目前,我想要實現我的JTable中的JPopupMenu,允許編輯單元格的使用的TableModel setCellEditable並自動將該值設置爲false
@Override
public void actionPerformed(ActionEvent e){
if(e.getActionCommand() == "Unlock"){
pTableModel.setCellEditable(this.getSelectedRow(), this.getSelectedColumn(), true);
}
}
這是TableModel的相關方法解鎖
public void setCellEditable(int row, int col, boolean value) {
editableCells[row][col] = value;
this.fireTableCellUpdated(row, col); // I don't think I actually need this
//because nothing in the cell has changed yet?
}
isCellEditable()
然後返回editableCells [] []數組的值。 但在我的代碼中,當焦點丟失時,應該將單元格更改爲不可編輯?
在一個稍微相關的筆記上,我還想讓單元立即獲得重點。我已閱讀getEditorComponent().requestFocus()
- 但這看起來並不完全正確,因爲當時沒有編輯任何內容,只選擇單元格(並且使用該方法引發似乎支持我的思考過程的nullpointerexception)。
任何人都可以指出我正確的方向嗎?我看不到我要去哪裏錯了。由於
**編輯:爲了鎖定細胞丟失焦點時我嘗試添加自定義CellRenderer與focusListener的:
private class CustomCellRenderer extends DefaultTableCellRenderer{
public CustomCellRenderer(){
addFocusListener(new FocusAdapter(){
@Override
public void focusLost(FocusEvent e) {
pTableModel.setCellEditable(getSelectedRow(), getSelectedColumn(), false);
}
});
}
}
但似乎並沒有任何工作,但我可能實現它不正確(雖然我已經簽了渲染已添加)
SSCCE
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
public class CellTest {
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run(){
createAndShowGUI();
}
});
}
private static void createAndShowGUI(){
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MyPanel panel = new MyPanel();
f.add(panel);
f.pack();
f.setVisible(true);
}
}
class MyPanel extends JPanel implements ActionListener{
private JTable table;
private MyTableModel model;
private JScrollPane sp;
private List<Person> people;
MyPanel(){
people = new ArrayList<>();
people.add(new Person("Will", 1));
model = new MyTableModel(people);
table = new JTable(model);
table.addMouseListener(new MouseAdapter(){
@Override
public void mousePressed(MouseEvent e){
maybeShowPopup(e);
}
@Override
public void mouseReleased(MouseEvent e){
maybeShowPopup(e);
}
});
table.setFillsViewportHeight(true);
sp = new JScrollPane(table);
this.add(sp);
}
@Override
public void actionPerformed(ActionEvent e){
if(e.getActionCommand().equals("Unlock")) {
model.setCellEditable(table.getSelectedRow(),table.getSelectedColumn(),true);
}
}
private JPopupMenu createPopupMenu(){
JPopupMenu pop = new JPopupMenu();
JMenuItem item = new JMenuItem("Unlock");
item.addActionListener(this);
pop.add(item);
return pop;
}
private void maybeShowPopup(MouseEvent e){
int currentRow = table.rowAtPoint(e.getPoint());
if(currentRow >= 0 && currentRow < table.getRowCount())
table.setRowSelectionInterval(currentRow, currentRow);
else
table.clearSelection();
if(table.getSelectedRow() < 0) return;
if(e.isPopupTrigger() && e.getComponent() instanceof JTable){
JPopupMenu pop = createPopupMenu();
pop.show(e.getComponent(), e.getX(), e.getY());
}
}
}
而且爲TableModel和數據類:
class MyTableModel extends AbstractTableModel{
private List<Person> data;
private String[] colNames = new String[]{"Name","Age"};
private boolean[][] editableCells;
public MyTableModel(List<Person> data){
this.data = data;
this.editableCells = new boolean[this.getRowCount()][this.getColumnCount()];
}
@Override
public int getRowCount() { return data.size(); }
@Override
public int getColumnCount() { return colNames.length; }
@Override
public Object getValueAt(int row, int col){
Person p = data.get(row);
switch(col){
case 0 : return p.getName();
case 1 : return p.getAge();
}
return null;
}
@Override
public boolean isCellEditable(int row, int col){
return editableCells[row][col];
}
public void setCellEditable(int row, int col, boolean value){
editableCells[row][col] = value;
}
@Override
public void setValueAt(Object value, int row, int col){
Person p = data.get(row);
switch(col){
case 0 : p.setName((String)value);break;
case 1 : p.setAge((int)value);break;
}
this.setCellEditable(row, col, false);
this.fireTableCellUpdated(row, col);
}
public void setData(List<Person> data){
this.data = data;
this.fireTableDataChanged();
}
}
class Person {
private String name;
private int age;
public Person(String name, int age){
this.name = name;
this.age = age;
}
public void setName(String name){ this.name = name;}
public String getName(){ return name; }
public void setAge(int age){ this.age = age;}
public int getAge(){ return age; }
}
道歉長度 - 我不知道如何使它無需重新創建也許什麼不好,我想實現更短。在這個代碼中有一個錯誤,那就是右鍵單擊和'解鎖',你必須已經左鍵單擊一行,否則它們將是一個arrayIndexOutOfBounds異常。我還沒有找到確切的原因。
但基本上,當你右鍵單擊然後選擇解鎖,我想光標出現在單元格中。此時您單擊解鎖,然後必須雙擊單元格。
渲染器不是真正的組件。它只是用來繪製組件的圖像。它永遠不會成爲焦點。不要使用「==」來比較字符串。使用'equals(...)'方法。發佈一個證明問題的適當的[mcve]。 – camickr
對不起,它不是那麼簡單,但我已經發布了一個完整的工作示例,並描述了我想要實現的內容。 – NickW