Listbox Help

BlitzMax Forums/MaxGUI Module/Listbox Help

moravcik

(Posted 2007) [#1]

Hi. Finally got around to having enough time to give BMax a shot, despite owning it since release. I'm trying to create a listbox that is linked to a list of objects. I notice that there is an 'extra' object field in the AddGadgetItem command. Can I use this to store a pointer to the connected object in my list of objects, and if so, how can I retrieve that pointer when I select one of the items in my listbox?

Hope this makes sense.

TIA.

jsp	(Posted 2007) [#2]

Store your object with the AddGadgetItem command and to get it back you have to cast it:
Value:MyObject = MyObject( GadgetItemExtra:Object( gadget:TGadget , index ) )

Perturbatio

(Posted 2007) [#3]

As the docs say, EventExtra() returns the extra data

Global win:TGadget = CreateWindow("test", 10, 10, 250,200)
Global Quit:Int = False
Global listbox:TGadget = CreateListBox(4,4,100,80,win)

AddGadgetItem listbox,"One"
AddGadgetItem listbox,"Two",False,-1,ETIP
AddGadgetItem listbox,"Three",False,-1,"tip - goes here","mystringobject"

While Not Quit
	WaitEvent()

	Select CurrentEvent.ID
		Case EVENT_GADGETSELECT
			If EventSource()=listbox
				Print String(EventExtra())

		Case EVENT_WINDOWCLOSE
			If CurrentEvent.Source = win Then Quit = True
	EndSelect

Wend
End

moravcik

(Posted 2007) [#4]

Thanks guys. Much appreciated.