编辑EditingSupport中的ComboBoxCellEditor

Question

如果用户选择了“”项，我希望使ComboBoxCelleDitor可编辑。我尝试使用了两个Celleditor，一个是TextCelleditor，一个是ComboBoxCelleditor。并且如果用户选择“”项，CelleDitor将切换到TextCelleDitor。但不管用。因为ComboIndex有一个ArrayOutOfBoundException。有人能帮我修改我的代码吗？原始EditingSupport的代码如下所示：

import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ComboBoxCellEditor;
import org.eclipse.jface.viewers.EditingSupport;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TextCellEditor;

public class SecondColEdittingSupport extends EditingSupport {
    private final TableViewer viewer;
    private final CellEditor comboEditor;
    private final CellEditor textEditor;
    Logger logger = Logger.getLogger(this.getClass());
    public static String[] names ={ " ","SMALLINT ", "INTEGER", "BIGINT", 
    "DECIMAL", "NUMERIC", 
            "REAL", "TIMESTAMP", "VARCHAR", "CHAR", "TEXT"};

    public SecondColEdittingSupport(TableViewer viewer) {
        super(viewer);
        this.viewer = viewer;
        comboEditor = new ComboBoxCellEditor(viewer.getTable(), names);
        textEditor = new TextCellEditor(viewer.getTable());
    }

    private int getNameIndex(String name) {
        for (int i = 1; i < SecondColEdittingSupport.names.length; i++) {
            if (SecondColEdittingSupport.names[i].equals(name))
                return i;
        }
        return 0;
    }

    @Override
    protected CellEditor getCellEditor(Object element) {
        String[] str = (String[]) element;
        if (getNameIndex(str[1]) != 0) {
            return comboEditor;
        }
        return textEditor;
    }

    @Override
    protected boolean canEdit(Object element) {
        return true;
    }

    @Override
    protected Object getValue(Object element) {
        String[] str = (String[]) element;
        if (getNameIndex(str[1]) != 0) {
            return getNameIndex(str[1]);
        }
        return  str[1];
    }

    @Override
    protected void setValue(Object element, Object userInputValue) {
        String[] str = (String[]) element;
        if (getNameIndex(str[1]) != 0) {
            Integer comboIndex = (Integer) userInputValue;
            str[1] = SecondColEdittingSupport.names[comboIndex];
        } else {
            str[1] = String.valueOf(userInputValue);
        }
        viewer.update(element, null);
    }

}

堆栈跟踪显示如下：

Answer 1

ComboBoxCelleDitor本身是可编辑的，因为它使用JFace Combo（特别是Ccombo)。可以很容易地覆盖选定的文本。在本例中，setvalue返回-1作为value（在OP的代码UserInputValue)。

因此，获得一个可编辑的ComboBoxCelleDitoris就足以在setValue-method中处理此值：

@Override
protected void setValue(Object element, Object value) {
    if ((int)value == -1) {
        str[1] = ((CCombo)editor.getControl()).getText();
    } else {
        str[1] = names[(int)value];
    }
    viewer.update(element, null);
}