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如何在qsnode中添加新节点

qml qt

L.V.A · 技术社区 · 6 年前

我有一个 QQuickItem 它为文本编辑器显示文本光标,首先我只有一个光标( QSGGeometry QOpacityNode . 当我增加光标的数量时,新的光标被放置在opacity节点中,但是调用 QSGNode.appendChildNode() 将军 分段故障

QSGNode * CursorsArea::updatePaintNode(QSGNode *, QQuickItem::UpdatePaintNodeData *){

if (node == nullptr) {
    node = new QSGOpacityNode;
}

if (!alpha.update()) {
    if (alpha.currentAlpha >= 1.0) {
        alpha.setCurrentAlpha(0.0);
    }
    else {
        alpha.setCurrentAlpha(1.0);
    }
}

if (editor == nullptr) {
    return node;
}

if (node->childCount() != editor->selectionsCount()) {

    if (node->childCount() < editor->selectionsCount()) {
        for (int i = node->childCount(); i < editor->selectionsCount();
             i++) {
            auto * geometryNode = new QSGGeometryNode;
            auto * geometry =
              new QSGGeometry{QSGGeometry::defaultAttributes_Point2D(), 2};

            geometry->setLineWidth(m_cursorW);
            geometry->setDrawingMode(QSGGeometry::DrawLines);
            geometryNode->setGeometry(geometry);
            geometryNode->setFlag(QSGNode::OwnsGeometry);
            node->appendChildNode(geometryNode); // Segmentation fault here
        }
    }
    else {
        while (editor->selectionsCount() < node->childCount()) {
            node->removeChildNode(node->firstChild());
        }
    }
}
}

堆栈跟踪:

qsgbatchrender::节点*)0x7ffff1248245 2 QFlags)0x7ffff124b592 3个 QFlags公司)
0x7ffff1235b18 4 qsnode::markDirty(QFlags) 0x7ffff1235b99 5 icL::编辑器::光标区域::更新点输入节点
光标区域.cpp 91 0x7fffd1124939 6
0x7ffff12d7320 7 QQuickWindowPrivate::updateDirtyNodes()
0x7ffff12d7794 8 QQuickWindowPrivate::syncSceneGraph()

0x7ffff12665b3 10 QQuickWindow::事件(QEvent*)
0x7ffff12e3b06 11 QApplicationPrivate::通知帮助程序(QObject*, 12 QApplication::通知(QObject*,QEvent*)
0x7ffff7ac86e113 QCoreApplication::通知内部2(QObject*, QEvent*)
0x7ffff020ec39 14 QWindowPrivate::deliverUpdateRequest()

0x7ffff0c65d8b 16 QQuickWindow::事件(QEvent*)
QEvent*)0x7ffff7ac0e14 18 QApplication::通知(QObject*,QEvent*)
QEvent*)
0x7ffff020ec39 20个QTimerInfoList::激活定时器()

0x7ffff0261c5a 22 g_主上下文调度
0x7fffef92d3cf 23英寸??

0x7fffef92efce 25个 QEventDispatcherGlib::处理事件(QFlags) 0x7ffff0261fc9 26??
QEventLoop::exec(QFlags)
0x7ffff020d8cc 28 QCoreApplication::exec()
0x7FF0215BC6 29主
主.cpp