java 编辑时如何选择JTable单元格中的所有文本
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How to select all text in JTable cell when editing
提问by user564874
I would like to have the editor in my editable JTables select all text in the cell when starting to edit. I have tried a couple of things that all revolve around calling JTextComponent.selectAll() on the component that is returned from the TableCellEditor.getTableCellEditorComponent method. None of the things I tried worked.
我希望在我的可编辑 JTables 中的编辑器在开始编辑时选择单元格中的所有文本。我尝试了几件事情，这些事情都围绕着在从 TableCellEditor.getTableCellEditorComponent 方法返回的组件上调用 JTextComponent.selectAll() 。我尝试过的所有事情都没有奏效。
In my latest attempt, I altered the SimpleTableDemo class from the Swing tutorial to use a custom TableCellEditor that calls the selectAll method. In the debugger I can see that the selectAll() method is being called, but the table still goes into edit mode without selecting the text in the cell (or perhaps the selection is being cleared before display). That code is below. Can anybody tell me where I'm going wrong?
在我最近的尝试中，我更改了 Swing 教程中的 SimpleTableDemo 类，以使用调用 selectAll 方法的自定义 TableCellEditor。在调试器中，我可以看到 selectAll() 方法正在被调用，但表格仍然进入编辑模式而不选择单元格中的文本（或者可能在显示之前选择被清除）。该代码如下。谁能告诉我我哪里错了？
import javax.swing.DefaultCellEditor;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import javax.swing.text.JTextComponent;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class SimpleTableDemo extends JPanel {
private boolean DEBUG = false;
public SimpleTableDemo() {
super(new GridLayout(1, 0));
String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
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)}
};
final JTable table = new SelectingTable(data, columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
if (DEBUG) {
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
printDebugData(table);
}
});
}
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this panel.
add(scrollPane);
}
private void printDebugData(JTable table) {
int numRows = table.getRowCount();
int numCols = table.getColumnCount();
javax.swing.table.TableModel model = table.getModel();
System.out.println("Value of data: ");
for (int i = 0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j = 0; j < numCols; j++) {
System.out.print(" " + model.getValueAt(i, j));
}
System.out.println();
}
System.out.println("--------------------------");
}
/**
* 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("SimpleTableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
SimpleTableDemo newContentPane = new SimpleTableDemo();
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();
}
});
}
class SelectingTable extends JTable {
public SelectingTable(Object[][] data, String[] columnNames) {
super(data, columnNames);
TableColumnModel model = super.getColumnModel();
for (int i = 0; i < super.getColumnCount(); i++) {
TableColumn tc = model.getColumn(i);
tc.setCellEditor(new SelectingEditor(new JTextField()));
}
}
class SelectingEditor extends DefaultCellEditor {
public SelectingEditor(JTextField textField) {
super(textField);
}
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
if (c instanceof JTextComponent) {
JTextComponent jtc = (JTextComponent) c;
jtc.requestFocus();
jtc.selectAll();
}
return c;
}
}
}
}
采纳答案by camickr
The Table Select All Editorshould work for you. It is the preferred solution so you don't have to keep creating custom editors. That is the columns containing integers should only accept integers. With you current code
该表全部选择编辑应该为你工作。它是首选解决方案，因此您不必继续创建自定义编辑器。那就是包含整数的列应该只接受整数。使用您当前的代码
Your code does work partially. If you start editing using the F2 key, then the text is selected. However, when you use the mouse and double click on the cell then the second mouse event is passed to the editor so the caret can be positioned where you clicked and this removes the selection. A solution for this is:
您的代码确实部分工作。如果您使用 F2 键开始编辑，则会选择文本。但是，当您使用鼠标并双击单元格时，第二个鼠标事件将传递给编辑器，因此插入符号可以定位在您单击的位置，这将删除选择。对此的解决方案是：
final JTextComponent jtc = (JTextComponent)c;
jtc.requestFocus();
//jtc.selectAll();
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
jtc.selectAll();
}
});
回答by Leonard
public class SelectAllCellEditor extends DefaultCellEditor
{
public SelectAllCellEditor(final JTextField textField ) {
super( textField );
textField.addFocusListener( new FocusAdapter()
{
public void focusGained( final FocusEvent e )
{
textField.selectAll();
}
} );
}
}
回答by Hymanmarrows
JTables can have many different components in a cell. It is usually a JTextField when you are editing. You need to firstly get the field and then select. You can get the length of the text by working through your modal. This code should get you started, you may want to place it within a List selection handler. ie.
JTables 在一个单元格中可以有许多不同的组件。当您进行编辑时，它通常是一个 JTextField。您需要先获取该字段，然后再进行选择。您可以通过处理模态来获取文本的长度。此代码应该可以帮助您入门，您可能希望将其放置在列表选择处理程序中。IE。
ListSelectionModel rowSM = this.getSelectionModel();
rowSM.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e){
DefaultCellEditor ed = (DefaultCellEditor)this.getCellEditor();
JTextField jf = (JTextField)ed.getComponent();
jf.select(0, *text.length()*);
jf.requestFocusInWindow();
}
});
Notably you will need to find the text.length(). Possibly something such as:
值得注意的是，您需要找到 text.length()。可能是这样的：
this.getModel().getValueAt(this.getSelectedRow(), this.getSelectedColumn()).length();
DisclaimerI haven't tested this code.
免责声明我还没有测试过这段代码。
