Why isnt MyItemDelegate working??? please help!

**Slewman** · 23rd February 2010, 23:00

so i am trying to get an icon to fill up the space of a QTableWidgetItem. so i subclassed the ItemDelegate and set it to my QTableWidget, but still, the icons wont fill out the item in the table.

here is my code... below is what i have at the top of my *.cpp file

Qt Code:

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class MyItemDelegate: public QItemDelegate
{
public:
   MyItemDelegate(QObject* pParent = 0) : QItemDelegate(pParent)
   {
      std::cout<<"INSIDE DELEGATE PAINT~~~~~~~~~~~~~~~~~~"<<std::endl;
   }
   void MyItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
   {
      QIcon icon = qvariant_cast<QIcon>(index.data(Qt::DecorationRole));
      drawBackground(painter, option, index);
      drawDecoration(painter, option, option.rect, icon.pixmap(option.rect.size()));
      drawFocus(painter, option, option.rect);
      std::cout<<"INSIDE DELEGATE PAINT"<<std::endl;
   }
};

class MyItemDelegate: public QItemDelegate
{
public:
   MyItemDelegate(QObject* pParent = 0) : QItemDelegate(pParent)
   {
      std::cout<<"INSIDE DELEGATE PAINT~~~~~~~~~~~~~~~~~~"<<std::endl;
   }
   void MyItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
   {
      QIcon icon = qvariant_cast<QIcon>(index.data(Qt::DecorationRole));
      drawBackground(painter, option, index);
      drawDecoration(painter, option, option.rect, icon.pixmap(option.rect.size()));
      drawFocus(painter, option, option.rect);
      std::cout<<"INSIDE DELEGATE PAINT"<<std::endl;
   }
};

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and here is where i am setting the delegate to my table

Qt Code:

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mThumbArea->setItemDelegate(new MyItemDelegate(mThumbArea));

mThumbArea->setItemDelegate(new MyItemDelegate(mThumbArea));

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here is where i add the icon to the table

Qt Code:

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QTableWidgetItem *newItemImage = new QTableWidgetItem(QIcon(filename),"");
   mThumbArea->setItem(0,0,newItemImage);

QTableWidgetItem *newItemImage = new QTableWidgetItem(QIcon(filename),"");
   mThumbArea->setItem(0,0,newItemImage);

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filename is valid, and the item is successfully added to the table, its just that the icon is much too small... what is happening!!!

**been_1990** · 24th February 2010, 01:20

QIcon.pixmap() says:

Returns a pixmap with the requested size, mode, and state, generating one if necessary. The pixmap might be smaller than requested, but never larger.

Maybe go:

Qt Code:

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icon.pixmap(QSize(50,50));

icon.pixmap(QSize(50,50));

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Just to see if it get's bigger?

**Slewman** · 24th February 2010, 14:03

No that didnt change the size. the icon is still scaled down and shoved to the left side of the item box.

**Slewman** · 24th February 2010, 15:59

anyone have any ideas? ive been banging my head against my computer all day yesterday and today... i cant seem to figure out what the problem is!

**Slewman** · 24th February 2010, 19:22

do i have to continuously set my item delegate whenever i am trying to add an item to my table or do i only need to set the item delegate once in the constructor of my class... seriously... i dont know what im doing wrong... trying EVERYTHING!