net.rim.device.api.lcdui
Class BlackBerryForm

java.lang.Object
  extended by javax.microedition.lcdui.Displayable
      extended by javax.microedition.lcdui.Screen
          extended by javax.microedition.lcdui.Form
              extended by net.rim.device.api.lcdui.BlackBerryForm
All Implemented Interfaces:
Controllable

public class BlackBerryForm
extends Form
implements Controllable

The BlackBerryForm class extends the functionality of the Form class.

The BlackBerryForm class implements Controllable and can be queried to retrieve BlackBerry-specific Controls. For instance, on devices which support a virtual keyboard, BlackBerryForm.getControl(String) can be queried to return a VirtualKeyboardControl object.

Since:
BlackBerry API 4.7.0

Constructor Summary
BlackBerryForm(String title)
          Creates a new instance of a BlackBerryForm.
BlackBerryForm(String title, Item[] items)
          Creates a new instance of a BlackBerryForm
 
Method Summary
 Control getControl(String controlType)
          Obtain the object that implements the specified Control interface.
 Control[] getControls()
          Obtain the collection of Controls from the object that implements this interface.
 
Methods inherited from class javax.microedition.lcdui.Form
append, append, append, delete, deleteAll, get, getHeight, getWidth, insert, set, setItemStateListener, size
 
Methods inherited from class javax.microedition.lcdui.Displayable
addCommand, getTicker, getTitle, isShown, removeCommand, setCommandListener, setTicker, setTitle, sizeChanged
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 



Constructor Detail

BlackBerryForm

public BlackBerryForm(String title)
Creates a new instance of a BlackBerryForm.

See Also:
Form.Form(String)
Since:
BlackBerry API 4.7.0

BlackBerryForm

public BlackBerryForm(String title,
                      Item[] items)
Creates a new instance of a BlackBerryForm

Throws:
IllegalStateException - if one of the items is already owned by another container
NullPointerException - if an element of the items array is null
See Also:
Form.Form(String, Item[])
Since:
BlackBerry API 4.7.0


Method Detail

getControls

public Control[] getControls()
Description copied from interface: Controllable
Obtain the collection of Controls from the object that implements this interface.

Since a single object can implement multiple Control interfaces, it's necessary to check each object against different Control types. For example:

Controllable controllable;
    :
Control cs[];
cs = controllable.getControls();
for (int i = 0; i < cs.length; i++) {
    if (cs[i] instanceof ControlTypeA)
        doSomethingA();
    if (cs[i] instanceof ControlTypeB)
        doSomethingB();
    // etc.
}

The list of Control objects returned will not contain any duplicates. And the list will not change over time.

If no Control is supported, a zero length array is returned.

Specified by:
getControls in interface Controllable
Returns:
the collection of Control objects.
See Also:
Controllable.getControls()
Since:
BlackBerry API 4.7.0

getControl

public Control getControl(String controlType)
Description copied from interface: Controllable
Obtain the object that implements the specified Control interface.

If the specified Control interface is not supported then null is returned.

If the Controllable supports multiple objects that implement the same specified Control interface, only one of them will be returned. To obtain all the Control's of that type, use the getControls method and check the list for the requested type.

Specified by:
getControl in interface Controllable
Parameters:
controlType - the class name of the Control. The class name should be given either as the fully-qualified name of the class; or if the package of the class is not given, the package javax.microedition.media.control is assumed.
Returns:
the object that implements the control, or null.
Throws:
IllegalArgumentException - Thrown if controlType is null.
See Also:
Controllable.getControl(String)
Since:
BlackBerry API 4.7.0





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