[REBOL] Re: Accessing layout styles.
From: agem:crosswinds at: 10-Jul-2001 3:37
RE: [REBOL] Re: Accessing layout styles.
[brett--codeconscious--com] wrote:
> Hi Carl,
>
> > How do you get at the styles in a layout without the use of variables?
>
> When layout is finished you are left with an object that contains other
> objects. These are face objects - they are no longer styles exactly. You can
> traverse tree using the PANE field of the face. PANE can be none! or an
> object! or a block!
>
> For example:
>
> my-layout: layout [title "the title" field "some text"]
> type? my-layout/pane
> length? my-layout/pane
> print mold get in second my-layout/pane 'text
>
> But this will not help you for what you want.
>
> > I want to be able to open any number of new windows from a main
> > window and have the new ones behave independently. Umm, this is what
> > I mean...
> >
my-window!: context[
f: t: none
view-me: does[
> > view layout [
> > f: field "a"
> > button "open" [
> > view/new layout [
> > t: text 100 copy f/text
> > button "Change" [t/text: "changed!" show t]
> > ]
> > ]
> > ]
]
]
make my-window! [view-me]
and each has its own 'f and 't .
> >
> > but the use of a variable there ('t) means the text in each new window
> > is sharing the same variable and so only the most recent window
> > opened can have its text changed. I need to get rid of that variable
> > and get at the layout styles directly. I assume
>
> Actually you probably don't need to get at the styles directly. What you
> need is effectively a different variable for each new layout something
> CONTEXT (object!) is good at. In the script below, when the button is
> activated, an object is created with
> two fields one contains the result of the LAYOUT function and the other a
> reference to the TEXT. I add these objects
> to a block. Therefore you can access them at a later time.
>
> layout-contexts: copy []
> view layout [
> f: field "a"
> button "open" [
> lo-ctx: context [
> t: none ; reserves a spot for t in the context
> lo: layout [
> t: text 100 copy f/text
> button "Change" [t/text: "changed!" show t]
> ]
> ]
> append layout-contexts lo-ctx
> view/new lo-ctx/lo
> ]
> ]
>
> BTW, now you can do:
>
> foreach ctx layout-contexts [print mold ctx/t]
>
> HTH!
> Brett
>
-Volker
