Crazy bug found and solved on Display Canvas

The Display Canvas is an experimental feature and should not be used in production … yet.
I still have need of it, so I will continue its development. You can keep track of it in this blog.

The first of these was finding a really horrific bug that only happened on the Display Canvas page.
Anyone who has gone there and clicked on one of the elements in, likely experienced it.

The result of the bug is all the cards on the AppStarterStack disappearing 😳😲😱 and being invisible in the project manager, and un-referenceable in the engine. Those are obviously horrible side effects to what was a “referencing mistake”, which the engine did not catch.
Notice the incorrect reference to “of me” as a stack …. inside the behavior of a group. “of this card of group …..”.

To correct it, please replace the “FocusThisDisplay” handler of the behavior of group “Example Canvas” of card “Display Canvas” … with the code in the block found below.

This was a scary one folks, but luckily it was found.

on FocusThisDisplayCanvas ThisCanvas
     // if ThisCanvas is specified with a name of group then focus specified
     // if not, focus "me"
     
     if ThisCanvas = empty then
          repeat with x = 1 to the number of lines of the MyDisplayCanvases of this card of defaultstack
               if line x of the MyDisplayCanvases of this card of defaultstack = the short name of me then
                    set the IAmInFocus of me to 1
               else
                    set the IAmInFocus of me to 0
               end if
          end repeat
     else
          repeat with x = 1 to the number of lines of the MyDisplayCanvases of this card of defaultstack
               if line x of the MyDisplayCanvases of this card of defaultstack = ThisCanvas then
                    set the IAmInFocus of me to 1
               else
                    set the IAmInFocus of me to 0
               end if
          end repeat
     end if
end FocusThisDisplayCanvas

AppStarterStack

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