标签：jcombobox java swing jtable tablecelleditor
我有一个Jtable,我在其中添加了JComobox.
TableColumn sportColumn = jTable1.getColumnModel().getColumn(2);
comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Chasing toddlers");
comboBox.addItem("Speed reading");
comboBox.addItem("Teaching high school");
comboBox.addItem("None");
sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
我添加了一个像这样的jtable鼠标事件.
private void jTable1MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
try {
int row = jTable1.rowAtPoint(evt.getPoint());
int col = jTable1.columnAtPoint(evt.getPoint());
System.out.println("Row" + row + "Column" + col);
} catch (Exception e) {
e.printStackTrace();
}
}
我正在把行和列放到正确的位置.
但当我点击我添加Jcombobox的单元格时,它没有给出该行和列的放置.仍然我在组合框点击事件中调用了表格的clickevent但是它给了所有时间第0行甚至第0列这里的屏幕截图.
所以我怎么解决它所以我可以有那个行和列？
解决方法:
在我看来,你有三个基本选择……
你可以…
将CellEditorListener附加到DefaultCellEditor并监视editStopped事件…
editor.addCellEditorListener(new CellEditorListener() {
@Override
public void editingStopped(ChangeEvent e) {
System.out.println("Editing stopped");
TableCellEditor editor = (TableCellEditor) e.getSource();
Object value = editor.getCellEditorValue();
System.out.println("Selected value = " + value);
}
@Override
public void editingCanceled(ChangeEvent e) {
}
});
这个问题是,实际上无法确定已编辑的单元格.即使引用了JTable,当你收到这个事件时,表也不再处于编辑模式……所以你所知道的就是编辑器的价值……
你可以…
将TableModelListener附加到TableModel …
model.addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent e) {
int type = e.getType();
switch (type) {
case TableModelEvent.UPDATE:
if (e.getFirstRow() - e.getLastRow() == 0) {
TableModel model = (TableModel) e.getSource();
int row = e.getFirstRow();
int col = e.getColumn();
System.out.println("Update " + row + "x" + col + " = " + model.getValueAt(row, col));
}
break;
}
}
});
这会告诉你什么时候一个单元格的价值发生了变化(还有很多其他的东西,但这就是我们感兴趣的东西),它不会告诉你什么,这就是它改变的原因.
这种方法很好,因为它提供了您需要知道的所有信息,以便找到值和单元格.
你可以…
只需覆盖TableModel的setValueAt方法,并提供自己的某种通知……
虽然这有点复制了TableModelListener的功能,但您可以设计事件信息,以便它提供更多相关信息,因为TableModelEvent涵盖了很多用户案例……
例
下面是一个TableRenderDemo的示例,并进行了修改以演示前两个概念
import java.awt.BorderLayout;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import java.awt.Component;
import java.awt.Dimension;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableModel;
/**
* TableRenderDemo is just like TableDemo, except that it explicitly initializes
* column sizes and it uses a combo box as an editor for the Sport column.
*/
public class TableRenderDemo extends JPanel {
public TableRenderDemo() {
super(new BorderLayout());
JTable table = new JTable(new MyTableModel());
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Set up column sizes.
initColumnSizes(table);
//Fiddle with the Sport column's cell editors/renderers.
setUpSportColumn(table, table.getColumnModel().getColumn(2));
//Add the scroll pane to this panel.
add(scrollPane);
}
/*
* This method picks good column sizes.
* If all column heads are wider than the column's cells'
* contents, then you can just use column.sizeWidthToFit().
*/
private void initColumnSizes(JTable table) {
MyTableModel model = (MyTableModel) table.getModel();
model.addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent e) {
int type = e.getType();
switch (type) {
case TableModelEvent.UPDATE:
if (e.getFirstRow() - e.getLastRow() == 0) {
TableModel model = (TableModel) e.getSource();
int row = e.getFirstRow();
int col = e.getColumn();
System.out.println("Update " + row + "x" + col + " = " + model.getValueAt(row, col));
}
break;
}
}
});
TableColumn column = null;
Component comp = null;
int headerWidth = 0;
int cellWidth = 0;
Object[] longValues = model.longValues;
TableCellRenderer headerRenderer
= table.getTableHeader().getDefaultRenderer();
for (int i = 0; i < 5; i++) {
column = table.getColumnModel().getColumn(i);
comp = headerRenderer.getTableCellRendererComponent(
null, column.getHeaderValue(),
false, false, 0, 0);
headerWidth = comp.getPreferredSize().width;
comp = table.getDefaultRenderer(model.getColumnClass(i)).
getTableCellRendererComponent(
table, longValues[i],
false, false, 0, i);
cellWidth = comp.getPreferredSize().width;
column.setPreferredWidth(Math.max(headerWidth, cellWidth));
}
}
public void setUpSportColumn(final JTable table,
TableColumn sportColumn) {
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Knitting");
comboBox.addItem("Speed reading");
comboBox.addItem("Pool");
comboBox.addItem("None of the above");
TableCellEditor editor = new DefaultCellEditor(comboBox);
editor.addCellEditorListener(new CellEditorListener() {
@Override
public void editingStopped(ChangeEvent e) {
System.out.println("Editing stopped");
TableCellEditor editor = (TableCellEditor) e.getSource();
Object value = editor.getCellEditorValue();
System.out.println("Selected value = " + value);
}
@Override
public void editingCanceled(ChangeEvent e) {
}
});
sportColumn.setCellEditor(editor);
//Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer
= new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
sportColumn.setCellRenderer(renderer);
}
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
private Object[][] data = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
public final Object[] longValues = {"Jane", "Kathy",
"None of the above",
new Integer(20), Boolean.TRUE};
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public int getRowCount() {
return data.length;
}
@Override
public String getColumnName(int col) {
return columnNames[col];
}
@Override
public Object getValueAt(int row, int col) {
return data[row][col];
}
/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
@Override
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
/*
* Don't need to implement this method unless your table's
* editable.
*/
@Override
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;
}
}
/*
* Don't need to implement this method unless your table's
* data can change.
*/
@Override
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("TableRenderDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
TableRenderDemo newContentPane = new TableRenderDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
标签：jcombobox,java,swing,jtable,tablecelleditor 来源： https://codeday.me/bug/20190830/1771037.html
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。