Question

我正在尝试创建一个GridBagLayout，我已经按照我想要的方式设置了面板。但是，如果不强制所有组件居中，我也无法设置每个面板的背景颜色。

这里面板是彩色的，但所有组件都是中心 http://i.imgur.com/BattBdw.png

此处所有组件都按照代码中的指定捕捉到NORTHWEST，但背景颜色不会填充窗格。 http://i.imgur.com/lvuEy4u.png

对不起，我无法嵌入图片，我的声誉不够高:(

    GridBagConstraints GBC = new GridBagConstraints();
    GBC.fill = GridBagConstraints.BOTH;
    GBC.anchor = GridBagConstraints.NORTHWEST;



    //green panel
    GBC.gridx = 0;
    GBC.gridy = 0;
    GBC.weightx = 0.1;
    GBC.weighty = 0.1;      

    JPanel panelGreen = new JPanel();
    panelGreen.setBackground(Color.green);          

    //add button to green panel
    JButton button = new JButton("Button");
    panelGreen.add(button, GBC);

    contentPane.add(panelGreen, GBC);



    //blue panel
    GBC.gridx = 1;
    GBC.gridy = 0;
    GBC.weighty = 0.1;  
    GBC.weightx = 0.9;      

    JPanel panelBlue = new JPanel();
    panelBlue.setBackground(Color.blue);        
    contentPane.add(panelBlue, GBC);




    //red panel
    GBC.gridx = 0;
    GBC.gridy = 1;      
    GBC.weighty = 0.8;
    GBC.weightx = 0.1;

    JPanel panelRed = new JPanel();
    panelRed.setBackground(Color.red);  
    contentPane.add(panelRed, GBC);



    //black panel
    GBC.gridx = 0;
    GBC.gridy = 2;      
    GBC.weighty = 0.1;
    GBC.weightx = 0.1;
    GBC.gridwidth =2;   

    JPanel panelBlack = new JPanel();
    panelBlack.setBackground(Color.black);          
    contentPane.add(panelBlack, GBC);




    //yellow panel
    GBC.gridx = 1;
    GBC.gridy = 1;      
    GBC.weighty = 0.8;
    GBC.weightx = 0.9;
    GBC.gridwidth =1;   

    JPanel panelYellow = new JPanel();
    panelYellow.setBackground(Color.yellow);        
    contentPane.add(panelYellow, GBC);

Answer 1

首先，使用默认构造函数创建JPanel（）意味着它获取FlowLayout - 您需要告诉您的面板使用GridBagLayouts：

JPanel panelGreen = new JPanel(new GridBagLayout());

除此之外，您只需要在添加JButton时将“fill”属性设置为NONE，否则它将展开以填充整个窗格。添加完按钮后，您可以将其设置为BOTH以获取面板本身：

GBC.fill = GridBagConstraints.NONE;
JButton button = new JButton("Button");
panelGreen.add(button, GBC);

GBC.fill = GridBagConstraints.BOTH;
contentPane.add(panelGreen, GBC);

Java GridBagLayout组件以后台填充为中心

1 个答案: