[Interest] QtLocation MapPolyLine and MouseArea

Paolo Angelelli paolo.angelelli at qt.io
Fri Mar 8 11:07:27 CET 2019


Pressed/released should work as expected, shouldn't it?

Hovered is a different story though.

On Thu, 07 Mar 2019 18:32:35 +0100
maitai <maitai at virtual-winds.org> wrote:

> Hi,
> 
> I need to trigger various actions whenever a MapPolyLine is hovered or 
> pressed, such as displaying a tooltip, a menu, etc.
> 
> I have put a MouseArea on it with anchors.fills: parent, but the problem 
> is that the mouse area does not represent the line, but the polygon made 
> by the line. For instance if you have a L shape, entered event and so on 
> is triggered when you enter the bounding rectangle of the line, not when 
> you hover over the line itself.
> 
> On a QGraphicsScene we had the shape() protected method for that kinds 
> of case, for instance with a QPainterPathStroker to give some thickness 
> to the line's "mousearea".
> 
> I will probably end with a custom property that will carry the pixel 
> distance between the line segments and the mouse coordinates, but this 
> is going to be heavy to compute (I have potentially hundreds of 
> complicated lines on the map).
> 
> Is there a better way or even better a standard way to do that?
> 
> Thanks
> Philippe Lelong
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