htmldelegate.cpp

#include "htmldelegate.h"
#include <QTextBlock>

void HtmlDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QStyleOptionViewItemV4 optionV4 = option;
    initStyleOption(&optionV4, index);

    QStyle *style = optionV4.widget? optionV4.widget->style() : QApplication::style();

    QTextDocument doc;
    doc.setHtml(optionV4.text);
//    doc.setTextWidth(optionV4.rect.width());
//    doc.setDefaultFont(optionV4.font);
//    doc.setDocumentMargin(0);

    /// Painting item without text
    optionV4.text = QString();
    style->drawControl(QStyle::CE_ItemViewItem, &optionV4, painter);

    QAbstractTextDocumentLayout::PaintContext ctx;

    // Highlighting text if item is selected
    if (optionV4.state & QStyle::State_Selected)
        ctx.palette.setColor(QPalette::Text, optionV4.palette.color(QPalette::Active, QPalette::HighlightedText));

    QRect textRect = style->subElementRect(QStyle::SE_ItemViewItemText, &optionV4);
    painter->save();
    painter->translate(textRect.topLeft());
    painter->setClipRect(textRect.translated(-textRect.topLeft()));
    doc.documentLayout()->draw(painter, ctx);
    painter->restore();
}

QSize HtmlDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QStyleOptionViewItemV4 optionV4 = option;
    initStyleOption(&optionV4, index);

    QTextDocument doc;
    doc.setHtml(optionV4.text);
    doc.setTextWidth(optionV4.rect.width());
    //int height = doc.documentLayout()->blockBoundingRect(doc.firstBlock()).height();
    QFont font(QFont().defaultFamily(),18); // make this bigger, else appears cut off. TODO check why vertical-align:middle; in css does not work

    int height = QFontMetrics(font).boundingRect(optionV4.text.length() > 0 ? QString(optionV4.text.at(0)) : "").height();

    return QSize(doc.idealWidth(), height);
}