EOSwingComboBoxPlugin

Inherits from:
EOValueSelectionAssociation.ValueSelectionPlugin (EOInterface) : EOWidgetAssociation.WidgetPlugin (EOInterface) : Object

Implements:
java.awt.event.ActionListener
EOWidgetAssociation.WidgetPlugin.Formatting (EOInterface)
NSDisposable

Package:
com.webobjects.eointerface.swing

Class Description

An EOSwingComboBoxPlugin object displays an attribute or to-one relationship value in an JComboBox. The items in the combo box can be entered manually, or for a relationship, constructed dynamically from values supplied by an EODisplayGroup. EOSwingComboBoxPlugin is very similar to the EOSwingPopUpButtonPlugin.

Examples

There are three basic ways to configure a combo box and it's association. Each is described below.

Selecting a String from a Static List

Suppose you have a Movie display group and you want to provide a combo box for setting the rating from a static list of strings. In this example, a Movie object's rating is a string property rather than a relationship to a Rating object). To do this, in Interface Builder, type the list of ratings into the combo box. Control-drag a connection from the combo box to the Movie display group. Choose EOSwingComboBoxPlugin in the Connections inspector, and bind the selectedTitle aspect to the "rating" key.

Selecting a String from a Dynamic List

This example is similar to the previous one, except in this example, a Movie object's rating is chosen from strings in a Rating database table. There's a Rating EODisplayGroup that fetches the ratings into Rating objects, and the combo box is filled from the "ratingString" property of the rating display group's Rating objects. To do this, in Interface Builder, control-drag a connection from the combo box to the Ratings display group. Choose EOSwingComboBoxPlugin in the Connections inspector, and bind the titles aspect to the "ratingString" key. Similarly, control-drag a connection from the combo box to the Movie display group. Again choose EOSwingComboBoxPlugin in the Connections inspector, and bind the selectedTitle aspect to the "rating" key.

Selecting the Destination of a To-One Relationship

Suppose you have a list of employees and want to assign each employee a department. In terms of the object model, you want to assign a Department object as the destination of an Employee object's department relationship. To do this, in Interface Builder, control-drag a connection from the combo box to a Department display group. Choose EOSwingComboBoxPlugin in the Connections inspector, and bind the titles aspect to the "name" key. Similarly, control-drag a connection from the combo box to the Employee display group. Again choose EOSwingComboBoxPlugin in the Connections inspector, and bind the selectedObject to the "department" key.

If the selectedObject aspect is bound and the user types a value that doesn't match any of those currently in the list, an error panel is displayed.

Interfaces Implemented

NSDisposable

EOWidgetAssociation.WidgetPlugin.Formatting

setValueFormatter
valueFormatter

java.awt.event.ActionListener

actionPerformed

Method Types

All methods

EOSwingComboBoxPlugin
breakConnection
establishConnection
selectionIndex
setSelectionIndex
setTitlesFromObjects
titles
widgetKeysTaken

Constructors