Editable Comboboxes

When the bean generator creates a gettor and settor for an Editable ComboBox, by default it returns a String on the settor and takes a string parameter on the gettor. It can be useful to change the settor to take an Object class and the gettor to return an Object type. This allows you to determine the user selection using ChoiceDescriptors.

If a type of Object is detected for the gettor and settor, the system will expect either a ChoiceDescriptor or a type Object instead of a formatted string.

The following example assumes that Editable is an editable ComboBox that has either a Double value, uses a system value, or is not set.

public Object getEditable() 
{ 
    if (m_setting == SYSTEMVALUE) 
    { 
       return new ChoiceDescriptor("choice1","System Value"); 
    } 
    else if (m_setting == NOTSET) 
    { 
       return new ChoiceDescriptor("choice2","Value not set"); 
    } 
    else 
    { 
       return m_doubleValue; 
    } 
}

Similarly, when a type of Object is detected for the gettor and settor, the system will return an Object which is either a ChoiceDescriptor containing the selected choice or a type Object.

     public void setEditable(Object item) 
     { 
         if (ChoiceDescriptor.class.isAssignableForm(obj.getClass())) 
         { 
            if (((ChoiceDescriptor)obj).getName().equalsIgnoreCase("choice1")) 
                m_setting = SYSTEMVALUE; 
            else 
                m_setting = NOTSET; 
         } 
         else if (Double.class.isAssignableFrom(obj.getClass())) 
         { 
            m_setting = VALUE; 
            m_doubleValue = (Double)obj; 
         } 
         else 
         { /* error processing */ } 
     }