Re: [MacPerl] Popmenus...

[ajf@afco.demon.co.uk (Alan Fry)]

Luca Jovine writes Sun, 2 Aug 1998 11:56:27 +0100 (BST):

>There are two things I would like to know how to implement, a serious one
>(1) and a not-so-crucial one (2):
>
>(1) I would like to build a window which includes several popup menus
>    (each including the same list of items) and, next to each of them,
>    a text edit box where the user can enter a numerical value that has
>    to be associated to the item picked from the corresponding popup
>    menu.
>
>    For example, each popup menu might display: chemical A
>                                                chemical B
>                                                chemical C
>                                                chemical D
>                                                ...
>                                                etc.

You can create a new menu (with an ID 2048) like this:

        use Mac::Menus;
        $m1 = MacMenu->new(2048, 'TITLE');
        $m1->add_item('chemical A', \&handler);
        $m1->add_item('chemical B', \&handler);

which can be inserted into the menu bar by '$m1->insert'.

To make the menu into a _popup_ (with Controls.pm) I believe you should do
the following:

        $c = $win->new_control( # where $win is the MacWindow handle
                 $c_r,
                 'TITLE',
                 1,
                 popupVariableWidth,
                 2048,
                 $offset,
                 popupMenuProc
        );

The position of the the popup is defined by the rect $c_r (created by
Rect->new()). Its left end determines the start of the title string and its
right end determines the end of the popup. The start of the popup is
determined by $offset. The vertical position of the popup is determined by
the bottom of $c_r.

The third parameter is set to 1 for visible 0 for hidden.

The fourth parameter is one of a selection given in the Menus.pm pod.

The fifth parameter is the ID of the menu, 2048 in this example.

The sixth parameter is the MacOS "popupMenuProc".

However as far as I can see this does not actually work. If the above is
preceeded by a statement '$m1->insert', The menu appears in the menu bar
and also as a (dysfunctional) popup in the window. It seems (unless I am on
the wrong track here) that something is broken.

You might as an alternative make a list using Lists.pm. An item in the list
can be 'selected' and the selection used in much the same way as a menu
selection.

        use Mac::Lists;
        $list= $win->new_list(
            Rect->new(10, 10, 210, 110), #rectangle around the list
            Rect->new(0, 0, 1, scalar(@list_of_chemicals)),
            Point->new(200, 20),
            0,
            1,
            1);

        foreach (@list_of_chemicals) { #('chemical A', 'chemical B',...)
            $list->set(0, $n, $_);
            $n++
        }

        $list->list->selFlags(  #prevent multiple and null selections
            $list->list->selFlags | lNoExtend |lOnlyOne |lNoNilHilite
        );

>(2) How do I create a window which automatically disappears after 3
>    seconds, or after the user clicks anywhere in it (that is, a typical
>    "About" window of a Mac program)?

You could do something like this:

        $start = TickCount();
        ...
        $win->sethook('click', sub { $OK = 1 });
        ...

        while($win->window and !$OK) {
            if(TickCount > $start + 180) { $OK = 1 }
            WaitNextEvent
        }

I hope this is some help,

Alan Fry



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