ui/qt/models/percent_bar_delegate.cpp

   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
  20 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
  86 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 }