Remove usage of QTextStream

Other classes already provide rich methods so avoid another
layer of QTextStream which slow things down (slightly).

PR #17180.

src/app/cmdoptions.cpp

@@ -35,7 +35,6 @@
 #include <QDebug>
 #include <QFileInfo>
 #include <QProcessEnvironment>
-#include <QTextStream>
 
 #if defined(Q_OS_WIN) && !defined(DISABLE_GUI)
 #include <QMessageBox>
@@ -525,59 +524,57 @@ QString wrapText(const QString &text, int initialIndentation = USAGE_TEXT_COLUMN
 
 QString makeUsage(const QString &prgName)
 {
-    QString text;
+    const QString indentation {USAGE_INDENTATION, u' '};
-    QTextStream stream(&text, QIODevice::WriteOnly);
-    QString indentation = QString(USAGE_INDENTATION, u' ');
 
-    stream << QObject::tr("Usage:") << '\n'
+    const QString text = QObject::tr("Usage:") + u'\n'
-        << indentation << prgName << u" [options] [(<filename> | <url>)...]"_qs << '\n'
+        + indentation + prgName + u" [options] [(<filename> | <url>)...]" + u'\n'
 
-        << QObject::tr("Options:") << '\n'
+        + QObject::tr("Options:") + u'\n'
 #if !defined(Q_OS_WIN) || defined(DISABLE_GUI)
-        << SHOW_VERSION_OPTION.usage() << wrapText(QObject::tr("Display program version and exit")) << '\n'
+        + SHOW_VERSION_OPTION.usage() + wrapText(QObject::tr("Display program version and exit")) + u'\n'
 #endif
-        << SHOW_HELP_OPTION.usage() << wrapText(QObject::tr("Display this help message and exit")) << '\n'
+        + SHOW_HELP_OPTION.usage() + wrapText(QObject::tr("Display this help message and exit")) + u'\n'
-        << WEBUI_PORT_OPTION.usage(QObject::tr("port"))
+        + WEBUI_PORT_OPTION.usage(QObject::tr("port"))
-        << wrapText(QObject::tr("Change the Web UI port"))
+        + wrapText(QObject::tr("Change the Web UI port"))
-        << '\n'
+        + u'\n'
 #ifndef DISABLE_GUI
-        << NO_SPLASH_OPTION.usage() << wrapText(QObject::tr("Disable splash screen")) << '\n'
+        + NO_SPLASH_OPTION.usage() + wrapText(QObject::tr("Disable splash screen")) + u'\n'
 #elif !defined(Q_OS_WIN)
-        << DAEMON_OPTION.usage() << wrapText(QObject::tr("Run in daemon-mode (background)")) << '\n'
+        + DAEMON_OPTION.usage() + wrapText(QObject::tr("Run in daemon-mode (background)")) + u'\n'
 #endif
     //: Use appropriate short form or abbreviation of "directory"
-        << PROFILE_OPTION.usage(QObject::tr("dir"))
+        + PROFILE_OPTION.usage(QObject::tr("dir"))
-        << wrapText(QObject::tr("Store configuration files in <dir>")) << '\n'
+        + wrapText(QObject::tr("Store configuration files in <dir>")) + u'\n'
-        << CONFIGURATION_OPTION.usage(QObject::tr("name"))
+        + CONFIGURATION_OPTION.usage(QObject::tr("name"))
-        << wrapText(QObject::tr("Store configuration files in directories qBittorrent_<name>")) << '\n'
+        + wrapText(QObject::tr("Store configuration files in directories qBittorrent_<name>")) + u'\n'
-        << RELATIVE_FASTRESUME.usage()
+        + RELATIVE_FASTRESUME.usage()
-        << wrapText(QObject::tr("Hack into libtorrent fastresume files and make file paths relative "
+        + wrapText(QObject::tr("Hack into libtorrent fastresume files and make file paths relative "
-                                "to the profile directory")) << '\n'
+                                "to the profile directory")) + u'\n'
-        << Option::padUsageText(QObject::tr("files or URLs"))
+        + Option::padUsageText(QObject::tr("files or URLs"))
-        << wrapText(QObject::tr("Download the torrents passed by the user")) << '\n'
+        + wrapText(QObject::tr("Download the torrents passed by the user")) + u'\n'
-        << '\n'
+        + u'\n'
-
+
-        << wrapText(QObject::tr("Options when adding new torrents:"), 0) << '\n'
+        + wrapText(QObject::tr("Options when adding new torrents:"), 0) + u'\n'
-        << SAVE_PATH_OPTION.usage(QObject::tr("path")) << wrapText(QObject::tr("Torrent save path")) << '\n'
+        + SAVE_PATH_OPTION.usage(QObject::tr("path")) + wrapText(QObject::tr("Torrent save path")) + u'\n'
-        << PAUSED_OPTION.usage() << wrapText(QObject::tr("Add torrents as started or paused")) << '\n'
+        + PAUSED_OPTION.usage() + wrapText(QObject::tr("Add torrents as started or paused")) + u'\n'
-        << SKIP_HASH_CHECK_OPTION.usage() << wrapText(QObject::tr("Skip hash check")) << '\n'
+        + SKIP_HASH_CHECK_OPTION.usage() + wrapText(QObject::tr("Skip hash check")) + u'\n'
-        << CATEGORY_OPTION.usage(QObject::tr("name"))
+        + CATEGORY_OPTION.usage(QObject::tr("name"))
-        << wrapText(QObject::tr("Assign torrents to category. If the category doesn't exist, it will be "
+        + wrapText(QObject::tr("Assign torrents to category. If the category doesn't exist, it will be "
-                                "created.")) << '\n'
+                                "created.")) + u'\n'
-        << SEQUENTIAL_OPTION.usage() << wrapText(QObject::tr("Download files in sequential order")) << '\n'
+        + SEQUENTIAL_OPTION.usage() + wrapText(QObject::tr("Download files in sequential order")) + u'\n'
-        << FIRST_AND_LAST_OPTION.usage()
+        + FIRST_AND_LAST_OPTION.usage()
-        << wrapText(QObject::tr("Download first and last pieces first")) << '\n'
+        + wrapText(QObject::tr("Download first and last pieces first")) + u'\n'
-        << SKIP_DIALOG_OPTION.usage()
+        + SKIP_DIALOG_OPTION.usage()
-        << wrapText(QObject::tr("Specify whether the \"Add New Torrent\" dialog opens when adding a "
+        + wrapText(QObject::tr("Specify whether the \"Add New Torrent\" dialog opens when adding a "
-                                "torrent.")) << '\n'
+                                "torrent.")) + u'\n'
-        << '\n'
+        + u'\n'
-
+
-        << wrapText(QObject::tr("Option values may be supplied via environment variables. For option named "
+        + wrapText(QObject::tr("Option values may be supplied via environment variables. For option named "
                                 "'parameter-name', environment variable name is 'QBT_PARAMETER_NAME' (in upper "
                                 "case, '-' replaced with '_'). To pass flag values, set the variable to '1' or "
-                                "'TRUE'. For example, to disable the splash screen: "), 0) << "\n"
+                                "'TRUE'. For example, to disable the splash screen: "), 0) + u'\n'
-        << u"QBT_NO_SPLASH=1 "_qs << prgName << '\n'
+        + u"QBT_NO_SPLASH=1 " + prgName + u'\n'
-        << wrapText(QObject::tr("Command line parameters take precedence over environment variables"), 0) << '\n';
+        + wrapText(QObject::tr("Command line parameters take precedence over environment variables"), 0) + u'\n';
 
     return text;
 }

src/base/torrentfileswatcher.cpp

@@ -41,7 +41,6 @@
 #include <QJsonObject>
 #include <QJsonValue>
 #include <QSet>
-#include <QTextStream>
 #include <QThread>
 #include <QTimer>
 #include <QVariant>
@@ -522,9 +521,11 @@ void TorrentFilesWatcher::Worker::processFolder(const Path &path, const Path &wa
             QFile file {filePath.data()};
             if (file.open(QIODevice::ReadOnly | QIODevice::Text))
             {
-                QTextStream str {&file};
+                while (!file.atEnd())
-                while (!str.atEnd())
+                {
-                    emit magnetFound(BitTorrent::MagnetUri(str.readLine()), addTorrentParams);
+                    const auto line = QString::fromLatin1(file.readLine()).trimmed();
+                    emit magnetFound(BitTorrent::MagnetUri(line), addTorrentParams);
+                }
 
                 file.close();
                 Utils::Fs::removeFile(filePath);

src/gui/properties/piecesbar.cpp

@@ -34,7 +34,6 @@
 #include <QHelpEvent>
 #include <QPainter>
 #include <QPainterPath>
-#include <QTextStream>
 #include <QToolTip>
 
 #include "base/bittorrent/torrent.h"
@@ -88,25 +87,29 @@ namespace
     class DetailedTooltipRenderer
     {
     public:
-        DetailedTooltipRenderer(QTextStream &stream, const QString &header)
+        DetailedTooltipRenderer(QString &string, const QString &header)
-            : m_stream(stream)
+            : m_string(string)
         {
-            m_stream << header
+            m_string += header
-                     << R"(<table style="width:100%; padding: 3px; vertical-align: middle;">)";
+                + uR"(<table style="width:100%; padding: 3px; vertical-align: middle;">)";
         }
 
         ~DetailedTooltipRenderer()
         {
-            m_stream << "</table>";
+            m_string += u"</table>";
         }
 
         void operator()(const QString &size, const Path &path)
         {
-            m_stream << R"(<tr><td style="white-space:nowrap">)" << size << "</td><td>" << path.toString() << "</td></tr>";
+            m_string += uR"(<tr><td style="white-space:nowrap">)"
+                + size
+                + u"</td><td>"
+                + path.toString()
+                + u"</td></tr>";
         }
 
     private:
-        QTextStream &m_stream;
+        QString &m_string;
     };
 }
 
@@ -252,17 +255,16 @@ void PiecesBar::showToolTip(const QHelpEvent *e)
         return;
 
     QString toolTipText;
-    QTextStream stream(&toolTipText, QIODevice::WriteOnly);
+
     const bool showDetailedInformation = QApplication::keyboardModifiers().testFlag(Qt::ShiftModifier);
     if (showDetailedInformation && m_torrent->hasMetadata())
     {
         const BitTorrent::TorrentInfo torrentInfo = m_torrent->info();
         const int imagePos = e->pos().x() - borderWidth;
-        if ((imagePos >=0) && (imagePos < m_image.width()))
+        if ((imagePos >= 0) && (imagePos < m_image.width()))
         {
-            stream << "<html><body>";
+            const PieceIndexToImagePos transform {torrentInfo, m_image};
-            PieceIndexToImagePos transform {torrentInfo, m_image};
+            const int pieceIndex = transform.pieceIndex(imagePos);
-            int pieceIndex = transform.pieceIndex(imagePos);
             const QVector<int> files {torrentInfo.fileIndicesForPiece(pieceIndex)};
 
             QString tooltipTitle;
@@ -278,27 +280,28 @@ void PiecesBar::showToolTip(const QHelpEvent *e)
                     tooltipTitle = tr("File in these pieces");
             }
 
-            DetailedTooltipRenderer renderer(stream, tooltipTitle);
+            toolTipText.reserve(files.size() * 128);
+            toolTipText += u"<html><body>";
 
-            for (int f : files)
+            DetailedTooltipRenderer renderer {toolTipText, tooltipTitle};
+
+            for (const int f : files)
             {
                 const Path filePath = torrentInfo.filePath(f);
                 renderer(Utils::Misc::friendlyUnit(torrentInfo.fileSize(f)), filePath);
             }
-            stream << "</body></html>";
+            toolTipText += u"</body></html>";
         }
     }
     else
     {
-        stream << simpleToolTipText();
+        toolTipText += simpleToolTipText();
         if (showDetailedInformation) // metadata are not available at this point
-            stream << '\n' << tr("Wait until metadata become available to see detailed information");
+            toolTipText += u'\n' + tr("Wait until metadata become available to see detailed information");
         else
-            stream << '\n' << tr("Hold Shift key for detailed information");
+            toolTipText += u'\n' + tr("Hold Shift key for detailed information");
     }
 
-    stream.flush();
-
     QToolTip::showText(e->globalPos(), toolTipText, this);
 }
 

src/gui/search/searchwidget.cpp

@@ -46,7 +46,6 @@
 #include <QObject>
 #include <QRegularExpression>
 #include <QShortcut>
-#include <QTextStream>
 #include <QVector>
 
 #include "base/global.h"
@@ -93,22 +92,20 @@ SearchWidget::SearchWidget(MainWindow *mainWindow)
     m_ui->setupUi(this);
     m_ui->tabWidget->tabBar()->installEventFilter(this);
 
-    QString searchPatternHint;
+    const QString searchPatternHint = u"<html><head/><body><p>"
-    QTextStream stream(&searchPatternHint, QIODevice::WriteOnly);
+        + tr("A phrase to search for.") + u"<br>"
-    stream << "<html><head/><body><p>"
+        + tr("Spaces in a search term may be protected by double quotes.")
-           << tr("A phrase to search for.") << "<br>"
+        + u"</p><p>"
-           << tr("Spaces in a search term may be protected by double quotes.")
+        + tr("Example:", "Search phrase example")
-           << "</p><p>"
+        + u"<br>"
-           << tr("Example:", "Search phrase example")
+        + tr("<b>foo bar</b>: search for <b>foo</b> and <b>bar</b>",
-           << "<br>"
-           << tr("<b>foo bar</b>: search for <b>foo</b> and <b>bar</b>",
                  "Search phrase example, illustrates quotes usage, a pair of "
                  "space delimited words, individal words are highlighted")
-           << "<br>"
+        + u"<br>"
-           << tr("<b>&quot;foo bar&quot;</b>: search for <b>foo bar</b>",
+        + tr("<b>&quot;foo bar&quot;</b>: search for <b>foo bar</b>",
                  "Search phrase example, illustrates quotes usage, double quoted"
                  "pair of space delimited words, the whole pair is highlighted")
-           << "</p></body></html>";
+        + u"</p></body></html>";
     m_ui->lineEditSearchPattern->setToolTip(searchPatternHint);
 
 #ifndef Q_OS_MACOS

src/gui/utils.cpp

@@ -42,6 +42,7 @@
 #include <QProcess>
 #include <QRegularExpression>
 #include <QScreen>
+#include <QSize>
 #include <QStyle>
 #include <QThread>
 #include <QUrl>

src/gui/utils.h

@@ -28,13 +28,12 @@
 
 #pragma once
 
-#include <QSize>
-
 #include "base/pathfwd.h"
 
 class QIcon;
 class QPixmap;
 class QPoint;
+class QSize;
 class QWidget;
 
 namespace Utils::Gui