Changing QIcon size in QStandardItemModel

Question

I am trying to make QTableView/QStandardItemModel with arbitrary sized qIcons. In the MWE below, I have successfully changed the height of a row using a delegate. I can't figure out how to make it use a larger icon size in the larger row. Any help appreciated. Note that all rows can be the same height as long as I can set that height. For example, how do I make the icons 50x50 in the example below.

#include <QtGui>

#include "test.h"
//////////////////////////////////////////////////////////////////////////
// TEST.H file:
//#include <QtGui>
//
//class MainWindow : public QMainWindow {
//  Q_OBJECT
//
//  public:
//  MainWindow(QWidget *parent = 0);
//};

class ItemDelegate : public QItemDelegate {
public:
  ItemDelegate() {}
  QSize sizeHint ( const QStyleOptionViewItem &, const QModelIndex & ) const {
return QSize(50,50); 
  }
};

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) {

  QImage iconImage(100, 100, QImage::Format_RGB32);
  iconImage.fill(0xF08080);

  const int ARRAY_HEIGHT = 2;
  const int ARRAY_WIDTH  = 2;

  QStandardItemModel *model = new QStandardItemModel( ARRAY_HEIGHT, ARRAY_WIDTH );

  model->setHeaderData( 1, Qt::Horizontal, QString("Icon") );
  model->setHeaderData( 2, Qt::Horizontal, QString("Text") );

  for (int yy=0; yy < ARRAY_HEIGHT; yy++ ) {
QStandardItem *newIconItem = new QStandardItem;
newIconItem->setIcon( QPixmap::fromImage( iconImage ) );
model->setItem( yy, 0, newIconItem );

QStandardItem *newTypeItem = new QStandardItem( QString("Foo") );
model->setItem( yy, 1, newTypeItem );
  }

  QTableView *table = new QTableView;

  ItemDelegate *delegate = new ItemDelegate();

  table->setModel(model);
  table->setItemDelegate(delegate);

  table->setSelectionMode(QAbstractItemView::SingleSelection);
  table->setSelectionBehavior(QAbstractItemView::SelectRows);
  table->verticalHeader()->setVisible(false);
  table->verticalScrollBar()->setVisible(false);

  table->resizeRowsToContents();
  table->resizeColumnsToContents();

  QHeaderView *headerView = table->horizontalHeader();
  headerView->setStretchLastSection(true);

  setCentralWidget( table );
}

int main( int argc, char *argv[] ) {

  QApplication app(argc, argv);
  MainWindow win;

  win.show();

  return app.exec();
}

I've been continuing to look at this. The way to deal with this is to not use "setIcon", which converts the QPixmap into an icon. Instead, calling setData( QPixmap::fromImage( iconImage ), Qt::DecorationRole ) does the trick. I confess that while I've worked with Qt for a while, I do not yet have my head wrapped around all of the uses of StandardItems, StandardItemModels, and QVariants. Also not that if I were writing this from scratch, I would look at QTableWidgets (see "Cannot put an image in a table" for example) — user2064766, Jul 12 '13 at 16:33

score 1 · Answer 1 · answered Jun 05 '19 at 08:40

1

try

ListView->setIconSize(QSize(100,100));

answered Jun 05 '19 at 08:40

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Changing QIcon size in QStandardItemModel

1 Answers1