Hi,
this is probably related to
http://trolltech.com/developer/task-tracker/index_html?method=entry&id=215908,
but I though I'd give additional information about this.
I have VertexItems (based on QGraphicsItem) and PolygonItems (based on
QGraphicsPolygonItem). PolygonItems should have VertexItems as children,
so when I move a polygon it's vertices would also move.
I'm setting up the PolygonItem from my own Polygon class like this:
public void setMyPolygon(Polygon poly) {
this.polygon = poly;
this.color = new QColor(poly.getColor().getRed(),
poly.getColor().getGreen(), poly.getColor().getBlue(),
poly.getColor().getAlpha());
setBrush(new QBrush(color));
setPen(VertexItem.blackPen);
// Create the Qt polygon
QPolygonF qPoly = new QPolygonF();
// Add the vertices
for (Vertex v : poly.getVertices()) {
qPoly.add(v.position.x, v.position.y);
// Add them as children VertexItems
VertexItem vItem = new VertexItem(v);
vItem.setParentItem(this); ///// <--- CRASHES HERE!
}
setPolygon(qPoly);
}
The line vItem.setParentItem(this) causes the crash. That occurs only
when either VertexItem and/or PolygonItem have overridden itemChange().
Even when I just supply the default implementation, it will crash. For
example, on VertexItem:
@Override
public Object itemChange(GraphicsItemChange change, Object value) {
return super.itemChange(change, value);
}
So the bottom line is, itemChange() can be overridden when the items are
not in any kind of parent/child relationship.
Unfortunately, I cannot continue my project too far without this being
fixed. :( Hopefully you get it resolved for the next Qt Jambi update. Is
there any work arounds for this? I'd really need to know when the
Vertex/Polygon item positions change..
Anyways, thanks for the great work on Qt + Qt Jambi! :)
--
Mika
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