src/versioncontrol/versioncontrolobserver.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Peter Penz <peter.penz@gmx.at>                  *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "versioncontrolobserver.h"
  21
  22 #include <dolphinmodel.h>
  23 #include "dolphin_versioncontrolsettings.h"
  24
  25 #include <kdirlister.h>
  26 #include <klocale.h>
  27 #include <kservice.h>
  28 #include <kservicetypetrader.h>
  29 #include <kversioncontrolplugin.h>
  30
  31 #include "updateitemstatesthread.h"
  32
  33 #include <QAbstractProxyModel>
  34 #include <QAbstractItemView>
  35 #include <QMutexLocker>
  36 #include <QTimer>
  37
  38 /*
  39  * Maintains a list of pending threads, that get regulary checked
  40  * whether they are finished and hence can get deleted. QThread::wait()
  41  * is never used to prevent any blocking of the user interface.
  42  */
  43 struct PendingThreadsSingleton
  44 {
  45     QList<UpdateItemStatesThread*> list;
  46 };
  47 K_GLOBAL_STATIC(PendingThreadsSingleton, s_pendingThreads)
  48
  49
  50 VersionControlObserver::VersionControlObserver(QAbstractItemView* view) :
  51     QObject(view),
  52     m_pendingItemStatesUpdate(false),
  53     m_versionedDirectory(false),
  54     m_silentUpdate(false),
  55     m_view(view),
  56     m_dirLister(0),
  57     m_dolphinModel(0),
  58     m_dirVerificationTimer(0),
  59     m_plugin(0),
  60     m_updateItemStatesThread(0)
  61 {
  62     Q_ASSERT(view != 0);
  63
  64     QAbstractProxyModel* proxyModel = qobject_cast<QAbstractProxyModel*>(view->model());
  65     m_dolphinModel = (proxyModel == 0) ?
  66                      qobject_cast<DolphinModel*>(view->model()) :
  67                      qobject_cast<DolphinModel*>(proxyModel->sourceModel());
  68     if (m_dolphinModel != 0) {
  69         m_dirLister = m_dolphinModel->dirLister();
  70         connect(m_dirLister, SIGNAL(completed()),
  71                 this, SLOT(delayedDirectoryVerification()));
  72
  73         // The verification timer specifies the timeout until the shown directory
  74         // is checked whether it is versioned. Per default it is assumed that users
  75         // don't iterate through versioned directories and a high timeout is used
  76         // The timeout will be decreased as soon as a versioned directory has been
  77         // found (see verifyDirectory()).
  78         m_dirVerificationTimer = new QTimer(this);
  79         m_dirVerificationTimer->setSingleShot(true);
  80         m_dirVerificationTimer->setInterval(500);
  81         connect(m_dirVerificationTimer, SIGNAL(timeout()),
  82                 this, SLOT(verifyDirectory()));
  83     }
  84 }
  85
  86 VersionControlObserver::~VersionControlObserver()
  87 {
  88     if (m_updateItemStatesThread != 0) {
  89         if (m_updateItemStatesThread->isFinished()) {
  90             delete m_updateItemStatesThread;
  91             m_updateItemStatesThread = 0;
  92         } else {
  93             // The version controller gets deleted, while a thread still
  94             // is working to get the version information. To avoid a blocking
  95             // user interface, no waiting for the finished() signal of the thread is
  96             // done. Instead the thread will be remembered inside the global
  97             // list s_pendingThreads, which will checked regulary. The thread does
  98             // not work on shared data that is part of the VersionController instance,
  99             // so skipping the waiting is save.
 100             disconnect(m_updateItemStatesThread, SIGNAL(finished()),
 101                        this, SLOT(slotThreadFinished()));
 102             s_pendingThreads->list.append(m_updateItemStatesThread);
 103             m_updateItemStatesThread = 0;
 104         }
 105     }
 106
 107     m_plugin->disconnect();
 108     m_plugin = 0;
 109 }
 110
 111 QList<QAction*> VersionControlObserver::contextMenuActions(const KFileItemList& items) const
 112 {
 113     QList<QAction*> actions;
 114     if (isVersioned() && m_updateItemStatesThread->beginReadItemStates()) {
 115         actions = m_plugin->contextMenuActions(items);
 116         m_updateItemStatesThread->endReadItemStates();
 117     }
 118     return actions;
 119 }
 120
 121 QList<QAction*> VersionControlObserver::contextMenuActions(const QString& directory) const
 122 {
 123     QList<QAction*> actions;
 124     if (isVersioned() && m_updateItemStatesThread->beginReadItemStates()) {
 125         actions = m_plugin->contextMenuActions(directory);
 126         m_updateItemStatesThread->endReadItemStates();
 127     }
 128
 129     return actions;
 130 }
 131
 132 void VersionControlObserver::delayedDirectoryVerification()
 133 {
 134     m_silentUpdate = false;
 135     m_dirVerificationTimer->start();
 136 }
 137
 138 void VersionControlObserver::silentDirectoryVerification()
 139 {
 140     m_silentUpdate = true;
 141     m_dirVerificationTimer->start();
 142 }
 143
 144 void VersionControlObserver::verifyDirectory()
 145 {
 146     if (!s_pendingThreads->list.isEmpty()) {
 147         // Try to cleanup pending threads (see explanation in destructor)
 148         QList<UpdateItemStatesThread*>::iterator it = s_pendingThreads->list.begin();
 149         while (it != s_pendingThreads->list.end()) {
 150             if ((*it)->isFinished()) {
 151                 (*it)->deleteLater();
 152                 it = s_pendingThreads->list.erase(it);
 153             } else {
 154                 ++it;
 155             }
 156         }
 157     }
 158
 159     KUrl versionControlUrl = m_dirLister->url();
 160     if (!versionControlUrl.isLocalFile()) {
 161         return;
 162     }
 163
 164     if (m_plugin != 0) {
 165         m_plugin->disconnect();
 166     }
 167
 168     m_plugin = searchPlugin(versionControlUrl);
 169     const bool foundVersionInfo = (m_plugin != 0);
 170     if (!foundVersionInfo && m_versionedDirectory) {
 171         // Version control systems like Git provide the version information
 172         // file only in the root directory. Check whether the version information file can
 173         // be found in one of the parent directories.
 174
 175         // TODO...
 176     }
 177
 178     if (foundVersionInfo) {
 179         if (!m_versionedDirectory) {
 180             m_versionedDirectory = true;
 181
 182             // The directory is versioned. Assume that the user will further browse through
 183             // versioned directories and decrease the verification timer.
 184             m_dirVerificationTimer->setInterval(100);
 185             connect(m_dirLister, SIGNAL(refreshItems(const QList<QPair<KFileItem,KFileItem>>&)),
 186                     this, SLOT(delayedDirectoryVerification()));
 187             connect(m_dirLister, SIGNAL(newItems(const KFileItemList&)),
 188                     this, SLOT(delayedDirectoryVerification()));
 189             connect(m_plugin, SIGNAL(versionStatesChanged()),
 190                     this, SLOT(silentDirectoryVerification()));
 191             connect(m_plugin, SIGNAL(infoMessage(const QString&)),
 192                     this, SIGNAL(infoMessage(const QString&)));
 193             connect(m_plugin, SIGNAL(errorMessage(const QString&)),
 194                     this, SIGNAL(errorMessage(const QString&)));
 195             connect(m_plugin, SIGNAL(operationCompletedMessage(const QString&)),
 196                     this, SIGNAL(operationCompletedMessage(const QString&)));
 197         }
 198         updateItemStates();
 199     } else if (m_versionedDirectory) {
 200         m_versionedDirectory = false;
 201
 202         // The directory is not versioned. Reset the verification timer to a higher
 203         // value, so that browsing through non-versioned directories is not slown down
 204         // by an immediate verification.
 205         m_dirVerificationTimer->setInterval(500);
 206         disconnect(m_dirLister, SIGNAL(refreshItems(const QList<QPair<KFileItem,KFileItem>>&)),
 207                    this, SLOT(delayedDirectoryVerification()));
 208         disconnect(m_dirLister, SIGNAL(newItems(const KFileItemList&)),
 209                    this, SLOT(delayedDirectoryVerification()));
 210     }
 211 }
 212
 213 void VersionControlObserver::slotThreadFinished()
 214 {
 215     if (m_plugin == 0) {
 216         return;
 217     }
 218
 219     if (!m_updateItemStatesThread->retrievedItems()) {
 220         // ignore m_silentUpdate for an error message
 221         emit errorMessage(i18nc("@info:status", "Update of version information failed."));
 222         return;
 223     }
 224
 225     // QAbstractItemModel::setData() triggers a bottleneck in combination with QListView
 226     // (a detailed description of the root cause is given in the class KFilePreviewGenerator
 227     // from kdelibs). To bypass this bottleneck, the signals of the model are temporary blocked.
 228     // This works as the update of the data does not require a relayout of the views used in Dolphin.
 229     const bool signalsBlocked = m_dolphinModel->signalsBlocked();
 230     m_dolphinModel->blockSignals(true);
 231
 232     const QList<ItemState> itemStates = m_updateItemStatesThread->itemStates();
 233     foreach (const ItemState& itemState, itemStates) {
 234         m_dolphinModel->setData(itemState.index,
 235                                 QVariant(static_cast<int>(itemState.version)),
 236                                 Qt::DecorationRole);
 237     }
 238
 239     m_dolphinModel->blockSignals(signalsBlocked);
 240     m_view->viewport()->repaint();
 241
 242     if (!m_silentUpdate) {
 243         // Using an empty message results in clearing the previously shown information message and showing
 244         // the default status bar information. This is useful as the user already gets feedback that the
 245         // operation has been completed because of the icon emblems.
 246         emit operationCompletedMessage(QString());
 247     }
 248
 249     if (m_pendingItemStatesUpdate) {
 250         m_pendingItemStatesUpdate = false;
 251         updateItemStates();
 252     }
 253 }
 254
 255 void VersionControlObserver::updateItemStates()
 256 {
 257     Q_ASSERT(m_plugin != 0);
 258     if (m_updateItemStatesThread == 0) {
 259         m_updateItemStatesThread = new UpdateItemStatesThread();
 260         connect(m_updateItemStatesThread, SIGNAL(finished()),
 261                 this, SLOT(slotThreadFinished()));
 262     }
 263     if (m_updateItemStatesThread->isRunning()) {
 264         // An update is currently ongoing. Wait until the thread has finished
 265         // the update (see slotThreadFinished()).
 266         m_pendingItemStatesUpdate = true;
 267         return;
 268     }
 269
 270     QList<ItemState> itemStates;
 271     addDirectory(QModelIndex(), itemStates);
 272     if (!itemStates.isEmpty()) {
 273         if (!m_silentUpdate) {
 274             emit infoMessage(i18nc("@info:status", "Updating version information..."));
 275         }
 276         m_updateItemStatesThread->setData(m_plugin, itemStates);
 277         m_updateItemStatesThread->start(); // slotThreadFinished() is called when finished
 278     }
 279 }
 280
 281 void VersionControlObserver::addDirectory(const QModelIndex& parentIndex, QList<ItemState>& itemStates)
 282 {
 283     const int rowCount = m_dolphinModel->rowCount(parentIndex);
 284     for (int row = 0; row < rowCount; ++row) {
 285         const QModelIndex index = m_dolphinModel->index(row, DolphinModel::Version, parentIndex);
 286         addDirectory(index, itemStates);
 287
 288         ItemState itemState;
 289         itemState.index = index;
 290         itemState.item = m_dolphinModel->itemForIndex(index);
 291         itemState.version = KVersionControlPlugin::UnversionedVersion;
 292
 293         itemStates.append(itemState);
 294     }
 295 }
 296
 297 KVersionControlPlugin* VersionControlObserver::searchPlugin(const KUrl& directory) const
 298 {
 299     static bool pluginsAvailable = true;
 300     static QList<KVersionControlPlugin*> plugins;
 301
 302     if (!pluginsAvailable) {
 303         // a searching for plugins has already been done, but no
 304         // plugins are installed
 305         return 0;
 306     }
 307
 308     if (plugins.isEmpty()) {
 309         // No searching for plugins has been done yet. Query the KServiceTypeTrader for
 310         // all fileview version control plugins and remember them in 'plugins'.
 311         const QString disabledPlugins = VersionControlSettings::disabledPlugins();
 312         const QStringList disabledPluginsList = disabledPlugins.split(',');
 313
 314         const KService::List pluginServices = KServiceTypeTrader::self()->query("FileViewVersionControlPlugin");
 315         for (KService::List::ConstIterator it = pluginServices.constBegin(); it != pluginServices.constEnd(); ++it) {
 316             if (!disabledPluginsList.contains((*it)->name())) {
 317                 KVersionControlPlugin* plugin = (*it)->createInstance<KVersionControlPlugin>();
 318                 Q_ASSERT(plugin != 0);
 319                 plugins.append(plugin);
 320             }
 321         }
 322         if (plugins.isEmpty()) {
 323             pluginsAvailable = false;
 324             return 0;
 325         }
 326     }
 327
 328     // verify whether the current directory contains revision information
 329     // like .svn, .git, ...
 330     foreach (KVersionControlPlugin* plugin, plugins) {
 331         KUrl fileUrl = directory;
 332         fileUrl.addPath(plugin->fileName());
 333         const KFileItem item = m_dirLister->findByUrl(fileUrl);
 334         if (!item.isNull()) {
 335             return plugin;
 336         }
 337     }
 338
 339     return 0;
 340 }
 341
 342 bool VersionControlObserver::isVersioned() const
 343 {
 344     return m_dolphinModel->hasVersionData() && (m_plugin != 0);
 345 }
 346
 347 #include "versioncontrolobserver.moc"