accessing a parameter value upon screen change

[DaveC426913]

The same buttons on screenA, screenB and screenC are going to call screenD. screenD needs to know which screen to go back to once it's closed.

My intent is to pass the calling screen's name in as a parameter i.e. give each screen's 'Touch: Action Type:Screen' a custom parameter 'calling_screen:scrA'.


So:
screenA > btnGO > Action: Screen > Parameters > calling_screen (custom param): screenA
screenB > btnGO > Action: Screen > Parameters > calling_screen (custom param): screenB
screenC > btnGO > Action: Screen > Parameters > calling_screen (custom param): screenC

The question is, how can screenD access this parameter?

screenD > btnRETURN > Action: Screen > Parameters > Screen : calling_screen

Or is there a better way to do this?

I had a method where the two screens set and got an app-level variable but there's got to be a way to access that parameter directly. Alternately, I could do it using Lua, but that too seems like overkill.

[jason]

Hi Dave,

Sorry for the slow response. This post didn't seem to trigger the notification email that we all usually get.

You'll have to use Lua in this case to keep track of your previous screen. You can simply call a Lua function to do the screen change and record the value for "mapargs.context_screen".

You can see and example of how to do a screen change from Lua here
http://cranksoftware.com/forums/viewtopic.php?f=6&t=23

Regards,
Jason

[jason]

Upon further reflection you could also create a text variable and on the event to cause the screen change also add a data change action that sets the variable to the current screen name. Then on your close button set the screen name for the action to your "previous_screen" variable.

[joy]

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