ITT Rule IDL Version 7.0 User Manual download pdf (Page 326)

326 Chapter 14: Creating a User Interface Panel

Example: A Simple UI Panel iTool Developer’s Guide

oTargets = state.oTool->GetSelectedItems(count = nTarg)

IF nTarg GT 0 THEN BEGIN

; If there are selected items, use only the last item

; selected, which is stored in the first element of

; the returned array.

oTarget = oTargets[0]

; Get the iTool identifier of the selected item.

name = oTarget->GetFullIdentifier()

; Retrieve the setting of the HIDE property.

oTarget->GetProperty, HIDE = hide

; Change the value of the HIDE property from 0 to 1

; or from 1 to 0. Use the DoSetProperty and

; CommitActions method to ensure that the change

; is entered into the undo/redo transaction buffer.

void = state.oTool->DoSetProperty(name, "HIDE", $

((hide+1) MOD 2))

state.oTool->CommitActions

ENDIF

BREAK

END

ELSE:

ENDSWITCH

; Refresh the iTool window.

state.oTool->RefreshCurrentWindow

END

Discussion

It is beyond the scope of this chapter to describe the IDL widget concepts employed

in the Example4_panel event handler; the comments in the code describe most of the

features. The following points are worth noting, however:

• If the event received by the event handler routine is generated by the

Rotate

button, the example calls the DoAction method of the IDLitUI object, with the

identifier of the

Rotate Left operation as its argument.

• If the event received by the event handler routine is generated by the

Hide/Show button, the example does the following:

• Use the reference to the iTool object stored in the state structure to retrieve

the list of selected items using the GetSelectedItems method.

• Retrieve the object identifier of the last item selected. (Note that the last

item selected is stored in the first element of the returned array.)

• Retrieve the value of the HIDE property of the selected item.

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ITT Rule IDL Version 7.0 User Manual Page 326