/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 vote311 views1 answer
#include<stdio.h> main() { int *p = 15; printf("%d",*p); }
C
27 votes346 views4 answers
String to int c
C
0 vote316 views2 answers
Matrix multiplication in c
C
13 votes293 views2 answers
Python driver.get
C
10 votes297 views4 answers
Install redis
C
4 votes303 views6 answers
Javascript string
C
6 votes327 views3 answers
MongoDb update
C
45 votes327 views3 answers
String concatenation in c
C
1 vote306 views2 answers
Fgfgfgfgfgfgheheheheheh
C
0 vote308 views1 answer
Difference between signed apk and unsigned apk
C