Subject:
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LDList Documentation (Was: LDD vs LDraw)
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 20 Dec 2006 15:16:34 GMT
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Viewed:
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2678 times
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Ah ha, it looks like all I missed was the return(1) to let LDList
know the ldglite window accept drops.
Since it seems to work now, I’d like to gather the scattered
LDList documentation here and retitle this part of the thread so I
can find it again.
First some Ideas and bugs:
It might be nice to be able to disable LDList as a part drop target, or
at least disable the part count decrementor for dropping in ldlist.
I’ve noticed that once you’ve dragged a part into the ldlist window ( or
any other drop target like ldglite), you can also decrement the part
count simply by clicking on a part name. That’s too easy to do by
mistake, so I suspect it’s a bug in ldlist.
It might also be nice if LDList could get the ldrawdir from the ldraw.ini
file if the environment variable isn’t set.
And while I’m at it, I wonder if we couldn’t use a simple drop target
program that could be used to *generate* the part list files. Maybe
modify LDList so you could run 2 copies, one with the entire part list
as a drag source, and one with a part list as a drag target. Then
increment the part count when you drop a part into the target, and
allow saving the set list when you’re done.
Or hmmm, I’ve got all the goodies in the ldglite sources except for
saving a .set file. Plus, I could probably steal the peeron importer
code to generate .set lists from there as well. Double hmmm...
Now for the LDList documentation (gathered from lugnet posts).
Working with custom set/part lists:
The LDList program has the beginnings of this functionality, you can
load a set list and only see the parts in that set, and the number of
parts remaining, but it does not keep track of different colours.
Using LDList with MLCAD:
Unfortunately MLCad doesn’t support Drag&Drop from LDList, so the best you
can do is like this:
Get LDList.
Create a set list for your set (xyz.set). A set list is just a text file
with one line for each part:
Start LDList and load the set. Now you will only see the parts from the set,
and the number available.
Start building in MLCad, but remember that each time you fetch a new part,
you should also go to LDList and drag the same part from the text list to
the graphical view (of LDList). The count will go down.
Using LDList with ldglite:
Ldglite works with LDList in two ways. You can launch LDList and ldglite
independently. Then load a set into LDList or work from the main part list.
Put ldglite into edit mode and drag parts from LDList into ldglite. The
parts will be inserted into the model in ldglite, and if working on a custom
set in LDList, the part count will decrement.
LDList can also be installed as a plugin in ldglite. To install it,
copy the LDList executable into the plugins subdirectory for ldglite.
Make sure to run LDList from there at least once to generate the main
part list, or just copy a previously generated part list (ldrawlist.txt)
into the plugins directory. Then you can launch LDList from the ldglite
plugins menu (keyboard shortcut /ep ldlist).
LDList Drag and Drop Protocol:
I capture the mouse on a drag operation in LDLIST, and send the following
message to each window the cursor passes (once every time the underlying
window changes):
(* cds is a WM_COPYDATA structure *)
cds.dwData := 0;
cds.cbData := 0;
cds.lpData := nil;
Response := SendMessage(h, WM_COPYDATA, Handle, longint(@cds));
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and I expect a Response = 1 if the window accepts drops, 0 otherwise
(default if the message itself is not handled). In Delphi this is achieved
by setting Message.Result := 1; before exiting the message routine.
This is used to change the dragging cursor.
When a drop is performed, I send the following message:
cds.dwData := 1;
cds.cbData := SizeOf(CopyRecord);
cds.lpData := @CopyRecord;
SendMessage(h, WM_COPYDATA, Handle, longint(@cds));
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If you want, you can acknowledge the drop in the same way as above (or
perhaps an error number if the sent string doesn’t make any sense to your
program), but as you see, for the moment I ignore the return code.
The CopyRecord is defined as:
type
TCopyRecord = record
X, Y: integer;
(* this means 32-bit integers *)
s: packed array[0..255] of char;
(* This one is filled with a null-terminated string *)
end;
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The record and CopyDataStruct that you receive in the message is filled and
sent in the following way:
CopyRecord.X := p.X;
CopyRecord.Y := p.Y;
StrPLCopy(CopyRecord.s, TheString, SizeOf(CopyRecord.s));
(* Making a null-terminated string, guaranteed not to overflow *)
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The X and Y are screen coordinates, it’s up to the receiver to convert to
window coordinates for the receiving window.
The string is of the format “6060.DAT Arch 1 x 6 x 3 & 1/3 with Curved
Top” (i.e. it looks exactly like the status panel in LDList). It’s up to the
receiver to find this part in the LDRAW search hierarchy.
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Message is in Reply To:
 | | Re: LDD vs LDraw
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| (...) I think this excerpt from a mail between me and someone else is the only written documentation: -8<---...--- BEGIN ---...--- I capture the mouse on a drag operation in LDLIST, and sends the following message to each window the cursor passes (...) (18 years ago, 14-Dec-06, to lugnet.cad)
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