeans，然后将 GUI 代码从 Netbeans 复制到 Eclipse。

Netbeans 生成了以下代码：

    pg = new javax.swing.JPanel();
    jScrollPane1 = new javax.swing.JScrollPane();
    jPanel1 = new javax.swing.JPanel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setBackground(new java.awt.Color(153, 153, 153));

    pg.setBackground(new java.awt.Color(255, 255, 255));
    pg.setForeground(new java.awt.Color(255, 255, 255));
    pg.setPreferredSize(new java.awt.Dimension(255, 234));

    javax.swing.GroupLayout pgLayout = new javax.swing.GroupLayout(pg);
    pg.setLayout(pgLayout);
    pgLayout.setHorizontalGroup(
        pgLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 357, Short.MAX_VALUE)
    );
    pgLayout.setVerticalGroup(
        pgLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 257, Short.MAX_VALUE)
    );

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 62, Short.MAX_VALUE)
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 279, Short.MAX_VALUE)
    );


    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(pg, javax.swing.GroupLayout.DEFAULT_SIZE, 357, Short.MAX_VALUE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(pg, javax.swing.GroupLayout.DEFAULT_SIZE, 257, Short.MAX_VALUE)
            .addContainerGap())
    );

    pack();

我的问题是，我想将右侧的 jPanel1 更改为我自己的扩展 JPanel 的类。为此，我写道：

JPanel jPanel1 = new JPanel();  
jPanel1.add(new ToolBoxGUI("ToolBox"));

但是当我运行代码时，右侧没有 ToolBoxGUI 类按钮。我应该如何解决这个问题？

Answer 1

jPanel1 使用 GroupLayout。为了可见，您的 ToolBoxGUI 必须添加到此 GroupLayout 中。如果您想要使 ToolBoxGUI 成为 jPanel1 的唯一组件，则删除设置 jPanel1 布局的代码：

javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
    jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGap(0, 62, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
    jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGap(0, 279, Short.MAX_VALUE)
);

并将其替换为

jPanel1.setLayout(new BorderLayout());

或者，如果您想用 ToolBoxGUI 替换 jPanel1，请删除与上面相同的代码，然后初始化 jPanel1

jPanel1 = new ToolBoxGUI();