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Thread: trying to get a QIcon into the center of a QTableWidgetItem

  1. 21st October 2021, 01:20 #1
    StephenHazel
    StephenHazel is offline Greenhorn
    Join Date
    May 2021
    Posts
    1
    Qt products
    Qt5
    Platforms
    Unix/X11

    Default trying to get a QIcon into the center of a QTableWidgetItem

    icons seem to only show up on the left within the item.

    I've tried overriding paint() within my attached QStyledItemDelegate derived class, but it still only shows on the left.

    Within my table, when a column is showing an icon, I need it to occupy the center of the whole QTableWidgetItem (cell).

    Below is my, uhhh, not very pretty code.

    My main code populating the table has a callback func to populate QComboBoxs and other stuff.
    QComboBoxes are the main reason I add the SIDlg class derived from QStyledItemDelegate.

    I -think- It's just the paint() method within class SIDlg that needs some work.
    But I don't know how to get the whole rectangle (I think that's the problem??)

    Qt Code: 
    1. // Populating table:
    2.  
    3. // my main window class has a 
    4. CtlTabl _tr;
    5.  
    6. // window class init function has this hooking design time tr which is a QTableWidget
    7. // column headers in a zz string
    8. // * prefix means show an icon.  _ prefix for edited column.  ^ prefix means QComboBox edited  > means right justified
    9.    _tr.Init (ui->tr,
    10.       "*Lrn\0"
    11.      "*^Hand\0"
    12.       "_Track\0"
    13.       "^SoundDir\0"
    14.       "^Sound\0"
    15.        "Dev.Chan\0"
    16.        "Mix\0"
    17.       ">Notes\0"
    18.       ">Ctrls\0", TrPop);
    19.    _tr.SetRowH (Up.txH - 4);
    20.  
    21.    ui->tr->setContextMenuPolicy (Qt::CustomContextMenu); 
    22.    connect (ui->tr, & QTableWidget::itemClicked, this, & PCheetah::TrClk);
    23.    connect (ui->tr, & QTableWidget::customContextMenuRequested, 
    24.                                                  this, & PCheetah::TrClkR);
    25.    connect (ui->tr, & QTableWidget::itemChanged, this, & PCheetah::TrUpd);
    26.  
    27.  
    28. // Then populated as:
    29.  
    30.      char *rp [32];
    31.       _tr.Open ();
    32.       for (ubyte i = 0, tc = 0;  i < Up.rTrk;  i++) {
    33.          rp [0] = Up.trk [i].lrn;       rp [1] = Up.trk [i].ez;
    34.          rp [2] = Up.trk [i].name;      rp [3] = Up.trk [i].grp;
    35.          rp [4] = Up.trk [i].snd;       rp [5] = Up.trk [i].dev;
    36.          rp [6] = CC("");               rp [7] = Up.trk [i].notes;
    37.          rp [8] = Up.trk [i].ctrls;     rp [9] = nullptr;
    38.          _tr.Put (rp);
    39.          if (Cfg.ntCo == 2) {          // color by track
    40.             if ((rp [0][0] == 'l') || (rp [1][0] == 'S')) 
    41.                _tr.SetColor (i, CMap (tc++));
    42.          }
    43.          else {
    44.             switch (rp [1][0]) {
    45.                case 'L':  tc = 0;   break;
    46.                case 'R':  tc = 1;   break;
    47.                default:   tc = 9;
    48.             }
    49.             if (tc < 2)  _tr.SetColor (i, CTnt [tc]);
    50.          }
    51.  
    52.       }
    53.       _tr.Shut ();   _tr.HopTo (Up.eTrk, 0);
    54.  
    55.  
    56.  
    57.  
    58. typedef void (*ppop)(char *ls, ubyt2 r, ubyte c);
    59.  
    60. class SIDlg: public QStyledItemDelegate {
    61.    Q_OBJECT
    62. private:
    63.    char *_ed;
    64.    ppop  _pop;
    65.    QTableWidget *_tbl;
    66.  
    67. public:
    68.    SIDlg (QObject *par, char *ed, ppop pop);
    69.   ~SIDlg ()  {}
    70.    void     paint         (QPainter *p, const QStyleOptionViewItem &opt,
    71.                                         const QModelIndex &ind)  const override;   
    72.    QWidget *createEditor  (QWidget *tb, const QStyleOptionViewItem &opt,
    73.                                         const QModelIndex &ind)  const override;
    74.    void     setEditorData (QWidget *ed, const QModelIndex &ind)  const override;
    75.    void     setModelData  (QWidget *ed, QAbstractItemModel *mod,
    76.                                         const QModelIndex &ind)  const override;
    77. public slots:
    78.    void cbChanged (int i);
    79. };
    80.  
    81.  
    82. class CtlTabl {
    83. public:
    84.    CtlTabl ()  {_t = nullptr;   _nr = _tr = _ih = _tc = 0;}
    85.   ~CtlTabl ()  {}
    86.  
    87. // hdr is zz string of labels
    88. //  >| prefix means right or center just
    89. //  _^ prefix means string or combo edit
    90.    void  Init    (QTableWidget *t, const char *hdr, ppop pop = nullptr);
    91.    void  SetRowH (ubyt2 h);
    92.    ubyt2 ColW    (ubyte c);
    93.    void  SetColW (ubyte c, ubyt2 w);
    94.    ubyt2 NRow    ();
    95.    ubyte NCol    ();
    96.    ubyt2 CurRow  ();
    97.    ubyte CurCol  ();
    98.    char *Get     (ubyt2 r, ubyte c);
    99.    void  Set     (ubyt2 r, ubyte c, char *s);
    100.    void  HopTo   (ubyt2 r, ubyte c);
    101.    void  SetColor (ubyt2 r, QColor c);
    102.  
    103.    void  Open    ();
    104.    void  Put     (char **rp);
    105.    void  Shut    ();
    106.  
    107. private:
    109.    char  _ju [40];
    110.    char  _ed [40];
    111.    ubyt2 _nr, _tr, _ih;
    112.    ubyte      _tc;
    113. };
    114.  
    115.  
    116. SIDlg::SIDlg (QObject *par, char *ed, ppop pop)
    117. : QStyledItemDelegate (par)
    118. {  _ed = ed;   _pop = pop;  }
    119.  
    120. void SIDlg::paint (QPainter *p, const QStyleOptionViewItem &opt,
    121.                                 const QModelIndex &ind)  const
    122. {  if (! opt.icon.isNull ()) 
    123.         {p->save ();   opt.icon.paint (p, opt.rect);
    124.          p->restore ();}
    125.    else  QStyledItemDelegate::paint (p, opt, ind);
    126. }
    127.  
    128. void SIDlg::cbChanged (int i)
    129. { QComboBox *cb = qobject_cast<QComboBox *>(sender ());
    130.    (void)i;   emit commitData (cb);   emit closeEditor (cb);
    131. }
    132.  
    133. QWidget *SIDlg::createEditor (QWidget *par, const QStyleOptionViewItem &opt,
    134.                               const QModelIndex &ind)  const
    135. { BStr bs;
    136.   char *s;
    137.    if (_ed [ind.column ()] == '^') {
    138.       _pop (bs, ind.row (), ind.column ());
    139.       if (*bs == 0)  return nullptr;
    140.  
    141.      QComboBox *cb = new QComboBox (par);
    142.       for (s = bs;  *s;  s = & s [StrLn (s)+1])   
    143.          cb->addItem (StrCm (s, CC("-")) ? s : "");
    144.       return cb;
    145.    }
    146.    return    QStyledItemDelegate::createEditor (par, opt, ind);
    147. }
    148.  
    149. void SIDlg::setEditorData (QWidget *ed, const QModelIndex &ind)  const
    150. { QComboBox *cb = qobject_cast<QComboBox *>(ed);
    151.    if (cb) {
    152.      int i = cb->findText (ind.data (Qt::EditRole).toString ());
    153.       if (i < 0)  i = 0;
    154.       cb->setCurrentIndex (i);   cb->showPopup ();
    155.       connect (cb, & QComboBox::currentIndexChanged,
    156.                this,   & SIDlg::cbChanged);
    157.    }
    158.    else  QStyledItemDelegate::setEditorData (ed, ind);
    159. }
    160.  
    161. void SIDlg::setModelData (QWidget *ed, QAbstractItemModel *mod,
    162.                           const QModelIndex &ind)  const
    163. { QComboBox *cb = qobject_cast<QComboBox *>(ed);
    164.    if (cb)  mod->setData (ind, cb->currentText (), Qt::EditRole);
    165.    else  QStyledItemDelegate::setModelData (ed, mod, ind);
    166. }
    167.  
    168.  
    169. void CtlTabl::Init (QTableWidget *t, const char *hdr, ppop pop)
    170. // hdr is zz string of labels
    171. //  *  prefix means icon
    172. //  >| prefix means right or center just
    173. //  _^ prefix means string or combo edit
    174. { ubyte c;
    175.   char *h;
    176.   char  ed = '\0';      // _ means editing, ^ means QComboBox so delegate too
    178.    _t = t;
    179.    for (c = 0, h = CC(hdr);  *h;  c++, h = & h [StrLn (h)+1]) {
    180.       _ju [c] = _ed [c] = '\0';
    181.       if ((*h == '*') || (*h == '>') || (*h== '|'))  _ju [c] = *h++;
    182.       if  (*h == '_') {_ed [c] =      *h++;   if (ed != '^') ed = '_';}
    183.       if  (*h == '^')  _ed [c] = ed = *h++;
    184.       sl << QString::fromStdString (h);
    185.    }
    186.    _t->horizontalHeader ()->setSectionResizeMode (
    187.                                                  QHeaderView::ResizeToContents);
    188.    _t->setColumnCount (c);   _t->setHorizontalHeaderLabels (sl);
    189.    _t->verticalHeader ()->hide ();
    190.    _t->setAlternatingRowColors (false);
    191.    if (ed == '^')  _t->setItemDelegate (new SIDlg (_t, _ed, pop));
    192.    _t->setEditTriggers (ed ? QAbstractItemView::AllEditTriggers
    193.                            : QAbstractItemView::NoEditTriggers);
    194.    _t->setSelectionBehavior (QAbstractItemView::SelectRows);
    195. }
    196.  
    197. /* _t->horizontalHeader ()->setSectionResizeMode (2, QHeaderView::Fixed)
    198. ** _t->horizontalHeader ()->setStretchLastSection (true);
    199. ** _t->horizontalHeader ()->setHighlightSections (false);
    200. ** _t->setSelectionBehavior (QAbstractItemView::SelectItems/Rows);
    201. ** _t->setSelectionMode     (QAbstractItemView::ExtendedSelection);
    202. ** _t->setGridShow (false);
    203. */
    204.  
    205. void  CtlTabl::SetRowH (ubyt2 h)
    206. {  _t->verticalHeader ()->setDefaultSectionSize (h);  
    207.    _t->setIconSize (QSize (h, h));
    208.    _ih = h;
    209. }
    210.  
    211. ubyt2 CtlTabl::ColW    (ubyte c)  {return _t->columnWidth (c);}
    212. void  CtlTabl::SetColW (ubyte c, ubyt2 w)
    213. {  _t->horizontalHeader ()->setSectionResizeMode (c, QHeaderView::Fixed);
    214.    _t->setColumnWidth (c, w);
    215. }
    216.  
    217. ubyt2 CtlTabl::NRow ()    {return _t->rowCount ();}
    218. ubyte CtlTabl::NCol ()    {return _t->columnCount ();}
    219. ubyt2 CtlTabl::CurRow ()  {return _t->currentRow ();}
    220. ubyte CtlTabl::CurCol ()  {return _t->currentColumn ();}
    221. char *CtlTabl::Get (ubyt2 r, ubyte c)  {return UnQS (_t->item (r, c)->text ());}
    222.  
    223. // clip cuz too many chars to post
    224.  
    225. void CtlTabl::Open ()
    226. {  _tr = CurRow ();   _tc = CurCol ();
    227.    _t->hide ();   _t->blockSignals (true);
    228.    _t->clearContents ();   _t->setRowCount (0);
    229.    _nr = 0;
    230. }
    231.  
    232. void CtlTabl::Put (char **rp)
    233. { ubyte c;
    234.   TStr  ico;
    236.    _t->setRowCount (_nr+1);
    237.    for (c = 0;  *rp;  c++, rp++) {
    238.       if (! (it = _t->item (_nr, c)))
    239.                _t->setItem (_nr, c, it = new QTableWidgetItem);
    240.       if (_ed [c])  it->setFlags (it->flags () |  Qt::ItemIsEditable);
    241.       else          it->setFlags (it->flags () & ~Qt::ItemIsEditable);
    242.       if (_ju [c] == '*') {
    243.          if (**rp) {
    244.             if      (**rp == '*')  it->setText (++(*rp));
    245.             else if (**rp)         it->setIcon (QIcon (StrFmt (ico,
    246.                                                             ":/tico/`s", *rp)));
    247.             else                   it->setIcon (QIcon ());
    248.          }
    249.       }
    250.       else {
    251.          if (_ju [c] == '>')  it->setTextAlignment (Qt::AlignRight);
    252.          if (_ju [c] == '|')  it->setTextAlignment (Qt::AlignCenter);
    253.          it->setText (*rp);
    254.       }
    255.    }
    256.    _nr++;
    257. }
    258.  
    259. void CtlTabl::Shut ()
    260. {  _t->show ();   _t->blockSignals (false);  HopTo (_tr, _tc);  }
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    Last edited by d_stranz; 21st October 2021 at 16:44. Reason: Removed inappropriate FONT tags.
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