How to get Icons in QTableWidgetItem to take up the whole item space

[Slewman]

Posted something about this earlier... but it kinda got lost in the posts... so im posing the question again with a better title haha.

i have written a custom item delegate... but it doesnt seem to work

class MyItemDelegate: public QItemDelegate
{
public:
   MyItemDelegate(QObject* pParent = 0) : QItemDelegate(pParent)
   {
   }
   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);
   }
};

class MyItemDelegate: public QItemDelegate
{
public:
   MyItemDelegate(QObject* pParent = 0) : QItemDelegate(pParent)
   {
   }
   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);
   }
};

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anyone have any ideas? im real desperate to get this thing working, ive been working on it for days now and i dont know where else to look

[Slewman]

seriously though... anyone see anything obvious that i am not doing? im going insane over here... its like im taking crazy pills!

[Slewman]

got something to work... not perfect, but the icon will now keep aspect ration in the item. enjoy!!!

#include <QStyledItemDelegate>
#include <QPainter>
 
class ItemDelegate : public QStyledItemDelegate
{
public:
    enum ItemDataRole { SubTextRole = Qt::UserRole + 100 };
 
    ItemDelegate(QObject *parent = 0) : QStyledItemDelegate(parent) {}
    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
    void paint(QPainter *p, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
 
QSize ItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QIcon icon = qvariant_cast<QIcon>(index.data(Qt::DecorationRole));
    QString line1 = index.data(Qt::DisplayRole).toString();
    //QString line2 = index.data(SubTextRole).toString();
 
    int textW = option.fontMetrics.width(line1);
    QSize iconSize = icon.actualSize(option.decorationSize);
 
    return QSize(iconSize.width() + 4,
                 iconSize.height() + 2 + option.fontMetrics.lineSpacing() * 2 + 4);
}
 
void ItemDelegate::paint(QPainter *p, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    p->save();
 
    QString line1 = index.data(Qt::DisplayRole).toString();
    QString line2 = index.data(SubTextRole).toString();
 
    QStyleOptionViewItemV4 opt(option);
    initStyleOption(&opt, index);
 
    QStyle *style = opt.widget->style();
    style->drawPrimitive(QStyle::PE_PanelItemViewItem, &opt, p, opt.widget);
 
    if (option.state & QStyle::State_Selected)
        p->setPen(QPen(option.palette.brush(QPalette::HighlightedText), 0));
 
    QRect itemRect = option.rect.adjusted(2, 2, -2, -2);
    QRect r = QStyle::alignedRect(opt.direction, Qt::AlignHCenter | Qt::AlignLeft, itemRect.size(), itemRect);
    opt.icon.paint(p, r);
 
    int h = option.fontMetrics.lineSpacing();
    QRect textRect(itemRect.left(), itemRect.bottom() - h, itemRect.width(), h);
 
    p->drawText(textRect, Qt::AlignVCenter | Qt::AlignHCenter, line1);
 
    QColor subTextColor = p->pen().color();
    subTextColor.setAlphaF(.5);
 
    p->restore();
}

#include <QStyledItemDelegate>
#include <QPainter>

class ItemDelegate : public QStyledItemDelegate
{
public:
    enum ItemDataRole { SubTextRole = Qt::UserRole + 100 };

    ItemDelegate(QObject *parent = 0) : QStyledItemDelegate(parent) {}
    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
    void paint(QPainter *p, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};

QSize ItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QIcon icon = qvariant_cast<QIcon>(index.data(Qt::DecorationRole));
    QString line1 = index.data(Qt::DisplayRole).toString();
    //QString line2 = index.data(SubTextRole).toString();

    int textW = option.fontMetrics.width(line1);
    QSize iconSize = icon.actualSize(option.decorationSize);

    return QSize(iconSize.width() + 4,
                 iconSize.height() + 2 + option.fontMetrics.lineSpacing() * 2 + 4);
}

void ItemDelegate::paint(QPainter *p, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    p->save();

    QString line1 = index.data(Qt::DisplayRole).toString();
    QString line2 = index.data(SubTextRole).toString();

    QStyleOptionViewItemV4 opt(option);
    initStyleOption(&opt, index);

    QStyle *style = opt.widget->style();
    style->drawPrimitive(QStyle::PE_PanelItemViewItem, &opt, p, opt.widget);

    if (option.state & QStyle::State_Selected)
        p->setPen(QPen(option.palette.brush(QPalette::HighlightedText), 0));

    QRect itemRect = option.rect.adjusted(2, 2, -2, -2);
    QRect r = QStyle::alignedRect(opt.direction, Qt::AlignHCenter | Qt::AlignLeft, itemRect.size(), itemRect);
    opt.icon.paint(p, r);

    int h = option.fontMetrics.lineSpacing();
    QRect textRect(itemRect.left(), itemRect.bottom() - h, itemRect.width(), h);

    p->drawText(textRect, Qt::AlignVCenter | Qt::AlignHCenter, line1);

    QColor subTextColor = p->pen().color();
    subTextColor.setAlphaF(.5);

    p->restore();
}

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