java - 如何在 TableModel 中定义主动更新的 CellEditor

Question

我正在创建一个扩展 AbstractTableModel 的 TableModel。但其内容会定期更改，并且列数会根据显示的数据而变化。有时，我需要使用 ComboBox 来编辑第 2 列中的单元格，有时我需要使用 ComboBox 来编辑第 3 列中的单元格。

我知道您可以通过执行 table.getColumnModel().getColumn(2).setCellEditor(new DefaultCellEditor(myComboBox));

我可以动态设置 TableModel 中的 CellEditor 吗，以便在调用 table.updateUI( 时更新 CellEditor )？

编辑:我基本上是在传递我正在使用的 TableModel 一个大的 WellCollection 数据结构。冒着让您厌倦细节的风险，它由 Wells 组成，其中由 Attributes 组成，后者又由 ProposeValues 组成。不过，这并不是太重要。重要的是，我希望用户能够翻转属性，并在单击“下一步”时在表中显示不同的 ProposeValues(我之前使用 updateUI() 完成了这一点) )。

请注意，属性可以是高程类型，也可以不是高程类型。如果是高程类型，则需要额外增加一列。

这是我的代码:

public class ProposedValueTableModel extends AbstractTableModel{
    private WellCollection wells;

    public ProposedValueTableModel(WellCollection wells){
        this.wells = wells;
    }


    @Override
    public int getColumnCount() {
        // if we're dealing with elevation values, we want fields for the value, the elevation type,
        // the source, and additional comments. If not, only show value, source, and comments.
        if(wells.getCurrAttribute().isElevationType())
            return 4;
        else return 3;
    }

    @Override
    public int getRowCount() {
        //NOTE: add 1 for extra, blank row! 
        return wells.getCurrAttribute().getProposedValues().size()+1;
    }

    @Override
    public Object getValueAt(int row, int col) {
        //TODO: convert this to handy dandy switch statements
        // make the last row blank to allow entries
        if (row==wells.getCurrAttribute().getProposedValues().size())
            return "";
        ProposedValue propVal = wells.getCurrAttribute().getProposedValues().get(row);
        //if we're NOT dealing with an elevation type, simply have three fields
        if(wells.getCurrAttribute().isElevationType()==false){
            switch(col){
            case 0:
                return propVal.val;
            case 1:
                return propVal.source;
            case 2:
                return propVal.comment;

            }
        }
        // if it IS an elevation value, include elevation type
        else{
            switch(col){
            case 0:
                    return propVal.val;
                case 1:
                    return propVal.elevType;
                case 2:
                    return propVal.source;
                case 3:
                    return propVal.comment;
            }
        }
        return "";
    }

    public String getColumnName(int col){

        if(wells.getCurrAttribute().isElevationType() ==false){
            switch(col){
                case 0:
                    return "Proposed value";
                case 1:
                    return "Source";
                case 2:
                    return "Comment";
            }
        }
        else{
            switch(col){
                case 0:
                    return "Proposed value";
                case 1:
                    return "Type";
                case 2:
                    return "Source";
                case 3:
                    return "Comment";
            }
        }
        return "header";
    }

    public boolean isCellEditable(int row, int col){
        return true;
    }

    public void setValueAt(Object value, int row, int col){
        // we're adding something to the last row, then add a new ProposedValue to the proposedValues array
        if(row == wells.getCurrAttribute().getProposedValues().size()){
            wells.getCurrAttribute().getProposedValues().add(new ProposedValue());
        }
        ProposedValue propVal = wells.getCurrAttribute().getProposedValues().get(row);
        if(wells.getCurrAttribute().isElevationType()==false){
            switch(col){
                case 0:
                    // Value
                    propVal.val = (String)value; break;
                case 1:
                    // Source
                    propVal.source = (String)value; break;
                case 2:
                    // Comment
                    propVal.comment = (String)value; break;
            }
        }
        else{
            switch(col){
                case 0:
                    // Value
                    propVal.val = (String)value; break;
                case 1:
                    // Elevation type
                    propVal.elevType = (String)value; break;
                case 2:
                    // Source
                    propVal.source = (String)value; break;
                case 3:
                    // Comment
                    propVal.comment = (String)value; break;
            }
        }
        //TODO: find out why this is necessary
        fireTableCellUpdated(row, col);
    }
}

Answer 1

Can I set the CellEditor within my TableModel dynamically, so that the CellEditor is updated when I call table.updateUI()?

• 不，这不是更新 JTables View 的正确方法

I'm creating a TableModel which extends AbstractTableModel. Its contents, though, changes regularly and the number of columns changes depending on the data displayed. Occasionally, I'll need to use a ComboBox to edit the cells in column 2, and occasionally I'll need a ComboBox for cells in column 3.

• code example from the Oracle turorial 有什么问题吗？ ,

Can I set the CellEditor within my TableModel dynamically

• 注意 XxxTableModel 仅将 JComboBox 的字符串值存储为 XxxTableCellEditor

<小时/>

为了获得更好的帮助，请尽快发布 SSCCE ，简短，可运行，可编译，大约是 JFrame 和 JScrollPane 中的 JTable，AbstractTableModel 的硬编码值存储为 局部变量