This needed a bit of refactoring of the ChartItem code, because
we have to be signaled on drag start. Currently only one handle
can be selected at a time. This was (implicitly) the case anyway,
as far as I can tell.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This was very painful, because I had to implement rearranging the
paint order of the QSGNodes. The resulting code appears quite
brittle. Let's see where that brings us.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Move most of the QtQuick code to its own directory, so that it
can be reused in the future for the chart.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>