The code assumed that when adding chart items to lists, prev
and next are initialized to null. Make this more robust.
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>
So far, the only dragable item was the legend in the statistics
code. On the profile, we will have multiple dragable items.
Therefore, move the code up and make it more general. This
took some reorganization. Now, the size of the ChartItem
is saved in the base class. Also, setPos() became a virtual
function.
The dragable items are kept as an unsorted list.
If there will be many of them, this should be changed to
some sort of sorted list (maybe quadtree?).
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>
