28.4 Action Widgets

tkInit

tkInit(parent: +WidgetO  
       action: +Action 
       args:   +Args   <= nil  
       ...)

Initializes the widget object and creates the widget.

The field WidgetO for the special feature parent must be a tickle object. self becomes a slave of WidgetO. Action and Args are described in Section 28.2.1 and Section 28.2.2.

tk

tk(...)

Sends a command for self to the graphics engine.

tkReturn

tkReturn(... ?S)
tkReturnString(... ?S)
tkReturnAtom(... ?A)
tkReturnInt(... ?IB)
tkReturnFloat(... ?FB)
tkReturnList(... ?Ss)
tkReturnListString(... ?Ss)
tkReturnListAtom(... ?As)
tkReturnListInt(... ?IBs)
tkReturnListFloat(... ?FBs)

Sends a command for self to the graphics engine and returns the result in the field with the highest integer feature.

tkAction

tkAction(action: +Action <= unit 
         args:   +Args)

Redefines or deletes an action. Action and Args are described in Section 28.2.1 and Section 28.2.2.

tkBind

tkBind(event:  EventV 
       action: Action  <= _
       args:   Args    <= nil
       append: AppendB <= false 
       break:  BreakB  <= false)

Defines an event binding for self. Events are described in Section 5.5 of ``Window Programming in Mozart'' and Section 28.2.3.

tkClose

tkClose()

Closes the widget object and destroys the widgets and all slave widgets. Further object application of self raises an exception.