Child view (bubble) positioning issue when map is rotated.

[osmdroid]

Child view (bubble) positioning issue when map is rotated.

[neilboyd]

The change to onLayout is a bit out of date because of the recent projection changes.

All the code in scrollTo is also missing.

Please could you supply a patch to MapView with just the changes required to fix this issue.

[MKergall]

Effectively, the change was obsolete with those changes.
I updated the fix according to osmdroid 4.2 changes.

Here is the patched MapView: https://drive.google.com/file/d/0B_8VOmRyW664WGotcmRLbjV3TDA/edit?usp=sharing

See sections marked with "ADDED" / "END".

• EDIT on 30/05 -
  Hi Neil,
  Any chance to have this fixed soon?
  I see that you are busy with Xamarin project, but integrating the patch should be pretty straightforward.

[MKergall]

Neil, Marc,
Any chance to have this fix integrated in the next version of osmdroid?
(currently, bubbles are unusable when the map is rotated - this is a big drawback)

[kurtzmarc]

Any tests on how calling onLayout on every scroll affects performance? That is the only thing that gives me pause. Actually - how are we getting away with not having to do that now?

[kurtzmarc]

Okay - we don't have to do that now because we use mercator projection (regular canvas) coordinates to set the position. I don't think calling onLayout will affect performance that much, but I'd like to confirm that before committing. This is an important patch and we should definitely fix this long-standing issue.

[kurtzmarc]

... and perhaps we should only call onLayout if the map orientation is != 0 || 180

[MKergall]

onLayout is only about positionning visible child views. It does nothing else.

Effectively, in scrollTo, we could check map orientation != 0 before calling onLayout.
For != 180, I'm not 100% sure...

[kurtzmarc]

Let me know if that works for you!

[MKergall]

It works!

[kurtzmarc]

Excellent! I will close this issue.