1 /* percent_bar_delegate.cpp
2 *
3 * Wireshark - Network traffic analyzer
4 * By Gerald Combs <gerald@wireshark.org>
5 * Copyright 1998 Gerald Combs
6 *
7 * SPDX-License-Identifier: GPL-2.0-or-later
8 */
9
10 #include <ui/qt/models/percent_bar_delegate.h>
11
12 #include <ui/qt/utils/color_utils.h>
13
14 #include <QApplication>
15 #include <QPainter>
16
17 static const int bar_em_width_ = 8;
18 static const double bar_blend_ = 0.15;
19
paint(QPainter * painter,const QStyleOptionViewItem & option,const QModelIndex & index) const20 void PercentBarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
21 const QModelIndex &index) const
22 {
23 QStyleOptionViewItem option_vi = option;
24 QStyledItemDelegate::initStyleOption(&option_vi, index);
25
26 // Paint our rect with no text using the current style, then draw our
27 // bar and text over it.
28 QStyledItemDelegate::paint(painter, option, index);
29
30 bool ok = false;
31 double value = index.data(Qt::UserRole).toDouble(&ok);
32
33 if (!ok || !index.data(Qt::DisplayRole).toString().isEmpty()) {
34 // We don't have a valid value or the item has visible text.
35 return;
36 }
37
38 // If our value is out range our caller has a bug. Clamp the graph and
39 // Print the numeric value so that the bug is obvious.
40 QString pct_str = QString::number(value, 'f', 1);
41 if (value < 0) {
42 value = 0;
43 }
44 if (value > 100.0) {
45 value = 100.0;
46 }
47
48 if (QApplication::style()->objectName().contains("vista")) {
49 // QWindowsVistaStyle::drawControl does this internally. Unfortunately there
50 // doesn't appear to be a more general way to do this.
51 option_vi.palette.setColor(QPalette::All, QPalette::HighlightedText,
52 option_vi.palette.color(QPalette::Active, QPalette::Text));
53 }
54
55 QPalette::ColorGroup cg = option_vi.state & QStyle::State_Enabled
56 ? QPalette::Normal : QPalette::Disabled;
57 QColor text_color = option_vi.palette.color(cg, QPalette::Text);
58 QColor bar_color = ColorUtils::alphaBlend(option_vi.palette.windowText(),
59 option_vi.palette.window(), bar_blend_);
60
61 if (cg == QPalette::Normal && !(option_vi.state & QStyle::State_Active))
62 cg = QPalette::Inactive;
63 if (option_vi.state & QStyle::State_Selected) {
64 text_color = option_vi.palette.color(cg, QPalette::HighlightedText);
65 bar_color = ColorUtils::alphaBlend(option_vi.palette.color(cg, QPalette::Window),
66 option_vi.palette.color(cg, QPalette::Highlight),
67 bar_blend_);
68 }
69
70 painter->save();
71 int border_radius = 3; // We use 3 px elsewhere, e.g. filter combos.
72 QRect pct_rect = option.rect;
73 pct_rect.adjust(1, 1, -1, -1);
74 pct_rect.setWidth(((pct_rect.width() * value) / 100.0) + 0.5);
75 painter->setPen(Qt::NoPen);
76 painter->setBrush(bar_color);
77 painter->drawRoundedRect(pct_rect, border_radius, border_radius);
78 painter->restore();
79
80 painter->save();
81 painter->setPen(text_color);
82 painter->drawText(option.rect, Qt::AlignCenter, pct_str);
83 painter->restore();
84 }
85
sizeHint(const QStyleOptionViewItem & option,const QModelIndex & index) const86 QSize PercentBarDelegate::sizeHint(const QStyleOptionViewItem &option,
87 const QModelIndex &index) const
88 {
89 return QSize(option.fontMetrics.height() * bar_em_width_,
90 QStyledItemDelegate::sizeHint(option, index).height());
91 }
92