--- Leif W <[EMAIL PROTECTED]> wrote:
> Ok, so where do I start adding / modifying code to
> add some features like
> Drag & Snap. I'm thinking somewhere in the onmove
> event.
IMO I would recommend that the Snap functions be
placed in a file call dragsnap.js and be placed in the
api/ext directory (since it's an extension to the
dynalyer and mouse events). Use the ondragemove event
or the onmove event (invoked by motionx)
> I'll need to first make some decisions about
> functionality. Do I add
> attributes like (boolean) doSnap and (+t,+r,+b,+l)
> snapBorder to the (either
> static or dragged) dynlayer? Does the doSnap apply
> to the stationary
> (non-draggable and draggable) target objects, such
> that the draggable object
> (which is currently moving) will snap to anything
> that is snappable? Or do
> I only apply the doSnap to the currently moving
> draggable layer, such that
> it snaps to anything? Or maybe both target/source
> layers need the draggable
> boolean set?
And the a _snapEnabled property to all snap enabled
layers by using either a doSnap(), setSnap() or
enableSnap() function to the DynLayer.prototype
object. For flexiblity it's best to make both non-drag
and drag enabled layers snap-able. This way a use can
create static objects that are snap enabled. For snap
to take place the _snapEnabled property must be set to
true for the colliding layers.
> Second, how about the boundary implementation?
> Thinking something like the
> collision detection might come in handy. But how to
> set a wider boundary?
> Do I put the snappable layer inside an invisible
> "wrap" layer which is going
> to be wider, and do collision detection on that? Or
> do I simply copy and
> modify the collision code and rename it to some
> snappable code, and do
> collision detection on boundaries?
For flexibility it would be best to modify the
motionx.js file so that it supports a boundary
feature. For exmaple:
setCollideOffset(1) or
setCollideOffset({top:3,bottom:5,left:6,right:10})
I was thinking about setBoundrary but that might not
be unique as other DynLayer extensions might use it in
the future.
The above would offer maximum flexibility to the user.
The user can enter either an interger value or pass an
object with top, bottom,right,left boundrary values.
> Third, which files should I start looking in? I've
> got a copy of dynapi3x
> and have been mucking around with it.
You could the dragsnap.js modify the motionx.js (if
you're going to use it). Another file to look at would
be the dragdrop.js found in api/ext.
PS. I think this library will be of great benefit to
many users. Keep up the good work.
Best regards,
--
Raymond Irving
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