GridBagLayout无法正确布局

时间:2013-06-28 19:16:34

标签: java swing layout-manager gridbaglayout

我是GridBagLayout的新手,但我尝试使用标准惯例 找到哪个是在一张网格纸上绘制我的想法,然后尝试将网格值转换成网格包......

我的目标是制作如下所示的布局:

Desired layout

目前看起来像这样:

Actual layout

任何想法都是为什么?

如果您想到左上角为0,0的网格,我正在寻找的确切尺寸 对

  1. 目标图片中面板中的红色:从第0列开始,跨越10列,高度为1行
  2. 表示黑色面板:从第0列开始,第1行,跨度10列,高度为20行
  3. 表示蓝色面板:从第0列第21行开始,跨越10列,高度为1
  4. 表示绿色列:从第10列开始,第0行,第16列,第7列,高度为7
  5. 表示紫色列:从第10列开始,第7行,第16列,第16列,高度为16
  6. 这是我的源代码:

    GBC是一个扩展GridBagConstraints的辅助类,使用的构造函数是

    GBC(int startingX,int startingY,int width,int height)

     /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    
    import java.awt.Color;
    import java.awt.EventQueue;
    import java.awt.GridBagLayout;
    import java.awt.Rectangle;
    import javax.swing.JApplet;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    
    public class Demo extends JApplet
    {
    
        JPanel panel1 = new JPanel();
        JPanel panel2 = new JPanel();
        JPanel panel3 = new JPanel();
        JPanel panel4 = new JPanel();
        JPanel panel5 = new JPanel();
    
        public void init()
        {
            EventQueue.invokeLater(new Runnable()
            {
                public void run()
                {
                    initComponents();
                }
            });
        }
    
        public void initComponents()
        {
            //set the layout of the content pane to gridbag layout
            GridBagLayout gridBag = new GridBagLayout();
            getContentPane().setLayout(gridBag);
    
            Rectangle rect = getContentPane().getBounds();
    
            panel1.setBackground(Color.green);
            panel2.setBackground(Color.black);
            panel3.setBackground(Color.red);
            panel4.setBackground(Color.orange);
            panel5.setBackground(Color.yellow);
    
            add(panel4, new GBC(10, 0, 16, 7).setFill(GBC.BOTH).setWeight(1.0, 1.0));
            add(panel1, new GBC(0, 0, 10, 1).setFill(GBC.BOTH).setWeight(1.0, 1.0));
            add(panel3, new GBC(0, 21, 10, 1).setFill(GBC.BOTH).setWeight(1.0, 1.0));
            add(panel2, new GBC(0, 1, 10, 20).setFill(GBC.BOTH).setWeight(1.0, 1.0));
            add(panel5, new GBC(10, 7, 16, 16).setFill(GBC.BOTH).setWeight(1.0, 1.0));
        }
    }
    

    任何帮助将不胜感激(但请解释你的逻辑)

1 个答案:

答案 0 :(得分:4)

您可以使用GridBagLayout轻松完成此操作。

考虑contentPane GridBagLayout作为其布局,您现在可以将JPanel分为三个部分。单个左侧JPanel(使用GridBagLayout,其中包含REDBLACKBLUE JPanel s),右侧包含两个JPanel s,即GREENMAGENTA

 ------------------------
|  left   | green JPanel |
| JPanel  |______________|
|  with   |magenta Jpanel|
|3 JPanel |              |
|________________________|

现在左侧JPanelREDBLACKBLUE JPanel放在其自身上,GridBagLayout为其Layout Manager } RED and BLUE weighty = 0.1BLACK weighty = 0.8

请参阅此示例代码:

import java.awt.*;
import javax.swing.*;

public class GridBagExample {
    private JPanel leftPanel;
    private JPanel redPanel;
    private JPanel blackPanel;
    private JPanel bluePanel;
    private JPanel greenPanel;
    private JPanel magentaPanel;

    private GridBagConstraints gbc;

    public GridBagExample() {
        gbc = new GridBagConstraints();
        gbc.anchor = GridBagConstraints.FIRST_LINE_START;
    }

    private void displayGUI() {
        JFrame frame = new JFrame("GridBagLayout Example");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        JPanel contentPane = new JPanel(new GridBagLayout());

        leftPanel = getPanel(Color.WHITE);
        leftPanel.setLayout(new GridBagLayout());
        redPanel = getPanel(Color.RED.darker());
        blackPanel = getPanel(Color.BLACK);
        bluePanel = getPanel(Color.CYAN.darker().darker());
        greenPanel = getPanel(Color.GREEN.darker().darker());
        magentaPanel = getPanel(Color.MAGENTA);
        /**
          * @param : 
          * leftPanel : JPanel (with GridBagLayout), on which
          *               all other components will be placed.
          * redPanel : JPanel, which will be added to the leftPanel
          * 0 : specifies the grid X, which in this case is 0
          * 0 : specifies the grid Y, which in this case is 0
          * 1 : specifies the width for this grid (cell), we keeping 
          *     this default as 1
          * 1 : specifies the height for this grid (cell), we keeping
          *     this default as 1
          * GridBagConstraints.BOTH : allows JPanel to expand in both
          *     directions as the containing container expands (in 
          *     this case redPanel will expand both HORIZONTALLY and
          *     VERTICALLY, as leftPanel will expand)
          * weightx : This is the actual width the redPanel will occupy
          *           relative to all other components on the leftPanel
          * weighty : This is the actual height the redPanel will occupy
          *           relative to all other components on the leftPanel
          */
        addComp(leftPanel, redPanel, 0, 0, 1, 1,
                        GridBagConstraints.BOTH, 1.0, 0.1);
        addComp(leftPanel, blackPanel, 0, 1, 1, 1,
                        GridBagConstraints.BOTH, 1.0, 0.8);
        addComp(leftPanel, bluePanel, 0, 2, 1, 1,
                        GridBagConstraints.BOTH, 1.0, 0.1);
        addComp(contentPane, leftPanel, 0, 0, 1, 2,
                        GridBagConstraints.BOTH, 0.5, 1.0);
        addComp(contentPane, greenPanel, 1, 0, 1, 1,
                        GridBagConstraints.BOTH, 0.5, 0.3);
        addComp(contentPane, magentaPanel, 1, 1, 1, 1,
                        GridBagConstraints.BOTH, 0.5, 0.7);

        frame.setContentPane(contentPane);
        /*
         * Once you will add components to these
         * JPanels, then use pack(), instead of
         * setSize(). The use of the latter is 
         * just for illustration purpose only
         */
        //frame.pack();
        frame.setSize(300, 300);
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private void addComp(JPanel panel, JComponent comp,
                            int x, int y, int width, int height,
                            int fill, double weightx, double weighty) {
        gbc.gridx = x;
        gbc.gridy = y;
        gbc.gridwidth = width;
        gbc.gridheight = height;
        gbc.fill = fill;
        gbc.weightx = weightx;
        gbc.weighty = weighty;

        panel.add(comp, gbc);
    }

    private JPanel getPanel(Color backColor) {
        JPanel panel = new JPanel();
        panel.setOpaque(true);
        panel.setBackground(backColor);

        return panel;
    }

    public static void main(String[] args) {
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                new GridBagExample().displayGUI();
            }
        };
        EventQueue.invokeLater(runnable);
    }
}

以下是相同的输出:

GRIDBAGLAYOUTIMAGE