JTable无法正确返回所选行 [英] JTable not returning selected row correctly

问题描述

我正在使用DefaultTableModel的扩展，如下所示:

I am working with an extension of the DefaultTableModel as follows:

这是更新后的NEW AchievementTableModel，以反映一些答案的输入.

This is the NEW AchievementTableModel after updating it to reflect input from some answers.

public AchievementTableModel(Object[][] c, Object[] co) {
    super(c,co);
}
public boolean isCellEditable(int r, int c) {return false;}
public void replace(Object[][] c, Object[] co) {
    setDataVector(convertToVector(c), convertToVector(co));
    fireTableDataChanged();
}

我的GUI是具有以下属性的JTable:

My GUI is a JTable that has the following properties:

if(table==null)
    table = new JTable(model);
else
    table.setModel(model);
table.setFillsViewportHeight(true);
table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
table.getTableHeader().setReorderingAllowed(false);
table.getTableHeader().setResizingAllowed(false);
table.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);
table.getColumnModel().setColumnSelectionAllowed(false);

我有一个JComboBox，用于选择要显示的数据.通过调用model.replace(cells)更新TableModel，然后再次运行上述表创建代码.

I have a JComboBox that selects which data to display. The TableModel is updated with a call to model.replace(cells) and then runs through the above table creation code again.

在GUI JTable中选择一行并打印table.getSelectedRow()值时，即使从第一个选择中选择了model.replace(cells)调用，我也总是在从第一个选择中更改表数据后得到-1.第一个JComboBox选项.有没有我想念的原因?我应该更改一些代码吗?

When selecting a row in the GUI JTable, and printing the table.getSelectedRow() value, I ALWAYS get -1 after changing the table data with a model.replace(cells) call from the first selection, even if I reselect the first JComboBox option. Is there a reason for this that I'm missing? Should I change some code?

与尝试回答此问题相比，代码已发生了很大变化，因此这是更新的代码.新的AchievementTableModel位于上方.

The code has changed a lot over trying to answer this question so here is the updated code. The new AchievementTableModel is above.

这会将模型和表格设置为正确查看并显示在ScrollPane中

This sets up the model and table to be viewed correctly and displayed in a ScrollPane

if(model==null)
    model = new AchievementTableModel(cells, columns);
else
    model.replace(cells, columns);
if(table==null) {
    table = new JTable(model);
    table.setFillsViewportHeight(true);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.getTableHeader().setReorderingAllowed(false);
    table.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);
    table.getColumnModel().setColumnSelectionAllowed(false);
    table.getTableHeader().setResizingAllowed(false);
} else
    table.setModel(model);

column = table.getColumn(columns[0]);
column.setPreferredWidth(25);
column = table.getColumn(columns[1]);
column.setPreferredWidth(225);
column = table.getColumn(columns[2]);
column.setPreferredWidth(40);
table.doLayout();

add(new JScrollPane(table), BorderLayout.CENTER);

推荐答案

在调用replace之后，您不应该使用新的JTable重新初始化表. fireTableDataChanged()方法将提醒您现有的表应重新绘制.发生的情况是，您正在查看放入面板中的表，但是您正在将变量更改为JTable的其他实例.当查询该新的但不可见的表时，它将为您提供-1的所选行数.如果您编辑帖子以显示该代码区域中发生的事情，这可能会有所帮助.

you shouldnt reinitialize your table with a new JTable after you call replace. the fireTableDataChanged() method will alert your existing table that it should repaint. what is happening is that you are looking at the table that you put into the panel, but you are changing the variable to a different instance of JTable. When you query that new, but not visible table, it will give you -1 for the selected row count. it might be helpful if you edit your post to display what is going on in that area of the code.

第二次修改:

代替此:

  if(model==null)
    model = new AchievementTableModel(cells, columns);
  else
    model.replace(cells, columns);
  if(table==null) {
    table = new JTable(model);
    table.setFillsViewportHeight(true);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.getTableHeader().setReorderingAllowed(false);
    table.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);
    table.getColumnModel().setColumnSelectionAllowed(false);
    table.getTableHeader().setResizingAllowed(false);
  } else
    table.setModel(model);

  column = table.getColumn(columns[0]);
  column.setPreferredWidth(25);
  column = table.getColumn(columns[1]);
  column.setPreferredWidth(225);
  column = table.getColumn(columns[2]);
  column.setPreferredWidth(40);
  table.doLayout();

  add(new JScrollPane(table), BorderLayout.CENTER);

改为执行此操作:

 if(model==null) {
    model = new AchievementTableModel(cells, columns);
 } else {
    model.setDataVector(cells, columns);
 }
 if(table==null) {
    table = new JTable(model);
    table.setFillsViewportHeight(true);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.getTableHeader().setReorderingAllowed(false);
    table.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);
    table.getColumnModel().setColumnSelectionAllowed(false);
    table.getTableHeader().setResizingAllowed(false);

    column = table.getColumn(columns[0]);
    column.setPreferredWidth(25);
    column = table.getColumn(columns[1]);
    column.setPreferredWidth(225);
    column = table.getColumn(columns[2]);
    column.setPreferredWidth(40);
    table.doLayout();

    add(new JScrollPane(table), BorderLayout.CENTER);
   } else {
    table.setModel(model);
   }

您无需将表添加到新的滚动窗格中，也无需在每次更改模型时将其重新添加到面板中.

you dont need to add the table to a new scrollpane and re-add it to the panel on each model change.

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