[Marble-devel] User interaction with data in a LayerInterface subclass
tackat at t-online.de
Wed May 9 06:06:24 UTC 2012
On Dienstag, 8. Mai 2012 21:08:18 Amit Chaudhuri wrote:
> I want to be able to interact with individual lines or nodes by hovering
> with a mouse, double clicking or selection through a menu. I want to show
> data such as a node code or a description when an item is hovered over.
Ideally the solution would be to use GeoGraphicsLineString from
marble/src/lib/geodata/graphicsitem (This should work in a similar manner to
GraphicsView), but IIRC it lacks mouse interaction so far (we'd be happy about
patches that would provide this functionality though).
For its implementation (or for your own GeoPainter based one) you need a way
to interact with the drawn line though: In order to determine whether the
linestring is "hovered" by the mouse you could use
QRegion GeoPainter::regionFromPolyline ( const GeoDataLineString &
lineString, qreal strokeWidth = 3 ) const;
which has been there for this actual purpose.
> I'd like to be able to double click and bring up a read only(?) form which
> holds anything I've chosen to store in a database table associated with the
> item. This might be notes in an html file, an image of a building, string
> or numeric data or a mixture of all of the above. I'm quite happy with the
> database side of this but I'm not sure where to start with the marble end.
> Eventually, I'll probably want to have read/write capability (hence '?'
> Can I do what I want with the LayerInterface approach? If so, how do I
> select an item? [Might I be able to use the event filter and some
> positional information to achieve this?]
> If LayerInterface won't cut it, what sort of strategy would you suggest?
> Grateful for any pointers..
> Amit (a.k.a A799679)
More information about the Marble-devel