src/gui/log/loglistview.cpp

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2020  Prince Gupta <jagannatharjun11@gmail.com>
   4  * Copyright (C) 2019  sledgehammer999 <hammered999@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  * In addition, as a special exception, the copyright holders give permission to
  21  * link this program with the OpenSSL project's "OpenSSL" library (or with
  22  * modified versions of it that use the same license as the "OpenSSL" library),
  23  * and distribute the linked executables. You must obey the GNU General Public
  24  * License in all respects for all of the code used other than "OpenSSL".  If you
  25  * modify file(s), you may extend this exception to your version of the file(s),
  26  * but you are not obligated to do so. If you do not wish to do so, delete this
  27  * exception statement from your version.
  28  */
  29
  30 #include "loglistview.h"
  31
  32 #include <QtSystemDetection>
  33 #include <QApplication>
  34 #include <QClipboard>
  35 #include <QFontMetrics>
  36 #include <QKeyEvent>
  37 #include <QPainter>
  38 #include <QStyle>
  39 #include <QStyledItemDelegate>
  40
  41 #include "base/global.h"
  42 #include "logmodel.h"
  43
  44 #ifdef Q_OS_WIN
  45 #include "base/preferences.h"
  46 #endif
  47
  48 namespace
  49 {
  50     const QString SEPARATOR = u" - "_s;
  51
  52     int horizontalAdvance(const QFontMetrics &fontMetrics, const QString &text)
  53     {
  54         return fontMetrics.horizontalAdvance(text);
  55     }
  56
  57     QString logText(const QModelIndex &index)
  58     {
  59         return index.data(BaseLogModel::TimeRole).toString()
  60             + SEPARATOR
  61             + index.data(BaseLogModel::MessageRole).toString();
  62     }
  63
  64     class LogItemDelegate final : public QStyledItemDelegate
  65     {
  66     public:
  67         explicit LogItemDelegate(QObject *parent = nullptr)
  68             : QStyledItemDelegate(parent)
  69 #ifdef Q_OS_WIN
  70             , m_useCustomUITheme(Preferences::instance()->useCustomUITheme())
  71 #endif
  72         {
  73         }
  74
  75     private:
  76         void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override
  77         {
  78             painter->save();
  79             QStyledItemDelegate::paint(painter, option, index); // paints background, focus rect and selection rect
  80
  81             const QStyle *style = option.widget ? option.widget->style() : QApplication::style();
  82             const QRect textRect = option.rect.adjusted(1, 0, 0, 0); // shift 1 to avoid text being too close to focus rect
  83             const bool isEnabled = option.state.testFlag(QStyle::State_Enabled);
  84
  85 #ifdef Q_OS_WIN
  86             // Windows default theme do not use highlighted text color
  87             const QPalette::ColorRole textRole = m_useCustomUITheme
  88                 ? (option.state.testFlag(QStyle::State_Selected) ? QPalette::HighlightedText : QPalette::WindowText)
  89                 : QPalette::WindowText;
  90 #else
  91             const QPalette::ColorRole textRole = option.state.testFlag(QStyle::State_Selected) ? QPalette::HighlightedText : QPalette::WindowText;
  92 #endif
  93
  94             // for unknown reasons (fixme) painter won't accept some font properties
  95             // until they are set explicitly, and we have to manually set some font properties
  96             QFont font = option.font;
  97             font.setFamily(option.font.family());
  98             if (option.font.pointSizeF() > 0) // for better scaling we use floating point version
  99                 font.setPointSizeF(option.font.pointSizeF());
 100             painter->setFont(font);
 101
 102             QPalette palette = option.palette;
 103
 104             const QString time = index.data(BaseLogModel::TimeRole).toString();
 105             palette.setColor(QPalette::Active, QPalette::WindowText, index.data(BaseLogModel::TimeForegroundRole).value<QColor>());
 106             style->drawItemText(painter, textRect, option.displayAlignment, palette, isEnabled, time, textRole);
 107
 108             const QFontMetrics fontMetrics = painter->fontMetrics(); // option.fontMetrics adds extra padding to QFontMetrics::width
 109             const int separatorCoordinateX = horizontalAdvance(fontMetrics, time);
 110             style->drawItemText(painter, textRect.adjusted(separatorCoordinateX, 0, 0, 0), option.displayAlignment, option.palette
 111                                 , isEnabled, SEPARATOR, textRole);
 112
 113             const int messageCoordinateX = separatorCoordinateX + horizontalAdvance(fontMetrics, SEPARATOR);
 114             const QString message = index.data(BaseLogModel::MessageRole).toString();
 115             palette.setColor(QPalette::Active, QPalette::WindowText, index.data(BaseLogModel::MessageForegroundRole).value<QColor>());
 116             style->drawItemText(painter, textRect.adjusted(messageCoordinateX, 0, 0, 0), option.displayAlignment, palette
 117                                 , isEnabled, message, textRole);
 118
 119             painter->restore();
 120         }
 121
 122         QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override
 123         {
 124             const QSize minimumFontPadding(4, 4);
 125             const QSize fontSize = option.fontMetrics.size(0, logText(index)) + minimumFontPadding;
 126             const QSize defaultSize = QStyledItemDelegate::sizeHint(option, index);
 127             const QSize margins = (defaultSize - fontSize).expandedTo({0, 0});
 128             return fontSize + margins;
 129         }
 130
 131 #ifdef Q_OS_WIN
 132         const bool m_useCustomUITheme = false;
 133 #endif
 134     };
 135 }
 136
 137 LogListView::LogListView(QWidget *parent)
 138     : QListView(parent)
 139 {
 140     setSelectionMode(QAbstractItemView::ExtendedSelection);
 141     setItemDelegate(new LogItemDelegate(this));
 142
 143 #ifdef Q_OS_MAC
 144     setAttribute(Qt::WA_MacShowFocusRect, false);
 145 #endif
 146 }
 147
 148 void LogListView::keyPressEvent(QKeyEvent *event)
 149 {
 150     if (event->matches(QKeySequence::Copy))
 151         copySelection();
 152     else
 153         QListView::keyPressEvent(event);
 154 }
 155
 156 void LogListView::copySelection() const
 157 {
 158     QStringList list;
 159     const QModelIndexList selectedIndexes = selectionModel()->selectedRows();
 160     for (const QModelIndex &index : selectedIndexes)
 161         list.append(logText(index));
 162     QApplication::clipboard()->setText(list.join(u'\n'));
 163 }