IWorkArea Interface

The IWorkArea interface is the common base of all interfaces used for implementing windows.

Purpose

The IWorkArea interface is the common base of all interfaces used for implementing windows. The interface's properties and methods are used for sending messages from the framework to the window and for reading window data through the framework.

IWorkArea.MessageHandler

          void MessageHandler(WindowMessage)

MessageHandler is a method which processes messages from the framework to the plug-in, as with IApplicationComponent.RequestHandler. The following table gives an overview of the most important events and messages sent to the window when the events appear.

Message Type	Event	See
Activated	The window was activated.	Element window (Sample 2)
Deactivated	The window was deactivated.
Closing	The window is closed.	Element window (Sample 2)
SelectionChanged	The selection was changed.	Selection
Refresh	Model elements were modified.	Refresh Windows
SwitchRole	The role or administrator login has changed.
Unlocking	Model elements are being unlocked.	Element window (Sample 2)

IWorkArea.Selection and IWorkArea.SelectionPropagation

          ElementSet Selection { get; set; }
SelectionType SelectionPropagation { get; }

Both of these properties regulate the behavior of the window regarding the selection. You can find more information about this in the following sections.

IWorkArea.CanExeCmd and IWorkArea.ExecuteCmd

          bool CanExeCmd(object, CanExecuteRoutedEventArgs)
bool ExecuteCmd(object, ExecutedRoutedEventArgs)

Both of these methods have the same functions as they also have in the ICommandDispatchable interface.

Attention:

A window can only process commands if it is active, i.e. is in the input focus.The dispatcher methods for all inactive windows are not called when a command is executed.