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Thread: How can I traverse all of the items in a QStandardItemModel

  1. 23rd August 2008, 09:28 #1
    patrik08
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    Default How can I traverse all of the items in a QStandardItemModel

    I need a model tree to save PDF Bookmark like QStandardItemModel
    and this model must combine on anchorNames () on a QTextDocument

    i need a model to validate anchorNames () at QTextDocument .....

    at end i save the tree on this way:
    Qt Code: 
    1. <fo:bookmark-tree>
    2.           <fo:bookmark internal-destination="sec0" >
    3.                <fo:bookmark-title>Internal dest.0</fo:bookmark-title>
    4.                <fo:bookmark internal-destination="sec1" >
    5.                     <fo:bookmark-title>Internal dest.1</fo:bookmark-title>
    6.                </fo:bookmark>
    7.                <fo:bookmark internal-destination="sec2" >
    8.                     <fo:bookmark-title>Internal dest.2</fo:bookmark-title>
    9.                </fo:bookmark>
    10.           </fo:bookmark>
    11.      </fo:bookmark-tree>
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    I search a way to traverse or iterate all node from model
    i find only this here ...

    http://troll.no/developer/knowledgeb...ndarditemmodel

    Is here other way?


    on read xml-bookmark i make it so...

    Qt Code: 
    1. void BookMarkModelRead::openRootBookmark( const QDomElement e )
    2. {
    3.     if (e.tagName() !="fo:bookmark-tree")
    4.     {
    5.         return;
    6.     }
    7.     foundTree = true;
    8.     model = new QStandardItemModel();
    9.     internalLinkFound.clear();
    10.     setHeader();
    11.     //////////////qDebug() << "### openRootBookmark -> " << e.tagName();
    12.     QDomElement child = e.firstChildElement("fo:bookmark");
    13.            while (!child.isNull()) {
    14.                 model->invisibleRootItem()->appendRow(Compose(child,0));
    15.                 child = child.nextSiblingElement("fo:bookmark");
    16.            }
    17. }
    18.  
    19. QList<QStandardItem *> BookMarkModelRead::Compose( const QDomElement e , const int leveldeep )
    20. {
    21.     Q_ASSERT ( e.tagName() == "fo:bookmark" );
    22.     treeLoop++;
    23.     QList<QStandardItem *> diritto;
    24.     QIcon icob = createBookColorIcon( Qt::darkRed );
    25.     QString txt = e.firstChildElement("fo:bookmark-title").text();
    26.     if (txt.size() < 2) {
    27.         txt = tr("No Title found!");
    28.         icob = createBookColorIcon( Qt::red );
    29.     }
    30.     const QString link = e.attribute("internal-destination","null");
    31.     internalLinkFound.append(link);
    32.     qDebug() << "### read -> " << txt <<  "-" << treeLoop;
    33.  
    34.                     QStandardItem *item0 = new QStandardItem(txt);
    35.                     item0->setData(leveldeep,Qt::UserRole);
    36.                     item0->setData(bold_base_font,Qt::FontRole);
    37.                     item0->setIcon ( icob );
    38.                     item0->setFlags( flags );
    39.  
    40.                     diritto.append(item0);
    41.  
    42.                     QStandardItem *item1 = new QStandardItem(link);
    43.                     item1->setFlags( flags );
    44.                     item1->setData(leveldeep,Qt::UserRole);
    45.  
    46.                     diritto.append(item1);
    47.  
    48.                     QStandardItem *item2 = new QStandardItem(QString("%1").arg(leveldeep));
    49.                     item2->setFlags( Qt::ItemIsEnabled );
    50.                     item2->setData(leveldeep,Qt::UserRole);
    51.  
    52.                     diritto.append(item2);
    53.  
    54.     if (!e.firstChildElement("fo:bookmark").isNull() && leveldeep == 0 ) {
    55.         /* one level deep down child */
    56.          QDomElement child = e.firstChildElement("fo:bookmark");
    57.            while (!child.isNull()) {
    58.                        if ( child.tagName()  == "fo:bookmark") {
    59.                               const QString nextlink = child.attribute("internal-destination","null");
    60.                               if (!internalLinkFound.contains(nextlink)) {
    61.                               diritto.first()->appendRow(Compose(child,leveldeep + 1));
    62.                               }
    63.                         }
    64.  
    65.                child = child.nextSiblingElement();
    66.            }
    67.     } else if (!e.nextSiblingElement("fo:bookmark").isNull() && leveldeep > 0 ) {
    68.         /*  same level is only next on deep */
    69.  
    70.     }
    71.     return diritto;
    72. }
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    and to read the model it is not possibel?
    i can not use QTreeWidget / QTreeWidgetItem why ... i can not set a model at him...
    only QTreeView can set a model .... i know only a way to use sqlite3 as model...
    Must i use sqlite3 to traverse all tree? QStandardItemModel can not make this job..

    the resut... is not possible to read back from QTreeView ...!! onewayQTreeView :-(

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  2. 24th August 2008, 01:01 #2
    jacek
    jacek is offline Guru
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    Default Re: How can I traverse all of the items in a QStandardItemModel

    Pseudo code:
    Qt Code: 
    1. for i = rowCount() - 1 to 0:
    2.    push index( i, 0 )
    3. while stack not empty:
    4.    pop idx from stack
    5.    process idx
    6.    if hasChildren( idx ):
    7.       for i = rowCount( idx ) - 1 to 0:
    8.          push index( i, 0, idx )
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    (this code assumes that you keep items as rows and columns just represent their properties)
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  3. 24th August 2008, 14:42 #3
    patrik08
    patrik08 is offline Advanced user
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    Default Re: How can I traverse all of the items in a QStandardItemModel

    Ok i found a way to build a dom tree .. from a QStandardItemModel

    a static function to retry child item

    Qt Code: 
    1. static QList<QStandardItem*> childList( QStandardItem *qi )
    2. {
    3.     QStandardItemModel *pm = qi->model();
    4.     QList<QStandardItem*> rList;
    5.     QModelIndex in = qi->index();
    6.     if (!in.isValid()) {
    7.     return rList; 
    8.     }
    9.     if (qi->rowCount() == 0) {
    10.     return rList;  
    11.     }
    12.     for (int e = 0; e < qi->rowCount(); ++e) {
    13.         QModelIndex si = pm->index(e,qi->column(),in);
    14.         QStandardItem *iz = pm->itemFromIndex(si);
    15.         if (iz) {
    16.            rList << iz; 
    17.         }
    18.     }
    19.     return rList; 
    20. }
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    and a class to build a xml

    Qt Code: 
    1. void BookTree::subIterate()
    2. {
    3.     QStandardItemModel *pm = qobject_cast<QStandardItemModel *>(model());
    4.     if (!pm) {
    5.     return;
    6.     }
    8.     int rw = 0;
    9.     int cw = 0;
    10.     int ctot = 0;
    11.     const int cools = pm->columnCount();
    12.     const int rows = pm->rowCount();
    13.     qDebug() << "-- iter ---------------------------------------------------------";
    14.      for (int i = 0; i < cools; ++i) {
    15.          const QString htxt = pm->headerData(i,Qt::Horizontal,Qt::DisplayRole).toString();
    16.          const QString htxt1 = pm->headerData(i,Qt::Vertical,Qt::DisplayRole).toString();
    17.          line << qMax(htxt,htxt1);
    18.      }
    19.      QList<QStandardItem*> list;
    20.      for (int e = 0; e < rows; ++e) { 
    21.          QStandardItem *ix_1 = pm->item(e,0);
    22.          QStandardItem *ix_2 = pm->item(e,1);
    23.          list.clear();
    24.          list = childList(ix_1);
    25.          ctot = list.size();
    26.          int level = 0;
    27.          qDebug() << "# lev." << level <<" line " << e << " txt " << ix_1->text() << "  child " << ctot;
    28.          if (ctot !=0) {
    29.  
    30.                  level++;
    31.                  foreach (QStandardItem *ix,list) {
    32.                  list.clear();
    33.                  ctot = 0;
    34.                  list = childList(ix);
    35.                  ctot = list.size();
    36.                  qDebug() << "# lev." << level <<" line " << e << " txt " << ix->text() << "  child " << ctot; 
    37.  
    38.                  }
    39.          }
    40.      }
    41.     qDebug() << "-- iter ---------------------------------------------------------";
    42. }
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    now i must only transform the tree model -> flat like table to validate link...
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  4. The following user says thank you to patrik08 for this useful post:

    neuronet (17th February 2015)
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