/C/Qgraphicsscene save all items to file

Qgraphicsscene save all items to file

QVariant item_to_variant(QGraphicsItem* item) {
  QVariantHash data;
  //save all needed attributes
  data["pos"] = item->pos();
  data["rotation"] = item->rotation();
  if(QGraphicsPixmapItem* pixmap_item = dynamic_cast<QGraphicsPixmapItem*>(item)) {
    data["type"] = "pixmap";
    data["pixmap"] = pixmap_item->pixmap();
  } else { /*...*/ }
 //...
  return data;
}

QGraphicsItem* item_from_variant(QVariant v) {
  QVariantHash data = v.toHash();
  QGraphicsItem* result;
  if (data["type"].toString() == "pixmap") {
    result = new QGraphicsPixmapItem();
    result->setPixmap(data["pixmap"].value<QPixmap>());
  } else { /*...*/ }
  result->setPos(data["pos"].toPointf());
  result->setRotation(data["rotation"].toDouble());
  //...
  return result;
}

void save_state() {
  QVariantList data_list;
  foreach(QGraphicsItem* item, items_list) {
    data_list << item_to_variant(item);
  }
  QSettings settings;
  settings.setValue("items", data_list);
}

void restore_state() {
  QSettings settings;
  foreach(QVariant data, settings.value("items").toList()) {
    QGraphicsItem* item = item_from_variant(data);
    scene->addItem(item);
    items_list << item;
  }

}

Source: stackoverflow.com

Similar codes

0 vote348 views2 answers
Man strstr
C
0 vote347 views1 answer
Srand time null
C
1 vote328 views1 answer
Does strcat null terminate
C
37 votes404 views2 answers
How to && in a while loop on c
C
0 vote328 views1 answer
Scanf ignore new line
C
6 votes321 views2 answers
How to remove button decoration
C
0 vote314 views1 answer
Insse suprafata arabila pe ani
C
0 vote356 views1 answer
What is clrsce in C
C
0 vote328 views1 answer
'Process: 12142 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)'
C
0 vote314 views1 answer
Uri/beecrowd problem no - 1131 solution in C
C