CODEWITHSUNDEEP
qtqt4
PIntag
PIntag

Reputation: 962

How can I apply a global QListView style to a QListWidget that uses a QAbstractItemDelegate for customized item display?

I have successfully created a QListWidget that displays 2 lines of text for each item using this code (adapted from this example):

SessionListDelegate.h

#ifndef SESSIONLISTDELEGATE_H_
#define SESSIONLISTDELEGATE_H_

#include <QPainter>
#include <QAbstractItemDelegate>

class SessionListDelegate : public QAbstractItemDelegate
{
public:
    SessionListDelegate(QObject *parent = 0, QStyle *style);
    virtual ~SessionListDelegate();

    void paint (QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index) const;
    QSize sizeHint (const QStyleOptionViewItem & option, const QModelIndex & index) const;
private:
};

#endif /* SESSIONLISTDELEGATE_H_ */

SessionListDelegate.cpp

#include "SessionListDelegate.h"

SessionListDelegate::SessionListDelegate(QObject *parent)
: QAbstractItemDelegate(parent)
{
    this->_parent = parent;
}

void SessionListDelegate::paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index) const
{
    QRect r = option.rect;

    QPen fontPen(QColor::fromRgb(51,51,51), 1, Qt::SolidLine);

    if(option.state & QStyle::State_Selected)
    {
        painter->fillRect(option.rect, option.palette.color(QPalette::Highlight));
    }
    painter->setPen(fontPen);

    QString date = index.data(Qt::DisplayRole).toString();
    QString description = index.data(Qt::UserRole).toString();

    int imageSpace = 10;

    r = option.rect.adjusted(imageSpace, 0, -10, -30);
    painter->setFont(QFont( "Lucida Grande", 24, QFont::Normal));
    painter->drawText(r.left(), r.top(), r.width(), r.height(), Qt::AlignBottom|Qt::AlignLeft, date, &r);

    r = option.rect.adjusted(imageSpace, 30, -10, 0);
    painter->setFont(QFont( "Lucida Grande", 18, QFont::Normal));
    painter->drawText(r.left(), r.top(), r.width(), r.height(), Qt::AlignLeft, description, &r);

}

QSize SessionListDelegate::sizeHint(const QStyleOptionViewItem & option, const QModelIndex & index) const
{
   return QSize(200, 60); // very dumb value
}

SessionListDelegate::~SessionListDelegate()
{
    // TODO Auto-generated destructor stub
}

Calling code in mainapp.cpp:

ui.myList->setItemDelegate(new SessionListDelegate(ui.myList));

Now, in the main QWidget form of my application UI, I have defined a style sheet which contains a style for all QListViews for the form:

QListView::item:selected {
color: black;
background-color: qlineargradient(spread:pad, x1:0, y1:1, x2:0, y2:0, stop:0 rgba(255, 255, 80, 255), stop:1 rgba(255, 255, 255, 255));
}

I would like to apply this style to the customized ListWidget, but I can't think of a way to make that happen. It seems like it should be a pretty common thing to do, but I can't find any examples anywhere.

Upvotes: 1

Views: 1222

Answers (1)

pnezis
pnezis

Reputation: 12321

I think you should inherit from QStyledItemDelegate instead of QAbstractItemDelegate. From the Qt documentation:

Since Qt 4.4, there are two delegate classes: QItemDelegate and QStyledItemDelegate. However, the default delegate is QStyledItemDelegate. These two classes are independent alternatives to painting and providing editors for items in views. The difference between them is that QStyledItemDelegate uses the current style to paint its items. We therefore recommend using QStyledItemDelegate as the base class when implementing custom delegates or when working with Qt style sheet

Upvotes: 2

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