Subject:
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Re: dragNdrop (Was: Ldglite must be faster)
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Newsgroups:
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lugnet.cad
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Date:
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Sat, 7 Sep 2002 16:01:05 GMT
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Viewed:
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1216 times
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"Don Heyse" <dheyse@hotmail.spam.go.away.com> skrev i meddelandet
news:H218Ln.8Hn@lugnet.com...
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> Anyhow, I was wondering what's in those two WM_COPYDATA messages
> from LDList.
If you read Pascal, take a look at the LDList source, it is both source and
sink for the D&D of LDRAW parts that I (and Steve) defined. Otherwise I have
to dig out the old mails exchanged between me and Steve - there's never been
a complete writeup of the 'protocol', it just evolved...
> Is there some reason why LDList uses that instead of WM_DROPFILES?
For simplicity's sake. A WM_COPYDATA message was very simple to program, no
need for me to read up on COM D&D, which I had never done at the time (and I
still think it's *real* overkill for sending a little text between two
applications).
Also, a side track of LDList, that's never been utilized, is the possibility
to limit your pieces to a certain 'set', decrementing the count when you
drag a piece out of LDList, incrementing again if the editor program sends
the right message back.
The important thing with using messages of our own, is that you don't *have*
to physically drag something with the mouse, and drop somewhere else. The
messages may be generated in any way (for example by the 'delete' button in
the editor).
--
Anders Isaksson, Sweden
BlockCAD: http://user.tninet.se/~hbh828t/proglego.htm
Gallery: http://user.tninet.se/~hbh828t/gallery/index.htm
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Message has 2 Replies:
 | | Re: dragNdrop (Was: Ldglite must be faster)
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| (...) I examined the source (aren't you glad you posted it) and now I can drag in a part from LDList (cool!), but I'm still not sure about the rest of the 'protocol'. What's the point of the X and Y coordinates? And is it the empty message that (...) (22 years ago, 9-Sep-02, to lugnet.cad, lugnet.cad.dev)
| | | Re: dragNdrop (Was: Ldglite must be faster)
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| Happy day... inspired, I learned how to implement window drag & drop in BrickDraw3D, and made part list and part viewer windows send each other a string (part id). Still no dragging into a model, but, it's a start. For the curious, I made (...) (22 years ago, 10-Sep-02, to lugnet.cad)
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Message is in Reply To:
| | dragNdrop (Was: Ldglite must be faster)
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| (...) Let me clarify this. I think I have drag-N-drop from Windows Explorer under control. That uses WM_DROPFILES messages and the protocol is described on the internet. I'll have to see what I can do when someone drags a whole list of part files (...) (22 years ago, 6-Sep-02, to lugnet.cad)
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