Add option to tune download history list length. Closes #4043.

src/gui/addnewtorrentdialog.cpp

@@ -38,6 +38,7 @@
 
 #include "base/preferences.h"
 #include "base/settingsstorage.h"
+#include "base/settingvalue.h"
 #include "base/net/downloadmanager.h"
 #include "base/net/downloadhandler.h"
 #include "base/bittorrent/session.h"
@@ -58,6 +59,8 @@
 #include "ui_addnewtorrentdialog.h"
 #include "addnewtorrentdialog.h"
 
+namespace
+{
 #define SETTINGS_KEY(name) "AddNewTorrentDialog/" name
     const QString KEY_ENABLED = SETTINGS_KEY("Enabled");
     const QString KEY_DEFAULTCATEGORY = SETTINGS_KEY("DefaultCategory");
@@ -66,9 +69,8 @@ const QString KEY_WIDTH = SETTINGS_KEY("Width");
     const QString KEY_EXPANDED = SETTINGS_KEY("Expanded");
     const QString KEY_TOPLEVEL = SETTINGS_KEY("TopLevel");
     const QString KEY_SAVEPATHHISTORY = SETTINGS_KEY("SavePathHistory");
+    const char KEY_SAVEPATHHISTORYLENGTH[] = SETTINGS_KEY("SavePathHistoryLength");
 
-namespace
-{
     // just a shortcut
     inline SettingsStorage *settings()
     {
@@ -76,6 +78,9 @@ namespace
     }
 }
 
+constexpr int AddNewTorrentDialog::minPathHistoryLength;
+constexpr int AddNewTorrentDialog::maxPathHistoryLength;
+
 AddNewTorrentDialog::AddNewTorrentDialog(const BitTorrent::AddTorrentParams &inParams, QWidget *parent)
     : QDialog(parent)
     , ui(new Ui::AddNewTorrentDialog)
@@ -93,6 +98,7 @@ AddNewTorrentDialog::AddNewTorrentDialog(const BitTorrent::AddTorrentParams &inP
 
     ui->savePath->setMode(FileSystemPathEdit::Mode::DirectorySave);
     ui->savePath->setDialogCaption(tr("Choose save path"));
+    ui->savePath->setMaxVisibleItems(20);
 
     auto session = BitTorrent::Session::instance();
 
@@ -175,6 +181,34 @@ void AddNewTorrentDialog::setTopLevel(bool value)
     SettingsStorage::instance()->storeValue(KEY_TOPLEVEL, value);
 }
 
+int AddNewTorrentDialog::savePathHistoryLength()
+{
+    return savePathHistoryLengthSetting();
+}
+
+void AddNewTorrentDialog::setSavePathHistoryLength(int value)
+{
+    Q_ASSERT(value >= minPathHistoryLength);
+    Q_ASSERT(value <= maxPathHistoryLength);
+    const int oldValue = savePathHistoryLength();
+    if (oldValue != value) {
+        savePathHistoryLengthSetting() = value;
+        settings()->storeValue(KEY_SAVEPATHHISTORY,
+                               QStringList(settings()->loadValue(KEY_SAVEPATHHISTORY).toStringList().mid(0, value)));
+    }
+}
+
+CachedSettingValue<int> &AddNewTorrentDialog::savePathHistoryLengthSetting()
+{
+    const int defaultHistoryLength = 8;
+    static CachedSettingValue<int> setting(KEY_SAVEPATHHISTORYLENGTH, defaultHistoryLength,
+        [](int v)
+        {
+            return std::max(minPathHistoryLength, std::min(maxPathHistoryLength, v));
+        });
+    return setting;
+}
+
 void AddNewTorrentDialog::loadState()
 {
     m_headerState = settings()->loadValue(KEY_TREEHEADERSTATE).toByteArray();
@@ -362,6 +396,8 @@ void AddNewTorrentDialog::saveSavePathHistory() const
     QDir selectedSavePath(ui->savePath->selectedPath());
     // Get current history
     QStringList history = settings()->loadValue(KEY_SAVEPATHHISTORY).toStringList();
+    if (history.size() > savePathHistoryLength())
+        history = history.mid(0, savePathHistoryLength());
     QList<QDir> historyDirs;
     foreach (const QString dir, history)
         historyDirs << QDir(dir);
@@ -369,7 +405,7 @@ void AddNewTorrentDialog::saveSavePathHistory() const
         // Add save path to history
         history.push_front(selectedSavePath.absolutePath());
         // Limit list size
-        if (history.size() > 8)
+        if (history.size() > savePathHistoryLength())
             history.pop_back();
         // Save history
         settings()->storeValue(KEY_SAVEPATHHISTORY, history);

src/gui/addnewtorrentdialog.h

@@ -53,18 +53,24 @@ namespace Ui
 class TorrentContentFilterModel;
 class TorrentFileGuard;
 class PropListDelegate;
+template <typename T> class CachedSettingValue;
 
 class AddNewTorrentDialog: public QDialog
 {
     Q_OBJECT
 
 public:
+    static constexpr int minPathHistoryLength = 0;
+    static constexpr int maxPathHistoryLength = 99;
+
     ~AddNewTorrentDialog();
 
     static bool isEnabled();
     static void setEnabled(bool value);
     static bool isTopLevel();
     static void setTopLevel(bool value);
+    static int savePathHistoryLength();
+    static void setSavePathHistoryLength(int value);
 
     static void show(QString source, const BitTorrent::AddTorrentParams &inParams, QWidget *parent);
     static void show(QString source, QWidget *parent);
@@ -99,6 +105,7 @@ private:
     void setupTreeview();
     void setCommentText(const QString &str) const;
     void setSavePath(const QString &newPath);
+    static CachedSettingValue<int> &savePathHistoryLengthSetting();
 
     void showEvent(QShowEvent *event) override;
 

src/gui/advancedsettings.cpp

@@ -37,6 +37,7 @@
 #include "base/bittorrent/session.h"
 #include "base/preferences.h"
 #include "base/unicodestrings.h"
+#include "gui/addnewtorrentdialog.h"
 #include "gui/mainwindow.h"
 
 enum AdvSettingsCols
@@ -69,6 +70,7 @@ enum AdvSettingsRows
     TORRENT_ADDED_NOTIFICATIONS,
     CONFIRM_REMOVE_ALL_TAGS,
     DOWNLOAD_TRACKER_FAVICON,
+    SAVE_PATH_HISTORY_LENGTH,
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
     USE_ICON_THEME,
 #endif
@@ -196,6 +198,7 @@ void AdvancedSettings::saveAdvancedSettings()
     mainWindow->setTorrentAddedNotificationsEnabled(cb_torrent_added_notifications.isChecked());
     // Misc GUI properties
     mainWindow->setDownloadTrackerFavicon(cb_tracker_favicon.isChecked());
+    AddNewTorrentDialog::setSavePathHistoryLength(spinSavePathHistoryLength.value());
 
     // Tracker
     session->setTrackerEnabled(cb_tracker_status.isChecked());
@@ -418,7 +421,10 @@ void AdvancedSettings::loadAdvancedSettings()
     // Download tracker's favicon
     cb_tracker_favicon.setChecked(mainWindow->isDownloadTrackerFavicon());
     addRow(DOWNLOAD_TRACKER_FAVICON, tr("Download tracker's favicon"), &cb_tracker_favicon);
-
+    // Save path history length
+    spinSavePathHistoryLength.setRange(AddNewTorrentDialog::minPathHistoryLength, AddNewTorrentDialog::maxPathHistoryLength);
+    spinSavePathHistoryLength.setValue(AddNewTorrentDialog::savePathHistoryLength());
+    addRow(SAVE_PATH_HISTORY_LENGTH, tr("Save path history length"), &spinSavePathHistoryLength);
     // Tracker State
     cb_tracker_status.setChecked(session->isTrackerEnabled());
     addRow(TRACKER_STATUS, tr("Enable embedded tracker"), &cb_tracker_status);

src/gui/advancedsettings.h

@@ -76,7 +76,7 @@ private:
 
     QLabel labelQbtLink, labelLibtorrentLink;
     QSpinBox spin_cache, spin_save_resume_data_interval, outgoing_ports_min, outgoing_ports_max, spin_list_refresh, spin_maxhalfopen, spin_tracker_port, spin_cache_ttl,
-             spinSendBufferWatermark, spinSendBufferLowWatermark, spinSendBufferWatermarkFactor;
+             spinSendBufferWatermark, spinSendBufferLowWatermark, spinSendBufferWatermarkFactor, spinSavePathHistoryLength;
     QCheckBox cb_os_cache, cb_recheck_completed, cb_resolve_countries, cb_resolve_hosts, cb_super_seeding,
               cb_program_notifications, cb_torrent_added_notifications, cb_tracker_favicon, cb_tracker_status,
               cb_confirm_torrent_recheck, cb_confirm_remove_all_tags, cb_listen_ipv6, cb_announce_all_trackers, cbGuidedReadCache, cbMultiConnectionsPerIp,