328 Chapter 14: Creating a User Interface Panel
Example: A Simple UI Panel iTool Developer’s Guide
oSel = state.oTool->GetSelectedItems()
oSel = oSel[0]
; If the last item selected is not a visualization,
; desensitize the "Hide/Show" and "Rotate" buttons.
IF (~OBJ_ISA(oSel, 'IDLITVISUALIZATION')) THEN BEGIN
WIDGET_CONTROL, state.wHide, SENSITIVE = 0
WIDGET_CONTROL, state.wRotate, SENSITIVE = 0
ENDIF ELSE BEGIN
; If the selected object is a visualization, sensitize
; the "Hide/Show" and "Rotate" buttons.
WIDGET_CONTROL, state.wHide, SENSITIVE = 1
WIDGET_CONTROL, state.wRotate, SENSITIVE = 1
ENDELSE
BREAK
END
ELSE:
ENDSWITCH
END
Discussion
The example panel’s callback routine performs the following tasks:
• Uses the widget ID provided in the
wPanel argument to retrieve the widget
state structure stored in the first child widget of the panel widget.
• If the value of the
messageIn argument is either SENSITIVE or
UNSENSITIVE, change the sensitivity of the Rotate button (stored in the
wRotate field of the widget state structure) as necessary.
• If the value of the
messageIn argument is SELECTIONCHANGED, perform the
following tasks:
• Use the reference to the iTool object stored in the
oTool field of the state
structure to retrieve a reference to the last selected component. (Note that
the last object selected is stored in the first element of the returned array.)
• If the selected component is not a visualization, desensitize the
Hide/Show button.
• If the selected component is a visualization, sensitize the
Hide/Show
button.
Panel Type Specification
In order to display the Example4_panel user interface panel along with an iTool, the
following two things must happen:
