ITT Rule IDL Version 7.0 Manual de usuario descargar pdf (Pagina 366)

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366 Chapter 15: Creating a Custom iTool Widget Interface

Example: a Custom iTool Interface iTool Developer’s Guide

; Destroy the widget.

'WIDGET_KILL_REQUEST': BEGIN

; Get the shutdown service and call DoAction.

; This code must be here, and not in the _cleanup routine,

; because the tool may not actually be killed. (For example

; the user may be asked if they want to save, and they may

; hit "Cancel" instead.)

IF OBJ_VALID((*pState).oUI) THEN BEGIN

oTool = (*pState).oUI->GetTool()

oShutdown = oTool->GetService('SHUTDOWN')

void=(*pState).oUI->DoAction(oShutdown->getFullIdentifier())

ENDIF

END

; Focus change.

'WIDGET_KBRD_FOCUS': BEGIN

; If the iTool is gaining the focus, Get the set current tool

; service and call DoAction.

IF (event.enter && OBJ_VALID((*pState).oUI)) THEN BEGIN

oTool = (*pState).oUI->GetTool()

oSetCurrent = oTool->GetService('SET_AS_CURRENT_TOOL')

void = oTool->DoAction(oSetCurrent->GetFullIdentifier())

ENDIF

END

; The top-level base was resized.

'WIDGET_BASE': BEGIN

; Compute the size change of the base relative to

; its cached former size.

WIDGET_CONTROL, event.top, TLB_GET_SIZE = newSize

deltaW = newSize[0] - (*pState).basesize[0]

deltaH = newSize[1] - (*pState).basesize[1]

example2_wdtool_resize, pState, deltaW, deltaH

END

ELSE: ; Do nothing

ENDCASE

END

Discussion

Two of the three events handled in this routine are discussed in earlier sections of this

chapter. See “Handling Resize Events” on page 354 for details on the

WIDGET_BASE event and “Handling Shutdown Events” on page 356 for details on

the WIDGET_KILL_REQUEST event.

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