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Avoid copying element JSON in `ele.move()` #1459

maxkfranz opened this issue Jul 18, 2016 · 0 comments


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commented Jul 18, 2016

Issue type

Feature request

Description of new feature

When calling ele.move(), it would be nice if the original element were edited in-place instead of removing the original element and adding a modified copy.

Motivation for new feature

  • Performance: Avoid copying of element JSON.
  • Prior refs of ele are the same after a call to ele.move().
  • Because the element is not actually removed from the graph, it can be moved mid-gesture. For example, if you call ele.move() on a grabbed node, the user loses hold of the node.

@maxkfranz maxkfranz added this to the future milestone Jul 18, 2016

@maxkfranz maxkfranz self-assigned this Jan 24, 2019

@maxkfranz maxkfranz modified the milestones: future, 3.4.0 Jan 24, 2019

@maxkfranz maxkfranz changed the title Improve performance of eles.move() by avoiding copying Avoid copying element json in `ele.move()` Jan 24, 2019

@maxkfranz maxkfranz changed the title Avoid copying element json in `ele.move()` Avoid copying element JSON in `ele.move()` Jan 24, 2019

maxkfranz added a commit that referenced this issue Jan 25, 2019

Avoid copying element json in `ele.move()` #1459
- Add `addToPool` and `removeFromPool` options (for private use only) to `eles.restore()` and `eles.remove()`.  The signature is now like this: `ele.remove(notifyRenderer, removeFromPool)`, so calls with `(false, false)` arguments allow all of the remove and restore cleanup to be applied to elements that aren't actually removed from the graph --- and without notifying the renderer or emitting `remove` or `restore` events.
- This new internal feature allows for `eles.move()` to modify existing elements in-place rather than creating modified copies.
- Batching is used to avoid redundant style updates as a remove-restore pair would normally do.
- Add a `move` event for when `ele.move()` is called.
- Update the z-order sorting in the base renderer when a `move` notification is received.  This only need to happen in compound graphs. because moving edges does not influence the z-ordering.
- Update docs for `eles.move().
- Add docs for `move` event.
- Aside: Remove redundant collection creation within `remove()`.
- Aside: Clean up z-ordering code a bit in the base renderer.
- Aside: When removing parent=>child ref in `remove()`, the child=>parent ref should also be removed.

@maxkfranz maxkfranz closed this Jan 25, 2019

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