如何在QStyledItemDelegate中绘制整行的背景?

时间:2010-03-12 16:10:29

标签: c++ qt qitemdelegate

我有一个QTableView,我正在设置自定义QStyledItemDelegate。

除了自定义项目绘制外,我还想为选择/悬停状态设置行的背景颜色样式。我想要的外观就是这样的KGet截图: KGet's Row Background http://www.binaryelysium.com/images/kget_background.jpeg

这是我的代码:

void MyDelegate::paint( QPainter* painter, const QStyleOptionViewItem& opt, const    QModelIndex& index ) const
{
    QBrush backBrush;
    QColor foreColor;
    bool hover = false;
    if ( opt.state & QStyle::State_MouseOver )
    {
           backBrush = opt.palette.color( QPalette::Highlight ).light( 115 );
           foreColor = opt.palette.color( QPalette::HighlightedText );
           hover = true;
    }
    QStyleOptionViewItemV4 option(opt);
    initStyleOption(&option, index);
    painter->save();
    const QStyle *style = option.widget ? option.widget->style() : QApplication::style();
    const QWidget* widget = option.widget;
    if( hover )
    {
            option.backgroundBrush = backBrush;
    }
    painter->save();
    style->drawPrimitive(QStyle::PE_PanelItemViewItem, &option, painter, widget);
    painter->restore();
    switch( index.column() )
    {
    case 0: // we want default behavior
        style->drawControl(QStyle::CE_ItemViewItem, &option, painter, widget);
        break;
    case 1:
    // some custom drawText
    break;
    case 2:
    // draw a QStyleOptionProgressBar
    break;
    }
    painter->restore();
}

结果是每个单独的单元格仅在鼠标悬停在其上时才接收到mousedover背景,而不是整个行。这很难描述所以这里有一个截图: The result of the above code http://www.binaryelysium.com/images/loader_bg.jpeg

在那张图片中,鼠标位于最左侧的单元格上,因此突出显示了背景..但我希望在整个行上绘制背景。

我怎样才能做到这一点?

编辑:更多的想法我已经意识到QStyle :: State_MouseOver状态仅被传递给鼠标结束的实际单元格,并且当为行中的其他单元格调用paint方法时QStyle :: State_MouseOver未设置。

所以问题就变成了QStyle :: State_MouseOver_ Row 状态(答案:否),那么我该如何实现呢?

2 个答案:

答案 0 :(得分:0)

当鼠标在一行上时,您需要告诉视图更新其单元格,因此我建议您在模型中跟踪它。然后在paint事件中,您可以使用自定义数据角色从模型索引中请求该数据。

答案 1 :(得分:0)

void TrackDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{

    QStyleOptionViewItem  viewOption(option);
    if (viewOption.state & QStyle::State_HasFocus)
        viewOption.state = viewOption.state ^ QStyle::State_HasFocus;

    QImage image(m_RowBackGroundImagePath);
    QPixmap pixmap(m_RowBackGroundImagePath);
    qDebug()<<"forward"<<pixmap.width()<<pixmap.height();
    pixmap.scaled(option.rect.width(),option.rect.height());
    qDebug()<<"back"<<pixmap.width()<<pixmap.height();
    qDebug()<<option.rect.width()<<option.rect.height();
    QBrush brush(pixmap);
    painter->save();
    painter->fillRect(option.rect, brush/*QColor(238, 233, 233, 255)*/);
    painter->restore();
    viewOption.rect = QRect(option.rect.x(), option.rect.y(), option.rect.width(), option.rect.height());
    //viewOption.palette.setColor(QPalette::Text, QColor(Qt::red));
    //viewOption.palette.setBrush ( QPalette::ButtonText, brush1);
    QItemDelegate::paint(painter, viewOption,index);

    int progress = index.model()->data(index,Qt::DisplayRole).toInt();
    QStyleOptionProgressBar progressBarOption;
    progressBarOption.rect = QRect(option.rect.x(), option.rect.y()+(SETHEIGHT - PROGRESSBARHEIGHT)/2, option.rect.width(), /*option.rect.height()*/PROGRESSBARHEIGHT);

    //qDebug()<<progressBarOption.rect.x()<<progressBarOption.rect.y()<<progressBarOption.rect.height()<<progressBarOption.rect.width();
    //qDebug()<<option.rect.x()<<option.rect.y()<<option.rect.height()<<option.rect.width();

    progressBarOption.state |= QStyle::State_Enabled;
    progressBarOption.direction = QApplication::layoutDirection();
    progressBarOption.fontMetrics = QApplication::fontMetrics();
    progressBarOption.minimum = 0;
    progressBarOption.maximum = 100;
    progressBarOption.textAlignment = Qt::AlignCenter;
    progressBarOption.textVisible = true;
    progressBarOption.progress = progress < 0 ? 0 : progress;
    progressBarOption.text = QString().sprintf("%d%%", progressBarOption.progress);
    QApplication::style()->drawControl(QStyle::CE_ProgressBar, &progressBarOption, painter);
    break;
}