clone one node as a child of current position

[Xu Wang]

Dear Leo Developer,

If I know the GNX of one node, how shall I clone it to the position under current node(as a child of current position)?

BR,Austin

[Edward K. Ream]

​On Tue, Feb 25, 2020 at 12:42 PM Xu Wang <xu4...@gmail.com> wrote:

Dear Leo Developer,

If I know the GNX of one node, how shall I clone it to the position under current node(as a child of current position)?

​Good question.

gnx's belong to vnodes, not positions. Your question is equivalent to asking, given a vnodes, how do I create the desired clone.

Most of the time it will be easier to use positions rather than vnodes. For example, here is tested code that, given a position, moves a clone of that position to the last node of c.p:

# Get the position of a node whose headline is 'Target Node'
child_p = g.findNodeAnywhere(c, 'Target Node')
assert child_p
# Clone the node.
clone = child_p.clone()
# Move the node
p = c.p
n = p.numberOfChildren()
clone.moveToNthChildOf(p, n)
# Make all children visible and redraw.
p.expand()
c.redraw()

If all you have is a gnx, then you can search for any position whose vnode has that gnx. Here is tested code.

child_p = None
for p in c.all_positions():
    if p.gnx == 'ekr.20200225134818.1': # The gnx of my target node.
        child_p = p
        break
assert child_p
clone = child_p.clone()

And then you can proceed as before:

p = c.p  # Don't use the p in the search loop!
n = p.numberOfChildren()
clone.moveToNthChildOf(p, n)
p.expand()
c.redraw()

HTH.

Edward

P.S. If performance is a big consideration, you might be able to use one of Leo's dictionaries that associates vnodes with gnx's. But I'll leave that complication for (much) later :-)

EKR

[Xu Wang]

Thanks for the detailed demo.. it's very helpful for me to getting familiar with Leo scripting.

Edward K. Ream <edre...@gmail.com> 于2020年2月26日周三 上午3:12写道：

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[Edward K. Ream]

On Thu, Feb 27, 2020 at 8:01 PM Xu Wang wrote:

Thanks for the detailed demo.. it's very helpful for me to getting familiar with Leo scripting.

You're welcome. Glad the example helped.

Edward