在 JTable (Nimbus L & F) 中编辑数据时，当用户从一个单元格切换到另一个单元格时，哪个单元格具有焦点并不明显。我怎样才能更清楚哪个单元格有焦点？我知道可以设置许多属性来修改 Nimbus - 有人知道我想要哪个属性吗？
下面的屏幕截图只有一个属性设置为非默认值：
UIManager.put("Table.showGrid", true);
【问题讨论】：
标签： java swing jtable nimbus tablecelleditor
你看过Renderer concept，
默认为Nimbus Look and Feel工作，
JButtons components (JCheckBox e.i.) 可能有一些问题，但在这个论坛上已经回答或解决了几次
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.RowSorter.SortKey;
import javax.swing.SortOrder;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;
public class ImageChangeDemo extends JFrame {
private static final long serialVersionUID = 1L;
private JTable table = new javax.swing.JTable();
private JTable table1 = new javax.swing.JTable();
private static Icon ascendingSortIcon;
private static Icon descendingSortIcon;
public static void main(String args[]) {
//comment out the code below to try in Metal L&F
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
ascendingSortIcon = UIManager.getLookAndFeelDefaults().getIcon("Table.ascendingSortIcon");
descendingSortIcon = UIManager.getLookAndFeelDefaults().getIcon("Table.descendingSortIcon");
//UIManager.getLookAndFeelDefaults().put("Table.ascendingSortIcon", new BevelArrowIcon(BevelArrowIcon.UP, false, false));
//UIManager.getLookAndFeelDefaults().put("Table.descendingSortIcon", new BevelArrowIcon(BevelArrowIcon.DOWN, false, false));
break;
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new ImageChangeDemo().setVisible(true);
}
});
}
public ImageChangeDemo() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
JScrollPane pane = new javax.swing.JScrollPane();
//table.setAutoCreateRowSorter(true);
table.setModel(new javax.swing.table.DefaultTableModel(
new Object[][]{
{"a", "q", "h", "v"},
{"b", "m", "l", "h"},
{"d", "c", "a", "d"},
{"j", "o", "y", "e"}
},
new String[]{
"Col 1", "Col 2", "Col 3", "Col 4"
}) {
private static final long serialVersionUID = 1L;
Class[] types = new Class[]{
String.class, String.class, String.class, String.class
};
@Override
public Class getColumnClass(int columnIndex) {
return types[columnIndex];
}
});
TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(table.getModel()) {
@Override
public void toggleSortOrder(int column) {
if (column >= 0 && column < getModelWrapper().getColumnCount() && isSortable(column)) {
List<SortKey> keys = new ArrayList<SortKey>(getSortKeys());
if (!keys.isEmpty()) {
SortKey sortKey = keys.get(0);
if (sortKey.getColumn() == column && sortKey.getSortOrder() == SortOrder.DESCENDING) {
setSortKeys(null);
return;
}
}
}
super.toggleSortOrder(column);
}
};
table.setRowSorter(sorter);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
pane.setViewportView(table);
UIManager.getLookAndFeelDefaults().put("Table.ascendingSortIcon", new BevelArrowIcon(BevelArrowIcon.UP, false, false));
UIManager.getLookAndFeelDefaults().put("Table.descendingSortIcon", new BevelArrowIcon(BevelArrowIcon.DOWN, false, false));
SwingUtilities.updateComponentTreeUI(table);
add(pane, BorderLayout.NORTH);
JScrollPane pane1 = new javax.swing.JScrollPane();
//table.setAutoCreateRowSorter(true);
table1.setModel(new javax.swing.table.DefaultTableModel(
new Object[][]{
{"a", "q", "h", "v"},
{"b", "m", "l", "h"},
{"d", "c", "a", "d"},
{"j", "o", "y", "e"}
},
new String[]{
"Col 1", "Col 2", "Col 3", "Col 4"
}) {
private static final long serialVersionUID = 1L;
Class[] types = new Class[]{
String.class, String.class, String.class, String.class
};
@Override
public Class getColumnClass(int columnIndex) {
return types[columnIndex];
}
});
table1.setRowSorter(sorter);
table1.setPreferredScrollableViewportSize(table1.getPreferredSize());
pane1.setViewportView(table1);
add(pane1, BorderLayout.SOUTH);
for (int i = 0; i < table1.getColumnCount(); i++) {
RowColorRenderer rowRenderer = new RowColorRenderer(i);
TableColumn column = table1.getColumnModel().getColumn(i);
column.setCellRenderer(rowRenderer);
}
pack();
}
private class RowColorRenderer extends DefaultTableCellRenderer {
private static final long serialVersionUID = 1L;
private int colNo = 0;
RowColorRenderer(int col) {
colNo = col;
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
Component comp = super.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
JComponent jc = (JComponent) comp;
if (!isSelected) {
if (table.getValueAt(row, colNo) != null) {
String str = table.getValueAt(row, colNo).toString();
if (!str.isEmpty()) {
if (Pattern.compile("\\d").matcher(str).find()) {
if (((Pattern.compile("[02468]").matcher(str).find()))
&& (!(Pattern.compile("[13579]").matcher(str).find()))) {
setForeground(Color.magenta);
setBackground(Color.orange);
} else if ((!(Pattern.compile("[02468]").matcher(str).find()))
&& ((Pattern.compile("[13579]").matcher(str).find()))) {
setForeground(Color.blue);
setBackground(Color.yellow);
} else if (((Pattern.compile("[02468]").matcher(str).find()))
&& ((Pattern.compile("[13579]").matcher(str).find()))) {
setForeground(Color.red);
setBackground(Color.cyan);
}
setFont(new Font("Serif", Font.BOLD, 12));
setHorizontalAlignment(CENTER);
} else {
setBackground(table.getBackground());
setForeground(table.getForeground());
setFont(new Font("Serif", Font.PLAIN, 8));
setHorizontalAlignment(CENTER);
}
}
}
} else {
if (hasFocus) {
setFont(new Font("Serif", Font.BOLD, 12));
setForeground(Color.magenta);
setBackground(Color.orange);
}
}
return this;
}
}
static class BevelArrowIcon implements Icon {
public static final int UP = 0; // direction
public static final int DOWN = 1;
private static final int DEFAULT_SIZE = 11;
private Color edge1;
private Color edge2;
private Color fill;
private int size;
private int direction;
public BevelArrowIcon(int direction, boolean isRaisedView, boolean isPressedView) {
if (isRaisedView) {
if (isPressedView) {
init(UIManager.getColor("controlLtHighlight"), UIManager.getColor("controlDkShadow"), UIManager.getColor("controlShadow"), DEFAULT_SIZE, direction);
} else {
init(UIManager.getColor("controlHighlight"), UIManager.getColor("controlShadow"), UIManager.getColor("control"), DEFAULT_SIZE, direction);
}
} else {
if (isPressedView) {
init(UIManager.getColor("controlDkShadow"), UIManager.getColor("controlLtHighlight"), UIManager.getColor("controlShadow"), DEFAULT_SIZE, direction);
} else {
init(UIManager.getColor("controlShadow"), UIManager.getColor("controlHighlight"), UIManager.getColor("control"), DEFAULT_SIZE, direction);
}
}
}
public BevelArrowIcon(Color edge1, Color edge2, Color fill, int size, int direction) {
init(edge1, edge2, fill, size, direction);
}
@Override
public void paintIcon(Component c, Graphics g, int x, int y) {
switch (direction) {
case DOWN:
drawDownArrow(g, x, y);
break;
case UP:
drawUpArrow(g, x, y);
break;
}
}
@Override
public int getIconWidth() {
return size;
}
@Override
public int getIconHeight() {
return size;
}
private void init(Color edge1, Color edge2, Color fill, int size, int direction) {
edge1 = Color.red;
edge2 = Color.blue;
this.edge1 = edge1;
this.edge2 = edge2;
this.fill = fill;
this.size = size;
this.direction = direction;
}
private void drawDownArrow(Graphics g, int xo, int yo) {
g.setColor(edge1);
g.drawLine(xo, yo, xo + size - 1, yo);
g.drawLine(xo, yo + 1, xo + size - 3, yo + 1);
g.setColor(edge2);
g.drawLine(xo + size - 2, yo + 1, xo + size - 1, yo + 1);
int x = xo + 1;
int y = yo + 2;
int dx = size - 6;
while (y + 1 < yo + size) {
g.setColor(edge1);
g.drawLine(x, y, x + 1, y);
g.drawLine(x, y + 1, x + 1, y + 1);
if (0 < dx) {
g.setColor(fill);
g.drawLine(x + 2, y, x + 1 + dx, y);
g.drawLine(x + 2, y + 1, x + 1 + dx, y + 1);
}
g.setColor(edge2);
g.drawLine(x + dx + 2, y, x + dx + 3, y);
g.drawLine(x + dx + 2, y + 1, x + dx + 3, y + 1);
x += 1;
y += 2;
dx -= 2;
}
g.setColor(edge1);
g.drawLine(xo + (size / 2), yo + size - 1, xo + (size / 2), yo + size - 1);
}
private void drawUpArrow(Graphics g, int xo, int yo) {
g.setColor(edge1);
int x = xo + (size / 2);
g.drawLine(x, yo, x, yo);
x--;
int y = yo + 1;
int dx = 0;
while (y + 3 < yo + size) {
g.setColor(edge1);
g.drawLine(x, y, x + 1, y);
g.drawLine(x, y + 1, x + 1, y + 1);
if (0 < dx) {
g.setColor(fill);
g.drawLine(x + 2, y, x + 1 + dx, y);
g.drawLine(x + 2, y + 1, x + 1 + dx, y + 1);
}
g.setColor(edge2);
g.drawLine(x + dx + 2, y, x + dx + 3, y);
g.drawLine(x + dx + 2, y + 1, x + dx + 3, y + 1);
x -= 1;
y += 2;
dx += 2;
}
g.setColor(edge1);
g.drawLine(xo, yo + size - 3, xo + 1, yo + size - 3);
g.setColor(edge2);
g.drawLine(xo + 2, yo + size - 2, xo + size - 1, yo + size - 2);
g.drawLine(xo, yo + size - 1, xo + size, yo + size - 1);
}
}
}
【讨论】：
您需要创建一个自定义单元格渲染器类，例如，如果选择该类，它将更改前景色。
您的类将扩展 DefaultTableCellRenderer 并覆盖方法 getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)。
例如
public class SpreadsheetCellRenderer extends DefaultTableCellRenderer {
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
/* the following is the similar to DefaultTableCellRenderer */
if (isSelected) {
super.setForeground(Color.red);
} else {
super.setForeground(Color.black);
}
setText(value.toString());
return this;
}
}
然后您需要将该渲染器设置为默认渲染器，以便通过执行此操作来表示表中的字符串对象。
table.setDefaultRenderer(Class.forName("java.lang.String"), new SpreadsheetCellRenderer());
【讨论】：