Java 突出显示JTable的列标题
我目前正在构建一个小JTable,并希望在选择单元格时突出显示列标题(以及行标题-行标题部分实际上正在工作),以便更容易地找到与此单元格关联的名称。这是一张照片: 我已经尝试使用以下命令关闭标题的渲染器:Java 突出显示JTable的列标题,java,swing,jtable,highlight,jtableheader,Java,Swing,Jtable,Highlight,Jtableheader,我目前正在构建一个小JTable,并希望在选择单元格时突出显示列标题(以及行标题-行标题部分实际上正在工作),以便更容易地找到与此单元格关联的名称。这是一张照片: 我已经尝试使用以下命令关闭标题的渲染器: table.getTableHeader().setDefaultRenderer(new ColumnHeaderRenderer()); 但只有当我点击标题并总是说isSelected为false时,才会调用它 这是我用于行名称的代码,包括渲染器内的高亮显示-代码不是我写的,我只是对其
table.getTableHeader().setDefaultRenderer(new ColumnHeaderRenderer());
但只有当我点击标题并总是说isSelected为false时,才会调用它
这是我用于行名称的代码,包括渲染器内的高亮显示-代码不是我写的,我只是对其进行了一些修改:
/*
* Use a JTable as a renderer for row numbers of a given main table.
* This table must be added to the row header of the scrollpane that
* contains the main table.
*/
public class RowNameTable extends JTable
implements ChangeListener, PropertyChangeListener {
private JTable main;
public RowNameTable(JTable table) {
main = table;
main.addPropertyChangeListener(this);
setFocusable(false);
setAutoCreateColumnsFromModel(false);
setModel(main.getModel());
setSelectionModel(main.getSelectionModel());
TableColumn column = new TableColumn();
column.setHeaderValue(" ");
addColumn(column);
column.setCellRenderer(new RowNameRenderer(main));
getColumnModel().getColumn(0).setPreferredWidth(table.getColumnModel().getColumn(0).getPreferredWidth());
setPreferredScrollableViewportSize(getPreferredSize());
}
@Override
public void addNotify() {
super.addNotify();
Component c = getParent();
// Keep scrolling of the row table in sync with the main table.
if (c instanceof JViewport) {
JViewport viewport = (JViewport) c;
viewport.addChangeListener(this);
}
}
/*
* Delegate method to main table
*/
@Override
public int getRowCount() {
return main.getRowCount();
}
@Override
public int getRowHeight(int row) {
return main.getRowHeight(row);
}
/*
* This table does not use any data from the main TableModel,
* so just return a value based on the row parameter.
*/
@Override
public Object getValueAt(int row, int column) {
return Integer.toString(row + 1);
}
/*
* Don't edit data in the main TableModel by mistake
*/
@Override
public boolean isCellEditable(int row, int column) {
return false;
}
//
// Implement the ChangeListener
//
public void stateChanged(ChangeEvent e) {
// Keep the scrolling of the row table in sync with main table
JViewport viewport = (JViewport) e.getSource();
JScrollPane scrollPane = (JScrollPane) viewport.getParent();
scrollPane.getVerticalScrollBar().setValue(viewport.getViewPosition().y);
}
//
// Implement the PropertyChangeListener
//
public void propertyChange(PropertyChangeEvent e) {
// Keep the row table in sync with the main table
if ("selectionModel".equals(e.getPropertyName())) {
setSelectionModel(main.getSelectionModel());
}
if ("model".equals(e.getPropertyName())) {
setModel(main.getModel());
}
}
/*
* Borrow the renderer from JDK1.4.2 table header
*/
private static class RowNameRenderer extends DefaultTableCellRenderer {
private JTable main;
public RowNameRenderer(JTable main) {
this.main = main;
setHorizontalAlignment(JLabel.CENTER);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (table != null) {
JTableHeader header = table.getTableHeader();
if (header != null) {
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
}
}
if (isSelected) {
setFont(getFont().deriveFont(Font.BOLD));
}
setText((value == null) ? "" : main.getColumnName(row));
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return this;
}
}
}
这里我们有相关的部分来创建表:
costTableModel = new CostTableModel(costCalc);
table = new JTable(costTableModel);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.setCellSelectionEnabled(true);
scrollPane = new JScrollPane(table);
RowNameTable nameTable = new RowNameTable(table);
scrollPane.setRowHeaderView(nameTable);
以及类costTableModel,只是为了完整性:
public class CostTableModel extends AbstractTableModel {
private CostCalculator costCalc;
public CostTableModel(CostCalculator costCalc) {
this.costCalc = costCalc;
}
@Override
public int getRowCount() {
return costCalc.getPersonsList().size();
}
@Override
public int getColumnCount() {
return costCalc.getPersonsList().size();
}
@Override
public String getColumnName(int col) {
return costCalc.getPersonsList().get(col).getName();
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Person debtor = costCalc.getPersonsList().get(rowIndex);
Person debtee = costCalc.getPersonsList().get(columnIndex);
return costCalc.getAmountOwed(debtor, debtee);
}
@Override
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
}
提前感谢您的帮助 我遇到的基本问题是,表格标题和选择更改之间没有联系。事实上,标题的重新绘制非常巧妙 我最终提供了自己的标题,它将侦听器附加到表的选择模型,并在更改的选择上重新绘制标题
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.util.List;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.RowSorter;
import javax.swing.RowSorter.SortKey;
import static javax.swing.SortOrder.ASCENDING;
import static javax.swing.SortOrder.DESCENDING;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
public class TestColumnHighlight {
public static void main(String[] args) {
new TestColumnHighlight();
}
public TestColumnHighlight() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JTable table = new JTable();
DefaultTableModel model = new DefaultTableModel(
new Object[]{"abc", "def", "ghi", "jkl"},
0);
model.addRow(new Object[]{0, 0, 0, 0});
model.addRow(new Object[]{0, 0, 0, 0});
model.addRow(new Object[]{0, 0, 0, 0});
model.addRow(new Object[]{0, 0, 0, 0});
model.addRow(new Object[]{0, 0, 0, 0});
table.setModel(model);
table.setTableHeader(new CustomTableHeader(table));
table.getTableHeader().setDefaultRenderer(new ColumnHeaderRenderer());
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class CustomTableHeader extends JTableHeader {
public CustomTableHeader(JTable table) {
super();
setColumnModel(table.getColumnModel());
table.getColumnModel().getSelectionModel().addListSelectionListener(new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent e) {
repaint();
}
});
}
@Override
public void columnSelectionChanged(ListSelectionEvent e) {
repaint();
}
}
public class ColumnHeaderRenderer extends DefaultTableHeaderCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean selected, boolean focused, int row, int column) {
super.getTableCellRendererComponent(table, value, selected, focused, row, column);
int selectedColumn = table.getSelectedColumn();
System.out.println("Selected " + selectedColumn + "-" + column);
if (selectedColumn == column) {
Color bg = table.getSelectionBackground();
setBackground(bg);
setOpaque(true);
} else {
setOpaque(false);
}
return this;
}
}
public class DefaultTableHeaderCellRenderer extends DefaultTableCellRenderer {
public DefaultTableHeaderCellRenderer() {
setHorizontalAlignment(CENTER);
setHorizontalTextPosition(LEFT);
setVerticalAlignment(BOTTOM);
setOpaque(false);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
JTableHeader tableHeader = table.getTableHeader();
if (tableHeader != null) {
setForeground(tableHeader.getForeground());
}
setIcon(getIcon(table, column));
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return this;
}
protected Icon getIcon(JTable table, int column) {
SortKey sortKey = getSortKey(table, column);
if (sortKey != null && table.convertColumnIndexToView(sortKey.getColumn()) == column) {
switch (sortKey.getSortOrder()) {
case ASCENDING:
return UIManager.getIcon("Table.ascendingSortIcon");
case DESCENDING:
return UIManager.getIcon("Table.descendingSortIcon");
}
}
return null;
}
protected SortKey getSortKey(JTable table, int column) {
RowSorter rowSorter = table.getRowSorter();
if (rowSorter == null) {
return null;
}
List sortedColumns = rowSorter.getSortKeys();
if (sortedColumns.size() > 0) {
return (SortKey) sortedColumns.get(0);
}
return null;
}
}
}
一个轻微的变化:当我阅读问题时,主要问题是列选择更改时标题没有更新。让自定义标题侦听行选择更改对该场景没有多大帮助 事实上,JTableHeader已经在侦听ColumnModel,并且模型的更改通知包括选择更改。只有columnSelectionChange方法故意实现为不执行任何操作:
// --Redrawing the header is slow in cell selection mode.
// --Since header selection is ugly and it is always clear from the
// --view which columns are selected, don't redraw the header.
自定义头可以简单地实现重新绘制(这里lazy me在表的工厂方法中执行此操作,只是为了省去与表的连接,您可以很容易地使其成为一个独立类:-)
还使用表api稍微调整了Mad的渲染器:
/**
* Slightly adjusted compared to @Mad
* - use table's selectionBackground
* - use table's isColumnSelected to decide on highlight
*/
public static class ColumnHeaderRenderer extends DefaultTableCellHeaderRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean selected,
boolean focused, int row, int column) {
super.getTableCellRendererComponent(table, value, selected, focused, row, column);
if (table.isColumnSelected(column)) {
setBackground(table.getSelectionBackground());
}
return this;
}
}
关于意见:
总是说我选的是假的
原因是BasicTableHeaderUI中有一个小小的怪癖:
ui.selected != columnModel.selected
uiSelected是keybindings可以访问的列-如果laf支持它并且标题是focusOwner。这对我来说没有什么意义,但是完全定义ui和columnModel选择的语义让我对新的babe fx感到兴奋,这一点被遗忘了;-) 首先,谢谢!这看起来很像我所需要的,我目前没有时间在我的代码中实现它,但我今晚会做这件事,并在这里报告。好的,我现在就构建它!它工作得很好,除了一件小事(标记几个列标题),但我将试着弄清楚这一点,并进一步了解JTables:)嗯。。。不了解聆听行选择如何帮助重新绘制列选择更改。事实上,它不是:选择一个单元格,然后将所选内容移动到同一行,列的突出显示不会更新。顺便说一句:仅为注册侦听器而进行子类化并不是进行子类化的充分理由-可以在没有:-)的情况下完成@kleopatra同意,我想我尝试了一些其他的头,只是没有清理代码。坏女人一号,有用。但是我不明白为什么DefaultTableCellHeaderRenderer只在import sun.swing.table上,而不在javax.swing.table上。您是如何访问DefaultTableCellHeaderRenderer的?
ui.selected != columnModel.selected