Question

当用户更改图像列的列宽时，如何让JTable自动调整绑定的ImageIcons的大小？

Answer 1

“当用户更改图像列的列宽时，如何让JTable自动调整绑定的ImageIcons？”

这是一个用于拉伸图像的辅助类它只是一个绘制Image的扩展JPanel。您需要将Image传递给它

它的基本功能是将图像绘制到面板的宽度和高度。因此，稍后在渲染器中使用它时，它会在显示区域拉伸时自动调整大小

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

public class ImageViewer extends JPanel {

    private java.awt.Image image;
    private int xCoordinate;
    private boolean stretched = true;
    private int yCoordinate;

    public ImageViewer() {
    }

    public ImageViewer(Image image) {
        this.image = image;
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        if (image != null) {
            if (isStretched()) {
                g.drawImage(image, xCoordinate, yCoordinate,
                        getSize().width, getSize().height, this);
            } else {
                g.drawImage(image, xCoordinate, yCoordinate, this);
            }
        }
    }

    public java.awt.Image getImage() {
        return image;
    }

    public void setImage(java.awt.Image image) {
        this.image = image;
        repaint();
    }

    public boolean isStretched() {
        return stretched;
    }

    public void setStretched(boolean stretched) {
        this.stretched = stretched;
        repaint();
    }

    public int getXCoordinate() {
        return xCoordinate;
    }

    public void setXCoordinate(int xCoordinate) {
        this.xCoordinate = xCoordinate;
        repaint();
    }

    public int getYCoordinate() {
        return yCoordinate;
    }

    public void setYCoordinate(int yCoordinate) {
        this.yCoordinate = yCoordinate;
        repaint();
    }
}

我还使用了这个自定义单元格渲染器，我使用ImageViewer类

import bookclasses.ImageViewer;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;

public class MyImageCellRenderer extends DefaultTableCellRenderer {

    public Component getTableCellRendererComponent(JTable table, Object value,
            boolean isSelected, boolean isFocused, int row, int column) {
        Image image = ((ImageIcon) value).getImage();
        ImageViewer imageViewer = new ImageViewer(image);
        return imageViewer;
    }
}

这是一个示例程序，我使用渲染器类

import java.awt.BorderLayout;
import java.util.GregorianCalendar;
import javax.swing.ImageIcon;
import javax.swing.JApplet;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class TestTableCellRendererDemo extends JApplet {

    private String[] columnNames
            = {"Title", "Copies Needed", "Publisher", "Date Published",
                "In-stock", "Book Photo"};

    private ImageIcon intro1eImageIcon = new ImageIcon("icons/stacko/stackoverflow5.png");
    private ImageIcon intro2eImageIcon = new ImageIcon("icons/stacko/stackoverflow5.png");
    private ImageIcon intro3eImageIcon = new ImageIcon("icons/stacko/stackoverflow5.png");

    private Object[][] rowData = {
        {"Introduction to Java Programming", 120,
            "Que Education & Training",
            new GregorianCalendar(1998, 1 - 1, 6).getTime(),
            false, intro1eImageIcon},
        {"Introduction to Java Programming, 2E", 220,
            "Que Education & Training",
            new GregorianCalendar(1999, 1 - 1, 6).getTime(),
            false, intro2eImageIcon},
        {"Introduction to Java Programming, 3E", 220,
            "Prentice Hall",
            new GregorianCalendar(2000, 12 - 1, 0).getTime(),
            true, intro3eImageIcon},};

    private MyTableModel tableModel = new MyTableModel(
            rowData, columnNames);


    private JTable jTable1 = new JTable(tableModel);

    public TestTableCellRendererDemo() {
        jTable1.setDefaultRenderer(jTable1.getColumnClass(5), 
                new MyImageCellRenderer());
        jTable1.setRowHeight(60);
        add(new JScrollPane(jTable1), BorderLayout.CENTER);
    }
}

结果是带有图像的单元格，如果展开框架，图像将随之展开

enter image description here

所以，基本上

将我的自定义单元格渲染器设置为您想要的列

jTable1.setDefaultRenderer(jTable1.getColumnClass(5), 
        new MyImageCellRenderer());
jTable1.setRowHeight(60);

确保表格中的列为ImageIcon

private ImageIcon intro1eImageIcon = new ImageIcon("icons/stacko/stackoverflow5.png");
Object[] row = {
            "Introduction to Java Programming", 
            120,
            "Que Education & Training",
            new GregorianCalendar(1998, 1 - 1, 6).getTime(),
            false, 
            intro1eImageIcon
};

渲染器已调用ImageViewer，因此您无需在任何地方自行调用它。只需确保该文件与渲染器类

使用列宽动态调整JTable中的ImageIcon

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