Devin Asay wrote:
> I had mistakenly assumed that if a field was hidden a snapshot of
> the field would not show that field, but what was behind it. The
> dictionary entry for import snapshot is not as clear as is could
> be, but with a little trial and error I came up with this:
>
> on dragStart
> set the allowableDragActions to "copy"
> set the dragAction to "copy"
> set the dragData["private"] to word 2 of the clickLIne
> put the clicktext into tText
> put tText into fld "dragFld"
> set the width of fld "dragFld" to the formattedWidth of fld
> "dragFld"
> lock screen
> import snapshot from (the long id of fld "dragFld" of this cd)
> set the name of last image of this card to "dragImg"
> hide img "dragImg"
> unlock screen
> set the dragImage to the id of img "dragImg"
> end dragStart
With the rendering enhancements in v2.7 the engine now supports
exporting any object to a snapshop - even ones that aren't on the
current card, things that are offscreen, hidden objects, etc. With the
"from <object>" form as you're using the engine renders the object into
the buffer from scratch rather than grab its rect from the current
window buffer, which makes your use and a great many others possible
(even easy <g>).
BUT -
Unfortunately the dragImage property is not yet supported on Linux:
<http://quality.runrev.com/qacenter/show_bug.cgi?id=9386>
So if you need a truly cross-platform solution you'll have to do what
RunRev did when they first wrote their IDE (which predates the dragImage
property): put your image into a new temporary translucent stack,
tracking the mouse to move it and doing your own hit-testing to monitor
when you should show your drop hilite.
Ugly, but until we get dragImage for Linux I know of no other way....
--
Richard Gaskin
Fourth World
LiveCode training and consulting: http://www.fourthworld.com
Webzine for LiveCode developers: http://www.LiveCodeJournal.com
LiveCode Journal blog: http://LiveCodejournal.com/blog.irv
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