progressbardelegate.cpp

#include "progressbardelegate.h"

#include <QPainter>
#include <QtWidgets>

ProgressBarDelegate::ProgressBarDelegate(QObject *parent)
    : QStyledItemDelegate(parent)
    , m_progressBarPtr(new QProgressBar)
{
    m_progressBarPtr->setOrientation(Qt::Horizontal);
}

ProgressBarDelegate::~ProgressBarDelegate() {}

void ProgressBarDelegate::paint(QPainter *painter,
                                const QStyleOptionViewItem &option,
                                const QModelIndex &index) const
{
    QStyleOptionViewItem viewOption(option);
    initStyleOption(&viewOption, index);
    if (option.state.testFlag(QStyle::State_HasFocus)) {
        viewOption.state = viewOption.state ^ QStyle::State_HasFocus;
    }
    QStyledItemDelegate::paint(painter, viewOption, index);

    int value = index.model()->data(index).toUInt();
    if (value < 0) {
        value = 0;
    } else if (value > 100) {
        value = 100;
    }

    int w = qMin(option.rect.width(), option.rect.height()) / 10.0;
    QStyleOptionProgressBar progressBarOption;
    progressBarOption.initFrom(option.widget);
    progressBarOption.rect = option.rect.adjusted(w, w, -w, -w);
    progressBarOption.minimum = 0;
    progressBarOption.maximum = 100;
    progressBarOption.textAlignment = Qt::AlignCenter;
    progressBarOption.textVisible = true;
    progressBarOption.progress = value;
    progressBarOption.text = tr("%1%").arg(progressBarOption.progress);
    progressBarOption.state = QStyle::StateFlag::State_Horizontal;

    painter->save();
    if (option.state & QStyle::State_Selected) {
        painter->fillRect(option.rect, option.palette.highlight());
        painter->setBrush(option.palette.highlightedText());
    }

    option.widget->style()->drawControl(QStyle::CE_ProgressBar,
                                        &progressBarOption,
                                        painter,
                                        m_progressBarPtr.data());

    painter->restore();
}