JAVASwing GridBagLayout 布局

用GridBagLayout可实现复杂可控的布局。

以一个输入框为例：

       final  JTextField   username = new JTextField();
       final  JTextField   password = new JTextField();
       JPanel  regist = new JPanel();
       regist.setLayout(new GridBagLayout());
       regist.add(new JLabel("username:"),
                    new GridBagConstraints(0,0,1,1,
                                           0.0,0.0,
                                           GridBagConstraints.CENTER,
                                           GridBagConstraints.NONE,
                                           new Insets(2,2,2,2),
                                           0,0));
       <pre name="code" class="java">       </pre>

       regist.add(username,
                    new GridBagConstraints(1,0,1,1,
                                           0.0,0.0,
                                           GridBagConstraints.CENTER,
                                           GridBagConstraints.NONE,
                                           new Insets(2,2,2,2),
                                           200,0));
       <pre name="code" class="java"><pre name="code" class="java">       regist.add(new JLabel("password"),
                    new GridBagConstraints(0,1,1,1,
                                           0.0,0.0,
                                           GridBagConstraints.CENTER,
                                           GridBagConstraints.NONE,
                                           new Insets(2,2,2,2),
                                           0,0));</pre></pre>

<pre name="code" class="java"><pre name="code" class="java"><pre name="code" class="java">       regist.add(password,
                    new GridBagConstraints(1,1,1,1,
                                           0.0,0.0,
                                           GridBagConstraints.CENTER,
                                           GridBagConstraints.NONE,
                                           new Insets(2,2,2,2),
                                           200,0));</pre></pre></pre>

 

 

这里面用到了GridBagConstraints 来定义组件的位置排列信息。

 

最终的效果如下：

后面输入框的长度可以修改值200 来改变。

具体GridBagConstraints 可参见GridBagConstraints