[英]Custom renderer with multi-line columns for JTable
我使用的是用 NetBeans GUI 编辑器创建的JTable
,我只更改了列数和名称。
当我用 SQL 查询填充表时,包含换行符的字符串显示在一行上。
我该如何解决?
这是我通过单击表格和 Netbeans 中的“自定义代码”看到的:
queryTableStatoPackage = new javax.swing.JTable();
queryTableStatoPackage.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"Nome Package", "ID Package", "Nome Progetto", "Codice Progetto", "Versione", "Stato", "Nota"
}
));
jScrollPane10.setViewportView(queryTableStatoPackage);
“Nota”是涉及的列
编辑
变化:
我创建了这个类
package db_operation_package;
import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
public class NewLineSupportRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row,
int column) {
Object val = value;
if (val instanceof String) {
val = convertNewLinesToHTML(val.toString());
}
return super.getTableCellRendererComponent(table, val, isSelected, hasFocus, row, column);
}
private String convertNewLinesToHTML(String s) {
if (s.contains("\n")) {
return "<html>" + s.replace("\n", "<br>") + "</html>";
}
return s;
}
public void updateRowHeight(JTable table, int margin) {
final int rowCount = table.getRowCount();
final int colCount = table.getColumnCount();
for (int i = 0; i < rowCount; i++) {
int maxHeight = 0;
for (int j = 0; j < colCount; j++) {
final TableCellRenderer renderer = table.getCellRenderer(i, j);
maxHeight = Math.max(maxHeight, table.prepareRenderer(renderer, i, j).getPreferredSize().height);
}
table.setRowHeight(i, maxHeight + margin);
}
}
}
这是netbeans为表生成的代码
queryTableStatoClasse = new javax.swing.JTable();
queryTableStatoClasse.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"Nome Classe", "Codice Classe", "Nome Progetto", "Codice Progetto", "Versione", "Stato", "Nota"
}
));
jScrollPane9.setViewportView(queryTableStatoClasse);
我选择了自定义代码并添加了以下内容:
queryTableStatoClasse = new javax.swing.JTable();
queryTableStatoClasse.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"Nome Classe", "Codice Classe", "Nome Progetto", "Codice Progetto", "Versione", "Stato", "Nota"
}
));
jScrollPane9.setViewportView(queryTableStatoClasse);
NewLineSupportRenderer customRenderer = new NewLineSupportRenderer();
queryTableStatoClasse.getColumnModel().getColumn(1).setCellRenderer(customRenderer);
customRenderer.updateRowHeight(queryTableStatoClasse, 0);
它似乎不起作用,我在修改您的代码时做错了什么?
编辑 2
您应该将带有新行的文本转换为 Swing 支持的基本 HTML 表示。 最好的方法是: 使用渲染器。 您还需要更新行高,因为表格不会自动生成。 例子:
import java.awt.Component;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
/**
* <code>TableExample</code>.
*/
public class TableExample {
private static final String[][] TABLE_DATA = new String[][] {{"One", "String with one \nnew line"},
{"Two", "String \nwith two \nnew lines"}, {"Three", "String \nwith \nmany \nnew \nlines"}};
private class NewLineSupportRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row,
int column) {
Object val = value;
if (val instanceof String) {
val = convertNewLinesToHTML(val.toString());
}
return super.getTableCellRendererComponent(table, val, isSelected, hasFocus, row, column);
}
}
private String convertNewLinesToHTML(String s) {
if (s.contains("\n")) {
return "<html>" + s.replace("\n", "<br>") + "</html>";
}
return s;
}
private void initUI() {
JTable table = new JTable(new DefaultTableModel(TABLE_DATA, new String[] {"Numbers", "Texts"}));
table.getColumnModel().getColumn(1).setCellRenderer(new NewLineSupportRenderer());
updateRowHeight(table, 0);
JFrame frm = new JFrame("Table with new lines");
frm.add(new JScrollPane(table));
frm.pack();
frm.setLocationRelativeTo(null);
frm.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frm.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new TableExample()::initUI);
}
private static void updateRowHeight(JTable table, int margin) {
final int rowCount = table.getRowCount();
final int colCount = table.getColumnCount();
for (int i = 0; i < rowCount; i++) {
int maxHeight = 0;
for (int j = 0; j < colCount; j++) {
final TableCellRenderer renderer = table.getCellRenderer(i, j);
maxHeight = Math.max(maxHeight, table.prepareRenderer(renderer, i, j).getPreferredSize().height);
}
table.setRowHeight(i, maxHeight + margin);
}
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.