53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
/* percent_bar_delegate.h
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef PERCENTBARDELEGATE_H
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#define PERCENTBARDELEGATE_H
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/*
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* @file Percent bar delegate.
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*
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* QStyledItemDelegate subclass that will draw a percentage value and a
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* single-item bar chart for the specified value.
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*
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* This is intended to be used in QTreeWidgets to show percentage values.
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* To use it, first call setItemDelegate:
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*
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* myTreeWidget()->setItemDelegateForColumn(col_pct_, new PercentBarDelegate());
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*
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* Then, for each QTreeWidgetItem, set a double value using setData:
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*
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* setData(col_pct_, Qt::UserRole, QVariant::fromValue<double>(packets_ * 100.0 / num_packets));
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*
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* If the item data cannot be converted to a valid double value or if its
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* text string is non-empty then it will be rendered normally (i.e. the
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* percent text and bar will not be drawn). This lets you mix normal and
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* percent bar rendering between rows.
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*/
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#include <QStyledItemDelegate>
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class PercentBarDelegate : public QStyledItemDelegate
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{
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public:
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PercentBarDelegate(QWidget *parent = 0) : QStyledItemDelegate(parent) { }
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// Make sure QStyledItemDelegate::paint doesn't draw any text.
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virtual QString displayText(const QVariant &, const QLocale &) const { return QString(); }
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protected:
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void paint(QPainter *painter, const QStyleOptionViewItem &option,
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const QModelIndex &index) const;
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QSize sizeHint(const QStyleOptionViewItem &option,
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const QModelIndex &index) const;
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};
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#endif // PERCENTBARDELEGATE_H
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