无法在自定义属性编辑器中访问JList项

时间:2012-02-22 10:29:05

标签: java swing propertyeditor

我在NetBeans编辑器区域中有一个简单的OutlineView,它显示了两列。第二列单元格的内容应通过PropertySupport使用自定义属性编辑器进行设置。自定义属性编辑器包含允许多个项目选择的JList。

PropertySupport类看起来像

public class CityProperty extends PropertySupport.ReadWrite<String> { 

    Customer c; 

    public CityProperty(Customer c, HashMap<String, Boolean> optionalCities) { 
        super("city", String.class, "City", "Name of City"); 
        setValue("labelData", optionalCities); 
        this.c = c; 
    } 

    @Override 
    public String getValue() throws IllegalAccessException, InvocationTargetException { 
        return c.getCity(); 
    } 

    @Override 
    public PropertyEditor getPropertyEditor() { 
        return new CityPropertyEditor(c); 
    } 

    @Override 
    public void setValue(String newValue) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException { 
        c.setCity(newValue); 
    } 
}

PropertyEditor看起来像

public class CityPropertyEditor extends PropertyEditorSupport implements ExPropertyEditor { 

    Customer c; 
    PropertyEnv env; 
    public CityPropertyEditorPanel editor = null; 

    public CityPropertyEditor(Customer c) { 
        this.editor = new CityPropertyEditorPanel(); 
        this.c = c; 
    } 

    @Override 
    public String getAsText() { 
        String s = (String) getValue(); 
        if (s == null) { 
            return "No City Set"; 
        } 
        return s; 
    } 

    @Override 
    public void setAsText(String s) { 
        setValue(s); 
    } 

    @Override 
    public void attachEnv(PropertyEnv env) { 
        this.env = env; 
    } 

    @Override 
    public Component getCustomEditor() { 
        HashMap<String, Boolean> cities = (HashMap<String, Boolean>) env.getFeatureDescriptor().getValue("labelData"); 
        DefaultListModel model = new DefaultListModel(); 


        /* selection in the gui */ 
        int[] selectedIdxs = new int[cities.size()]; 
        int idx = 0; 
        for (String str : cities.keySet()) { 
            model.addElement(str); 
            if (cities.get(str) == Boolean.FALSE) { 
                selectedIdxs[idx] = model.indexOf(str); 
                idx++; 
            } 
        } 
        if (selectedIdxs.length > 0){ 
            editor.jList.setSelectedIndices(selectedIdxs); 
        } 
        editor.jList.setModel(model); 

        return editor; 
    } 

    @Override 
    public boolean supportsCustomEditor() { 
        return true; 
    } 

    @Override 
    public Object getValue() { 
        System.out.println("getValue(): " + editor.jList.getSelectedValuesList());    
        System.out.println("getValue(): " + editor.jtf.getText()); 

        return super.getValue(); 
    } 
}

和编辑器CityPropertyEditorPanel()本身是一个带有JList和JTextField的简单JPanel。

我的代码创建了一个很好的自定义编辑器,其中列出了所有项目,但它没有从列表中返回新选择的项目。我现在的问题是,如何将选定的项目从JList返回到CityProperty类?我的尝试是使用

editor.jList.getSelectedValuesList()); 
在getValue()方法中

但结果始终为空。对于JTextField也是如此,其中新的写入值也不会被传回。

我在这里做错了什么?

1 个答案:

答案 0 :(得分:0)

我想我找到了解决方案/解决方法。

当我激活PropertyEnv.STATE_NEEDS_VALIDATION功能时,CityPropertyEditor识别出“编辑器”对象的内容。然后CityPropertyEditor中的代码必须覆盖attacheEnv方法并包含VetoableChangeListener

@Override
public void attachEnv(PropertyEnv env) {
    this.env = env;
    env.setState(PropertyEnv.STATE_NEEDS_VALIDATION);

    env.addVetoableChangeListener(new VetoableChangeListener() {

        @Override
        public void vetoableChange(PropertyChangeEvent evt) throws PropertyVetoException {
            /* User has pushed OK */
            for (Entry entry : editor.isoValNew.entrySet()){
                isoVal.put((Double) entry.getKey(), (Boolean) entry.getValue());
            }
        }
    });
}

而CityPropertyEditorPanel()中的Jlist本身有一个ListSelectionListener,它更新Map变量isoValNew

    isoValueList.addListSelectionListener(new ListSelectionListener() {

        @Override
        public void valueChanged(ListSelectionEvent e) {
            isoValNew.clear();

            for (Object obj : isoValueList.getSelectedValues()) {
                isoValNew.put((Double) obj, Boolean.TRUE);
            }
        }
    });

我确信这不是一个完美的解决方案,但在我的情况下它可以正常工作。

希望这有助于某人。