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How to write the code - menuItemCallbacks of hiCreateSimpleMenu ?

Charley Chen

 

 Dear All ,

I want to create a simple menu(hiCreateSimleMenu) ,

which arg l_menuItems  are fixed  , //A -> B -> C

each  A -> B -> C has it shape id // db:1111 db:2222 db:3333

How to let arg l_menuItemCallbacks follows  the l_menuItems correspondence ?

e.g. 

if   choose A , it will select  db:1111

if   choose B , it will select  db:2222

if   choose C , it will select  db:3333

 

hiCreateSimpleMenu( 'test  "QQ"  list("A" "B" "C")  ????)

I don't know how to write ???  code  , How to do it ?

 

Thank you,

Charley

Parents
  • Andrew Beckett

    Fundamentally the limitation is that the callback has to be a string, and you can't represent a db object as a string (well, you can, but you can't then use that to locate the db object again, so that's not terribly helpful). It's not obvious how you are indicating to the user what the menu items are and how that relates to the db object underneath, but one solution would be to do this when you build the simple menu:

    MyGlobalItemTable=makeTable('dbLookup nil)
    foreach(mapcar obj items
        sprintf(itemText "%L" obj)
        MyGlobalItemTable[itemText]=obj
        sprintf(nil "TEST(\"%L\")" obj) ; generate callback
    );foreach

    then in your callback function, you can do:

    procedure(TEST(objString)
      realObj=MyGlobalItemTable[objString]
      ... do whatever you want here
    )

    Whatever you do, however, don't hang onto the contents of the global table for too long -  because the database ids might get invalid or recycled (e.g. if objects are deleted, or the containing cellView is purged). For the duration of a popup menu though, it's probably fine though.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Fundamentally the limitation is that the callback has to be a string, and you can't represent a db object as a string (well, you can, but you can't then use that to locate the db object again, so that's not terribly helpful). It's not obvious how you are indicating to the user what the menu items are and how that relates to the db object underneath, but one solution would be to do this when you build the simple menu:

    MyGlobalItemTable=makeTable('dbLookup nil)
    foreach(mapcar obj items
        sprintf(itemText "%L" obj)
        MyGlobalItemTable[itemText]=obj
        sprintf(nil "TEST(\"%L\")" obj) ; generate callback
    );foreach

    then in your callback function, you can do:

    procedure(TEST(objString)
      realObj=MyGlobalItemTable[objString]
      ... do whatever you want here
    )

    Whatever you do, however, don't hang onto the contents of the global table for too long -  because the database ids might get invalid or recycled (e.g. if objects are deleted, or the containing cellView is purged). For the duration of a popup menu though, it's probably fine though.

    Regards,

    Andrew.

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