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percent_bar_delegate.h
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1
10#ifndef PERCENTBARDELEGATE_H
11#define PERCENTBARDELEGATE_H
12
13/*
14 * @file Percent bar delegate.
15 *
16 * QStyledItemDelegate subclass that will draw a percentage value and a
17 * single-item bar chart for the specified value.
18 *
19 * This is intended to be used in QTreeWidgets to show percentage values.
20 * To use it, first call setItemDelegate:
21 *
22 * myTreeWidget()->setItemDelegateForColumn(col_pct_, new PercentBarDelegate());
23 *
24 * Then, for each QTreeWidgetItem, set a double value using setData:
25 *
26 * setData(col_pct_, Qt::UserRole, QVariant::fromValue<double>(packets_ * 100.0 / num_packets));
27 *
28 * If the item data cannot be converted to a valid double value or if its
29 * text string is non-empty then it will be rendered normally (i.e. the
30 * percent text and bar will not be drawn). This lets you mix normal and
31 * percent bar rendering between rows.
32 */
33
34#include <QStyledItemDelegate>
35
36 class PercentBarDelegate : public QStyledItemDelegate
37{
38 public:
39 PercentBarDelegate(QWidget *parent = 0) : QStyledItemDelegate(parent) { }
40
41 // Make sure QStyledItemDelegate::paint doesn't draw any text.
42 virtual QString displayText(const QVariant &, const QLocale &) const { return QString(); }
43
44 protected:
45 void paint(QPainter *painter, const QStyleOptionViewItem &option,
46 const QModelIndex &index) const;
47 QSize sizeHint(const QStyleOptionViewItem &option,
48 const QModelIndex &index) const;
49
50};
51
52#endif // PERCENTBARDELEGATE_H
PercentBarDelegate
Definition percent_bar_delegate.h:37