如何在JPanel中添加带有null布局的JTable？ [英] How to add JTable in JPanel with null layout?

问题描述

我想将 JTable 添加到 JPanel ，其布局为 null 。 JPanel 包含其他组件。我必须在适当的位置添加 JTable 。

I want to add JTable into JPanel whose layout is null. JPanel contains other components. I have to add JTable at proper position.

推荐答案

嵌套/组合布局示例

Java Tutorial提供了有关使用布局管理器的全面信息。有关详细信息，请参阅在容器中布置组件课程。

教程中不覆盖的布局的一个方面是嵌套布局，将一个布局放在另一个布局中以获得复杂的效果。

One aspect of layouts that is not covered well by the tutorial is that of nested layouts, putting one layout inside another to get complex effects.

以下代码将各种组件放入框架中，以演示如何使用嵌套布局。显式设置的所有布局都显示为使用它们的面板的标题边框。

The following code puts a variety of components into a frame to demonstrate how to use nested layouts. All the layouts that are explicitly set are shown as a titled-border for the panel on which they are used.

代码的显着方面是：

• 有一个组合框可以在运行时更改PLAF（可插入的外观和感觉）。


• GUI可以根据用户的需要进行扩展。


• 拆分窗格底部的图像位于滚动窗格的中心。


• 标签实例左侧是使用按钮动态添加的。

• There is a combo-box to change PLAF (Pluggable Look and Feel) at run-time.
• The GUI is expandable to the user's need.
• The image in the bottom of the split-pane is centered in the scroll-pane.
• The label instances on the left are dynamically added using the button.

import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.border.TitledBorder;

/** A short example of a nested layout that can change PLAF at runtime.
The TitledBorder of each JPanel shows the layouts explicitly set.
@author Andrew Thompson
@version 2011-04-12 */
class NestedLayoutExample {

    public static void main(String[] args) {

        Runnable r = new Runnable() {

            public void run() {
                final JFrame frame = new JFrame("Nested Layout Example");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                final JPanel gui = new JPanel(new BorderLayout(5,5));
                gui.setBorder( new TitledBorder("BorderLayout(5,5)") );

                //JToolBar tb = new JToolBar();
                JPanel plafComponents = new JPanel(
                    new FlowLayout(FlowLayout.RIGHT, 3,3));
                plafComponents.setBorder(
                    new TitledBorder("FlowLayout(FlowLayout.RIGHT, 3,3)") );

                final UIManager.LookAndFeelInfo[] plafInfos =
                    UIManager.getInstalledLookAndFeels();
                String[] plafNames = new String[plafInfos.length];
                for (int ii=0; ii<plafInfos.length; ii++) {
                    plafNames[ii] = plafInfos[ii].getName();
                }
                final JComboBox plafChooser = new JComboBox(plafNames);
                plafComponents.add(plafChooser);

                final JCheckBox pack = new JCheckBox("Pack on PLAF change", true);
                plafComponents.add(pack);

                plafChooser.addActionListener( new ActionListener(){
                    public void actionPerformed(ActionEvent ae) {
                        int index = plafChooser.getSelectedIndex();
                        try {
                            UIManager.setLookAndFeel(
                                plafInfos[index].getClassName() );
                            SwingUtilities.updateComponentTreeUI(frame);
                            if (pack.isSelected()) {
                                frame.pack();
                                frame.setMinimumSize(frame.getSize());
                            }
                        } catch(Exception e) {
                            e.printStackTrace();
                        }
                    }
                } );

                gui.add(plafComponents, BorderLayout.NORTH);

                JPanel dynamicLabels = new JPanel(new BorderLayout(4,4));
                dynamicLabels.setBorder(
                    new TitledBorder("BorderLayout(4,4)") );
                gui.add(dynamicLabels, BorderLayout.WEST);

                final JPanel labels = new JPanel(new GridLayout(0,2,3,3));
                labels.setBorder(
                    new TitledBorder("GridLayout(0,2,3,3)") );

                JButton addNew = new JButton("Add Another Label");
                dynamicLabels.add( addNew, BorderLayout.NORTH );
                addNew.addActionListener( new ActionListener(){

                    private int labelCount = 0;

                    public void actionPerformed(ActionEvent ae) {
                        labels.add( new JLabel("Label " + ++labelCount) );
                        frame.validate();
                    }
                } );

                dynamicLabels.add( new JScrollPane(labels), BorderLayout.CENTER );

                String[] header = {"Name", "Value"};
                String[] a = new String[0];
                String[] names = System.getProperties().
                    stringPropertyNames().toArray(a);
                String[][] data = new String[names.length][2];
                for (int ii=0; ii<names.length; ii++) {
                    data[ii][0] = names[ii];
                    data[ii][1] = System.getProperty(names[ii]);
                }
                DefaultTableModel model = new DefaultTableModel(data, header);
                JTable table = new JTable(model);
                try {
                    // 1.6+
                    table.setAutoCreateRowSorter(true);
                } catch(Exception continuewithNoSort) {
                }
                JScrollPane tableScroll = new JScrollPane(table);
                Dimension tablePreferred = tableScroll.getPreferredSize();
                tableScroll.setPreferredSize(
                    new Dimension(tablePreferred.width, tablePreferred.height/3) );

                JPanel imagePanel = new JPanel(new GridBagLayout());
                imagePanel.setBorder(
                    new TitledBorder("GridBagLayout()") );

                BufferedImage bi = new BufferedImage(
                    200,200,BufferedImage.TYPE_INT_ARGB);
                Graphics2D g = bi.createGraphics();
                GradientPaint gp = new GradientPaint(
                    20f,20f,Color.red, 180f,180f,Color.yellow);
                g.setPaint(gp);
                g.fillRect(0,0,200,200);
                ImageIcon ii = new ImageIcon(bi);
                JLabel imageLabel = new JLabel(ii);
                imagePanel.add( imageLabel, null );

                JSplitPane splitPane = new JSplitPane(
                    JSplitPane.VERTICAL_SPLIT,
                    tableScroll,
                    new JScrollPane(imagePanel));
                gui.add( splitPane, BorderLayout.CENTER );

                frame.setContentPane(gui);

                frame.pack();

                frame.setLocationRelativeTo(null);
                try {
                    // 1.6+
                    frame.setLocationByPlatform(true);
                    frame.setMinimumSize(frame.getSize());
                } catch(Throwable ignoreAndContinue) {
                }

                frame.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

其他屏幕截图

Windows PLAF

Other Screen Shots

Windows PLAF

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