java 如何使用 Container 添加填充？

How do I add padding with Container?

提问by ring bearer

I am trying to make on top some padding but how to do this with Container?

我正在尝试在顶部填充一些填充，但如何使用 Container 做到这一点？

    JFrame frame = super.screen.getFullScreenWindow();
    //Container contentPane = frame.getContentPane();
    //JPanel contentPane = new JPanel();

    // Make sure the content pane is transparent
    if (contentPane instanceof JComponent) {
        ((JComponent)contentPane).setOpaque(false);
    } 
    else {
      // ??
    }

    contentPane.setBorder(new EmptyBorder(10, 10, 10, 10) );
    //frame.getContentPane().add(contentPane, BorderLayout.CENTER);

Output

输出

 [javac] symbol  : method setBorder(javax.swing.border.EmptyBorder)
 [javac] location: class java.awt.Container 
 [javac] contentPane.setBorder(new EmptyBorder(10, 10, 10, 10) );
 [javac]

采纳答案by mre

You can override Container#getInsets, although you should be using Swing components.

您可以覆盖Container#getInsets，但您应该使用 Swing 组件。

回答by ring bearer

Can't you simply add a JPanel to contain everything and set empty border on that ?

您不能简单地添加一个 JPanel 来包含所有内容并在其上设置空边框吗？

 JPanel containerPanel = new JPanel();
 containerPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
 containerPanel.setLayout(new BorderLayout());
 //panel to test
 JPanel testPanel = new JPanel();
 testPanel.setBackground(Color.blue);        
 containerPanel.add(testPanel,BorderLayout.CENTER);

 //assuming you are extending JFrame
 getContentPane().setLayout(new BorderLayout());
 getContentPane().add(containerPanel, BorderLayout.CENTER);

回答by mKorbel

• JFrame / Frameand its ContentPanedoesn't implements Borders, this is prehistoric Componenet

• put directly there JPanelwith EmptyBorders

• for Java5and higher isn't required to call for ContentPane(only for setBackground:-), you can directly add JComponentsto the JFrame#add(myJComponent), notice Swing Top-Level Containershave got implemented BorderLayoutby default

• JFrame / Frame它ContentPane没有实现Borders，这是史前的Componenet

• 直接就把那里JPanel有EmptyBorders

• forJava5和更高的不需要调用ContentPane（仅 for setBackground:-)，您可以直接添加JComponents到JFrame#add(myJComponent)，通知默认Swing Top-Level Containers已实现BorderLayout

回答by Snicolas

don't you prefer to use swing ? Components have a method to add margins. Swing is far better than the obsolete awt library.

你不喜欢使用swing吗？组件具有添加边距的方法。Swing 比过时的 awt 库要好得多。