Java 在JTable列标题左侧显示附加图标（Nimbus）
我希望我的JTable的列标题在其左侧得到一个额外的图标，当它们的值是表的行过滤器的基础时。排序图标显示在右侧，因此将两个图标“粘合”成一个并不重要（尽管我也无法使其在Nimbus中正常工作…）。我尝试了一些渲染器的想法，但我做不到。。。“方法”的描述以及它们的错误都包含在发布的代码中 编辑：忘记了一个简单的设置图标-在这种情况下，问题在于排序图标。使排序图标可见会隐藏另一个图标 编辑：这给出了如何解决以下第三次尝试（使用模型背景图像的尝试）中的问题的想法。但我不知道如何知道鼠标悬停、聚焦等的价值。。。如何将它们作为布尔值获取？（我的意思是鼠标悬停状态为true/false，聚焦状态为tru/false等，这样我就可以准备模型图像的查找表，并获得列标题当前状态的正确图像） 编辑：要查看这三种情况的输出，必须修改行Java 在JTable列标题左侧显示附加图标（Nimbus）,java,swing,icons,tablecellrenderer,jtableheader,Java,Swing,Icons,Tablecellrenderer,Jtableheader,我希望我的JTable的列标题在其左侧得到一个额外的图标，当它们的值是表的行过滤器的基础时。排序图标显示在右侧，因此将两个图标“粘合”成一个并不重要（尽管我也无法使其在Nimbus中正常工作…）。我尝试了一些渲染器的想法，但我做不到。。。“方法”的描述以及它们的错误都包含在发布的代码中 编辑：忘记了一个简单的设置图标-在这种情况下，问题在于排序图标。使排序图标可见会隐藏另一个图标 编辑：这给出了如何解决以下第三次尝试（使用模型背景图像的尝试）中的问题的想法。但我不知道如何知道鼠标悬停、聚焦等的价
table.getTableHeader（）.setDefaultRenderer（新的FiltericonHeaderRender3（table））
导入java.awt.BorderLayout；
导入java.awt.Color；
导入java.awt.Component；
导入java.awt.Container；
导入java.awt.Dimension；
导入java.awt.EventQueue；
导入java.awt.Graphics；
导入java.awt.Graphics2D；
导入java.awt.Rectangle；
导入java.awt.image.buffereImage；
导入javax.swing.ImageIcon；
导入javax.swing.JComponent；
导入javax.swing.JFrame；
导入javax.swing.JLabel；
导入javax.swing.JPanel；
导入javax.swing.JScrollPane；
导入javax.swing.JTable；
导入javax.swing.UIManager；
导入javax.swing.UnsupportedLookAndFeelException；
导入javax.swing.table.DefaultTableModel；
导入javax.swing.table.TableCellRenderer；
导入javax.swing.table.TableRowSorter；
公共类TableHeaderTest扩展了JFrame{
JTable table=新的JTable（新的DefaultTableModel（新对象[]{“Column1”、“Column2”、“Column3”}，3））；
TableHeaderTest（）{
TableRowSorter-sorter=新的TableRowSorter（table.getModel（））；
表.SetRow分拣机（分拣机）；
table.getTableHeader（）.setDefaultRenderer（新的FilterIconHeaderRenderer3（表））；
setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）；
JScrollPane scrollPane=新的JScrollPane（）；
scrollPane.setViewportView（表）；
添加（滚动窗格，BorderLayout.CENTER）；
包装（）；
setVisible（真）；
}
公共静态void main（字符串[]args）{
试一试{
UIManager.setLookAndFeel（“com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel”）；
}catch（不支持ookandfeelexception | ClassNotFoundException | IllegalAccessException |实例化exception ex）{
System.out.println（“[L&F][Exception]”和ex.getMessage（）；
}
EventQueue.invokeLater（（）->{
新的TableHeaderTest（）；
});
}
}
/**
*尝试复制TableHeader的外观并覆盖其组件
*用于绘制附加图标的方法。然而，外观不可能完全相同
*复制，例如排序图标和背景的行为不同。
*列名的缩进也消失了。
*/
类FiltericonHeaderRender1实现TableCellRenderer{
表1：代表；
ImageIcon filterIcon=新的ImageIcon（getClass（）.getResource（“/res/marker dot green.png”）；
公共过滤器HeaderRender1（JTable表）{
this.delegate=table.getTableHeader（）.getDefaultRenderer（）；
}
@凌驾
公共组件GetTableCellRenderComponent（JTable表、对象值、布尔isSelected、布尔hasFocus、int行、int列）{
Component c=delegate.GetTableCellRenderComponent（表、值、isSelected、hasFocus、行、列）；
if（JLabel的c实例）{
JLabelCopy标签=新的JLabelCopy（（JLabel）c）；
退货标签；
}
返回c；
}
类JLabelCopy扩展了JLabel{
带图标的布尔值=true；
JLabelCopy（JLabel标签）{
this.ui=label.getUI（）；
this.setText（label.getText（））；
this.setPreferredSize（label.getPreferredSize（））；
这个.setVerticalTextPosition（label.getVerticalTextPosition（））；
这个.setHorizontalTextPosition（label.getHorizontalTextPosition（））；
this.setVerticalAlignment（label.getVerticalAlignment（））；
这个.setHorizontalAlignment（label.getHorizontalAlignment（））；
this.setIcon（label.getIcon（））；
这个.setIconTextGap（label.getIconTextGap（））；
这个.setAlignmentX（label.getAlignmentX（））；
这个.setAlignmentY（label.getAlignmentY（））；
这个.setLayout（label.getLayout（））；
}
@凌驾
公共组件（图形g）{
超级组件（g）；
如果（带图标）{
g、 drawImage（filterIcon.getImage（），4，4，null）；
}
}
}
}
/**
*还尝试复制TableHeader的外观，但不覆盖其外观
*绘制组件方法。取而代之的是，我把标题做成一个由两个组成的面板
*jlabel—原始列标题和复制外观的jlabel，其中添加了
*图标。这种方法的问题是可见分隔符的分隔符
*列排序时的两个标签和颜色差异（
*复制的外观标签不会更改其背景以匹配已排序的标题）。
*
*/
类FiltericonHeaderRender2实现TableCellRenderer{
表1：代表；
ImageIcon filterIcon=新的ImageIcon（getClass（）.getResource（“/res/marker dot green.png”）；
公共过滤器HeaderRender2（JTable表）{
this.delegate=table.getTableHeader（）.getDefaultRenderer（）；
}
@凌驾
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableRowSorter;
public class TableHeaderTest extends JFrame {
JTable table = new JTable(new DefaultTableModel(new Object[]{"Column1", "Column2", "Column3"}, 3));
TableHeaderTest() {
TableRowSorter sorter = new TableRowSorter(table.getModel());
table.setRowSorter(sorter);
table.getTableHeader().setDefaultRenderer(new FilterIconHeaderRenderer3(table));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportView(table);
add(scrollPane, BorderLayout.CENTER);
pack();
setVisible(true);
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (UnsupportedLookAndFeelException | ClassNotFoundException | IllegalAccessException | InstantiationException ex) {
System.out.println("[L&F][Exception] " + ex.getMessage());
}
EventQueue.invokeLater(() -> {
new TableHeaderTest();
});
}
}
/**
* Trying to copy the look of a TableHeader and override its paintComponent
* method for drawing the additional icon. However the look can't be entirely
* copied and for example the sorting icon and background behave differently.
* Also the indent of column name dissapeared.
*/
class FilterIconHeaderRenderer1 implements TableCellRenderer {
TableCellRenderer delegate;
ImageIcon filterIcon = new ImageIcon(getClass().getResource("/res/marker-dot-green.png"));
public FilterIconHeaderRenderer1(JTable table) {
this.delegate = table.getTableHeader().getDefaultRenderer();
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Component c = delegate.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (c instanceof JLabel) {
JLabelCopy label = new JLabelCopy((JLabel) c);
return label;
}
return c;
}
class JLabelCopy extends JLabel {
boolean withIcon = true;
JLabelCopy(JLabel label) {
this.ui = label.getUI();
this.setText(label.getText());
this.setPreferredSize(label.getPreferredSize());
this.setVerticalTextPosition(label.getVerticalTextPosition());
this.setHorizontalTextPosition(label.getHorizontalTextPosition());
this.setVerticalAlignment(label.getVerticalAlignment());
this.setHorizontalAlignment(label.getHorizontalAlignment());
this.setIcon(label.getIcon());
this.setIconTextGap(label.getIconTextGap());
this.setAlignmentX(label.getAlignmentX());
this.setAlignmentY(label.getAlignmentY());
this.setLayout(label.getLayout());
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (withIcon) {
g.drawImage(filterIcon.getImage(), 4, 4, null);
}
}
}
}
/**
* Also trying to copy the look of a TableHeader but without overriding its
* paintComponent method. Instead I make the header a panel consiting of two
* jLabels - the original column header and a jlabel of copied look with added
* icon. Problem with this method is theseparator of the visible separator of
* the two labels and the color difference of when a column is sorted (the
* copied-look-label doesn't change it's background to match a sorted header).
*
*/
class FilterIconHeaderRenderer2 implements TableCellRenderer {
TableCellRenderer delegate;
ImageIcon filterIcon = new ImageIcon(getClass().getResource("/res/marker-dot-green.png"));
public FilterIconHeaderRenderer2(JTable table) {
this.delegate = table.getTableHeader().getDefaultRenderer();
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
JPanel newHeader = new JPanel(new BorderLayout());
Component c = delegate.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (c instanceof JLabel) {
JLabel label = (JLabel) c;
JLabelCopy filterIconLabel = new JLabelCopy(label);
filterIconLabel.setText("");
filterIconLabel.setIcon(filterIcon);
filterIconLabel.setPreferredSize(new Dimension(filterIcon.getIconWidth() + 4, filterIconLabel.getPreferredSize().height));
newHeader.add(filterIconLabel, BorderLayout.WEST);
newHeader.add(label, BorderLayout.CENTER);
return newHeader;
}
return c;
}
class JLabelCopy extends JLabel {
boolean withIcon = true;
JLabelCopy(JLabel label) {
this.ui = label.getUI();
this.setPreferredSize(label.getPreferredSize());
this.setVerticalTextPosition(label.getVerticalTextPosition());
this.setHorizontalTextPosition(label.getHorizontalTextPosition());
this.setVerticalAlignment(label.getVerticalAlignment());
this.setHorizontalAlignment(label.getHorizontalAlignment());
this.setIcon(label.getIcon());
this.setIconTextGap(label.getIconTextGap());
this.setAlignmentX(label.getAlignmentX());
this.setAlignmentY(label.getAlignmentY());
this.setLayout(label.getLayout());
}
}
}
/**
* Having an array of header mockups for each state for selected and hasFocus
* (lacks sorted state) of the column header. Using these as background of panel
* loaded with two labels - original header and label with just the new icon.
* Both have setOpaque(false). Problem with this is the problem with choosing
* the right background image for the panel as the isSelected and hasFocus
* parameters of getRendererComponent don't work as you think they should.
*/
class FilterIconHeaderRenderer3 implements TableCellRenderer {
private BufferedImage[][] headerImages = new BufferedImage[2][2];
TableCellRenderer delegate;
ImageIcon filterIcon = new ImageIcon(getClass().getResource("/res/marker-dot-green.png"));
public FilterIconHeaderRenderer3(JTable table) {
this.delegate = table.getTableHeader().getDefaultRenderer();
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
JLabel comp = (JLabel) delegate.getTableCellRendererComponent(table, " ", i == 1, j == 1, 0, 0);
headerImages[i][j] = createUMPFake(comp);
}
}
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Component c = delegate.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (c instanceof JLabel) {
JPanel newHeader = new JPanel(new BorderLayout()) {
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(headerImages[isSelected ? 1 : 0][hasFocus ? 1 : 0], 0, 0, null);
}
};
JLabel label = (JLabel) c;
label.setOpaque(false);
JLabel filterIconLabel = new JLabel();
filterIconLabel.setText("");
filterIconLabel.setOpaque(false);
filterIconLabel.setIcon(filterIcon);
filterIconLabel.setPreferredSize(new Dimension(filterIcon.getIconWidth() + 4, filterIconLabel.getPreferredSize().height));
newHeader.add(filterIconLabel, BorderLayout.WEST);
newHeader.add(label, BorderLayout.CENTER);
return newHeader;
}
return c;
}
/*
* Following methods were taken from:
* https://stackoverflow.com/questions/4028898/create-an-image-from-a-non-visible-awt-component
*/
private BufferedImage createUMPFake(Component comp) {
JFrame invisibleFrame = new JFrame();
invisibleFrame.setSize(comp.getPreferredSize());
JPanel colorPanel = new JPanel();
colorPanel.setOpaque(false);
colorPanel.setLayout(new BorderLayout());
colorPanel.setBackground(new Color(0, 0, 255, 0));
colorPanel.setSize(invisibleFrame.getSize());
colorPanel.add(comp, BorderLayout.CENTER);
invisibleFrame.add(colorPanel);
colorPanel.setVisible(true);
return createImage((JComponent) colorPanel, new Rectangle(invisibleFrame.getBounds()));
}
/**
* Create a BufferedImage for Swing components. All or part of the component
* can be captured to an image.
*
* @param component component to create image from
* @param region The region of the component to be captured to an image
* @return image the image for the given region
*/
private static BufferedImage createImage(Component component, Rectangle region) {
// Make sure the component has a size and has been layed out.
// (necessary check for components not added to a realized frame)
if (!component.isDisplayable()) {
Dimension d = component.getSize();
if (d.width == 0 || d.height == 0) {
d = component.getPreferredSize();
component.setSize(d);
}
layoutComponent(component);
}
BufferedImage image = new BufferedImage(region.width, region.height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = image.createGraphics();
// Paint a background for non-opaque components,
// otherwise the background will be black
if (!component.isOpaque()) {
g2d.setColor(component.getBackground());
g2d.fillRect(region.x, region.y, region.width, region.height);
}
g2d.translate(-region.x, -region.y);
component.paint(g2d);
g2d.dispose();
return image;
}
private static void layoutComponent(Component component) {
synchronized (component.getTreeLock()) {
component.doLayout();
if (component instanceof Container) {
for (Component child : ((Container) component).getComponents()) {
layoutComponent(child);
}
}
}
}
}
import java.awt.*;
import java.awt.event.*;
import java.net.URL;
import java.util.Objects;
import javax.swing.*;
import javax.swing.table.*;
public class TableHeaderIconTest {
//private final URL url = getClass().getResource("a.png");
public JComponent makeUI() {
String[] columnNames = {"Column1", "Column2", "Column3"};
JTable table = new JTable(new DefaultTableModel(columnNames, 3));
TableColumnModel m = table.getColumnModel();
for (int i = 0; i < m.getColumnCount(); i++) {
TableColumn column = m.getColumn(i);
column.setHeaderRenderer(new FilterIconHeaderRenderer4());
//column.setHeaderValue(
// String.format("<html><table><td><img src='%s'/><td>%s", url, columnNames[i]));
}
table.setAutoCreateRowSorter(true);
JPanel p = new JPanel(new BorderLayout());
p.add(new JScrollPane(table));
return p;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
try {
for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(laf.getName())) {
UIManager.setLookAndFeel(laf.getClassName());
}
}
} catch (Exception e) {
e.printStackTrace();
}
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new TableHeaderIconTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class FilterIconHeaderRenderer4 implements TableCellRenderer {
private final URL url = getClass().getResource("Ok2mc.png");
@Override public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
TableCellRenderer r = table.getTableHeader().getDefaultRenderer();
String str = Objects.toString(value, "");
String html = String.format("<html><table><td><img src='%s'/><td>%s", url, str);
return r.getTableCellRendererComponent(table, html, isSelected, hasFocus, row, column);
}
}